blower carb tuning HELP
 

Hello all over winter a have been searching the net and talking to fellow racers and have found alot of advice here so i decided to join first off im not a boat guy please dont hold that against me i am a drag racer i have a tube chassis altered body that only weights in at 1500 ibs FIRST drag racers frown on blown gas they seem to think if it has a blower it should be injected alky never get any help from them i see u guys make it happen so hope i can get help i like to be different and do things noone else normal does i am running a 427 sbc with dart pro1 heads dart block with 9-1 compression msd dist with msd 10 ign box tall manifold to clear regular dist a 14-71 mooneyham large opening turning 1:1 with adapter to accept three - 750 holleys pn#4779 mech secondarys four corner idle no power valves pro series aeromotive fuel pump damn big one all -10 and -8 fuel lines 30 degree timing 118 octane fuel use to run with 2- 750 on a 6-71 for years like that and was great switch to 14-71 and three carbs and been nothing but trouble it idles fine surges but dont matter to me sounds strong runs slow as hell acts like too much fuel i started with my old jetting of 88 squared and now down too 70 squared and still egts cold bout 800 degrees and still blowing black smoke and flames out zoomie pipes any ideas? more timing needed? how does 3rd carb causing rich condition? im afraid of going lean and burning it down been there done that any help would be greatly appreciated i tryed remembering to include all info but sure i forgot something thanks in advance tony

Your about 200 cu.in. small for that much carburation !!!! Being an x drag racer I have to ask why gas ? Alcohol is so much cheaper and much more tuneable . just saying

Im stubborn and have everythin to run on gas 118 fuel is 8 bucks a gallon so cost not much diff how bout using center carb for just air? the way i looked at it if i had two 1050s on a 14 71 that be better?

I have never seen any boat engine run 3 carbs and that includes 600ci + stuff. Like was said, you have way too much carb, especially for a 427.

you need to go to 2 carbs,and bump the timing up to 34 deg.with the right tune up,you can make good power with race gas.

Just takin fuel away from one out of question? Spent alot of time making that stupid adapter hate to see it scraped just askin tho dunno if adapter can be bought for large openin and really dont have the time to make another

I saw a boat in Key West in 1995 with 3 dominators with huge Wipples, 46' Skater with Arnesons, prolly had some huge cubic inch motors, so it has been done. 427 cubic inches you might try triple 600 cfm carbs.

Thanks for reply i was just thinkin an injector hat has more cfm than im using and in theory it would work fine gotta get it figured out sooner or later

Take 1 carb of and cover the hole with a plate . As for injector hat's they come in all different sizes as well . How much boost are you running with the 14-71 ? Just seem's way over kill for a 427 cu. in. Good luck

15lbs at 6800 rpm max

What is your a/f ratio wide open?

i have a 8cyl egt and they r in the 1100 range

No O2 sensor in the collector?

no just egt probes

An o2 sensor would be nice. Most boat guys don't run egt probess except on the dyno due to water jacketed exhaust. But if you are blowing flames out the exhaust something else is wrong. Is the blower swap the only thing you did from running good to flames out the exhaust?

the exhaust is 24 inch long individual pipe zoomies i switched from 6-71 with 2 750 holley to 14-71 with 3- 750 thinking the 14 would need more cfm do u think i should add o2 to end of one pipe? thx for help

It would sure help. I don't understand if you are blowing flames out the pipes why the egts aren't off the charts high.

thats what has me confused it idlea good and sounds good just acts like it never cleans out down track looking at o2 sensors now

I'd say you have something else going on like weak/broken valve springs. I use the Innovate LM2 af meter which per my research is the most accurate.

The flames in the pipes is raw fuel burning . I'll bet if you check the oil it will be loaded with gas. It's acting like it won't clean out because it won't . You are putting way to much fuel in it and it's just blowing the fuel out the exhaust .

rb tuning HELP, offshoreonly,offshoreonly.com,www.offshoreonly.com,offshore powerboat

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What is suggestions on carb sizing and jetting? Thx

Anyone know what would happen if i plugged outside four jets off?