749 conversion

[Jon Fedock]

Thanks for the response even if it wasn't what I wanted to hear :(. I am
VERY aware of the problems from detonation, and am running VERY conservative
timing (less than 20 degrees) for the application. I am using a Syclone
(with its cast pistons) as the model. Besides, I'd rather blow this motor up
10 times learning before I build a "good" motor. Pistons were $73 dollars
from NAPA. Where were yours breaking? All the 4-cylinder turbo apps I have
had any experience with have had ring/ring land troubles, never piston
skirts. Also, how much boost and rpms (with cast)? THANKS again for your
input.
Jon Fedock


----- Original Message -----
From: Tom Sharpe <twsharpe at mtco.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, October 05, 2000 11:10 PM
Subject: Re: 749 conversion


>
>
> Jon Fedock wrote:
>
> >     Hey cool project! I been working on an ALMOST similar project. I am
> > using  a '730 running '749 code to run a twin (Chrysler) turboed Trans
Am.
> >  as all of the pistons had cracked skirts (#6 was
> > broken off).
> > this weekend (new cast pistons).
>
> I used to find lots of piston pieces in the pan from detonation (with the
motor
> still running fine - just no rod bearings) One melted the main bearing
inserts.
> Broke 2 cast cranks and lots of pistons before I learned to control
detonation.
> Steel crank, forged pistons, stock rods, 5500 rpm and water injection
fixed all.
> T04B on a 350 SBC. turbos are fun. TomS
>
> PS get ready to pull the motor again.
>
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