[DeTomaso] Compression ratio question

[Asa Jay Laughton]

I also pull all the spark plugs, which reduces the rotating compression 
load to only the cylinder under test.  This gives me a very nice first 
crank reading and doesn't wear out the battery much either.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1973 Pantera L 5533
[ASASCAT]
    
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JDeRyke at aol.com wrote:
> In a message dated 9/22/07 12:15:31 PM, dagny-kr at online.no writes:
>
>   
>> One thing i know for sure ,is that its very important to have the throttle 
>> wide open when measuring the compression pressure,as you otherwise build up 
>> vacum on the intake side and get wrong result :)
>>
>>     
> Agreed. FWIW, I block the throttles wide open, pull the coil high tension 
> wire from the coil and disconnect all the spark plugs, and rotate the engine 4 
> times per cylinder to ensure getting a full compression stroke under mnimum 
> load. This practice seems to result in consistent readings from one engine to 
> another. Cheers- J DeRyke
>
>
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