Re: Re: Ping and Rattle problems

From: nosdakota (nosdakota@email.msn.com)
Date: Fri Oct 29 1999 - 23:31:59 EDT


Are you getting rammy again?
Joe W.
87 Shelby Charger 13.9
98 Dakota 13.1
----- Original Message -----
From: Bernd D. Ratsch <bernd@texas.net>
To: <dakota-truck@buffnet.net>
Sent: Friday, October 29, 1999 11:00 PM
Subject: RE: DML: Re: Ping and Rattle problems

>
> That's right...don't run high octane. If you do, just run some water
> through the throat of the TB for a little bit and wash away all that nasty
> black stuff. (Yup...that old trick still works today.) ;)
>
> High Octane fuel can knock just as bad as low-grade (takes a while
> though)...but yup...totally correct. That why you should ADVANCE the
timing
> slightly to allow for the slower burn rate. That's also why most
> aftermarket chips require one higher grade of fuel...they advance the
> timing. (Mopar SBEC's are proof for that fact.)
>
> Should you run 92 in your VW bug? God no...7.5 - 8.0:1 compression ratios
> suck...unless ya throw a blower (or Turbo) on it...but that puts you right
> back to slightly higher grade fuel. (Kinda sounds like that old Cocaine
> commercial: I make more power, so I need better gas, so I can go faster,
so
> I can make more power.....)
>
> This is getting silly....(and i'm getting tired.) Are we back to 5
speeds
> vs. Automatics yet?
>
> - Bernd
>
>
>
> The most obvious is:
> high compression ratio ;-)
> Actually, high octane gas causes knock also. Running high octane when its
> not necessary (and sometimes when it is) causes excessive buildup of
> deposits inside the cc. These deposits do two bad things. First, the
retain
> heat very well, which aids knock and second, they increase the CR, which
> also increases knock. So today's lesson is: Dont run high octane unless
you
> HAVE to.
>
> --
> Dave
>
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