[Fot] Ignition timing in a TR-4

[Greg "Lunker" Hilyer]

Jim,
My guess is that with that much total, the initial would be too much  
for a hot-start ["bucking" against the starter].
My rule of thumb is +1 deg per thousand feet over 2000. You're at 5000 
+ [as am I] so I would suggest -3 as a starter.
Greg "Lunker" Hilyer
TR4 #314
Albuquerque NM
 From there keep an eye out for any sign of blistering of the plugs.

On Jun 30, 2010, at 3:29 PM, toodamnfunky at comcast.net wrote:

> Thanks Bill,
>
> I'm running Mikuni HSR 45's. The jetting will be a snap with 200  
> mains & a couple notches on the needle jet clips. I just don't want  
> to knock any holes in my pistons & 36 - 38 seems a bit much for  
> that elevation.
>
>
>
> jg
>
>
>
>
> ----- Original Message -----
> From: "Bill Babcock" <billb at bnj.com>
> To: toodamnfunky at comcast.net
> Cc: "fot" <fot at autox.team.net>
> Sent: Wednesday, June 30, 2010 1:47:32 PM GMT -07:00 US/Canada  
> Mountain
> Subject: Re: [Fot] Ignition timing in a TR-4
>
> You are unlikely to need to change your timing if you get the  
> carburetion right. In theory if you are using SU you should be OK,  
> in practice you might want to go a little richer. If you're using  
> webers you will have to spend an hour or so doing plug chops and  
> getting your compensator and main jet right. You'll need a couple  
> of sets of new spark plugs to get it just right.
> On Jun 30, 2010, at 12:42 PM, toodamnfunky at comcast.net wrote:
>
>> Greetings FoT
>>
>> I am planning to attend the Kastner Cup in August and I'm not sure  
>> where my
>> timing
>>
>> wants to be at roughly 800 ft above sea level. My only experience  
>> with the TR4
>> is at
>>
>> 5200 ft. and 36 -B 38 degrees BTDC is the norm around here. The  
>> car has 12.5:1
>>
>> compression and I generally use 108 octane fuel.
>>
>> Any advice for Topeka would be appreciated.
>>
>> Thanks,
>>
>> Jim G.
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>>
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