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Another consideration is rod length and it's effect on the engine's output. This elevates compression pressure further. According to professional mechanics, a healthy engine should have compression of over 100 psi per cylinder, and the deviation between the maximum and minimum readings should not exceed 10%. With the big cam in my 12.5:1 BBC, DCR is 8.0 and cranking est. Only at mid range rpm does it count because there's too little time for much pressure to blow past it.). thanks. Is Clostridium difficile Gram-positive or negative? pontiac 400 compression test modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor. So I am thinking it has 6.75-7.25:1 comp ratio. , Loss of power. JavaScript is disabled. Here is everything that you need to know about outboard compression tests. The static compression ratio is approximately 10.94:1, intake valve closes about 60 degrees after bottom dead center and compression pressure is 190 PSI. The most desirable situation is that all cylinders, give the same or close to the same reading. This can reduce efficiency or damage the engine if knock sensors are not present to modify the ignition timing. The compression tester's needle should swing over to 90+ or more psi on the 1st Pulse With most motorcycles, and two strokes in particular, it's only really useful as a rough indication of cylinder sealing if you have an established baseline to look back on for the individual engine in question. so compressive heating is a variable in cranking pressure. which benefit does a community experience when its members have a high level of health literacy? it is purely theoretic. Cars for Sale: 1970-83 240Z, 260Z, 280Z, 280ZX. I autocross a lot and I started to get blue smoke on deceleration so I pulled the plugs after my last event and found oil on two plugs. Come join the discussion about performance, modifications, restorations, troubleshooting, maintenance, and more! Compression Ratio and PSI Compression Test I agree no, not really 9.6 = 135 PSI 10.1 = 145 10.5 = 158 No there's no real way of telling compression ratio based on cranking pressure although a few years ago I had a MS-dos program call CARFOR ver.7.20 and it got pretty close, but you needed to know a lot of info about the engine We use data about you for a number of purposes explained in the links below. Not to mention the difference between if it's hot or I tried to google this and couldn't get a clear answer. is 160 psi, but pump gas seems like a risky choice.. 7.0 to 1 = 140 psi 8.0 to 1 = 160 psi 9.0 to 1 = 180 psi 10.0 to 1 = 200 psi etc. I called holly and he sold me on this carb. Higher compression ratios can make gasoline (petrol) engines subject to engine knocking (also known as detonation, pre-ignition or pinging) if lower octane-rated fuel is used.