 too much oil pressure?, high OT on the freeway |
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| VaccaRabite |
 May 17 2010, 08:57 AM
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En Garde!  Group: Admin Posts: 13,752 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region 
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My 2056 is getting elevated oil temps on the freeway. I am using a high volume pump, and seeing about 40 pounds of pressure on the freeway when my oil is up to temp.
What I think is happening is that there is too much pressure, and the oil is not being pumped through the oil cooler due to the check valve closing the passage. However, this is just a guess, as I don't have any way to test it. All I know is that when I am driving at revs, oil temp goes up and if I keep driving at higher revs the oil temps stay up). if I drop revs, oil temps fall back into place, but I can't do that on the freeway without building a lot of head heat. Before I go through the trouble and expense of adding an oil cooler, I want to make sure that I have checked out the simple fixes first. What do I do to make sure oil if going through the oil cooler? What is the point where pressure cuts off passage through the cooler? All tin is in place, and fan housing flaps divert air over the oil cooler 100% of the time (no thermostat in place, so the flaps are always set to cool). Zach |
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| HAM Inc |
May 17 2010, 11:54 AM
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Senior Member Group: Members Posts: 850 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
You need to keep in mind that all of the oil does run through the cooler before it hits the bypass valve.
Tight piston clearances will cause high oil temps. |
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| jhadler |
May 17 2010, 12:53 PM
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#3
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Long term tinkerer... Group: Members Posts: 1,879 Joined: 7-April 03 From: Lyons, CO Member No.: 529 |
QUOTE(HAM Inc @ May 17 2010, 09:54 AM)  ...Tight piston clearances will cause high oil temps. Thanks! I guess I kinda knew that in the back of my head, but seeing it written but one who knows has reminded me again to look at everything on my few hours old rebuild that was running way too hot. Haven't had the time to finish the full tear down as work and family obligations have priority. But I've now got a clean bench in the garage, and will start going over it in detail. Just to ask the question... What is the mechanism for the high oil temps with tight pistons. Is it just ring-wall friction wear that causes it? Or something else? I found out later on that the builder claimed to have needed to "hammer" the pistons into the cylinders... Might be my culprit... Sorry for the hijack.... -Josh2 |
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Posts in this topic
Vacca Rabite too much oil pressure? May 17 2010, 08:57 AM
r_towle Interesting issue.
I dont know the pressure cut o... May 17 2010, 09:00 AM Vacca Rabite Yep, the little flaps are in place.
And I should m... May 17 2010, 09:03 AM r_towle I have always seen high oil temps at 65 mph up to ... May 17 2010, 09:06 AM
Vacca Rabite
We used a simple sandwich adapter and a 2*10 inch... May 17 2010, 09:11 AM
mightyohm
We used a simple sandwich adapter and a 2*10 inch... May 17 2010, 11:37 AM underthetire I get 40 PSI at 210 deg on the Fwy as well. Fought... May 17 2010, 09:13 AM Vacca Rabite
Heater flappers and loose tin. Mine did a huge dr... May 17 2010, 09:19 AM Spoke
I could try blocking the vents at the bottom of t... May 17 2010, 02:06 PM jhadler I forgot who originally mentioned the cavitation i... May 17 2010, 02:32 PM Lennies914 Zach,
I had this exact discussion with BDStone at ... May 17 2010, 09:14 AM r_towle I recall that either aircooled.net, cbperformance,... May 17 2010, 09:18 AM Vacca Rabite My timing right now is at 28.5* Checked it two we... May 17 2010, 09:22 AM realred914 these cars ran hot even stock (hence the factory a... May 17 2010, 09:47 AM 70_914
I would certainly run a thrmostate bellows. it ... May 17 2010, 11:30 AM Vacca Rabite
I would certainly run a thrmostate bellows. it... May 17 2010, 11:42 AM Vacca Rabite Thanks RealRed.
I have a Dakota Digital Head Temp... May 17 2010, 09:55 AM yeahmag Got an O2 on the car? If not might want to get one... May 17 2010, 10:29 AM detoxcowboy "I recall that either aircooled.net, cbperfor... May 17 2010, 10:36 AM Jake Raby 40 PSI is perfect on the highway, its not high eno... May 17 2010, 11:24 AM Vacca Rabite
40 PSI is perfect on the highway, its not high en... May 17 2010, 11:36 AM yeahmag I haven't gotten a solid answer on this, but I... May 17 2010, 11:43 AM Vacca Rabite
You need to keep in mind that all of the oil does... May 17 2010, 12:14 PM tradisrad I'm curious how high oil pressure makes the oi... May 17 2010, 11:57 AM DanT When I built my 2056 I did away with the thermosta... May 17 2010, 12:20 PM realred914
When I built my 2056 I did away with the thermost... May 18 2010, 09:30 AM HAM Inc Zach the pressure bypass drops the pressure in the... May 17 2010, 12:31 PM Vacca Rabite Okay. Bear with me, as I am just thinking through... May 17 2010, 12:39 PM mightyohm What oil temps are you actually seeing? May 17 2010, 12:52 PM Vacca Rabite
What oil temps are you actually seeing?
235-245 ... May 17 2010, 12:54 PM Spoke I thought cavitation was in respect to closing off... May 17 2010, 03:00 PM underthetire Wouldn't blocking them off be the same as if y... May 17 2010, 03:45 PM HAM Inc
The stiffer the spring the higher the oil pressur... May 17 2010, 04:37 PM Vacca Rabite [quote name='HAM Inc' date='May 17 201... May 17 2010, 07:55 PM AndrewP Do you know if your oil temp gauge is accurate?
A... May 17 2010, 05:32 PM r_towle Do you think your header might be adding heat to t... May 17 2010, 06:47 PM r_towle I had a decent idea for your header leak issue.
C... May 17 2010, 08:14 PM HAM Inc
Zach that is propbably in the 10lbs/1000rpm... May 18 2010, 07:53 AM Vacca Rabite
What is the history of your O.E. cooler?
Came w... May 18 2010, 08:09 AM r_towle
What is the history of your O.E. cooler?
Came ... May 18 2010, 05:42 PM Racer Chris I drive like a bat out of hell, pretty much all th... May 18 2010, 11:06 AM yeahmag Damn... So what's your secret? May 18 2010, 11:08 AM Borderline Zach, I haven't had the opportunity to verify ... May 18 2010, 11:23 AM Elliot Cannon Start your car and put your hand down by the vents... May 18 2010, 12:25 PM realred914
Start your car and put your hand down by the vent... May 18 2010, 01:53 PM Cevan
Start your car and put your hand down by the ven... May 18 2010, 02:27 PM Elliot Cannon I got rid of the Home Depot scoop :barf: and made... May 18 2010, 12:27 PM Cap'n Krusty Having seen the devastating effects of CV bolt fai... May 18 2010, 01:37 PM Elliot Cannon
Having seen the devastating effects of CV bolt fa... May 18 2010, 01:53 PM markb
however if I heard the noise of a broken cv and a... May 18 2010, 02:59 PM Bleyseng yeah, it will be fine. May 18 2010, 02:32 PM yeahmag I think too retarded makes heat too... At least th... May 18 2010, 05:44 PM 70_914 Too much oil pressure could cause excess heat beca... May 18 2010, 07:03 PM Chris Hamilton
Too much oil pressure could cause excess heat bec... May 18 2010, 07:40 PM 70_914
Too much oil pressure could cause excess heat be... May 18 2010, 11:24 PM realred914
Too much oil pressure could cause excess heat bec... May 19 2010, 08:26 AM 70_914
Too much oil pressure could cause excess heat be... May 19 2010, 08:30 AM Jake Raby Thats my least favorite exhaust... For many reason... May 18 2010, 07:19 PM 70_914 Here is some information:
http://www.machinerylubr... May 18 2010, 11:33 PM Chris Hamilton Could you point out what part of your links apply ... May 19 2010, 01:00 AM 70_914 Sorry to hijack the thread discussing basic thermo... May 19 2010, 08:24 AM 70_914 GO VIKINGS! WWU is in Bellingham and has an o... May 19 2010, 08:31 AM realred914
Sorry to hijack the thread discussing basic therm... May 19 2010, 08:35 AM Chris Hamilton If you wanted Example A to apply to this situation... May 19 2010, 12:46 PM Racer Chris
but the bottom line is that oil pressure is not ... May 19 2010, 04:12 PM 70_914
but the bottom line is that oil pressure is not... May 19 2010, 04:47 PM Racer Chris Higher pressure from a high volume pump isn't ... May 19 2010, 04:10 PM Vacca Rabite So, coming back down from high science to backyard... May 20 2010, 09:02 AM jhadler
So, coming back down from high science to backyar... May 20 2010, 09:29 AM type11969 Spin on type, drops the filter about an inch, no c... May 20 2010, 10:04 AM realred914
Spin on type, drops the filter about an inch, no ... May 20 2010, 10:08 AM sean_v8_914 did you check, make sure your fan did not eat some... May 20 2010, 10:22 AM yeahmag I had that happen on my 2276 Type I once... Good p... May 20 2010, 10:26 AM realred914 hence you put on a fan screen taken from a late mo... May 20 2010, 10:40 AM |
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