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Metering Block Options???

Posted By: 6bblFLASH

Metering Block Options??? - 12/17/12 12:02 AM

Looking to try different metering blocks on a HP950 "copy" carb.
Basic issue is WOT AFR. Goes to 13.0 AFR at the hit of the throttle no matter the jet and stays there.
Borrowed a HP-950 Holley and AFR read 11.8 at the same WOT checks.
Been althrough the thing. Tuned it to 14mpg/idles drives perfect ,but WOT cannot be adjusted.
Need a new carb.,,, but hope just metering blocks will do it too?
What metering blocks are decent at a reasonable cost?

Attached picture 7506012-DSC01026.JPG
Posted By: AndyF

Re: Metering Block Options??? - 12/17/12 12:40 AM

Bo Laws is a good place to go for metering blocks.
Posted By: Cab_Burge

Re: Metering Block Options??? - 12/17/12 05:10 AM

Quote:

Looking to try different metering blocks on a HP950 "copy" carb.
Basic issue is WOT AFR. Goes to 13.0 AFR at the hit of the throttle no matter the jet and stays there.
Borrowed a HP-950 Holley and AFR read 11.8 at the same WOT checks.
Been althrough the thing. Tuned it to 14mpg/idles drives perfect ,but WOT cannot be adjusted.
Need a new carb.,,, but hope just metering blocks will do it too?
What metering blocks are decent at a reasonable cost?

Find the problem, fuel feed restriction, and fix it What size needles and seats are in your copy cat HP950?
Posted By: mopar dave

Re: Metering Block Options??? - 12/17/12 05:16 AM

BlP metering blocks.
Posted By: 6bblFLASH

Re: Metering Block Options??? - 12/17/12 11:24 AM

Quote:

Quote:

Looking to try different metering blocks on a HP950 "copy" carb.
Basic issue is WOT AFR. Goes to 13.0 AFR at the hit of the throttle no matter the jet and stays there.
Borrowed a HP-950 Holley and AFR read 11.8 at the same WOT checks.
Been althrough the thing. Tuned it to 14mpg/idles drives perfect ,but WOT cannot be adjusted.
Need a new carb.,,, but hope just metering blocks will do it too?
What metering blocks are decent at a reasonable cost?

Find the problem, fuel feed restriction, and fix it What size needles and seats are in your copy cat HP950?



Has .150 N/seats in it,used my fuel-bowls and lines on both. I think its more the fuel curve than avaiable flow
Posted By: BradH

Re: Metering Block Options??? - 12/17/12 06:39 PM

That's not the best picture... what brand of "copycat" metering blocks and main body did that carb come with?
Posted By: oldtimer5151

Re: Metering Block Options??? - 12/17/12 11:53 PM

The .150 seats are for alcohol. The largest gas is .130 with viton rubber tips.
Posted By: 6bblFLASH

Re: Metering Block Options??? - 12/18/12 02:46 AM

Quote:

The .150 seats are for alcohol. The largest gas is .130 with viton rubber tips.



Yep! Tried`em anyway. No improvement
Posted By: 6bblFLASH

Re: Metering Block Options??? - 12/18/12 02:47 AM

Quote:

That's not the best picture... what brand of "copycat" metering blocks and main body did that carb come with?


Have no idea,they are pretty coursely machined.
Found shavings inside too............
Posted By: Thumperdart

Re: Metering Block Options??? - 12/18/12 03:51 AM

Quote:

Quote:

That's not the best picture... what brand of "copycat" metering blocks and main body did that carb come with?


Have no idea,they are pretty coursely machined.
Found shavings inside too............

I`m not a fan of frankenstein carbs myself and always had better luck w/a matched unit and tune from there..............good luck either way.
Posted By: dogdays

Re: Metering Block Options??? - 12/18/12 07:38 PM

The supercharger is sucking so much air that the power valve stays closed. It's been an issue for others before, may be for you too. That's my guess.
R.
Posted By: 6bblFLASH

Re: Metering Block Options??? - 12/19/12 12:03 AM

Quote:

The supercharger is sucking so much air that the power valve stays closed. It's been an issue for others before, may be for you too. That's my guess.
R.




Power-valve is boost referenced,also tried with and without power-valve+8jets.
I`ve run from 84`s to 99`s still AFR of 13.0
Posted By: oldtimer5151

Re: Metering Block Options??? - 12/19/12 12:24 AM

Try raising the carb by installing spacers under it. This will move the carb up maybe not up setting the carbs signal.
Posted By: dogdays

Re: Metering Block Options??? - 12/19/12 05:31 PM

Then I've got nothing.
R.
Posted By: BradH

Re: Metering Block Options??? - 12/19/12 05:35 PM

Quote:

Quote:

That's not the best picture... what brand of "copycat" metering blocks and main body did that carb come with?


Have no idea,they are pretty coursely machined.
Found shavings inside too............


If that's a ProComp-based copy, it could be either the metering blocks or the main body having restrictions in the fuel passages.

Try Holley metering blocks w/ the current main body to see if that cures the problem.

If the metering block swap doesn't fix it, it could be something like the downleg boosters haven't been sized properly to flow enough fuel for your use.

My (and I know it's easy to spend other people's $$$), is to sh!t-can the Horrey calb and put a proven unit on it, rather than expend any time & $ trying to band-aid the offshore parts.
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