So we are finished with paint and int, so its engine time. We are
going turbo or supercharger and would like the pros and cons of these 2 setups. My main question is how long will a weiand 8-71
last on a weekend street/race car. Is it rebuildable if it breaks?
Any opinions will be appreciated.

Edit: This will be a 400 smallblock build.

 

Do you have any idea how big an 8-71 is for a street car?

 

kinda like this

Id say go Turbo. but Im biased.

 

Id say Twin or Single Turbo..

 

Well it will be more race than street but I would like to cruise it through town.

I'm leaning towards turbo because it won't stick out of the hood,
but I think a blower would be more impressive at the car shows.
I'm lookin to get some trophies to help promote my body shop.

 

to me, nothing looks cooler than popping the hood and being greeted by a bunch of tubes that have been powder coated to coordinate with the car (intake side) and polished stainless tubes to compliment them colors (exhaust side)

 

Even still, a 4-71 would probably be more than enough. Many all-out race cars still use only a 6-71, not an 8-71.

 

You are correct the 6-71 is the one I have been pondering.
Is the 4-71 the single carb version.

 

Any of them can be single or multiple carbed, it just requires changing the top plate.

 

Thanks for the info. 2 more questions can you run the engine without a belt to the supercharger, and we saw a blower at a show and it looked like it did not have carbs. What was it using?

 

If it didn't have a carb on top, it would have some sort of multi-port fuel injection. On a street car this is probably the way to go since you can eliminate some of the height of the carb when you replace it with a throttle body.

The car won't run without the blower turning, unless there's some sort of bypass valve installed, which would be more of a "limp-home" system than anything you'd actually want to drive.

 

Do turbos cause extreme underhood heat? Still would like some more input. THANKS

 

I have heard of some horror stories of turbos getting extremly hot with the hood closed, although you can wrap them and do some things to cut down on heat, it will still get hot from the turbo

 

Not true. Just last week the blower on my 65 Chevelle locked up at work. I pulled the belt and drove it home. Only problem was total lack of power because you can't get a lot of air through a supercharger that is not turning!

Turns out one of the rotors started eating itself up. Maybe caused by over tightening one of the mounting bolts.

 

Without a belt it will freewheel, if it’s not locked up it will actually accelerate with increased airflow and even make a blower wine like it’s still working.

Some setups used a mechanical injector, usually a thin, flat plate mounted between the scoop and the blower. Kinsler and a few others have made these setups work with efi which is pretty freaking cool.

Unless you’re really good at packaging the blower will probably be less of a hassle to maintain and drive on the road, although turbos have their own coolness factor… If it’s a showpiece there isn’t much more attention grabbing then a big, detailed blower poking through the hood, and that would give tons of opportunities to show off your skills, more so then a snakes nest of plumbing under the hood (this is coming from someone that in most cases prefers turbos)

 

If you ask me, roots blowers are all looks. They arent that good. And you see them all over. When you have a turbo on a V-8, alot of poeple are impressed. I'd would rather see a turbo thirdgen than a blown third gen. Just my .2

 

This is what worries me about turbos i'm afraid it would mess up my paint.

 

Back to an earlier question is it rebuildable or are you just screwed if it breaks?

 

They can usually be rebuilt unless the case itself gets scored.

 

I think that around here people are a lot more interested in seeing turbos, but the fact is that in general, nothing stops people like a big honking blower sticking through the hood. The blower attracts attention no matter what you do, and will get people to stop and look, where people have to stop and look before they see the turbo setup.

 

i would much rather see a blower sticking through the hood, but the only thing that wories me is that with thirdgens the motor sits at a slight angle, i dont think that would look right.

could u just order 2 right/left side mounts to make it sit evenly in the car???

 

maybe you have retarded mounts, but mine sits just fine in the bay. sounds like you may have a worn out rubber mount on one side.

 

no everything is new, i heard it was normal for it to lean slightly to the passenger side


https://www.thirdgen.org/techbb2/sho...ight=hole+hood

scroll down to the camaro with the hole in the hood

 

just remembered, i'm running moroso solid mounts. mine sits right in the middle.

 

More questions, At what point do turbos and blowers start making boost? What is better for an 1/8 mile car? What makes more torque?

 

Anybody? Come on I'm a bodyman not an engine guy so any help would be great!

 

a blower normly gets into boost sooner but with the rite converter and useing a T-brake you could have lots of boost at the line.

A blower "should" be ezer to set up...

I have a little turbo on my car,... just got it running tonite

 

A properly built positive displacement blower will have boost proportionate to throttle position and load, so you could just about have full boost at any rpm assuming you give it enough throttle. A turbo needs sufficient exhaust gas to spool the turbo and enough time for that exhaust gas to overcome it’s inertia, the faster the turbo is set up to spool, the sooner/worse the restriction the turbine ends up being.

 

BLOWERS! those look way hotter in my opinion. That is the way i'd go if i had the $$

Muirner

 

I really like my roots blown big block:



Instant boost and tire frying torque right at the hit of the throttle. Very easy to access the spark plugs (and other important things). Also easy to set-up, tune, and no underhood heat problems.

 

^^^^^^^^^ That is beautiful ^^^^^^^^^

Muirner