Thread: Compression PSI
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Old 04-13-2013, 06:31 PM   #13
Mad Mac
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Join Date: Mar 2013
Location: New Zealand
Posts: 364
Default Re: Compression PSI

Quote:
Originally Posted by James Rogers View Post
Always check compression with the throttle wide open.
Why?

I am about to do a compression test and don't understand why the throttle must be wide open.

And do I shut the fuel valve off first? If not, am I not just introducing a lot of raw fuel into the cylinders and diluting the oil?

And why must the engine be hot?
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