Worried about high oil temps?, and/or low oil pressure? |
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Worried about high oil temps?, and/or low oil pressure? |
ChrisFoley |
May 28 2014, 05:21 PM
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#1
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I am Tangerine Racing Group: Members Posts: 7,924 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
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. (IMG:style_emoticons/default/smile.gif) |
majkos |
Aug 22 2014, 08:09 AM
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#2
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Senior Member Group: Members Posts: 1,370 Joined: 29-February 04 From: Mile High 914 Member No.: 1,729 Region Association: Rocky Mountains |
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 (IMG:style_emoticons/default/first.gif) 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! (IMG:style_emoticons/default/WTF.gif) 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. |
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