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Old 05-11-2004, 13:44   #1 (permalink)
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Dubbelpumper Or Secondry Vacuum

Good day all!! This is a wonderfull forum and I visit/read often. I am new and are from South Africa. The V8 era is long past in this country with only manufacturers BMW, Daimler Chrysler having V8's in some models. I bought a Fairmont GT 351C 4V Auto not so long ago and would like a bit more oomph without having to strip engine or heads. Someone advised a performer inlet manifold with 750cfm carbie. This is not a daily driver, I use it for my enjoyment and the occasional drag 4 or 5 times a year. I need to know:
1) Which manifld in Performer range: Performer or Performer RPM II
2) Which Holley carb 750with sec or mech vacuum or 750 dubbelpumper
3) Which eloctronic ignition and coil is suitable for this combination
Can someone provide the correct part no.s for me.
Any advise is happily received
Cheers vir eers (Cheers for now)
Daanp
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Old 05-11-2004, 14:35   #2 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

Quote:
Originally Posted by daanp
I need to know:
1) Which manifld in Performer range: Performer or Performer RPM II
2) Which Holley carb 750with sec or mech vacuum or 750 dubbelpumper
3) Which eloctronic ignition and coil is suitable for this combination
Can someone provide the correct part no.s for me.
Any advise is happily received
Cheers vir eers (Cheers for now)
Daanp
1: I'd probably recommend using a Weiand Xcelerator, which I feel is a bit better of an intake manifold than the Performer for a 4V application. An Edelbrock Torker is a good choice, too. (Provide more engine/chassis details for a better recommendation.)

2: I'd recommend a Holley 750 double pumper with a 4V engine.

3: I use MSD exclusively, but the Accel and Mallory parts are also worthwhile, especially if you want a vacuum advance part.

Most of the part numbers are available from jegs.com or summit.com for any part that is still in production. Use ebay for sourcing parts that are no longer in production.

:davis:
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Old 05-11-2004, 19:53   #3 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

I had a 750 vac secondary on mine, back then it made 270 rear wheel hp, i changed to a 750 double pumper and it went down to 265hp (this was 10 mins later)
But and it is a BIG BUT, i made a genuine 30 hp from start to top of the power curve more than the vacuum secondary until it tappered off 5 hp lower.
It completely changed the car, and was exactly what i was after.
Go the double pumper if you are racing it.
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Old 05-11-2004, 21:31   #4 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

OK more questions... If I go for the Weiand Xclrtr option how will height affect the bonnet and shaker setup. This is a ausie 1972 Falcon XYGt which SA import a few of back then. I woukd like to keep the existing shaker setup if possible, even if I have to mount the shaker on top of bonnet. The car is FMX auto with 2.75diff. How will fuel consumption be affected with such a change? Thx for advice.
Daanp
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Old 05-11-2004, 23:41   #5 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

Brenx uses a Weiand plus a spacer on his XB, he had to cut a hole in the bonnet for the air filter, i dont know if the XY is much different, someone here will know.
You need to change your diff centre to at least 3.5 if you want to drag (4.11 would be even better).
I also recomend the 750 double pumper and a good set of 4 into 1 extractors, with 2-1/2 inch twin pipes.
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Old 05-12-2004, 04:11   #6 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

It should clear the bonnet unless your going to use alloy heads with manifold spacers like I am.

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Old 05-12-2004, 05:28   #7 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

As for intake manifolds.i,m not aware of a performer rpm manifold for the clevo.The performer works to around 5500 rpm then power tapers off.If your intention is to rev hard as 4v.s like to do than you may want to consider something rather than the weiand excellerator.Whilst the 2v version is a great piece,the same cannot be said about its 4v counterpart.About the best dual plane 4v piece on the market comes from Blue Thunder from the US.I would prefer the Torker over the xcellerator (4v) anyday.alternativley look at other offerings from Parker,TFC or Active .
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Old 05-12-2004, 20:19   #8 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

Race-double pumper
Fuel consumption-Vacuum secondary.
With a double pumper the secondaries are vitually always open, and hence will use double the fuel.
With the sec vacuum, the secondaries only open when there is sufficient vacuum created by the engine, and hence only using the two primaries, alot of the time.
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Old 05-12-2004, 21:33   #9 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

Like TICK4D says...

Who wants to swap my nearly new 650DP for a 780VS ?
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Old 05-12-2004, 22:07   #10 (permalink)
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Re: Dubbelpumper Or Secondry Vacuum

No wheel stands then....
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