pamotorman wrote:
brasswell was selling those 15 years ago. you had notch the nytrophyl float to clear them if you extended the float out on the arm to get the same leverage as the brass float on the needle seat
That float was modified for a sideways application, not a different needle and seat. The bottom feed n&s that BLP sells are a drop in part.
the epoxy you see in the front center is to seal a notch cut into the float to clear the longer needle seat that uses a Q jet needle. yes it was used in circle track application so the float was angle cut.
The needle and seat isn't in front of the float, so the notch that is cut and sealed cannot be for it. The needle and seat sit near the pivot.
Mark Goulette
Owner/Driver of the Livin' The Dream rear engine dragster
Speed kills but it's better than going slow! http://www.livinthedreamracing.com
Authorized Amsoil Retailer
That float was modified for a sideways application, not a different needle and seat. The bottom feed n&s that BLP sells are a drop in part.
the epoxy you see in the front center is to seal a notch cut into the float to clear the longer needle seat that uses a Q jet needle. yes it was used in circle track application so the float was angle cut.
The needle and seat isn't in front of the float, so the notch that is cut and sealed cannot be for it. The needle and seat sit near the pivot.
I think its needed to clear the end of the power valve which sticks out from the middle of the metering block.
That float was modified for a sideways application, not a different needle and seat. The bottom feed n&s that BLP sells are a drop in part.
the epoxy you see in the front center is to seal a notch cut into the float to clear the longer needle seat that uses a Q jet needle. yes it was used in circle track application so the float was angle cut.
The needle and seat isn't in front of the float, so the notch that is cut and sealed cannot be for it. The needle and seat sit near the pivot.
you are correct I did not have my thinking cap on when I posted that. the brass float is cut back there for that reason
pamotorman wrote:
the epoxy you see in the front center is to seal a notch cut into the float to clear the longer needle seat that uses a Q jet needle. yes it was used in circle track application so the float was angle cut.
The needle and seat isn't in front of the float, so the notch that is cut and sealed cannot be for it. The needle and seat sit near the pivot.
you are correct I did not have my thinking cap on when I posted that. the brass float is cut back there for that reason to clear the PV
Moving the vent won't likely help with foam but easily can help keep bowl pressure consistent. Some hood and scoop designs can screw up vent pressure, sending AFR's lean as the car speeds up. Coming is volume pressure, more volume at low pressure creates less. Think of turning on an open hose into a bucket of water, then put your finger over the end to spray it. More pressure, more foam.
Mark Whitener
www.racingfuelsystems.com
____
Good work isn't cheap and cheap work can't be good.
MadBill wrote:Wouldn't the hood-mounted filter do that?
yes if you run the hood mounted filter but a lot of people road raced without them. I tried my 68 Z/28 with the thru the cowl cold air cleaner setup without the paper filter and had the same misfire till I installed the L-88 basket. this is the type if air cleaner setup I used. this is the Z-11 set up but the Z/28 was the same
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Ah yes, a lot of people assume the filter is a restriction, but not many verify it. A few years back I was tuning a 700 WHP SB2.2 in a Trans Am Series Corvette. After dialing in spark and fuel on a chassis dyno, we did an A-B-A removing the 3.5" x 16" filter element but leaving the case sealed to the cowl intake and gained..one HP with zero effect on the AFR.
MadBill wrote:Ah yes, a lot of people assume the filter is a restriction, but not many verify it. A few years back I was tuning a 700 WHP SB2.2 in a Trans Am Series Corvette. After dialing in spark and fuel on a chassis dyno, we did an A-B-A removing the 3.5" x 16" filter element but leaving the case sealed to the cowl intake and gained..one HP with zero effect on the AFR.
I believe doug roe Q jet book has some tests on air filters and their restriction. I know when at daytona qualifying slitting the paper filter with a razor blade made you go faster till NASCAR caught on. the forced air at speed is what causes the turbulence around the carb air bleeds
Wonder why Grump went to that much trouble just to vent the bowl , always thought it would be better after I saw it in his book years ago , pic from net
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Wonder why Grump went to that much trouble just to vent the bowl , always thought it would be better after I saw it in his book years ago , pic from net
looks like the original vents are plugged because they were allowing fuel to come out and get pulled into the carbs at speed
Wonder why Grump went to that much trouble just to vent the bowl , always thought it would be better after I saw it in his book years ago , pic from net
notice how the vents favor the front of the car and the needle and seats are positioned towards the rear to work with the sidehung floats.
the forced air at speed is what causes the turbulence around the carb air bleeds