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350 HOLLEY Jet size
Posted: Sun Aug 23, 2009 12:34 pm
by Wozza244
I have a blue 202 motor with a mild cam in it, extractors and a 350 holley.
It is using too much fuel, the plugs are black and the exhaust is black and blows a bit of soot when its loaded up.
I have opened it up and checked the jet sizes, 61's they are.
Anyone know whether i should be running the 61's with this engine or go lower eg, 55's 57's??
Posted: Sun Aug 23, 2009 7:39 pm
by brad-chevlux
what ignition system are you using?
what ignition timing?
how much manifold vacuum do you have at idle and cruise (70km/h in top gear)
what ignition system are you using?
61s shouldn't run that rich on a 202.
Posted: Sun Aug 23, 2009 8:53 pm
by Wozza244
brad-chevlux wrote:what ignition system are you using?
what ignition timing?
how much manifold vacuum do you have at idle and cruise (70km/h in top gear)
what ignition system are you using?
61s shouldn't run that rich on a 202.
Electronic ign.
Dunno timing cause it has a cam, so its done by ear.
Havent got a vac gauge to test it mate will try organise one tho
Thinking of trying 57-58 or something
Any more help will be tops, cheers.
Posted: Sun Aug 23, 2009 9:14 pm
by brad-chevlux
I've seen alot of people blame jetting when the real problem is weak spark.
Don't change more then 2 jets sizes at a time.
Posted: Mon Aug 24, 2009 1:47 pm
by Loanrangie
I had a 350 on my RR with 3.5 and ran 59 jets and 65 power valve which was spot on for power and economy.
Posted: Mon Aug 24, 2009 3:02 pm
by sloshy
Standard specs for that carb-
Jets-61
Power valve-85
Accel pump nozzle-31
Sometimes helps to go back to standard settings and start to tune from there.
Posted: Mon Aug 24, 2009 5:41 pm
by Wozza244
Cheers for the help people, but i blew the engine on my way home from work today....
FARRRRRRKKKKK!!!!!!!!!!!
Posted: Mon Aug 24, 2009 6:03 pm
by sloshy
Wozza244 wrote:Cheers for the help people, but i blew the engine on my way home from work today....
FARRRRRRKKKKK!!!!!!!!!!!
Sweet, now you can throw in a holden 355 or a chev
Posted: Mon Aug 24, 2009 6:35 pm
by Wozza244
sloshy wrote:Sweet, now you can throw in a holden 355 or a chev
Unfortunately not by the weekend!!!
I have a road trip planned, its our annual trip!!
Posted: Mon Aug 24, 2009 7:52 pm
by mkpatrol
Also, check your float level while you are at it. If its a bit high it may be flooding slightly.
Holleys are renowned for leaky powervalves. They are cheap to replace.
Does it have an Auto choke? I think there was an auto choke option, check to see if that is set correctly as this will make it run rich.
But as Brad said, check your ignition system first. how much compression has the engine got?
basics, basics, basics
Posted: Mon Aug 24, 2009 9:31 pm
by 80's_delirious
mkpatrol wrote:
basics, basics, basics
does a blown engine come under "basics"?
Posted: Tue Aug 25, 2009 8:48 am
by mkpatrol
80's_delirious wrote:mkpatrol wrote:
basics, basics, basics
does a blown engine come under "basics"?
Yep, if it doesnt have enough compression
