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#1
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Holley 50cc fwd acl pump
would changing to a 50cc fwd acl pump be beneficial for most performance applications using a dual plane intake?
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#2
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If you have a hesitation while accelerating and believe it is lack of fuel from the carb, then moving the 50 up front is ok. I did that while drag racing, but was fine on the street with the 30 up front and 50 in rear. Now with the smaller cam, I have the 50 in the rear of the carb ( 30 up front ) while racing. I use a dual plane intake.
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#3
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50cc will give you a longer shot. I also believe depending on the size of the nozel will depend on which you would use, 30cc vs 50cc.
Usually Dual plane manifolds do not need as large of a shot compared to a single plain intake. (smaller plenum)
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1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
#4
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Have you experimented with the pump cam any???
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#5
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Please note that with a Holley whenever you have reset the idle speed from where you had everything working perfectly, you then also need to readjust the pump spring and it’s clearance.
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I do stuff for reasons. |
#6
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The "30 cc" pump (per 10 strikes) works fine for most street applications on carbs up to 850 cfm. 3 cc-s for ONE carb stroke.
There is some benefit on a "Street Car", that is run on the track with an aftermarket converter, with the "50 cc" pump. 5 cc-s for ONE carb stroke. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#7
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My combo loves the 50cc pump up front. RPM or TII manofold. 850 dp annular boosters
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#8
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X2^
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1976 Trans Am Buccaneer Red 468ci, 10.5:1 CR, 87 CC RPM CNC e-heads, HR 282/288, 230/236, 561/.573 lift, Johnson Lifters & HS 1.65 Rockers |
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