[DeTomaso] Compression Ratio Question

[Art Stephens]

Tony,
     How much advance was it that caused you problems?  Enquiring minds want 
to know.

Thanks,
Art


----- Original Message ----- 
From: "tony DiGiovanna" <tonydigi at optonline.net>
To: "Ken Green" <kenn_green at yahoo.com>; <detomaso at realbig.com>
Sent: Monday, September 24, 2007 8:14 PM
Subject: Re: [DeTomaso] Compression Ratio Question


> -----Original Message-----
> Ken Green
> Does anyone know if there are easy ways to detect high RPM detonation?
> Seems like it would be a lot harder to detect than the obvious low RPM
> "ping".
>
> Yes this is correct.
> The crack in my cylinder wall was my hint.
> The "sand blasted" appearance of the pistons kinda confirmed it.
> The curious haze above my Webbers around 5500rpm was also probably a hint,
> in retrospect.
> Too much timing advance was my problem.  More advance had been making low
> and mid range throttle response better.
> Couldn't hear, feel, or otherwise detect the detonation.
> A later experiment on a chassis dyno (with new block and a Holley carb)
> demonstrated significant torque drop off at 5500rpm when I put the timing
> back in the more-advanced state.
>
> Tony "will try the Webbers again soon" D
>
>
>
>
>
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