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Ol' Ron · 08-29-2018, 08:13 AM

I'v been fowling this post,as I'm using a similar radiator in my roadster.
I've had some experience in tuning these engines, and have come up with the following advance curve that works well with most engine modes as well as stock. unfortunately it doesn't work with the Load a matic. Also today's gas makes it difficult to read the plugs, so I use an AF meter. Takes the guess work out of the equation. This way yo can see the AF under load as well as in cruise.
Also , I;ve run several engines with out a fan on the open toad with no cooling problems. The unknown here is the carburetor. I think a stock 8BA carb and distributor would solve your problem, but here's what I KNOW works

Ignition Mechanical advance 16-18 degs all in by 2000. Vac advance 6-8 degsa at hi vac.

AF 12.7/13.2 Power . 14.5/?? this can run up to 16 in a BUILT engine for economy. Working on that. In Richards engine he got up to 15.5 in cruise.

All these numbers vary abit under different atmospheric conditions

Good luck
OL' Ron

08-29-2018, 08:13 AM	#44
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,890	Re: 8BA Flathead overheating on highway I'v been fowling this post,as I'm using a similar radiator in my roadster. I've had some experience in tuning these engines, and have come up with the following advance curve that works well with most engine modes as well as stock. unfortunately it doesn't work with the Load a matic. Also today's gas makes it difficult to read the plugs, so I use an AF meter. Takes the guess work out of the equation. This way yo can see the AF under load as well as in cruise. Also , I;ve run several engines with out a fan on the open toad with no cooling problems. The unknown here is the carburetor. I think a stock 8BA carb and distributor would solve your problem, but here's what I KNOW works Ignition Mechanical advance 16-18 degs all in by 2000. Vac advance 6-8 degsa at hi vac. AF 12.7/13.2 Power . 14.5/?? this can run up to 16 in a BUILT engine for economy. Working on that. In Richards engine he got up to 15.5 in cruise. All these numbers vary abit under different atmospheric conditions Good luck OL' Ron