y-block wont rev over 2900rpm - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

fitz06 · 12-26-2006, 13:41

Hi people im from bathurst nsw, thought you might be able to help me. i brought a speed boat with a 292 which is direct drive to prop, it has a triple 3bolt manifold with repco elec fuel pump twin holley94s (middle hole blanked off) im haveing trouble geting it past 3000rpm pretty sure its the carbs. do you know how to set the floats and roughly how many turns for the mix screws when running twins. also there is a vac line from the dizzy to manifold, i was told the advance only works from carb vac not manifold vac and to plug them off. any info would be a treat mate. thx fitz 06 ps it also has small flat spots but it doesnt run rough

f700 · 12-26-2006, 15:50

hi fitz06 i have never play with three carb, s so i send to the best site for y blocks Ford Truck Enthusiasts, 1948-2007 Ford F150, Super Duty & SUV owners community and information source. Covers F100, F-150, F250, Bronco, Ranger, Explorer, Expedition, Lighting, Escape and More this may help they are good at that stuff,s
i have a 600 sq bore on my 292 that i can help you with

atec77 · 12-26-2006, 21:57

Quote:

Originally Posted by fitz06

Hi people im from bathurst nsw, thought you might be able to help me. i brought a speed boat with a 292 which is direct drive to prop, it has a triple 3bolt manifold with repco elec fuel pump twin holley94s (middle hole blanked off) im haveing trouble geting it past 3000rpm pretty sure its the carbs. do you know how to set the floats and roughly how many turns for the mix screws when running twins. also there is a vac line from the dizzy to manifold, i was told the advance only works from carb vac not manifold vac and to plug them off. any info would be a treat mate. thx fitz 06 ps it also has small flat spots but it doesnt run rough

94's ?
ok try starting the mixture screws at just over 11/4 turns each , you need a vacuum meter to set and blance, if you don't know how ring the local rod club and ask for help , you need the dizzy vac line connected UNLESS the dizzy has been modded ( but I doubt it) so hook it up to the manifold close to the base of a carb stand off on the log section for a consistant vaccuum . there should be a fitting on the manifold somewhere , get back to us and good luck

TCompton · 12-29-2006, 14:33

Glad to see this site getting some use.

Here is a site that has a lot of technical expertise. Though boating is somewhat different, I feel sure someone here or there can help.

TC
Austin, TX

Y-Blocks Forever

George1861 · 03-11-2007, 17:54

Get it reving? You are a bit under carbed. 2 94s give about 300-350 CFM (depending on what ones you have). It could use somewhere around 500 CFM. The 3rd 94 would get you there.

TCompton · 03-13-2007, 16:19

Are you able to turn more than 3000 w/ prop out of the water? Could it be too much pitch on the prop?
TC

Fordub · 03-14-2007, 08:58

Try this guy,
John Mummert is the best Y block guy int he world.
Welcome to John Mummert's

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cjperformance · 07-15-2007, 04:42

some of those motors ran in reverse direction for marine use( common to mercruiser gear from that era) if someone has used a normal dissy without locking the advance, it will never go over 3000rpm. just something to check. (i'll admit i got caught by it once!) if all set up ok, only 2 of those carbs will work fine, you'll just get more power with 3 of them. cheers