Jamie---I answered your post once, but it never showed up on the List. I'll
shorten it this time.
The HD8 is a two inch carburetor, so a poor match for the 1.75 intake manifold
on the TR6 engine. There is a wide selection of needles for the HD8 if one
wanted to experiment. Start by noting the differences between the needle
diameters and jets for the stock B1AF thruout the operating range. Then try to
match this to the needles available for the 8 and its (.125) jet.
Big job, small reward. Two HD8s are way too much carburetion for the stock, or
near stock 6.
Dick
Running one HD8
-----Original Message-----
From: Jamie Palmer
Sent: Wednesday, May 11, 2011 11:42 AM
To: 6pack@autox.team.net
Subject: [6pack] SU needles (but with a twist...)
So...discussion has been around HS6's. RiffRAF Racing has borrowed a set of
H8's (I think they are called HD8's?) of unknown origin and are rebuilding
those
to go on our TR6 ChumpCar. (see http://www.chumpcar.com if you're
wondering what
I'm talking about). So...has anyone picked a set of needles
for H8's, rather
than H6's? Recommendations? Remember, this is a race car,
so idle is
unimportant and fuel consumption is only of minor importance.
Engine is almost
completely stock, may have a cam similar to the G2 cam but
not sure (cam was
given to us, undetermined origin). I realize this isn't
optimal info to start
with but it's what we have...
Thanks in advance!
Jamie Palmer
Squadron Leader, RiffRAF Racing
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