Car Forums  

Go Back   Car Forums > General Discussions > General Chat
FAQ Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-17-2008, 12:47 AM   #1
carls47807
CF Freak
 
Join Date: Mar 2005
Location: new york
Posts: 582
corvair/firebird conversion

So, I bought a wrecked 93 firebird and I want to put the drivetrain in a corvair convertible (I have both cars, this isn't bs). I am very familiar with bots cars, particularly the corvair. There are a couple of questions I have that I would like some input/answers on. First off, I am going to put the rear axle from the firebird in the Corvair, that shouldn't be too big a problem (the firebird was hit in the front. I am wondering what my best move for the front end would be. I could use the stock sub frame from the corvair, and use conventional steering (non power), and beef up the stock springs, or I could do a subframe swap from the firebird, which could be a lot of work. Of course, then the struts and everything would be set up to handle the wait automatically.

Secondly, I will have to tunnel the corvair, which is unibody. Has anyone ever tunnelled a car before? Will I lose the structural integrity of the car (since it is a convertible?). I plan on keeping as much on the Corvair as possible, and I want it to look like a corvair when I'm done. I'm going to start this project in a month or so, and I'll be posting pics as I progress, I think that would be interesting and fun for everyone, including myself.

The Corvair will have a 3.4L 5 speed drivetrain (I want it to get roughly 25mpg, so I don't want a v8, and I dont' think it could handle it). Why am I doing this, because I already restored a corvair and it's not everything I expected.
carls47807 is offline   Reply With Quote
Old 03-17-2008, 05:49 PM   #2
dvdrose18
CF's resident Nurse
 
dvdrose18's Avatar
 
Join Date: May 2006
Location: Northeastern NJ Needs: A Life
Posts: 513
If you are putting the engine in the front of the corvair, my biggest question is if the new engine bay will handle the torque of the engine. The location of the engine mounts would need some careful planning, and as you mentioned, the suspennsion would need major help. As far as the tunneling goes, I don't think the actual tunneling would be a problem, as the creation of a tunnel would actualy make it stronger if done properly, kind of like an I-beam. stand it on end, and it is hard to bend up and down, but if you lay it falt, it bends easier. Again, I think the biggest problem will be torque, with the engine in the front, and the drive axle in the back, all the torque from the engine will have to transfer through the length of the car. Hopefuly most of this will be acomplished by the drivetrain, but I would expect things to twist differently.

I think it would be more interesting, and easier, if you could somehow leave the engine in/near the rear.

Quote:
Originally Posted by Wikipedia
V8 Corvairs
The ultimate Corvair modification was replacement of the engine with a V8. As daunting as this might seem, two things made it possible:

-The Corvair engine rotated in the opposite direction from most other engines, so that if a V8 was placed in the rear seat area (the added weight of a V8 in the original location of the Corvair engine would be abominable to drive) and coupled to the front of the transmission via a supplied custom made clutch gear and input shaft, this would drive the car in the proper direction with four speeds forward and one reverse.
-The switch in 1966 to using standard Chevrolet Saginaw gear sets in the manual transmission could handle the torque of a V8.

A radiator occupies the former trunk, in the front of the vehicle. However, the former engine compartment in the rear now is available as luggage space. A complete kit to adapt a Chevrolet small-block V8 to a Corvair was manufactured by a company named Crown Manufacturing, for $600. The resulting vehicle weighed only 2,750 pounds (1250 kg), compared to 3,700 pounds (1680 kg) for a small block Corvette, and possessed independent rear suspension of almost the same design. Crown's prototype with 350 hp (261 kW) Corvette engine recorded an elapsed time of 12.22 seconds and 105 miles per hour (169 km/h) in the quarter mile (402 m). An advantage of this modification is that the mid-engine design provides optimal handling characteristics for the road, as well as excellent drag strip traction without the need for slick or "cheater slick" tires as seen in front engine cars, let alone modifying the wheelbase as on the FX funny cars of the time. Although a few Corvairs have been modified to accept the Chevrolet big-block engine, the added size of the engine makes the work significantly more difficult, and the result, although a great performer, tends to be unreliable. Yenko Corvair YS99 was one of the 300 or so CORV8 conversions made. It is also possible to install a reverse rotation small block chevy in place of the flat six with many modifications.
__________________
dvdrose18 is offline   Reply With Quote
Old 03-17-2008, 06:12 PM   #3
carls47807
CF Freak
 
Join Date: Mar 2005
Location: new york
Posts: 582
My friend did a corv 8, and they are really noisy, and you lose the back seat.

http://www.corvaircorsa.com/V-12-01.html

This guy ran a v12 with a tempest driveshaft, so I think the body can handle the torque. He used the corvair subframe too, but he beefed it up some. I'm not sure I have the engineering know-how to do this.

I wanted to do firebird drivetrain because it is paid for and I got it cheap. I want a good driver that gets good mileage, and that is different from what everybody else has.

Thanks for the reply. So tunneling the body could actually make the body stronger, maybe that could help with torque problems too.
carls47807 is offline   Reply With Quote
Old 03-22-2008, 01:36 PM   #4
dodger65
I know more than Wally...
 
dodger65's Avatar
 
Join Date: Apr 2005
Location: U.S. - Midwest
Posts: 2,117
if you're going v6, why don't you just get a fwd engine/trans combo out of a late model gm? much more power, better packaging, better mileage and just plain simpler... maybe something newer w/ a 3400/3500 or even an older 3.4 dohc...
__________________
"Everyone is someone else's weirdo"

dodger65 is offline   Reply With Quote
Old 03-23-2008, 06:07 AM   #5
carls47807
CF Freak
 
Join Date: Mar 2005
Location: new york
Posts: 582
and put it in the back? or the front?

I like the idea of putting it in the back, makes things a lot easier.

I have the firebird, bought and paid for, and I like to waste time and attempt impossible challenges (for me), that is basically why I am hell bent on the firebird setup.

You think FWD (in the back) will get better mileage than this RWD setup?
carls47807 is offline   Reply With Quote
Old 03-23-2008, 04:14 PM   #6
dodger65
I know more than Wally...
 
dodger65's Avatar
 
Join Date: Apr 2005
Location: U.S. - Midwest
Posts: 2,117
in the back...

well, i know that the later fwd motors are more powerful and more efficient (i'm actually doing a fwd head conversion on a 3.4 firebird motor right now) and i'm of the opinion that if you're not going to get really radical w/ power or the "wow" factor - like an ls1 or something, it's going to be an awful lot of work for less power and efficiency and really a kind of ordinary motor...
__________________
"Everyone is someone else's weirdo"

dodger65 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Forum Jump



All times are GMT +1. The time now is 11:58 PM.

Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2002 - 2011 Car Forums. All rights reserved.