Hi Guys,
Snowed in today..so figured I would stop in.
For a 632 we usually build them in the 1360-1600 cfm range BUT it varies with the weight of the car, converter, cyl head type etc... If you would, just fill out an online quote form off our website and I can get closer.
As far as the blow thru deal. There may not be any issues at all with the design. We just need to spend time dialing them in...time that Steve does not have and time I have not spent on the blow thru deal.
I sent two SV1s to Steve Morris for a 2200 h.p. deal when they first came out with a generic blow thru guess of a tune up. They idled and rolled in much cleaner than anything else...but the fuel curve needed work. They would move tons of fuel thats for sure.
They make lots of signal though and we bleed it off and use it to further improve atomization.
Our 1400 cfm SV1 typically uses 5 stages of emulsion, a 96 jet and a big .040 hi speed air bleed.
Most similar four barrels use a 100 to 102 jet and a 28 hi speed bleed.
But you gotta learn what it wants. It was no different than when I built the first one for a naturally aspirated engine. It took about 10 days on the dyno and there was just a mountain of booster and metering blocks we tried with various port configurations that we tested with to figure out what it wanted...we found it and then off it went.
It'll be the same way on the blow thru deal...you'll need to dedicate a week or two in a row on the dyno developing it and its ranges to get a feel for its needs and then once you get a baseline....off you'll go with various tune ups for various combos.
Its a project that needs to get done, but we need to find the time to do it and justify wearing out an engine to do the job.
So if you sell three of them...you wasted your development money.
Our R and D focus for the SV1 has been on the Naturally Aspirated and Nitrous contingent as most of the folks that use carbs are in those classes.
But you're right, the same theories do apply, it could be a hell of a blow thru carb.
Thanks.
Back on track for the thread: Joey Villeneuve picked up a tenth and 2 mph with his SV1
Patrick James
PRO SYSTEMS