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[FOT] HS6 carb tips

To: fot@autox.team.net
Subject: [FOT] HS6 carb tips
From: "Jack W. Drews" <vinttr4@geneseo.net>
Date: Tue, 30 May 2006 15:28:22 -0500
This message concerns two things - first, the bolt that holds the 
float chamber to the carb body, and second, the jet tube.

Bolt - last year that bolt broke in one of my carbs. That's the first 
time I had seen that in all these years. I replaced it with a grade 8 
bolt, and that one broke in the second event this year. To reduce the 
risk of having this problem again, I drilled out the hole in the 
float chambers and installed 5/16" bolts in place of the stock 1/4" 
bolts. I'm also going to soft-mount the carbs to the manifold. Others 
have pointed out the benefits but I never did it on my own car 
because I had not had problems attributable to fuel frothing, at 
least that I know of. We'll see if this is any improvement.

Jet tubes -- I converted my TR6 to SU carbs last summer. It ran 
great, then ran progressively worse, then wouldn't pull itself around 
the block. I replaced everything at least twice and just couldn't 
find the problem until this spring. I found that the tube that is a 
part of the jet tube, that connects it to the float chamber, was 
kinked inside the spring covering. It took me a long time to find 
that because any time I took out the jet tube it looked okay,even 
with the spring covering pulled back. The kink occurred only when the 
tube was held in place by the stock choke linkage. That linkage turns 
the jet tube just enough to create the force to kink the tube.

When I had my race car carbs apart to increase the size of the bolt, 
I checked those tubes too -- and yes, they were also tending to kink. 
To alleviate that problem, I removed the choke linkage and 
safety-wired the jet tubes in place.

I suppose some manufacturer changed the specs on the little plastic 
tube. I have an  older set of HS6"s in my junk box and the old ones 
had a larger diameter and stiffer plastic tube.

Any comments on all this?

uncle jack 



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