Re: Knock @ 1975 RPMs

[Barry Tisdale <btisdale@cybersol.com>]

Thanks, Bruce -

Guess its time to 'take stuff off' and see if anything changes.  Don't
think cushioning the KS mount is something I'd want to do, sounds too
unpredictable.
The knock on coast tells me its not right; you never appreciate how many
times 2000 RPMs comes up during average driving till something like this
happens.  Major power fade as retard kicks in.

Isky not (any longer?) a major manufacturer?  They sure were 30 years ago!
Why?  Brand loyalty, more than anything; had 'em in all my 50's & 60's
cars.  Da**, more change over the years.....}:{E

Thanks - off tomorrow, will check things out - Barry  

At 09:23 AM 04/05/2000 -0400, nacelp wrote:
>
>
>If it's false knock, find the source.
>Can be lots of different things, exhuast rattle, serpentine belt,
>alt-P/S-A/C bearing noise.   Changing heads meant lots of stuff was apart,
>and even little brackets being deleted or installed differently can lead to
>silly arse problems that take hours to figure out.  Also, all the wear
>pattterns can get changed, and then a noise that wasn't even there pre
>modification, springs up.  So thinking a Alt. bearing now can't be the
>problem, traps you into not being able to find it if it is.
>I'd spend alot of time trying to find the problem, rather then disabling the
>KS, especially at that rpm range.  Mechanical fixes would be lossening the
>sensor slightly, or possible a more then a tad, remounting it with teflon
>tape, remounting it on a short "coupler".
>  Maybe with that particular setup it doesn't want much timing there.   I've
>seen a calibration take a 12d change relative to the values around it in
>timing to take out a "knock" after a cam change.
>What lead ya to Isky?.  Ya know anyone running one you can compare notes
>with?.  On the EFI stuff unless for all out racing, probably a better idea
>to stay with one of the major cam companies, and be conservative rather then
>risk, a deep hole (not meant as a flame just for others maybe considering
>the same changes)
>Grumpy

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo@lists.diy-efi.org