Patrick,
Your cam does bleed off compression, I run a lot milder cam than you. The
next time your working on your truck, you might run a compression check. I
would
be curious what the pumping compression is, make sure you do it with
throttle plates open.
Thanks Frank
> -----Original Message-----
> From: Kabuki2@aol.com [SMTP:Kabuki2@aol.com]
> Sent: Thursday, September 17, 1998 3:36 PM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: RE: detonation with only 4 lb or boost?
>
> In a message dated 98-09-17 17:22:07 EDT, you write:
>
> << I am really quite
> skeptical
> of someone telling me that they can run 4 lbs boost in a stock Magnum
> engine
> and not have detonation and if someone told me 7 lbs, well they would
> need
> to
> show me. >>
>
> I use a larger cam, so maybe that has something to do with it. I might get
> 4lbs @ 4000rpm, and I know I dont get that much in the 2000-3000 rpm range
> with the 3.125" pulley. I also said I have no audible detonation, or
> detonation I can detect by ear... there may well could be, but I haven't
> run
> the truck on a dyno nor do I have a knock sensor, that's why I keep my
> boost
> retard at 1 for safety's sake.
>
> Same is the case with the 4x4 that uses a 2.75" pulley with no boost
> retard.
> His full size truck has gone low 14s at near 100mph with all terrain tires
> with the right conditions.. no audible detonation. Aside from the blower,
> he's
> running a mild "blower" cam, headers, a high flow cat into a custom bent
> cat-
> back, and that's about his complete list of modifications. While his
> engine
> may puff in the near future, it's been doing this for over a year now ..
>
> ttyl
> Patrick
>
>
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