loose throttle shaft between the carbs..one carb opening all the way..the
other not completely...clamps slipping on the rod..RB
----- Original Message -----
From: "Greg & Alison Blake" <ablake2@austin.rr.com>
To: <fot@autox.team.net>
Sent: Thursday, March 03, 2011 6:15 PM
Subject: [Fot] Engine going flat at 4500 rpm
>I ran at TWS this past weekend and had some trouble with the TR3. On
>Friday
> and Saturday I could not get the engine to pull above 5500 RPM in 4th on
> the
> front straight at TWS. Coming out of the corners in 3rd, I was getting
> 6000rpm without issue. I checked the timing and it was rock solid at
> 32degrees at 3000-5000rpm. I run H6 carbs with RC needles and 0.100 jets.
> I run twin facet cube pumps pushing fuel from the cell at the back.
>
>
>
> On Sunday, we noticed that my cross shaft (at the firewall) had lots of
> slop. It turns out that the cross shaft was rotating about 10 degrees
> before it was pulling the little lever back that actuates throttle shaft.
> I
> had been checking the butter flies by moving the carb linkage at the
> carbs,
> bad mistake. My butter flies were not fully opening. So we corrected
> that
> problem (thanks Walt) and at the same time I replaced the Grosse Jets with
> Viton tipped float needle valves. Strange thing was I could not get the
> car
> to run over 4500 rpm on the front straight or pulling out of the corners
> after those two changes. I tried going a bit then a lot richer (to the
> point the car would hardly start) thinking that I had just introduced a
> lot
> more airflow at full throttle, but that did not help.
>
>
>
> Any ideas? I'd like to solve this one at home but I can't replicate the
> full load and this problem does not manifest until under full load.
>
> Thanks,
>
>
>
> Greg
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