Larry, I'm running Z/S carbs from an earlier TR4, with the adjustments on
the bottom of the carbs, on my TR6; seem to work well. I had a minor problem
with the linkage and had to fabricate a few items. Also the linkage from the
accelerator pedal shaft is different: on the TR6 when you hit the gas, the
link to the carbs is pulled rearward on the standard carbs. On the ones I
use, the link has to be pushed forward. Solution: loosen the bolt on the arm
on the gas pedal linkage, push it downward until it's pointed almost
straight down and tighten. When you hit the gas now, the link pushes forward
and the carbs are opened. EZ!
When fabricating linkage, I clamp a 2x4 in my vise, about 3 feet long, bolt
the intake manifold to it, and bolt the carbs to the manifold. Then
fabricate the linkage. I told that to a guy at Pegasus one time and he said
that's how he does it!---Whatever works.
Bill- Original Message -----
From: "Larry Young" <cartravel@pobox.com>
To: "FOT" <fot@autox.team.net>
Sent: Sunday, January 08, 2012 1:24 PM
Subject: [Fot] Undetuning and restoration of a TR250
> Over the past couple of months, I have finally gotten started on the
> restoration of my TR250. I have had this car since it was new. It is
> very nearly in original condition, because I never had the money to modify
> it back when I wanted to. Since I plan to keep it fairly original, the
> FoT is probably the wrong group to be talking to. So, where do the 6
> cylinder guys hang out?
>
> '68 was the first year the emission laws started to take their toll on
> performance, as evidenced by the TR5 vs TR250. I would like to make it
> perform better, while keeping a stock looking engine appearance. I'm
> thinking along the lines of the 125 mph car that Kas did for publicity
> back in the day. My thoughts at this point are to increase the
> compression to the limits imposed by pump gas. Change to a longer
> duration cam, i.e. more like the early PI cam. I'm not sure how to tune
> the nonadjustable carbs when the engine is modified. I was also thinking
> about getting rid of the wacky ignition retard, but continuing to use the
> vacuum advance. Does anyone have any suggestions on how I can accomplish
> my goal within the limits I've imposed?
>
> I have an old Cam Doctor that I have used to look at several TR3/4 cams.
> I have a fairly popular webpage on those cams at
> www.TildenTechnologies.com. .As part of this effort, I'd like to do some
> research and a similar page for 6 cylinder cams. Does anyone have an early
> PI cam that I could borrow to analyze for this effort? Or, perhaps other
> street performance cams?
> Thanks,
> Larry Young
> _______________________________________________
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>
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