Weiand Supercharger gathering dust...Time to put it on LSx Torque Monster?
 

I have a like new Weiand 144 blower (the small one) for a SBC and Vortec Heads with the intake.I probably won't put together a SBC again.Going to put together a motor for low RPM towing,maybe 6-8 lbs boost.For decent mileage too.I have a tired LQ4,probably looking to build a fresh one or find low mileage engine,but figure I'm going to need forged pistons anyway,so leaning toward a fresh motor.If I go with a blower I'm sure a 5.3 would be fine.

I'm talking torque here,nothing else,never to see 4000.The small blower should be good for that,should make boost off idle.

Anybody do this? I can fab,but need to draw the line somewhere.

There are roots style blower manifolds for LS motors. I've never seen one for anything as mall as a 144 though. Do a search here, you'll find them, but they are expensive!!!
Also, I'm not sure how well the older roots style blower seals would run dry. You might consider a TBI or carb to feed it.
http://www.blowerdriveservice.com/st...ck-p-1675.html
http://www.hawesengineering.com/pages/products.html

Well, obviously you will need to build a sheet metal custom intake base to accept the blower and have provisions for injectors/rails. Unless your gonna keep it a carb'd setup.

then I would think adapting the blower crank pulley to ls balancer would be the next obstacle. Luckily the 144/142 blower has integrated tensioner in the snout.

Can't think of anything else that may be an issue off hand. But that intake base will be the biggest custom fab.


Like to see this happen, because my last motor was a 350 with a 142 and it had tons of torque and was fun for about a month until I smoked a piston and then did a 5.3 swap. And I definitely miss the off idle power.

I really can't see the benefit or justification for going with anything other than a carburetor.I couldnt justify even thinking about any of this unless I already had the blower.

Before anyone brings it up,hood/cowl clearance would be no issue.

The strait vane rotors cannot be run dry or they will overheat and lock

Most weiand's are 6 rib, so the stock LSx pulley will be sufficient. The small blowers operate at 4-6psi, so you likely wont even have to pin the crank

Easiest solution is a dual quad carb intake, fab an adapter tub for the blower. Get a thick plate of alum, 3/4-1" thick and drill the sides for injectors. Mount a TB ontop of that and the plate/TB on top of the blower. The benefits of sequential injection go out the window, but it satisfies the requirements

None of the smaller roots blowers are intercooled and frankly, dont spin fast enough to need it

IMHO, a better route is to find a cobra M112 or GT500 M122, fab a tub and run port injection. Theres a BMW conversion running around with that setup. Low hoodline, efficient design, built for pocket change

If you can find a Whipple or Magnacharger base, you might be good to go:

Attachment 605859

Andrew

Hell I bet a MP90 off a 3800 could make 4-6lbs on a 5.3 or 6.0L. It would run out of air buy 5k but would be good for pulling.

agree with all points above by fry .I have seen threads with m90's fabbed onto ls1 & lt1 , I have sold tons of them from 3800SC series 2 part outs over the years , usually for around $100. One of my bosses bought a roush 427r stang and when he popped the hood I said that looks like an m90 case , looked it up sure enough... it will supply enough boost for the rpm your looking to use it for , its a great little blower

ive done been thinking of doing this before,,, they have the intakes on ebay for the 6-71 and 8-71 blowers,, all you have to do is find a good aluminum welder and weld up the places on top of the saddle part(base). them they have a paper gasket you can buy from summit for the 144 or 177 blower,, you also use the bigger truck pulley on bottom for more boost and they make the diff sizes of top pulley's too for the diff boost levels,,,, this would not be to bad to try if you have a tig and can weld aluminum.....

p/s you can offer them lower money for the base they will take less...

think these are the guys that sell them,, but they are a company that makes them
http://www.ebay.com/itm/Chevy-LS7-6-71-8-71-Fabricated-Polished-Blower-Intake-Manifold-/171429033400?pt=Motors_Car_Truck_Parts_Accessories&hash=item27e9f775b8&vxp=mtr

I put a M90 on a 5.3 and it made 4psi down low, and about 1psi above 5500~

IMHO, M112 is the smallest anyone should consider for a LSx

That is an attractive price, just not sure if or how well the rectangle LS7 intake would work on a cathedral port 5.3 head.
Also, I would be more than a little concerned about fuel distribution from a single carb blower with just a big open plentum.
I've had single carb 177 blowers on marine motors and even with the side by side intake ports and manifolds designed for that, I always jetted for the corner cylinders. I've seen several burned pistons on single carbed 250 equipped motors that was cured with the dual carb setup on the same blower.
I suspect a big open plentum would be worse with the separated intakes.
Probably not as much of an issue on a street car, but amplified a lot on a tow rig or boat.

Great Help Guys!
I wasn't expending too much help here.When I talk supercharger at the water cooler,most people think I must have screwed up the order form by not ordering the 6-71 blower,LOL!

Good to see that some folks understand the idea of low boost right off idle.

Hey Pocket,got a recipe for 450lbs of torque for a LSx....reliable,build it,set it,forget it,with a SC? Daily Driver.

A LS3/L92 topped 6.0 with a mild/moderate cam can do that easily without boost

The old maggy top mount kits are very reliable and can hit that on nearly any LSx engine with a decent cam and are relatively inexpensive

gary 68.... they make them for the cathedral port heads too,,,, ive done at one time was going to do this but use a 177 blower,,,, the 6 bolt blower top was a lot better to use for more clamping force.. ill go thu my old notes to find the place that makes them.. the main reason I didn't try this I would have to buy the blower, find a good welder person and fairly cheap, and buy the intake.. I could go turbo and get a better hp out of it than the blower for the money.

Yeah, the BDS in my link advertises for cathedral port.
The ebay one looks like a cheap Hawes knockoff.
But my main concern with a single carb blower and big open plentum manifold would still be fuel distribution to the corner cylinders.

This motor is going in a truck for daily driver and towing. Right now it has an LQ4, the power curve on it seems to be just about right I really don't rev it over 3000 rpm too much I want the next motor to live in the same rpm range mainly for mileage purposes. If I build a supercharged engine I'm considering a 5.3 to keep the fuel mileage about the same.I'm looking to keep the same power curve as the LQ4 just with bigger numbers. I'm assuming with the other motors that you suggest or a can the torque numbers will be better at a higher RPM range not really what I'm looking for.

These small factory SCs interest me because they were obviously built to be driven daily,not just by an enthusiast. I guess there are enough old timers building SBCs where I could unload the one I got to finance the new direction.

If I build a SC motor I'll build it to be 8 to 1 with forged pistons.If I do that I am all in...that kind of NA 5.3 wouldn't get the truck out the driveway.

Yeah so 450 lbs torque at 3500 would be nice,with good numbers right off idle.

I don't see the need for forged pistons or 8 to 1 compression for motor with only 6 lb's of boost. A LM7 would probably run fine at 6 lb's of boost with the stock 9.5 compression, but if you wanted to pay it safe you could use the 317's off your LQ4 and shave them down to 67cc's for just under 9 to 1 compression. Don't forget a motor with higher compression will generally get better gas mileage.

I thought I saw an ad that said those superchargers are rated at 450 horsepower. A 5.3 might nearly make that N/A. I wonder if that blower will move enough air for an LS engine.

what size pulley were you running on it ? stock ? I know its undersized for the application but the poster isn't looking for much boost and it is a compact durable easily adapted sc that can be bought for peanuts - heck run 2 of them seen that done also the 1 psi just doesn't sound right , I believe there would be a drop off at rpm but that sounds more like a boost control solenoid or boost bypass valve issue.

you also brought up the 112 , there is also the mp 112 which is the rotor pack out of a 112 used in an m90 with a spacer to allow for the larger rotor pack.

I don't think you'll come near 450ftlbs of torque even at a higher rpm. I have a roots blown LS based 408 and at 9lbs of boost it only made 600ftlbs at 4,000rpm. That's a 408 built for the blower with all good parts. ported 225 AFR heads, Custom FTI Blower cam, BDS intake and 16x55lb injectors.

It'll still make good torque but I don't know that it's going to be worth the cost to get it to work.