need some quick tuning help

[sbsumerix]

i have a jeep wrangler with a 350 chevy motor. i took it out this weekend and having a 350 and 4.10 gears locked it should do more then a 5 ft burnout in gravel and sometimes from a dead stop if you floor it it stalls what should be the first course of action messing with the timing or adjusting the carb?

 

[tpking]

does it bog down or just take off? if its bogging down it may be the carb

 

[mikepotts]

i would at least check the timing before touching the carb.

 

[mikepotts]

and what kind of 350 is this... what cam, heads, carb, ect. could be a mismatched combo.

 

[martin]

Sounds like a problem with the accelerater pump or power valve or both.

 

[sbsumerix]

its a crate motor 350 that got sludged up i rebuilt it and it ran ok the only time we took it out last year. it has stock heads for the crate motors, a edelbrock 600 performer carb, a low rpm torque cam cant remeber the specs and edelbrock intake. it just completly bogs down when you hit the gas and sometimes stalls out

 

[mikepotts]

GM crate or parts house crate? stock cam i assume?

IMHO get a holley dbl pmp 600. i hate edelbrock carbs, they claim mechanical secondaries, but have a counterweighted secondary butterfly inside (yuck). ive owned 3 edelbrock carbs (thought maybe i was getting lemons since others like them) and NONE of them worked good! when i replaced each of the 3 with holley dbl pmp'rs... WOW what a difference! i know someone will defend the edelbrock carbs... from my experience, i just dont like them.

 

[sbsumerix]

yeah we were planing on switching to a holley truck avenger carb since the edelbrock always dies out on steep angles and the holley is supposed to do better offroading or maybe switch to a quadrajet i want to say its a gm crate motor i dunno we bought it years ago.

 

[mikepotts]

okay, can i inform you of another option... propane!

pros:
around 107 octane (you can build a motor with higher compression)

lower on the hydrocarbon scale, thus lower polution, and less carbon deposits on internal engine componets (pistons valves ect)

no liquid fuel to slosh in bowls and make it stumble in off angles (will actually run upside down!)

no loss in power! (when a dedicated system)

cons:
availability (just get extra bottles)

 

[jtsmustang]

i think u should get a ford that would probably fix ur problems

 

[sbsumerix]

yeah maybe we went through about 5 350's in the jeep already i dunno my dad called and said he took it out the other day and it ran fine but then the electronic coolingfan didnt turn on and it was running 230 i guess the fan stipped out on the motor and wont spin we think its because it only has about a 1/4 inch of clearance between the water pump and the fan and it hits every time the fan starts.