Big Block Advance

Reply Subscribe

Thread Tools

Search this Thread

Mar 18, 2009 | 12:12 AM

ddn

Thread Starter

Burning Brakes

Joined: Oct 2000

Posts: 779

Likes: 1

From: Minneapolis MN

Big Block Advance

Hey all, need some advice on getting the spark advance table tuned for my BBC. I realize there probably aren't many if any Megasquirt users in here, but advance is advance, and I'm hoping someone can tell me if my advance table looks reasonable, and if not where I should look to make changes.

The engine is an all-iron 468, CR should be around 10.5.

I realize that at low vacuum I should probably have more advance in, but I'm not sure where.

Anyone have any advice?

Mar 18, 2009 | 09:55 AM

69427

Tech Contributor

Joined: Jun 2004

Posts: 20,868

Likes: 961

From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.

Quote:

Originally Posted by ddn

You want (need) more advance at the low kPa points, not low vacuum points. It looks like you could throw in another easy 10-15 degrees on the low RPM, low kPa points, tapering off as the MAP kPa increases. And depending on how knock sensitive your combination is, you could end up using an additional 2-4 degrees on the higher RPM WOT (100 kPa) points. The extra advance ought to make it a bit snappier on the throttle, and easier on the exhaust valves.

Mar 18, 2009 | 11:31 AM

baxsom

Le Mans Master

Joined: Jun 2008

Posts: 5,284

Likes: 235

From: Rockledge FL

hey megasquirt
i had one of those on my turbo eclipse.

Reply Subscribe