irocman88

so when i finally build my engine i was thinkin of throwin a weiand 144 on top. does anyone know what size blower cam would work? also, anyone know how to put an intercooler on a carburated supercharger?

Damon

With that blower you don't run an intercooler. Not unless you're into fabbing your own parts and building a complete water-to-air intercooler setup (similar to a Ford GT500, for instance). The fuel going through the blower provides some small amount of cooling, but if you want to get it real cold you put a plate nitrous system between the carb and blower- check to make sure you have enough hair on your chest before you try that, however.

I've got a fair bit of experience with those little blowers now and my experience tells me you want to keep the cam modest. High RPMs are NOT what you want to be shooting for. Small duration and wide LSA is what you want. Those little blowers are pooped out around 500HP. You need to use what little airflow they can deliver EFFICIENTLY. You don't want to be wasting precious boost straight out the exhaust and you don't want to spin the blower into an RPM range were it's efficiency drops off a cliff. Here's a cam I could recommend for street performance in the 2000-5500 RPM range....

http://compcams.com/Technical/Search...umber=12-552-4

If you want to lean a little more towards peak HP then go the next step bigger for something that will work from about 2500-6000....

http://compcams.com/Technical/Search...umber=12-556-4

You can find roller cams with similar specs as well if you want to go that way.

But don't go any bigger than that. You'll be trading away torque and drivability for no gain in horsepower with these little blowers. Been there, done that.

And don't freak out that these cams look small. They are small, but they're what a little mini blower wants. You get it done with TORQUE, not with high RPMs. My car never sounds like it's straining or spinning it's guts out (never goes past 6000) but it'll walk right away from a near-stock LS1 Camaro like he left the emergency brake on. It feels more like a mild big block than a small block when you lay into it, plus it's MUCH more docile and drivable than the same displacement/same horsepower N/A motor would be. High stall converters and steep gears are not required.

My combo puts 390HP to the rear wheels at 5500 RPMs and somewhere north of 420 torque (spikes well past 500 ft/lbs, but that's in the very low RPMs and on the shifts where you're getting into torque converter and gear change dynamics that don't give a true indication of what the motor itself is making). I'm only using a little 214/224* cam on a 112* LSA. My dyno numbers were almost dead on top of what a stock 450HP Viper V10 put to the rollers on the same day/same conditions. But I'm doing it through a less efficient automatic transmission, so I claim about 470 REAL horsepower from the combo at the flywheel AS ACTUALLY INSTALLED IN THE CAR, including full exhaust, all accessories spinning and sucking air through the same air cleaner setup I un on the street.

irocman88

hey thanks alot for the info man. much appreciated. sounds like a mean car you got there. what kinda times do you put down with that setup?

also, would this cam work? or are there differences in other things besides lsa, lift, and duration? like ramp rates maybe? http://store.summitracing.com/partde...5&autoview=sku

not tryin to go cheap, just that cam is already in my engine. it has been since i bought it.

Damon

That might be a smidge too big. I used a 224/230* cam on a 114* LSA (Comp XE 268 ground on a wider LSA) in my previous motor and it was borderline too much- gave away a little torque for no gain in peak HP and the around-town manners weren't as good- idle in gear "rolled" slightly, too.

If you want to use a Summit house brand cam you might want to get the one I use in my current motor: SUM-K1103. It's 214/224 on a 112* LSA. I combined it with 1.6 rockers (due to the modest ramp rates on Summit house brand cams). I bought it cause it's cheap, too. Works just fine- spins good up to 6000 although the HP curve is flat above 5500. No real reason to go much bigger with the small blower, in my opinion.

When id dou8bt, buy the next smaller cam than the one you think you need.

irocman88

alright awesome. thanks again for all the info man.

Sonix

iTrader: (1)

Hey Irocman88 - got any times or numbers on the current motor as is? I've got a similar build and want to know where I'm around.

irocman88

it's funny you ask. I don't have any times as is. never had a chance to get to the track last season. But I am in the process of getting it ready for the track on friday. When I get back I'll post up some times. I need a new distributor though for real good times. I think my rotor's kinda shot.