[Fot] Sputtering TR question

[Tim Murphy]

Just curious, what needles did you settle on?  We have H6's on the race car
and went from SM needles to RB needles with the Kastner cam and about 11:1
or a little better compression ratio.  We're about 10 flats down and about
2.9 to 3.0 PSI fuel pressure at present, if I remember correctly.  Always
nice to know what the "base line" is for a street car.

Thanks,
Tim Murphy

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of Duncan Charlton
Sent: Wednesday, June 15, 2011 3:52 PM
To: fot
Subject: [Fot] Sputtering TR question

With the help of several people, I've got this licked.  Fuel pressure was
set
too high (4 psi) for the H6 SUs.  I adjusted that to 2.7 psi, installed
leaner
needles and cranked the jets up to 8 flats from where they'd been found at
19
flats.  Very good plug color now, no flat spots, and NO sputtering after
letting off the throttle and getting back on it again.  Seat of the pants
suggests there has been a power gain in the midrange.  Soft-mounting the
carbs
does not appear to be necessary.  Now to do some acceleration runs to
optimize
ignition timing.

Thanks to all who contributed -- Michael P, Bob K, Tim M, Jim G, Jim E, Bill
B, Russ M, Irv K, Scott B, Chris, Tony, Kas, and especially Greg Solow, who
walked me through this off-group.
_______________________________________________
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