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RE: Fuel, Spark and Compression - Which one is it?

To: "'Randall Young'" <ryoung@navcomtech.com>, "'triumphmail list'" <triumphs@autox.team.net>
Subject: RE: Fuel, Spark and Compression - Which one is it?
From: "Hugh Fader" <hfader@usa.net>
Date: Sun, 24 Feb 2002 07:24:50 -0500
Randall,

Can you explain the theory behind this for us? Is there a variation that
works for other cams?

Thanks,
Hugh Fader
>
> However, it's not hard to check cam timing (with the stock
> cam) with just
> the rocker cover removed.  If you trust your TDC mark, it's
> even easier.
> Assuming the TDC mark is good :
>
> First turn the engine until #4 exhaust is just closing, and
> the crank is at
> TDC.  Set the valve lash for #1 intake and exhaust to .050".
> You can stack
> multiple feeler gages together for this.  It doesn't matter
> if the value is
> not exactly .050", as long as they are the same.  Now turn
> the crank forward
> one full turn, coming back to TDC and stopping.  You have to
> stop on the
> mark, you cannot turn the crank backwards (or the reading will be
> inaccurate).  If you do pass the mark, turn it two full turns
> forward and
> stop on the mark.  Now measure the lash on #1 intake and
> exhaust (without
> moving the crank).  If they are equal, then the cam is
> perfectly timed.  If
> the intake is tighter than the exhaust, the cam is retarded.

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