jetting carb
#1
Junior Member
JOURNEYMAN
Thread Starter
Join Date: Jan 2008
Posts: 28
jetting carb
i have a jetting ? when the weather gets hot do you go up(rich) on the jet sizes or do you go down(lean) and ideas. 1/8 mile drag car with sbc running 114 sunnco race fuel.single carb 850 holley hp
#5
Senior Member
MASTER BUILDER
Join Date: Dec 2005
Location: Napier, New Zealand
Posts: 231
When the weather gets hot or the altitude goes up, the air gets worse so you can't burn as much fuel so you need smaller jets. I usually only alter the jetting two sizes.
I only alter the timing when the car is over powering the track (retard it 1 - 1 1/2 degrees. If I'm wanting to set her on kill I advance it 1 - 2 degrees. Just make sure you're checking your plug condition after each run to avoid detonation etc.
I only alter the timing when the car is over powering the track (retard it 1 - 1 1/2 degrees. If I'm wanting to set her on kill I advance it 1 - 2 degrees. Just make sure you're checking your plug condition after each run to avoid detonation etc.
#7
Senior Member
MASTER BUILDER
Join Date: Dec 2005
Location: Napier, New Zealand
Posts: 231
Originally Posted by JEFF69Z28
over powering the track= spining the tires?
#9
Senior Member
RACING JUNKIE
Join Date: May 2006
Posts: 2,044
I agree, hot/humid weather likes a leaner A/F ratio.
Jetting it down will aslo make it more consistent if you race where theres a temp drop from TT's to elims , E.G> daytime TT & nighttime racing.
I jet for consistency - not power/ET.\
Cp
Jetting it down will aslo make it more consistent if you race where theres a temp drop from TT's to elims , E.G> daytime TT & nighttime racing.
I jet for consistency - not power/ET.\
Cp