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By DiLL - 4 Years Ago
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Looking for input about the Paxton SN-92. Is anyone using one currently? Are they reliable? What kind of maintenance/upkeep do they require? I’m guessing a different cam would be needed as well? Thanks for any input!
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By Cliff - 4 Years Ago
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Hi, I run a Paxton what would you like to know?
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By DiLL - 4 Years Ago
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Hey cliff! I’d like to know how reliable they are. I’ve never used any sort of super charger but from what I was reading on the great wide web a lot of comments lead me to believe that they have over heating issues and the bearings inside can seize up. Is this true? Have you experienced any of that? Also, what engine rpm are these designed for? Do they do well with pulley swaps and higher rpm? Do they require cams with less overlap and wider LSA? Thanks!
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By Buzz - 4 Years Ago
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https://paradisewheels.biz
Ive had an SN92 on my 56 CV for 10 yrs and had no problems. I highly recommend you have it serviced/rebuilt before installation. If you live on the west coast here's a reputable rtebulder.
I love the thing, I used the setup sold by REXHP.com
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By MoonShadow - 4 Years Ago
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I ran the McCullouch VS57 for years without problem. You do need to make sure the oil is full. They do tend to run hot but they are turning high RPM. There are coolers available that pick up the oil from the dipstick tube and pump it through a finned cooler. Sort of like a transmission cooler. Regular maintenance should keep it up and pumping. I ran one with G heads for a while and didn't see any problems with the higher compression level. You do want to have a set of posted heads. Ted Eaton has explained those on this forum and also showed how to post your own with threaded rod. Should come up with a search. I've switched to a 4-71 Supercharger for now. Little more boost but still civil on the street.
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By DiLL - 4 Years Ago
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Thanks for the reassurance Buzz, I’ll check out Rexhp. Moonshadow, I have a set of 113’s I’ll be using so good to go as far as the posts are concerned. I’ll look into the cooler mod! Thanks for the help fellas
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By Cliff - 4 Years Ago
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A SN-92 will run fine on a stock engine, however you'll have only a small amount of boost at low RPM, I see about 4 lbs at about 4500 RPM on most setups, there are a lot of up grades to get it higher and to come in sooner (at less RPM) this will require you to start up grading the engine.
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By miker - 4 Years Ago
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I ran a 92 on my stock 55 292 for several years. Ran fine with no engine mods, but I only ran 5 lbs at 5000 rpm. It was used, and it finally started to fail (never seized). I replaced it with an SN2000. Those both came from Paradise Wheels.
I had a 40 over 292 with one of Mummert’s stroker kits for 320cid. Mummert ported 113 heads, true 9:1 static, and his 270 cam. At 5 lbs/5000rpm I used a 2 degree retard at 2 lbs boost. Easy enough with the MSD in the car already.
I ran an Edelbrock 1406 carb, only modifications was the marine Accel pump kit and jets and rods. The Studebaker guys told me those were good for 10-12 lbs without sealing the throttle shafts. Worked for me.
It’s a fun modification, but it’s old technology. You feel the power increase, but it’s not in a league with more modern centrifugals like the Vortex/Novi.
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By DiLL - 4 Years Ago
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@ miker. Is the mummert 270 cam a single pattern or dual? How would more or less lobe separation effect the capabilities of the charger? Would the supercharger require less overlap to be effective? I’m ok with the old school technology. I’m not looking to to go drag racing just want a fun ‘old school’ street ride with decent power. So far I’ve got a .060 over 292 non ported 113’s with 1.92 I and 1.6 E. forged 3.3 crank, forged rods. Mummert DP intake, Will have to custom order pistons due to the rods being different. I’m probably going to use EFI as well just because I live in the mountains and feel like the elevation changes would be a tuning nightmare with a carb. Would 400-425 hp be attainable with the SN 92 and pump gas out of a 301”?
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By Cliff - 4 Years Ago
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The best blower for me is a SN series (short nose) back half with a VS57 (variable speed) front half, with this I get 10 lbs in the intake manifold (not the hat) and boost comes in at 1500RPM, I set the regulator to 10 lbs (about 5000 RPM), this out performs all the late model centrifugal blowers that I know of at low speeds. I don't think the ball drive can hold up much over 10 lbs, however I am now working on a VR 4 with a VS57 front end (not done yet), will see what happens.
https://www.youtube.com/watch?v=fJr7fFmbTwo
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By miker - 4 Years Ago
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Questions about cams need to be answered by someone who knows more than me. My point is a nice performing street engine will perform well with the lower boost. Just watch both the static and dynamic compression ratios. If I were doing it all over, building from scratch, I’d be talking to Cliff. The low rpm boost he’s getting would be a real improvement, but at 10lbs I think it’s going to be a purpose built engine.. I’ve been as high as 7lbs with positive displacement blower, but that was right on the line, premium fuel, ignition retard, and much enriched fuel curve. Much more modern engine, too.
If you go to much more boost you might want to sonic check the block. The 292 truck block I used limited me to 40 over due to a couple thin cylinder walls.
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