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motors running way too fat,

Old 05-03-2021, 05:26 PM
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Default motors running way too fat,

hello, looking for advice on why motors 547s are running so fat?? seems like they always have,,,some info
1050 holleys,,92 jets ,all round,,blocked power valves,,msd set up..
714 lift isky cam,,big valves, 14044861 bow tie heads,,motors are fresh..
cmi headers
buddy said i need air fuel set up,,,but how can i add in a wet exhaust system??
thanks


neede a hotter plug??
running r5671a-8 ngk v power


motors........


thanks...........
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Old 05-03-2021, 05:44 PM
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are you running stainless tails ? hard to see in the pic, if so you can have bungs welded into them, moving to a #7 might help
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Old 05-04-2021, 12:02 AM
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Were the plugs pulled after idling?? If so, you just need the idle circuit adjusted. Jetting has nothing to do with idle.
You need to check plugs after running at various rpms with quick shut downs.

Without an PV's, you're for sure going to be rich at some rpms
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Old 05-04-2021, 06:20 AM
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hello f2,,,trying to post photo or two...thought maybe i can get a air fuel sensor at very start of my straight pipe from header to exhaust tips at transom..,,,what are #7's??
thanks for advice

the black extensions are not stainless,,4 inch exhaust pipe ,,,,,maybe i can add air fuel sensenor right before the water bungs....
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Old 05-04-2021, 06:22 AM
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thanks griff,,,sounds like i need PV...will work on that..

thanks for advice..
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Old 05-04-2021, 07:12 AM
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A heat range 7 in the NKG plug would be a little hotter
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Old 05-04-2021, 08:38 AM
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Are they 2 or 3 circuit carbs? If they are 2 circuit you may need to jet down the transfer slot. Do you know what size idle jet is in them?
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Old 05-04-2021, 08:54 AM
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plug color is very difficult to read in a boat they look normal to me unless you run it hard then quickly shut off then wait for it to cool to even get to the plugs
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Old 05-04-2021, 12:48 PM
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hello ,,they are 12r-8795b holley 1050s...i dont know about transfer slot....all 4 jets are 92.

and dont know about 2 or 3 circuit carb...just know they are 8795"s...

sorry not that sharp on carbs


thanks for advice
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Old 05-04-2021, 12:49 PM
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Originally Posted by F-2 Speedy View Post
A heat range 7 in the NKG plug would be a little hotter
ok thanks speedy...
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