On my TR250, I am going with:
9.5:1 Compression ratio.
Later wide port head (probably makes no difference)
Integral Cams Stage II cam 274 duration .425 valve lift.
www.integralcams.com
Later TR6 "swept" intake manifold. (makes a difference???)
Stock dual coil TR6 valve springs.
Mild head porting.
Three angle valve grind
Jag B1E needles in dual ZS carbs (from Joe Curto)
Stock Exhaust manifold
Bottom end balanced
Cam bearings
Lighten connecting rods (makes a difference ???)
Stock exhaust header.
I have been told to expect 140 to 150 hp. Engine is not together yet.
May go with triple ZS (Richard Good) and Falcon Exhaust headers in pass
II -- depends on how this goes.
See Richard Good for triple ZS and other "Good" things www.goodparts.com
You should hang out at 6pack@autox.team.net. Kissing cousins of the
triumphs crowd, and where all the 6 cylinder TR6 and TR250 folks are.
Don Malling
Peter Logan wrote:
> Two questions really:
>
> What would be the recommended way to get TR250 horsepower up to around 150,
> while staying with a carb setup ?
>
> And, does anyone have experience with triple (or more) carb setup, ie are
> there manifolds out there, would SU or Weber be the way to go, can it be made
> reliable etc ?
>
> Are there other upgrades that would be required, trans, drivetrain etc ?
>
> TIA for all suggestions.
>
> Pete Logan
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