ANSWER: 170 PSI is now my estimated 'good' compression value I should see on each cylinder.So, let's say I'm working on a 1998 2.4L Nissan Frontier with a compression ratio of 9.2:1. ![]() I find the engine compression ratio specification and multiply it by 18 (I don't measure intake manifold vacuum). I know that for most engines, vacuum at idle is usually about 18 to 22 in.Hg (although some may produce only 15 to 17 in.Hg at idle). Once you've found the compression ratio, then you multiply it by the intake manifold pressure your vehicle's engine is producing at idle.įor example if a 2009 4.6L Ford F150 has a compression ratio of 9.8:1 and its intake pressure is at 17 in.Hg, then you can expect a cylinder pressure in the 170 PSI range (17 x 9.8 = 166.6, which I then round to the nearest 10 and call it 170). This involves doing a little research online or in a repair manual to find out the compression ratio of your particular vehicle's engine. If your online search doesn't turn up a 'good' compression specification for your vehicle, you can calculate an estimate of a 'good' compression value by multiplying your intake pressure by your engine's compression ratio. You can change the head ccs, deck height, overbore size, etc. Use this compression calculator tool to figure the compression you will get with the specifications you provide. It used to be that repair manuals had a factory specification for what the 'normal' cylinder compression should be. Free Engine Piston Compression Ratio Calculator and Engine Size Calculator. What Should The Normal Compression Value Be For My Vehicle? Looking at the table of the compression test results, I can conclude that cylinder #1 is the one causing a misfire due to low engine compression. Any cylinder with this compression (or lower) value will misfire. STEP 2: 26.25 = 26 (rounded to nearest one).Here's the math I would do to calculate the minimum allowable value: ANSWER: The result of this subtraction is the lowest possible compression value any cylinder can have.įor example, let's say I got the following compression test results: Cylinder.STEP 3: Subtract the result (the number that was rounded) from the highest compression value.STEP 2: Round the result to the nearest one (for example: 25.6 would become 26).STEP 1: Multiply the highest compression value by 0.15 (this is the decimal value of 15%).Here's the method I've used to figure it out: If you'd like to know the math calculation that figures out the lowest possible compression value any engine cylinder can have, then this is the section for you. How To Manually Calculate The Lowest Possible Compression Value ![]() What the low compression calculator does is to find out what the 15% difference compression value is from the highest compression value you got. If a compression value varies by more than 15% of the highest compression value, then that engine cylinder will cause a misfire and/or rough idle. Low Compression Calculator Low Compression Calculator: What Should The Normal Compression Value Be For My Vehicle?.How To Manually Calculate The Lowest Possible Compression Value.Unfortunately CCP have shut down my Omega account to eve-online for unknown reasons and their support ticket system is broken for me, so will not be able to keep this website updated in the future. CCP is in no way responsible for the content on or functioning of this website, nor can it be liable for any damage arising from the use of this website. Get the best deals on Sony PlayStation 5 Consoles and upgrade your gaming setup with a new gaming console. has granted permission to EVE BPTool to use EVE Online and all associated logos and designs for promotional and information purposes on its website but does not endorse, and is not in any way affiliated with, EVE BPTool. All artwork, screenshots, characters, vehicles, storylines, world facts or other recognizable features of the intellectual property relating to these trademarks are likewise the intellectual property of CCP hf. EVE Online, the EVE logo, EVE and all associated logos and designs are the intellectual property of CCP hf. ![]() All other trademarks are the property of their respective owners. EVE Online and the EVE logo are the registered trademarks of CCP hf.
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