Peter,
I agree with you. The 15 of dizzy advance with the 7 of initial advance
give a total of 22. This motor however is turbocharged. After cracking the
crowns of two sets of pistons, I've lightened my foot a bit and gotten
conservative on the timing. I'm too cheap to spring for the MSD
turbo-retard ignition system, so I settle for not adding advance that I
cannot remove when the boost kicks in. Less than optimal, but no cracked
pistons.......yet. If nothing explodes after a few weeks, I'll dial in a
bit more initial advance to give a total of 25 or so. This has proved to be
a tough problem to solve cheaply. Proper advance for normal use, but
magically retarding when boosting. I've thought about a vacuum dizzy with
the vacuum hooked to a tap on the manifold post-turbo. Then the 7deg of
vacuum advance would go away when the manifold pressure goes positive on
boost. What do you think?
Thanks for the thoughts
Glen
> 15* Total ignition advance sounds a bit low for for a reasonably cammed,
> moderately high compression engine operating in the 6k rpm range. 30*+
@3000
> would seem more appropriate.
> Peter
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/spridgets
|