[Healeys] Fwd: compression electrical

[Oudesluys]

Readings on a cold engine are useless. You cannot make it work 
accurately as the oil is cold, thick and unevenly distributed, so the 
sealing of the piston rings varies. This goes for a compression test as 
well as a leak down test. Whatever the readings, do not rely on them for 
work on your engine.
Kees Oudesluijs
NL


Op 19-10-2011 1:29, john spaur schreef:
> Many thanks to all that responded about my compression test. Most 
> recommended that I do a leak down test. At it turned out I could not 
> get enough juice to turn the engine over for a compression test. It is 
> recommended that a leak down test be done on a warm engine but I had 
> to do it cold because it was out of the car.
>
> I purchased a US General leak down tester from Harbor Freight but I 
> question the accuracy for several reasons. The instructions say 
> connect the air, screw the tester into the cylinder and then set the 
> tester side of the gauge to zero. This produced a very uniform reading 
> of about 2% per cylinder.
>
> Youtube videos show one connecting the air, setting the gauge to zero 
> then connecting it to the cylinder to be tested. This generally showed 
> a 20% loss per cylinder although a couple were lower and higher. I 
> tested the cylinders four times and the readings varied. If I throw 
> out the low and the average is:
>
> 1-20%, 2-19%, 3-24%, 4-23%, 5-18%, 6-19%
>
> A 1998 compression test right after the head was rebuilt was:
>
> 1-140psi, 2-130-135psi, 3-135-140psi, 4-125psi, 5-125-130psi, 
> 6-125-130psi.
>
> On with the work.
>
> John
>
>> Date: Thu, 13 Oct 2011 21:50:40 -0700
>> To: healeys at autox.team.net
>> From: john spaur <jmsdarch at sbcglobal.net>
>> Subject: [Healeys] compression electrical
>>
>> So... I need to do a compression test.
>> John Spaur
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