[Fot] Spitfire timing?

[Jim Norlin]

I'm going off of memory from the last dyno run which is always a 
dangerous thing - memory, not the dyno.

Our 1300 is prepped to SCCA HP limited prep rules - 11:1 compression, 
Kastner A8 cam, Sunoco 110 leaded fuel.  We made initial pulls at 36 
degrees and then played around a bit.  We made slightly more power by 
advancing up to 42 degrees but we all agreed (engine builder, dyno 
operator and me) that backing back down into the 30's in the interest of 
engine reliability made sense.  I think we ended up at 38, but it may 
have been 36.  Guess I ought to check, but then the engine is out of the 
car right now.

BTW, in my opinion, chassis dyno time with an experienced operator is 
the cheapest horsepower and best assurance that your timing and A/F 
mixture is set right.

Jim



On 6/2/2015 6:05 PM, Bud R wrote:
> Thanks for all the comments on timing.
>
> The source of the 48 timing number indicated that was a typo and they 
> meant 38 degrees total advance and going down from there until no 
> detonation. Sorry about that.
>
> I was just curious as Kas’  spitfire competition manual says 32 max or 
> there will be detonation. Which is where I have it set now with no 
> detonation.
>
> The car is going on the dyno on Tuesday so hopefully once the carb 
> (DCOE 40) is dialed in we will get the timing to where the engine 
> likes it 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 11:57 AM, Bud Rolofson <levilevi at comcast.net 
> <mailto: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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