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Author Topic:   Holley 350??
dirtracer14
Member
posted August 07, 2003 09:26 PM
what would make the fuel dribble out the squirter when you bring the idle up about 2200? It seems to just dribble out if you hold the rpm...also the carb i think leaked down into the intake over night....but the bowl was still full? This is on a toyota 2t motor.


b4racing
Member
posted August 07, 2003 09:35 PM
I would think you are talking about fuel pullover Earl Parker is the one to ask about that or KPlugnut. BObby


thirty2rocksu
Member
posted August 07, 2003 10:51 PM
Would that be from to much vacum? What do the anti pullovers look like?


KPLugnut
Member
posted August 08, 2003 08:39 AM
Yes, pullover thru the squirters can be a problem with the 7448 carb, as well as with ministocks running 4412's, etc (but for different reasons). In inline 4cyl motors, harmonics from the engine's vibration itself tends to shake a signal into the accelerator pump circuit and cause dribbling. In that case, an anti-pullover squirter does little or nothing to solve it.
The anti-pullover squirters have a kind of "shroud" around them that helps keep the low pressure signal due to ultra-high vacuum thru the little carb from drawing fuel out the squirters.
Holley sells them, as to most carb builders. They are available in many popular squirter orifice sizes too.

There are numerous other things that builders have come up with to help keep pullover to a minimum, too. Some include a bleed going back into the bowl from the accelerator pump passage, spring loaded check valves, and even neatly fabricated little tin baffles over the squirter (don't laugh, I've seen some weird stuff! LOL).

Hope that helps,
KPLugnut

[This message has been edited by KPLugnut (edited August 08, 2003).]

gerald berry jr
Member
posted August 08, 2003 03:06 PM
make sure weight and ball are actually installed under squirter


dirtracer14
Member
posted August 13, 2003 09:06 PM
Well the anti pullovers seem to help a bunch...still atad but 100 times better.... Hey Kp what size jet should that 350 hjave for a 2tc motor with mild cam and a bit of comp?? with stock coil ...but will be going to msd real soon...


KPLugnut
Member
posted August 14, 2003 08:21 AM
Depending on what air bleeds and metering block work there is, start with somewhere in the 65-68 range (I'll admit that's on the rich side for the Toyo motor) and work from there. A 4.5 - 5.5 power valve should get you started as well.

Hope that helps,
KP


dirtracer14
Member
posted August 14, 2003 08:47 PM
Right now he has 77 jets in it....the block is bone stock...do we need to rejet


KPLugnut
Member
posted August 15, 2003 08:01 AM
77 jets are about 10 sizes too big unless someone has seriously modified the way the carb is metering fuel (air bleeds included), or unless there is no power valve (i.e., blocked off).
As many engine builders have said, a 350cfm carb with jets THAT big and a stock metering block is just a time bomb waiting to go off. The air/fuel ratio is WAY off.
Drop to a 68 jet and a 4.5 power valve and start tuning from there.

KP


dirtracer14
Member
posted August 17, 2003 12:40 PM
Ok now this thing runs like junk on the mid to top end....blubbers real bad ...tried more float level ...tried less still no diff.....what can we do??????


Earl Parker II
Member
posted August 17, 2003 02:29 PM
Check your PM.

------------------
Earl Parker II
www.parkercarburetion.com
704.482.7588


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