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Registered
Join Date: Oct 2014
Posts: 1,736
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Oil pressure gauge on a '74
I have a stock '74 911. Today the oil pressure gauge started behaving funny. With the engine warm (190 degrees), at 3k RPM the gauge reads 60, with a very slight oscillation. Between 3k and 4k, the needle instead of rising steadily and smoothly it bounces back and forth in the range between 60 and 100, with fast oscillations. When I slow down to idle, the needle drops all the way to the bottom of the scale.
Can it be that the issue is just the gauge, or is there likely to be a problem with the oil pump?
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"Fraud is everywhere in this hobby. Believe nothing, believe nobody, expect disappointment." |
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06-10-2017, 09:21 AM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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My 74 also has 60psi at 3K. 20psi at hot idle. Are you using cam oil line restrictors?
Gauges are sort of a rough measurement. Might want to confirm oscillations with a mechanical gauge.
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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06-10-2017, 09:31 AM
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Registered
Join Date: Oct 2014
Posts: 1,736
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I don't think I'm using restrictors - sorry I am completely ignorant on this stuff. What I can say though is that until today the needle moved smoothly and nicely.
Sent from my ONEPLUS A3000 using Tapatalk
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"Fraud is everywhere in this hobby. Believe nothing, believe nobody, expect disappointment." |
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06-10-2017, 11:44 AM
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Registered Minimalist
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I run like 60psi at 3k. 20 at hot idle. I have restrictors. I does fluctuate quite a bit. Only when it's super high or super low do I worry.
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Duane / IG: @duanewik / Youtube Channel: Wik's Garage Check out my 75 and 77 911S build threads |
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06-10-2017, 03:59 PM
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1975 Porsche 911s
