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Old 02-14-2006, 11:13 PM
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sbc superchargers- which one should i use on my chevy 350

I would like to know if anybody has any information on which supercharger would be the best for my chevy 350. it currently has 300 hp but i want to boost it. what is the best?? thanks

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Old 02-15-2006, 09:38 AM
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You didn't provide enough info for anyone to help you. What type of supercharger do you want? What is your compression ratio? What are your goals? Do you already have a blower friendly cam in the engine? Forged pistons? How much boost do you want to make?

Royce
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Old 02-15-2006, 10:23 AM
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what year is the engine? Carbed or injected?
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Old 02-15-2006, 11:22 AM
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i bought this engine to drop into my camaro, im not sure of the compression ratio, but the cam provides a pretty smooth idle, i think it is one step above an rv cam. it is carbureted. I want it to be a weekend driver, and i am not sure what kind of supercharger i want, or the boost. with the engine at 300 hp i want it to be boosted to atleast 450. i am leaning towards roots, but am not sure. thanks everyone
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Old 02-15-2006, 12:56 PM
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Well your going to have to start digging and provide the rest of the info. Compression is going to be VITAL in your quest for boost.

Would also be good to know the cam specs, heads w/specs, etc.
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Old 02-15-2006, 05:09 PM
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Think really HARD about this, its going to cost ALOT!!!! trust me im finding out, the guys here are the greatest and can help you if your serious.

Heck I just spent $1000 on miscelanous at Summit

Duke
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Old 02-15-2006, 05:31 PM
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I am running a Weiand 142 on a 350 crate engine and it gave t a real kick in the pants. If your comp ratio is over 9:1 then you really should not concider it with a stock lower end. The 142 only puts out about 4-5 lbs of boost so it is not as hard on the internals as a 6-67 or 8-71 can be.


It would be a lot easier to give you more info if you give us more info to work with.
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Old 02-15-2006, 05:39 PM
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yes compression ratio is VERY critical!
as well as cam grind for the blower.
I used ti run an 8-71 on a 383 a few years ago and motor had 7:1 compression with 6 pounds boost ( that was max boost)
And another important tip is too make sure you bottom end is all forged.
theres alot of things to do to make a blower and motor function properly.
you just dont throw one on .
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Old 02-15-2006, 07:14 PM
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7:1 C/R and you could only run 6psi??? with that low compression you should have been able to run 9 or 10 psi easy.

Anywho, like the rest said you need to find out your C/R. cant do anything at all till you find that out. and depending on the grind cam you have you might want a new cam too....
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Old 02-15-2006, 07:17 PM
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hey tbucket23,
how much horse did your blower give you? how is the drivability on your car.
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Old 02-15-2006, 07:19 PM
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by the way everyone, how do you find compression ratio?
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Old 02-15-2006, 07:26 PM
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well... pull a head off and see if the pistons are flat, domed or dished. then get the head casting number and that'll tell you the cc's of the combustion chamber, and you can get an estimate from there. without tearing the engine down you do a compression test, then you take the cylinder pressure and put it into a formula. but, in my opinion its easier to do it the other way.
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Old 02-15-2006, 08:52 PM
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You can't get an accurate compression ratio by doing a compression check. Valve timing comes into effect when doing a compression test. The only way to know true compression is to measure everything. In this case that would be a lot of work. Do you know what year the engine is? Is it a bone stock GM engine? (bore, stroke, pistons). Chances are the compression ratio is not over 9:1 and you could "probably" get away with a mini blower and 4lbs of boost. 4lbs is about all you will want to run on cast pistons abd crank. That will give you decent power and should be safe. I really don;t personally think that is the best way to go about building a blown engine, but sometimes you have to work with what you have.

Before you spend a single $ on parts you need to know what's going on. I HIGHLY suggest you pick up a book called "Street Supercharging" by SA Designs, this will give you a good foundation to understand what you are trying to do and what it takes to do it.
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Old 02-15-2006, 11:02 PM
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I bought a Weiand 142 supercharger on whim one day and stuck it on an engine I've had in my Blazer for a while. I love it, it really woke up that 4800lb beast sitting in my driveway. Rice rockets wont stand a chance this summer when the top comes off and it sheds about 200-300lbs.
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Old 02-17-2006, 06:38 AM
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Quote:
Originally Posted by 81camaro350
hey tbucket23,
how much horse did your blower give you? how is the drivability on your car.
I have not had it to the dyno yet, I still have to do a little work on the carb to fatten it up under boost. I am in the North East so the car has been resting for a few months due to the cold and snow. I did get a chance to drive it a few times after installing it and I would guess it added 100 hp or so to my 330 HP engine. In my T-Bucket it made a huge difference in drivability, I definatly need a posi now.

My engine is very new, 1500 or so miles and the T-Bucket is so light that it is almost impossible to make it detonate. This will not be true in a heavier car.
Find out what you have and if it has a lot of miles and its a basic cast engine, you are flirting with disaster.
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