[Fot] Ignition timing in a TR-4

[toodamnfunky at comcast.net]

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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