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> Worried about high oil temps?, and/or low oil pressure?
ChrisFoley
post May 28 2014, 05:21 PM
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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.

Attached Image

My newest product is designed to solve this problem.

Attached Image

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. (IMG:style_emoticons/default/smile.gif)
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76-914
post May 28 2014, 06:40 PM
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Another great product Chris. (IMG:style_emoticons/default/piratenanner.gif)
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57lincolnman
post May 28 2014, 07:55 PM
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QUOTE(76-914 @ May 28 2014, 04:40 PM) *

Another great product Chris. (IMG:style_emoticons/default/piratenanner.gif)


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.
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rudedude
post May 28 2014, 08:03 PM
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Let me know when they hit the market.
Jule
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Black22
post May 28 2014, 08:52 PM
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What, if any, modifications are required for installation? Can it be done to an assembled engine or installed block?

Way to go Chris! (IMG:style_emoticons/default/aktion035.gif)
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brant
post May 28 2014, 08:54 PM
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good one...
interested in one for from the when they hit the market

I'll pm you... curious about a detail
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r_towle
post May 28 2014, 08:58 PM
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Cool, I am in.
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Ferg
post May 28 2014, 09:13 PM
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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
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ChrisFoley
post May 28 2014, 10:39 PM
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QUOTE(Black22 @ May 28 2014, 09:52 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.
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boxsterfan
post May 28 2014, 10:48 PM
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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).

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aircooledtechguy
post May 28 2014, 10:55 PM
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Wow!! I'm in for at least 1. Maybe 3. Is it too early for an approximate cost projection??
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ChrisFoley
post May 28 2014, 11:22 PM
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QUOTE(boxsterfan @ May 28 2014, 11:48 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).

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.
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Mike Bellis
post May 28 2014, 11:25 PM
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Very Cool!!!

I don't even own a T4...
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Black22
post May 29 2014, 12:05 AM
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QUOTE(Racer Chris @ May 28 2014, 09:39 PM) *

QUOTE(Black22 @ May 28 2014, 09:52 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.


Wow! Great!
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euro911
post May 29 2014, 12:15 AM
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(IMG:style_emoticons/default/popcorn[1].gif)
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0396
post May 29 2014, 04:21 AM
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I'm in for one when production starts up.

Thanks
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Rleog
post May 29 2014, 05:30 AM
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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 (IMG:style_emoticons/default/beer3.gif) to the creative, talented crew at Tangerine, great people.
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Krieger
post May 29 2014, 07:46 AM
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So, are there any negatives for flowing oil through the cooler all the time, or is that what is supposed to happen?
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CMONNETT
post May 29 2014, 12:16 PM
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I'll take two when you get these going.

Thanks,
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ChrisFoley
post May 29 2014, 12:22 PM
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QUOTE(Krieger @ May 29 2014, 08:46 AM) *

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.
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