Anyone running zoomies run evac system? Was told by former member that 5 and 8 worked best,

Wondering if any have dumped vacuum pump and went to pan evac setup? If so see any performance difference?

Thinking less crap to break. Remove pump, belt drive pulley, catch can, two hoses. More room for working on engine. Hell of lot easier to get ratchet on front for doing valves. Also easier to get into oberg to clean filter. Plus how much power am I really gaining without proper ring setup to maximize setup?

My opinion total waste of time. On Zoomies it will not matter what tube you put it in because each cylinder is about the same and separate from all others unlike collectors.
You will not pull much if any vacuum like that. And even if you could get 3 or 4 inches of vacuum that is not enough to help much.

I run 16" to 22" inches of vacuum on my motors. Do you even know how much vacuum you are pulling? Most people do not know. They are difficult to get sealed up good but worth it when you do and start pulling good vacuum.

In fact you will probably make more horsepower with collectors than Zoomies. So if your goal is horsepower dump the Zoomies and get collector headers and vacuum pump. Pick up 50 or 60 Hp. Not only that the collectors will make more torque and mid range power so the ET will more than just the power difference alone.

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Anyone running zoomies run evac system? Was told by former member that 5 and 8 worked best,

what are you talking about 5 & 8 if o2 sensors i run zoomies and have them on 5&6.the better way is to install a sniffer tube tied to all tubes.i do currently use a vacume pump and carry aound 8 to 9 inches in 1/4

The vacupan deal was never about vacuum numbers.
It was more about not having thin aluminum valve covers leak everywhere.
It's a siphon deal via the exhaust speeding by the vac tube. It ceases to be useful above 500 cubes.

WO231, If you are not making back to back to back laps would not a puke tank suffice for your needs?

FWIW I haven't seen a lot of B****in about vacuum pump reliability.
They are pretty much a must have with modern skinny ring widths and diesel range compression ratios.

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Originally posted by rusty:

quote:

Anyone running zoomies run evac system? Was told by former member that 5 and 8 worked best,

what are you talking about 5 & 8 if o2 sensors i run zoomies and have them on 5&6.the better way is to install a sniffer tube tied to all tubes.i do currently use a vacume pump and carry aound 8 to 9 inches in 1/4

I believe he is talking about putting the old style crankcase one way check valves in Zoomie pipes 5 and 8.

( I do not think he is talking about O2 sensors)

Dave Koehler, I absolutely agree with you on vacuum pump and vacupan deal. The vacupan deal is nothing more than a one way pressure valve to let some crankcase pressure out. Do not think it can pull much if any vacuum. Only way I would consider using vacupan type deal is if rules stated you can not use a vacuum pump.
The vacuum pump makes horsepower and stops oil leaks when motor is sealed up good.

pizzin in the wind comes to mind

Not trying to pull high vacuum. Do not have thin ring setup and compression not that high. I know one of the guys I sold some zoomies to ran same deal on his roadster, he no longer on site and loss his number. He said they had found out 5 and 8 worked best with zoomie deal.

Never said issue with vacuum pump. Just seems another not have to have piece.

Puke tank is thought, Would be better if could run in rear and thru chassis but with openings for cables and some tubing in main rails it would have to be in front of engine.

Besides most run vacuum pump and thin rings for more power and according to most here that not important for a car run in bracket race, Well until they want to build new 632 with 5000 dollar induction system, Then It is needed and must have thing.

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Originally posted by wideopen231:
Not trying to pull high vacuum. Do not have thin ring setup and compression not that high. I know one of the guys I sold some zoomies to ran same deal on his roadster, he no longer on site and loss his number. He said they had found out 5 and 8 worked best with zoomie deal.

Never said issue with vacuum pump. Just seems another not have to have piece.

Puke tank is thought, Would be better if could run in rear and thru chassis but with openings for cables and some tubing in main rails it would have to be in front of engine.

Besides most run vacuum pump and thin rings for more power and according to most here that not important for a car run in bracket race, Well until they want to build new 632 with 5000 dollar induction system, Then It is needed and must have thing.

If you are not trying to pull vacuum then why put pan evac valves on it at all? If it not pulling vacuum what does it matter what cylinders you put them on?

Running puke tank in chassis with holes for cables and some tubing in main rails? So building a leaker / track oiling system?

It is not only ring package that makes vacuum pump work, the vacuum pump helped long before they got the thin ring packs. Maybe the vacuum helping to pull the piston down instead of it having to push and compress air on down stroke? Do not know or care the vacuum pump helps make power and stop oil leaks. That is enough for me. I have seen power difference on the track and on the Dyno with vacuum pump.

If you are dead set on getting rid of vacuum pump and going to pan evac with Zoomies then why not do all 8 cylinders? 2 of them will not move much air, they can't because of small orifice and tension on the check valve. 500 cubic inches swinging around in the motor moving air up and down and those little check valves are about 1/4" inside diameter and 2 of them is going to remove pressure? 8 of them may do a little more than nothing. Still if they worked we would still be using them, absolutely nobody uses them unless rules state no vacuum pump. There is a good reason for that. They do not do much.

Something else to think about, say you have a 500 Cubic Inch motor, each cylinder is 62.5 cubic inches. When you have Zoomies each pipe is individual and not in any way dependent on other pipes.

So it does not make ANY difference what pipe you put them on. None what so ever. And they do not do much anyway so even if they did there would be no way to know which pipes did less.

It does when you think along lines of cylinder firing order and spacing alternating sides.

Did not ask which cylinders to use. Asking if anyone ran the combination. Will see soon since cooled off and can gat back out for next cpl weekends and play some. Figure if works fine then great if not its not like bunch of money spent or any big changes.