Why throttle WIDE OPEN??

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Posted by Ddd [108.162.221.41] on Sunday, April 08, 2018 at 12:34:49 :

In Reply to: Re: Compression Readings posted by Dozerman51 [162.158.255.193] on Friday, April 06, 2018 at 19:58:56 :

I don't understand . What does cranking with throttle open so to the readings? Make them lower?

I just re-checked my brand newly rebuilt 218
(Under 1000 miles on it)
And I got consistent readings across the board
Between 125-130 lbs.

Yours at 80 lbs seems low for a newly built engine?

Why does opening the throttle during the compression check alter anything? I didn't do anything but crank the motor with all Plugs out


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