Pro-system SV-1 carb and nitrous tunning

Patrick is there any problem with anti-reversion with that big of a blade ?

Actually the booster design on the SV1 is not really subject to reversion. I imagine you could still work on reversion plates under the opening to see if you can redirect pulses if needed...that is an area that some manifold companies like MME and Wilson are testing right now.

But as far as making the carb rich, the SV1 is not really effected by reversion. Unless its REAL bad and then there is nothing you can really do about that...but fix the engine). But typical mild reversion is not an issue.

You see, on a 4150 or Dominator carb when air backs up and goes the opposite way past the booster it "double hits" the booster. Think of the air oscillating inline with the opening of the booster (this opening on 4150 and Dominator carbs is on the side of the booster and vacuum is created during both directions of this oscillation). This draws fuel out of the booster and makes it real rich during this oscillation. The lip on the booster edge acts as a "gurney flap" and makes some pretty good signal in the opposite direction.

The SV1 booster feed holes are out of the bottom (instead of on the side), so when reversion comes up it "stops the fuel" and it restarts instantly, as on the SV1 the fuel rests above the opening "waiting to respond" when the air changes back to the proper direction.

Thanks.

Patrick James
PRO SYSTEMS

Yes there is an Alky version. That surprised the heck out of us as ALKY carbs from just about everyone make the same amount of power. So our Dominator had a good decade of development into it to get ahead of folks and we really thought we couldn't beat it. The SV1 beat it on the second pull. What that did was prove the single blade/venturi layout is also responsible for making power. As atomization means nothing on alky so that SV1 advantage was gone. On average it was up about 8-10 h.p. and 8-10 lbs of torque over our Dominators. The fuel curve was identical, but atomization did come into play as once again the SV1 wanted to be leaner than a four barrel carb and once again it made more power with less fuel. Truthfully, this carb is just one surprise after another. Call CJ at SMRE (231.773.8150) some time and ask him about this carb....he does most of the dynoing lately (he is local to us so we use him when we need something tested quick). The engine just sounds so different and runs so smooth whenever we install one compared to a four barrel.

Patrick James
PRO SYSTEMS

I would love to have one of these carbs.. From what i have heard Pro systems is the way to go and Patrick James knows his stuff..


Whats up Lance

Patrick, do you have someone running this carb on a blow-thru setup yet?

New Era Racecraft dynoed the SV1 Blow thru carb on Thursday. Its a 572 c.i. Pro Charged street engine, the SV1 made 41 h.p. over a competitors carb at the same boost, both carbs jetted for max power.

The SV1 achieved 1572 h.p. on 91 octane pump gas. New Era states, unlike the competitors carb the SV1 rolled in the throttle... cleanly with a perfect fuel curve AND would idle comfortably at only 700 rpm! They were amazed!

Patrick James
PRO SYSTEMS