[DeTomaso] Compression ratio question

asajay at asajay.com asajay at asajay.com
Mon Sep 24 12:33:56 EDT 2007


Doug,

A very good point.  (no pun intended).

On my Mach I, there is a very nice plastic fitting that fits on the  
coil that attached both wires.  The connections on the coil are not  
screw-type, they are a slip on type, which makes it very easy to  
connect/disconnect the coil, jut by slipping the connector off.  It's  
really cool. :)

Asa Jay

Quoting Doug Braun <doug at silicondesigns.com>:

> A better way to disable the ignition during a compression test is to
> disconnect the points wire or the 12V feed wire from the coil on a standard
> ignition system or disconnect the magnetic or optical trigger wire(s) on an
> electronic ignition system.  If you remove the coil's center high tension
> wire to disable the ignition system but still allow the coil to be fired, it
> may be damaged by arcing over inside.
>
> Doug Braun
> blue 73L #5505
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of JDeRyke at aol.com
> Sent: Saturday, September 22, 2007 10:04 PM
> To: dagny-kr at online.no; detomaso at realbig.com
> Subject: Re: [DeTomaso] Compression ratio question
>
>
> 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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