502 Cu in crate motor slight bog getting on plain at 1500 to 1600 rpm's
#1
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502 Cu in crate motor slight bog getting on plain at 1500 to 1600 rpm's
My set up is twin 502 cu in gen 6 big blocks crate motors 450 HP at the crank
Impco Exhaust and Exhaust tips.
Basically a stock motor.
I am running a duel feed 850 CFM Holly Carb as recommended by the crate motor spec sheet !
Plugs are a brownish but slightly more blackish color.
Once up on plane it runs really nicely!
My problem is getting up on plain I have a slight bog in both motors, at 1500 to 1600 RPM's , once I am past that slight bog it runs great.
The carb responds to adjustment, it idles nicely does not stall !
Fuel filters are fresh.
I do not know what jets come with the 850 cfm or if I have a jet problem at all ?
Any one have any suggestions on what to try ?
Thank you in advance for the reply !
Impco Exhaust and Exhaust tips.
Basically a stock motor.
I am running a duel feed 850 CFM Holly Carb as recommended by the crate motor spec sheet !
Plugs are a brownish but slightly more blackish color.
Once up on plane it runs really nicely!
My problem is getting up on plain I have a slight bog in both motors, at 1500 to 1600 RPM's , once I am past that slight bog it runs great.
The carb responds to adjustment, it idles nicely does not stall !
Fuel filters are fresh.
I do not know what jets come with the 850 cfm or if I have a jet problem at all ?
Any one have any suggestions on what to try ?
Thank you in advance for the reply !
Last edited by Big Boys Toys; 09-11-2016 at 11:27 AM. Reason: changed rpm numbers
#4
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have someone watch the tails pipes (if they can),I'm betting its a slight reversion problem.Had it once on my friends boat.could watch the water spray being drawn back up the pipe,same rpms as you.
#5
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iTrader: (7)
To OP. I'd put a vacuum gauge on it to optimize air screws and confirm you have correct PV while your at it. Like MT mentioned also but make sure your accelerator pumps are working properly. You may have to go up or down a discharge nozzle size also.