According to the SCCA PCS you have to be 1 3/4" carbs, and only 2.
Charly
Competition Page 1969 PCS Book
1969 PCS Index
Manufacturer: Standard Triumph International Class: C
Model: TR-6 (SU)
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ENGINE:
Manufacturer ...... Triumph
Type .............. OHV 6 cyl in line
Bore & stroke ..... 2.94" x 3.74"
Capacity .......... 2498 cc
Head material ..... C.I.
Block material .... C.I.
Valve head dia:
Intake .... 1.438"
Exhaust ... 1.26"
Carburation ....... Two 1.75" Stromberg CD 175 or two 1.75" SU
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TRANSMISSION AND DRIVE TRAIN:
Clutch Diameter: 8.5"
Gearbox
No. speeds forward: 4
Ratios:
Std. Alt. Alt. Alt. Alt. Alt.
1 3.14
2 2.01
3 1.33
4 1.00
5
Overdrive
Make & Model: Laycock "A"
Ratio ....... 0.821
Final drive ratios: 3.45, 3.7, 4.1, 4.3, 4.55,4.87
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CHASSIS
Wheelbase ................... 88"
Track dimension, front ...... 50.25"
Track dimension, rear ....... 49.75"
Wheel Diameter .............. 15"
Rim Width ................... 5.5"
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BRAKES STANDARD ALTERNATE
Front: 10.75" Disc
Rear: 9.0" Drum
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WEIGHT & CAPACITIES
Official weight: 2006 lbs Radiator cap ...... 6.6 qt
Oil sump cap ...... 4.8 qt
Fuel tank cap ..... 13.5 gal
Alt: 25.2 gal
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ALTERNATE SPECIFICATIONS
----- Original Message -----
From: "kas kastner" <kaskas@cox.net>
To: "Chuck Arnold" <chuck.arnold@oracle.com>; "fot" <fot@autox.team.net>
Sent: Thursday, June 09, 2005 12:24 PM
Subject: Re: Tr6 PI and racing
> Not just outside the butterflies Chuck, WAY OUTSIDE. How much experience
do
> you need to believe this? As long as you are going to buy a new pump
anyway,
> get the mechanical one. It drives off the crank. In the end we needed TWO
> electric Lucas pumps to provide the fuel when we started making real HP.
You
> will need the electric pump for start-up though.
>
> If I were doing that engine again I would probably use 3 2" S.U's. the
> April/May 2004 issue of Triumph World has the story on how I beat the
Lucas
> system and made it a worker.
> ----- Original Message -----
> From: Chuck Arnold
> To: fot
> Sent: Thursday, June 09, 2005 8:48 AM
> Subject: Tr6 PI and racing
>
>
> I am setting up a TR250 for racing. Have decided to use PEtrol
> Injection. So now the questions begin [I know Charly Mitchel here in
> Seattle area. He is running PI this season in his TR6. He has had a
> lot of contact with Kas and I hope to benefit from his learnins.
> None-the-less, I thought I would quesry the august group about any PI
> experiences, modifications, etc.
>
> I located a whole PI system from a Mr. Priestly in NZ. $750 US
> inclucing shipping.
>
> Does anyone have have or know of any written resources [or URLs]
> regarding modifying/imporving PI for competition purposes? Saw one
> where someone suggested using one throttle butterfly before the plenum
> chamber and eliminating the six butterflies in the throttle bodies
> [seems reasonable -- no sync problem and simple throttle control.] Do
> n ot know if this would be legal for 1969 racing specs.
>
> I know Kas has suggests getting the injectors as far away as possible --
> even outside the butterflies. Has anyone had any experience with this?
>
> Other ideas/enlightenments other than replacing the Lucas fuel pump with
> a more reliable one [Mallory?].
>
> Thanks,
> Chuck
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