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Discussion summary
YOUR RESEARCHMeasured my crankcase vacuum...@ ~6" water
Leading reported evidence
Adjust specific density
Performed · outcome unconfirmed
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Read evidence and context
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Leading evidence: 'Adjust specific density' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust specific density' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
Yes, that's exactly what I did - "...Then I adjusted for specific density..."
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Performed · outcome unconfirmed · Original poster
I used a clear tube partially filled with engine oil instead of water in case it gets sucked into the engine.
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Suggestion · Original poster
Not sure what's the pink stuff they put in the tube but I would hesitate to use anything other than engine oil.
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Suggestion
I had Tony Callas of Callas Rennsport, who may have written the article you read, measure mine with a manometer he uses on BMWs.
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Yea, saw that before but decided it's too much work and functionally no difference anyway.
I read it in Excellence mag or somewhere that the crankcase pressure should not exceed 9" H2O, otherwise the AOS may be faulty and creating too much vacuum. Mine measured ~6" H2O.
I used a clear tube partially filled with engine oil instead of water in case it gets sucked into the engine. Then I adjusted for specific density. Now that I have a baseline for future reference
***Update: Normal value should be 4-6" water. See the article
here
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Oil has lower density than water, hence it makes sense that the column will be higher. You can search online for density difference - the height column will be proportional. I bet it's 0.8x lighter, hence 6" oil equals roughly 5" water...
I had Tony Callas of Callas Rennsport, who may have written the article you read, measure mine with a manometer he uses on BMWs. My rebuilt engine had 5 inches at idle, which Tony said is ideal.
That's it! I knew I read it somewhere...just escaped my mine who wrote that article. Thanks for the 5-inch data so now I know I'm not too far from it at ~6" H2O.
Yea, saw that before but decided it's too much work and functionally no difference anyway. Not sure what's the pink stuff they put in the tube but I would hesitate to use anything other than engine oil. The reason is if the suction is too much (you have no way to tell ahead of time before you measure it), the engine will suck in whatever solution you put in the tube...Engine oil works great. Just need to multiply whatever you measured by the the specific density of the oil (0.845 for Motul x-cess 5w-40 in my case) to get the reading in water, as explained by black_on_black.
I figured. It's good to explain to other people anyway
