At the higher revs and the resonate point the vibration of the engine causes
the float bowls to froth and the engine goes lean. You might try using some
isolator blocks to reduce the vibration some and this will help. In the
engine dyno at 5500 I've taken hold the carburetors and they were buzzing so
bad it hurt my well callused hands.
----- Original Message -----
From: rob
To: fot@autox.team.net
Sent: Saturday, March 05, 2005 3:20 PM
Subject: Fw: dyno running lean
----- Original Message -----
From: rob
To: rot@autox.team.net
Sent: Saturday, March 05, 2005 4:43 PM
Subject: dyno running lean
Hello folks I have just spent some time tunning. I can get a good Air/fuel
curve and power all the way up to 5500rpm At 5500 she is still making
power
but the A/F is shooting up into the high 15's --16's and i just have to
back
out The fuel pressure remains at 4 lbs the gage has be ckecked aganst
another >> the jet changes will only make me rich at the lower rpm she'll
stummble to get cleaned out but still goes lean . We have been all over the
board with jetting .With aprox 30 hours of tunning We have not been able
to
get a way from the high A/F at the higher rpms Drilling the pump jet
helped
but only put off the running lean >>Its a Tr-6 Moss's 40 over pistons
stock thre out except for Good parts 1.55 roller rockers with 40 dcoe's
11.5 to 1 c/r >>aluminum fly wheel stock clutch and 4 speed curently at
155hp
to the wheels thanks rob
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