[Fot] Advance BTDC for 1296 Spit?

[Mike Harmuth]

Bud, I'm running 34 degrees from 3500 up and could probably go more. I used
to run 36 with an older, lower compression engine, but that was with a
pertronix set up. Currently using a points system from Jeff at Advanced set
up (19 degrees mechanical advance up to 3500) for this cam (APT-BK74) and
compression ~ 13.2.  No knocking, no overheating, could probably go some
more still tweaking the fuel system.

mike h

On Sat, Nov 21, 2020 at 1:46 PM Bud Rolofson via Fot <fot at autox.team.net>
wrote:

> Listerati,
>
> I’m curious what total advance you Spifire racers are using @3000-4000 RPM
> and up?
>
> I had someone in New Mexico swear that he runs 48 degrees @4000 RPM and
> backs down by 2 degrees until it doesn’t knock on WOT. I’m not sure I’m
> brave enough to run that much advance.
>
> What say you list? What total advance are you running at what RPM. And
> what compression ratio?
>
> I’m running 36 degrees total advance @ 3000 RPM for a 12.52 compression
> engine and that’s worked pretty good so far. But I’m always looking to get
> out of the corners faster yet pull hard in the straights sooo……??
>
> Thanks
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
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>
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