At 08:48 AM 11/19/98 , john donohoe wrote:
>How did you come up with a 2.5 liter engine with a manifold that was
>too small for the carbs? Are HD 8's larger than ZS 175's (which is
>what I would expect to find on a TR6).
HD8's are 2" SU's and the flange as I remember it was like a 45 degree
oval. The carbs needed a more square face to bolt to.
>I guess I figured that the adapter (to fit between the new carb and
>old manifold) which lowers each carb, would also taper down from the
>larger bore to the smaller, as well as present new, appropriately
>sized flanges
In increase my flange surface size to accommodate the larger carbs I
added more material to the bottom of the flange to make it lower
sitting. I then ported the new hole lower relative to the original
inlet. HD8's are tall carbs and therefore I can't see much of a problem
with CD 175's. Maybe a 1/4" lower will suffice.
I remember dabbing lipstick on the top of my damper and gently lowering
the hood until there were no more red spots on the hood to figure out
how much lower I had to go. The front carb of course is the critical
one.
The thing to keep in mind is that aluminum can be built up very easily
and reground and built up again if you make a mistake.
-Maurice
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