[Fot] Spitfire timing?

[Bud R]

Thanks Kas,

The idea of starting high and backing off the timing until no detonation just didn’t seem like a good idea to me at all. Why do that to an engine? Thanks for affirming that is a bad idea.
I’m running 110 Sunoco, no domed pistons, and about 11.57 CR. I’ve got a dyno test setup so that will get it where the car runs best.

Thanks
Bud

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 
77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)


On Jun 2, 2015, at 5:13 PM, Kas Kastner <kaskastner at gmail.com> wrote:

> Ignition timing is decided by the quality of the gasoline provided to the engine and the elimination of detonation. With 100 octane you would not dare use more than 30 degrees with a TR-3,4  full race engine, but with 110-113 generally provided by the race management for sale (be sure to ask) then another couple degrees is certainly reasonable and there will be a power improvement. Maybe even a little more timing than that if you have not yet optimized your compression ratio. If you wait to hear detonation, chances are you will be to late to save the engine from some damage.
> 
> Detonation occurrence is the determination of how much ignition advance you can safely use regardless of the engine type, style or manufacture. CLEAN spark plugs and a high rev shut off will tell you about all that.
> 
> Oh yeah, here is old Kas again ranting on about checking the spark plugs.
> 
> Never be beaten by equipment.
> 
> 
> On Tue, Jun 2, 2015 at 3:53 PM, Duncan Charlton <duncan.charlton54 at gmail.com> wrote:
> I assume that includes vacuum advance, which many racers would not use.  I have always assumed that the vacuum advance is really a fuel economy improvement device and that it would not ever come into play at full throttle.
> 
> Duncan
> (Texas)
> 
> > On Jun 2, 2015, at 5:01 PM, Greg And Alison Blake <ablake2 at austin.rr.com> wrote:
> >
> > Not a spitfire guy but 48????  WOW that seems really high.
> >
> > My TR3 race motor likes 30. It's never been on a Dyno so I am sure I am leaving some power unused, but I don't melt Pistons or hammer bearings either.
> >
> >
> >> On Jun 2, 2015, at 12:57 PM, Bud Rolofson <levilevi at comcast.net> wrote:
> >>
> >> Amici,
> >>
> >> What timing setting are you Spitfire racers using? I've seen suggestions from 32 degrees total advance to 48.
> >> Thanks
> >> Bud
> >>
> >> Sent from Vail pass 10881 ft elevation. Will be back home in a couple hours from our Utah National Park tour in the RV.
> >>
> >>
> >> Sent from my Commodore 64
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