 Low Oil Pressure on Hard Deceleration, 2.056L with Dual Carbs |
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Tuesday, 22 July 2025 |
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| Spoke |
 Sep 12 2016, 11:01 AM
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#1
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Jerry  Group: Members Posts: 7,195 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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I bought this allegedly running-when-it-was-pulled 2L engine last year to upgrade to 2.056L just to find out it already had 96mm P&C.
Internals turns smoothly so I thought I'd do the flame test and clean the engine and put it back together. The engine runs strong and smooth. As I started driving it harder I noticed on fast deceleration the oil light would come on. If I let the engine speed come down naturally from about 2k, the oil light doesn't come on. Last night coming off the highway running about 3.2k, I immediately shifted into neutral to let the engine slow on its own, the oil light came on for a few seconds as the engine was now idling. I don't have an oil pressure gauge on it to see where the oil pressure is during operation. Any ideas of what to look at? Attached thumbnail(s) 
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| VaccaRabite |
Sep 12 2016, 12:54 PM
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En Garde! Group: Admin Posts: 13,759 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region
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Chris Foley was selling a pressure booster that replaced the spring and piston in the relief cavity, IIRC.
I'd put a pressure guage on it to see what your pressure actually is. You should be getting about 10 PSI for every 1000 RPM. The stock idiot light goes off between 2 and 6 PSI, so hopefully the sender on your car is on the higher end of that range. Zach |
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| boxsterfan |
Sep 12 2016, 01:00 PM
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
QUOTE(Vacca Rabite @ Sep 12 2016, 11:54 AM)  Chris Foley was selling a pressure booster that replaced the spring and piston in the relief cavity, IIRC. I'd put a pressure guage on it to see what your pressure actually is. You should be getting about 10 PSI for every 1000 RPM. The stock idiot light goes off between 2 and 6 PSI, so hopefully the sender on your car is on the higher end of that range. Zach (IMG:style_emoticons/default/agree.gif) That oil pressure relief valve is a problematic design. |
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Posts in this topic
Spoke Low Oil Pressure on Hard Deceleration Sep 12 2016, 11:01 AM
Tom_T Spoke,
Both my `73 914-2.0 & our `88 ... Sep 12 2016, 11:21 AM brant I'd replace the sending unit too.
put on a dua... Sep 12 2016, 01:10 PM The Cabinetmaker I don't think Chris' valve was intended to... Sep 12 2016, 01:41 PM '73-914kid I would recommend installing a tuna can on the sum... Sep 12 2016, 03:00 PM '73-914kid Also, what oil and weight? Sep 12 2016, 03:01 PM
Spoke
Also, what oil and weight?
Valvoline VR1 20W-50... Sep 12 2016, 08:32 PM 914Bryan I agree with what Ethan said about overfilling the... Sep 12 2016, 03:14 PM Dave_Darling Every time I have had the oil light come on under ... Sep 12 2016, 08:04 PM Vacca Rabite Internal clearances may be too high.
But I would c... Sep 13 2016, 07:39 AM Spoke
I have a single pole pressure sender, and a stock... Sep 13 2016, 08:26 AM Dave_Darling
Also, where to buy an oil pressure gauge and send... Sep 13 2016, 09:33 AM colingreene Do you know for sure that the windage tray is in i... Sep 13 2016, 11:46 PM Spoke
Do you know for sure that the windage tray is in ... Sep 14 2016, 01:19 PM |
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