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914World.com _ 914World Garage _ Worried about high oil temps?
Posted by: Racer Chris May 28 2014, 05:21 PM
A combination of high oil temp and low pressure seems to plague lots of 914 owners.
Engine modifications for more power often exacerbate the problem.
Discussions frequently circle around the function of the primary pressure relief built into the crankcase near the oil filter.
One member described how he reamed the bore and made a new piston, which seems to have solved his low pressure.
I milled away a portion of a crankcase to have a better look inside the pressure relief circuit. What I found was significant wear, and evidence that the pressure relief was allowing oil to bypass the cooler most of the time.
My newest product is designed to solve this problem.
This little cylinder replaces the stock pressure relief piston and spring in the crankcase.
Primarily what it does is eliminate the oil cooler bypass so the oil goes thru the cooler all the time.
The precisely machined assembly will only allow oil above the preset peak pressure to bypass directly to the sump.
It's also easy to change the max pressure by altering the piston length.
Three prototypes have been made for testing.
We installed the first one in a customer's 2.5L street/track car this afternoon.
In the short time we ran the engine, improved oil pressure was immediately evident.
Further tests will be done to see the effect on oil temp, but we aren't having hot weather here yet.
The other two prototypes are being sent to people in warmer climates with competition cars, ready to put them to the test.
I expect the benefit to be quickly apparent. 
Posted by: 76-914 May 28 2014, 06:40 PM
Another great product Chris. 
Posted by: 57lincolnman May 28 2014, 07:55 PM
Another great product Chris.
We're having consistent 90 degree days down here in Atlanta. If you want to test the prototype here let me know. Looks very interesting.
Posted by: rudedude May 28 2014, 08:03 PM
Let me know when they hit the market.
Jule
Posted by: Black22 May 28 2014, 08:52 PM
What, if any, modifications are required for installation? Can it be done to an assembled engine or installed block?
Way to go Chris! 
Posted by: brant May 28 2014, 08:54 PM
good one...
interested in one for from the when they hit the market
I'll pm you... curious about a detail
Posted by: r_towle May 28 2014, 08:58 PM
Cool, I am in.
Posted by: Ferg May 28 2014, 09:13 PM
I am in.
I will also volunteer I have a bone stock 2.0 with about 800 miles on a crank up rebuild. I have a ir thermometer ect
Posted by: Racer Chris May 28 2014, 10:39 PM
What, if any, modifications are required for installation? Can it be done to an assembled engine or installed block?
Installation takes only a few minutes.
No modification of anything is required.
The hardest part will be loosening the cover.
Be prepared for about a tablespoon of oil to come out.
Posted by: boxsterfan May 28 2014, 10:48 PM
I would be very interested is this works well. Are you waiting for it to "prove" itself on a few test cases before making more?
Besides getting rid of the spring, any difference between this and the Weltmeister Oil Pressure Booster Kit? Easier install for sure as you don't have to mess around cutting the spring.
The whole oil pressure relief setup is the last thing on my list to get "fixed" to help my oil temps (without going external cooler).
Posted by: aircooledtechguy May 28 2014, 10:55 PM
Wow!! I'm in for at least 1. Maybe 3. Is it too early for an approximate cost projection??
Posted by: Racer Chris May 28 2014, 11:22 PM
I would be very interested is this works well. Are you waiting for it to "prove" itself on a few test cases before making more?
Besides getting rid of the spring, any difference between this and the Weltmeister Oil Pressure Booster Kit? Easier install for sure as you don't have to mess around cutting the spring.
The whole oil pressure relief setup is the last thing on my list to get "fixed" to help my oil temps (without going external cooler).
I want some operating data before starting a production run.
They may be available as soon as July.
The Weltmeister kit still allows oil to bypass the cooler at relatively low oil pressures, and it doesn't solve the problem of wear inside the aluminum piston bore causing lower operating pressures across the entire rpm range.
My assembly completely blocks the cooler bypass circuit, and is designed to stop leakage past the piston.
Since the sleeve is steel, it will wear much more slowly.
Preliminary cost projection is around $75.
Posted by: Mike Bellis May 28 2014, 11:25 PM
Very Cool!!!
I don't even own a T4...
Posted by: Black22 May 29 2014, 12:05 AM
What, if any, modifications are required for installation? Can it be done to an assembled engine or installed block?
Installation takes only a few minutes.
No modification of anything is required.
The hardest part will be loosening the cover.
Be prepared for about a tablespoon of oil to come out.
Wow! Great!
Posted by: euro911 May 29 2014, 12:15 AM
![popcorn[1].gif](style_emoticons/default/popcorn[1].gif)
Posted by: 396 May 29 2014, 04:21 AM
I'm in for one when production starts up.
Thanks
Posted by: Rleog May 29 2014, 05:30 AM
It's not proven yet; there's not much data yet, but there are likely more than a few really talented people saying, "Why didn't I think of that."
Here's a tip of that dark stout 
to the creative, talented crew at Tangerine, great people.
Posted by: Krieger May 29 2014, 07:46 AM
So, are there any negatives for flowing oil through the cooler all the time, or is that what is supposed to happen?
Posted by: CMONNETT May 29 2014, 12:16 PM
I'll take two when you get these going.
Thanks,
Posted by: Racer Chris May 29 2014, 12:22 PM
So, are there any negatives for flowing oil through the cooler all the time, or is that what is supposed to happen?
The only negative would be if your oil doesn't get to a good operating temperature.
Actually, the stock system allows some oil through the cooler even when the bypass is open.
The stock system is essentially a viscosity based thermostat.
I think today's oils behave differently than what was in use back in the '70s
so the same arrangement doesn't work so well anymore.
Posted by: ThePaintedMan May 29 2014, 12:44 PM
No problems so far with mine but count me in for one too Chris. Great work as usual.
Posted by: Java2570 May 29 2014, 03:02 PM
Chris - count me in for one as well.
Posted by: 75porsche914 May 29 2014, 03:03 PM
No problems so far with mine but count me in for one too Chris. Great work as usual.
I'm very interested, put me on the future buy list.
I've bored my 2.0 to a 2.4, currently using an external oil cooler and fan that's positioned under my rear right trunk area. So far so good but she always run hot before adding.
Posted by: lonewolfe May 29 2014, 03:51 PM
Perfect timing as I've been prepping a case for an engine build. I'll take one for sure after all the testing is done!
Posted by: hedfurst May 29 2014, 03:55 PM
Wow. This is timely. I think that this is exactly what's going on with the motor in my 912E.
I'll take 2 Chris.
Posted by: Mblizzard May 29 2014, 07:19 PM
I am in as well. Chris has some great stuff!
Posted by: Jetsetsurfshop May 31 2014, 11:17 AM
Looking forward to seeing the testing first hand.
Posted by: HarveyH May 31 2014, 11:27 AM
Interested!
Harvey
Posted by: crash914 May 31 2014, 11:40 AM
How about a full flow system with an external cooler?
would this raise the pressure?
Posted by: MrHyde May 31 2014, 03:50 PM
Makes sense.. sounds like a great invention.. can't wait to see the the results.
Posted by: Dr Evil May 31 2014, 04:57 PM
Is there a concern of a cooler or cooler seal blow out with colder, more viscous oil being shunted directly through/to the cooler? I love the concept 
Posted by: Racer Chris Jun 1 2014, 10:31 PM
Is there a concern of a cooler or cooler seal blow out with colder, more viscous oil being shunted directly through/to the cooler? I love the concept
There's no change in pressure to the cooler when the bypass opens/closes.
The oil simply follows the path of least resistance.
Posted by: Dr Evil Jun 1 2014, 10:39 PM
Cool, thanks for the reply. I figured a smart guy like you thought of this
Posted by: stugray Jun 1 2014, 11:21 PM
Very interesting. I saw your brainstorming in the paddock.
It's also easy to change the max pressure by altering the piston length.
Or a couple of shims under the spring and above that screw....
Posted by: zig-n-zag Jun 2 2014, 03:30 PM
Nice, I would be interested in 2 if it works out.
Any chance of it also working in a type 1 case?
Posted by: worn Jun 2 2014, 05:29 PM
A combination of high oil temp and low pressure seems to plague lots of 914 owners.
Engine modifications for more power often exacerbate the problem.
Discussions frequently circle around the function of the primary pressure relief built into the crankcase near the oil filter.
One member described how he reamed the bore and made a new piston, which seems to have solved his low pressure.
I milled away a portion of a crankcase to have a better look inside the pressure relief circuit. What I found was significant wear, and evidence that the pressure relief was allowing oil to bypass the cooler most of the time.
I expect the benefit to be quickly apparent.
Yeah, I had more than a bit of skepticism in my quest...
http://www.914world.com/bbs2/index.php?showtopic=210207&hl=
This is a great Idea. In my scoping into the hole I didn't see a lot of precision in the bores, which seemed surprising given how everything else seems pretty durn precise.
I have used the MPS diaphragms and they are super, so I bet this will be a real winner. Great work Chris!
Posted by: type2man Jun 2 2014, 06:33 PM
I've been having oil pressure issues in a fresh engine I built where the light starts flickering after about 45 mins of driving while using 10w-40 oil. I took apart a few cases i had laying around and I found there are two different size pistons and springs. I had searched on here for these items but I couldnt find anything. Here are the pics of the two different sizes
Does anyone know why there are two different sizes?
I'd like to try Foley's item to see if it cures my problem
Posted by: Racer Chris Jun 2 2014, 06:49 PM
I saw that short piston for the first time recently.
It came out of a bus engine case which is still at my shop.
Ed (ejm)) said that it would have had hydro lifters.
It had a fairly low operating pressure, and now that the new assembly is installed, I think it had a lot of "blowby".
Posted by: hedfurst Jun 5 2014, 05:32 PM
I have a large type one melling in my car and have always had GREAT oil pressure. Using a 911 gauge have had 55-60 psi when hot at cruising speeds, 32-3600 rpm. Mysteriously on occasion it would 'stick' at something less than 45psi/3barr, no matter what the revs-and run higher oil temps.
Now it's doing it all the time. I run 10w40 in winter and recently changed to my summer grade. With new oil&filter it still says 45 psi hot or cold.
I'm sure that this is the fix I need.
Posted by: Jetsetsurfshop Jun 8 2014, 04:50 AM
A combination of high oil temp and low pressure seems to plague lots of 914 owners.
Engine modifications for more power often exacerbate the problem.
Discussions frequently circle around the function of the primary pressure relief built into the crankcase near the oil filter.
One member described how he reamed the bore and made a new piston, which seems to have solved his low pressure.
I milled away a portion of a crankcase to have a better look inside the pressure relief circuit. What I found was significant wear, and evidence that the pressure relief was allowing oil to bypass the cooler most of the time.
My newest product is designed to solve this problem.
This little cylinder replaces the stock pressure relief piston and spring in the crankcase.
Primarily what it does is eliminate the oil cooler bypass so the oil goes thru the cooler all the time.
The precisely machined assembly will only allow oil above the preset peak pressure to bypass directly to the sump.
It's also easy to change the max pressure by altering the piston length.
Three prototypes have been made for testing.
We installed the first one in a customer's 2.5L street/track car this afternoon.
In the short time we ran the engine, improved oil pressure was immediately evident.
Further tests will be done to see the effect on oil temp, but we aren't having hot weather here yet.
The other two prototypes are being sent to people in warmer climates with competition cars, ready to put them to the test.
I expect the benefit to be quickly apparent.
Testing day at Sebring. It going to be a scorcher.
Posted by: boxsterfan Jun 8 2014, 09:53 PM
Testing day at Sebring. It going to be a scorcher.
How'd it go?
Posted by: Jetsetsurfshop Jun 12 2014, 09:42 AM
Testing day at Sebring. It going to be a scorcher.
How'd it go?
Check this link from the paddock. Seabird had oil pressure issues before getting to test it out properly.
http://www.914world.com/bbs2/index.php?showtopic=236133
Posted by: BritCarJim Jun 12 2014, 09:24 PM
hmm. sign me up too if it works out...
Posted by: Racer Chris Jun 23 2014, 10:07 AM
I talked with Seabird on the phone this morning.
He was at the track again last weekend.
The oil pressure problem related to new Accusump installation was cured.
His data indicated that oil pressures and temps stayed within the desired parameters through two on-track sessions on a hot Florida day.
I'm starting production of the pressure relief assemblies this week.
Price is $74.95, delivered.
They won't be on the website right away but I've provided a shopping cart button in my http://www.914world.com/bbs2/index.php?showtopic=143817 thread in the Member Vendor forum.
Posted by: Mikey914 Jun 23 2014, 10:23 AM
Just ordered, I have 2 cars that can benefit form this.
Thanks
Posted by: Java2570 Jun 23 2014, 10:30 AM
Chris - I just ordered one! Thanks!! Jon
Posted by: ww914 Jun 23 2014, 10:51 AM
I talked with Seabird on the phone this morning.
He was at the track again last weekend.
The oil pressure problem related to new Accusump installation was cured.
His data indicated that oil pressures and temps stayed within the desired parameters through two on-track sessions on a hot Florida day.
I'm starting production of the pressure relief assemblies this week.
Price is $74.95, delivered.
They won't be on the website right away but I've provided a shopping cart button in my http://www.914world.com/bbs2/index.php?showtopic=143817 thread in the Member Vendor forum.
What are the "desired parameters"?
Posted by: stugray Jun 23 2014, 11:16 AM
Chris,
Does this completely eliminate the high pressure bypass for the oil cooler, or just require high(er) pressure before bypass?
I have witnessed one blown oil cooler at the track due to low temps and too high of revs too soon after startup.
Posted by: Racer Chris Jun 23 2014, 11:31 AM
Chris,
Does this completely eliminate the high pressure bypass for the oil cooler, or just require high(er) pressure before bypass?
I have witnessed one blown oil cooler at the track due to low temps and too high of revs too soon after startup.
Stu,
The stock relief circuit doesn't ever prevent full pressure to the cooler.
It simply allows oil to take a shorter path when the pressure is high.
My assembly completely eliminates the cooler bypass, and increases the pressure where excess oil is bypassed directly to the sump.
Posted by: lonewolfe Jun 23 2014, 01:17 PM
Chris! Thanks for the tip for removing the 12 pt socket from the side of the case with a 3/8" extension! That worked perfectly. Now, speaking of that valve, will it still be needed with this new modification?
Posted by: Mblizzard Jun 23 2014, 01:24 PM
Chris,
I am running an external oil coller with a sandwhich plate oil filter adaptor. Will this result in more oil taking the external oil cooler pathway?
Posted by: Racer Chris Jun 23 2014, 01:56 PM
Chris! Thanks for the tip for removing the 12 pt socket from the side of the case with a 3/8" extension! That worked perfectly. Now, speaking of that valve, will it still be needed with this new modification?
I've been running my race engines with the secondary relief blocked off completely.
Since many engines were produced without it, I tend to think it isn't really necessary.
Posted by: Racer Chris Jun 23 2014, 02:07 PM
Chris,
I am running an external oil coller with a sandwhich plate oil filter adaptor. Will this result in more oil taking the external oil cooler pathway?
It won't have any effect on oil flow to an external cooler through a sandwich plate.
Posted by: monkeyboy Jun 23 2014, 03:04 PM
Would this be a beneficial add to a stock motor internally?
Posted by: Racer Chris Jun 23 2014, 03:15 PM
Would this be a beneficial add to a stock motor internally?
If you are experiencing high oil temps/low oil pressures - yes.
Posted by: jim_hoyland Jun 23 2014, 06:02 PM
Chris,
I couldn't find the place to submit an order.... 
Posted by: Vacca Rabite Jun 23 2014, 06:52 PM
Ordered one.
I think my car has (or has had) just about one of everything Chris makes except the exhaust.
Zach
Posted by: Mblizzard Jun 23 2014, 07:13 PM
Ordered one.
I think my car has (or has had) just about one of everything Chris makes except the exhaust.
Zach
Nothing but quality stuff from Chris. It is a love hate relationship. Love the stuff but hate you can't buy every part he makes!
Posted by: jim_hoyland Jun 23 2014, 07:26 PM
found the link and submitted order.
Posted by: HarveyH Jun 24 2014, 12:23 PM
Showing my ignorance here, I try and not spend a lot of time under the car:
Can the install be done with the engine in the car? From pictures I've found the valve seems to be to the right of, and pretty much even with the lower edge of the oil pump. Is there room to swing a ratchet wrench and remove/install the mechanism without fouling the bodywork or something?
Thanks,
Harvey
Posted by: CMONNETT Jun 24 2014, 12:58 PM
Just ordered mine, thanks again for the great products Chris.
Posted by: Racer Chris Jun 24 2014, 01:46 PM
Showing my ignorance here, I try and not spend a lot of time under the car:
Can the install be done with the engine in the car? From pictures I've found the valve seems to be to the right of, and pretty much even with the lower edge of the oil pump. Is there room to swing a ratchet wrench and remove/install the mechanism without fouling the bodywork or something?
Thanks,
Harvey
Its an easy install with the car on jackstands - as long as you can get a big-ass flat-blade screwdriver on the cover.
Probably takes 15 minutes, including jacking up the car.
I'll be photographing an install later this week.
Posted by: HarveyH Jun 24 2014, 03:02 PM
Thanks! Order placed.
I don't know about the 15 minutes though....
Posted by: Racer Chris Jun 24 2014, 07:06 PM
I guess if you haven't dusted off the jackstands in a while it could take some time. 
Posted by: hedfurst Jun 25 2014, 12:36 PM
Excellent!
Posted by: Racer Chris Jun 25 2014, 01:16 PM
Excellent!
My machinist is doing a pilot run of 20 sleeves right now - you're #17.
I hope to start shipping assemblies tomorrow.
Posted by: craig downs Jun 25 2014, 07:42 PM
Just ordered mine.
Posted by: boxsterfan Jun 27 2014, 08:17 AM
I'm looking forward to people's results! Great innovation!!
Posted by: lonewolfe Jun 28 2014, 05:36 AM
I just placed an order for one! Can't wait to get the motor all together and put it to the test. I sure I'll be happy with the results!
Posted by: HarveyH Jun 30 2014, 12:37 PM
Received today, included instructions seem very clear. Thanks.
Looking at the parts breakdown it appears there is a copper crush washer on the cover screw. I would think this is something that should be replaced when reseating the cover. Just go to the local FLAPS and match up a new one or ?????
Thanks again,
Harvey
Posted by: Racer Chris Jun 30 2014, 12:55 PM
Received today, included instructions seem very clear. Thanks.
Looking at the parts breakdown it appears there is a copper crush washer on the cover screw. I would think this is something that should be replaced when reseating the cover. Just go to the local FLAPS and match up a new one or ?????
Thanks again,
Harvey
Most of the crush washers are aluminum.
We re-use them several times without encountering leakage problems.
You may not find one that fits at your FLAPS.
I think the first 3 were shipped before I had the instructions ready.
Anyone who didn't get them, just email me and I'll send electronically.
Posted by: Vacca Rabite Jun 30 2014, 04:23 PM
Mine showed up today.
:-)
Zach
Posted by: Krieger Jul 27 2014, 12:44 PM
I have been wondering how this worked for you guys?
Posted by: majkos Jul 27 2014, 04:20 PM
wellllllllllllllll
I've been dying to get out and drive after I installed it,
EASIEST INSTALL EV, ER!!
I need to get tires on "Beauty" to test,
I have having problems when after ? 30-45 minutes?
temp. would race up to 260-270-280- no prob. 
??
I've been pondering the problem for the last few years, Why?
I'm confident, Chris got it!
Posted by: MrHyde Jul 28 2014, 10:10 AM
Installed mine 2 weekends ago now.. immediately the hot oil pressure drop was fixed. Oil is running cooler too. Took me about half an hour to put in.. Not rushing and having a beverage while working away. I re-used the aluminum crush washer with no leakage issues. Great job Chris. !
Posted by: boxsterfan Aug 21 2014, 07:10 PM
Any more people put in Chris's relief valve?
How are your oil temps?
Posted by: mapguy Aug 21 2014, 09:59 PM
Posted by: majkos Aug 22 2014, 08:09 AM
so far, it's been an interesting experience for me to observe.
I notice a few different things.
Now I've done plenty of oil changes in a 914,
since 1985.
Green Machine My first and still own, 914.
Install EZ, thanks Chris!
I checked the old oil relief SS plug,
It has nasty scoured scratches on it.
Hmmmmmm.
Now I add oil.
Put in what I thought was correct amount,
I've almost a quart over??
well I'm excited to get the engine running,
I can drain it later.
Start her up 70-73 lbs of oil pressure.
Normal.
I let her run for an hour, checking everything,
(Beauty is up on jacks)
Temp. finally gets near 180.
Good enough for me!
And oil pressure is at 40 Lbs! at 1200 RPM idle.
Is this ok?, I'm happy with it.
Now the weird part,
I go drain some oil to get it down to ,what I thought was the proper level,
being under the 914, guessamating about a half quart.
check oil level, no change.
Dang, so I say myself, drain a lot and you can always put it back.
No prob. drain about a quart and some.
Oil level perfect, I have been adding an extra 1/2 qt.
So I go about so with fresh drain, what I thought was fresh oil,
It was BLACK!
I go to strain it thru paper towel (took FOREVER)
nothing,
Well I didn't reuse the oil,
but I think what Beauty has been suffering thru,
was the plug was stuck in cold position, sorta closed off the cooler,
allowing the soots of hot burnt oil build up in the cooler,
as less flow, easy deposit?
I'm not complaining,
I cannot wait to get it on the road for Road test temp.check.
But I'm very busy with work,up till end of year.
Posted by: majkos Aug 22 2014, 09:12 AM
Oil
Posted by: majkos Aug 22 2014, 09:16 AM
SS Plug/valve
Posted by: tumamilhem Aug 27 2014, 08:12 AM
I have a stock 74 2.0 and am in FL. It's close to 100 degrees right now and have been considering adding a second oil cooler to my car. Let me know
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