Any one up on Chevette/H bodies?
 

To make a long story shorter, I was able to pick up a 1980 Pontiac sunbird formula hatchback rather inexpensively. It came factory with the iron Duke and a 3-speed automatic. The whole top end of the motor is gone only the block remains. Of course, everyone has their opinion on what the replacement engine should be. I used to have a very nice rust free 75 Chevrolet Monza hatchback that someone had put in Isuzu diesel in it. It had oil leak issues and other things going on, and I kind of needed to sell that car anyway. The person that bought it couldn't wait to get it home and like put a 350 in it. So now here I am, years and years later, and fuel prices are absolutely insane here in Washington state and I'm sure it's not likely to get any better. So, I went out and bought a 1984 chevette diesel that has the 1.8 Isuzu with a manual 5-speed. I would like to swap that into the sunbird, and just wondered if anybody had experience with how the full pedal setup might be way different. I can understand where the accelerator linkage might have to be custom cobbled up? I am hoping that once completed, I could sell the decent two-door chevette shell to somebody who wants to drag race or drift etc. I don't think they're too many forums dedicated to chevette's, not much love towards Chevettes. It kind of looks like both the sunbird and the chevette have a torque tube type of drive shaft arrangement? Any experts out there? I was pleasantly surprised at how well the chevette accelerated in the pre-purchase test drive as compared to a Mercedes 240D and some old Volkswagen quantum wagon I used to have. Though the sunbird is a little heavier than the chevette, I plan on putting a fiberglass type front end on it, and maybe fiberglass doors and rear hatch as well. I welcome your comments, opinions, . The chevette even has a tilt wheel! I was not expecting that at all! When completed I certainly would like to see at least 50 miles per gallon. The longevity of the 1.8 I've read is pretty remarkable. The bottom end of this engine has been completely rebuilt. Yes I still like my insight, and I picked up another 87 Honda CRX, but I've always liked the h body hatchback body style especially how the roof line looks. So I just want an easy going cruiser that's looks a little different than everything you see out there everyday.

Agreed on the 1980 Pontiac sunbird hatchback body. Post a pic for the lurkers. I like it for the sweep on the bottom of the Daylight Opening. It's a nice reflection of the roofline.

It seems comparable to my 1979 VW Dasher diesel. It was good for 45MPG. The only thing I didn't like was the rough idle. The whole hood shook at traffic lights.

What do you plan for wheels? Why not 19s with BMW i3 tires?

Probably stay w snowflake Wheels or the cosworth type mags.Love to share picture,but am challenged.

Not sure what are those. I was just noticing the wheels on KITT, the TV car

https://external-content.duckduckgo....434&ipo=imageshttps://external-content.duckduckgo.com/iu/?...&ipo=images

Those appear very aerodynamic. Would they bolt up?

I still see a reasonable amount of Chevettes, daily-driven, but none is Diesel.

50-mpg HWY Chevette
 

I had an '82 model, and had progressed as far as cardboard mockups at the time a Southwest Airlines stewardess decided to dive her Rabbit through it, running a stop sign.
So I never got to find out.
Dr. Gino Sovran, of GM Research Labs had published an SAE Paper outlining the aerodynamics that would get a Chevette to over 50-mpg at the old double-nickel national speed limit.
I think it's a no-brainer.
Ironically, it was on a Southwest Airlines flight where I first saw the CIVIC CRX HF, which I immediately got on the list for, and bought within a month.
It was the 49-state car, with lower gears, and only good for 52-mpg, which would ultimately get over 65-mpg as Spindletop.

That is a blast from the past. Growing up in Michigan there were a lot of kids in my high school driving Chevettes in the early 90's. (or as we would call them vettes as no one in my working class neighborhood was making enough money to buy their kid an actual Corvette for their first car)

It has been more than 25 years since I've wrenched on one so I can't help with the pedal question but your post brought back some memories. I also don't know how much the H-body and T-body overlap.

For those that don't know this is what Larry bought. (I think Pontiac missed the target audience with this ad)
https://static1.hotcarsimages.com/wo...&w=750&dpr=1.5

Didn’t the Chevette convert to FWD about that time (1984)

I remember the FWD Diesels were the most efficient.

Considering the bell pattern almost anything should mount in there, sadly exhaust and motor mounts will suck . Linkages will always need customization


Good lord
https://www.cobaltss.net/forums/gene...hevette-96025/

The Sunbird switched from the RWD H-Body to the FWD J-Body platform in 1981.

The Chevette was built on the RWD T-Body platform and was made from 1976 - 1987 in the USA. It continued on for Latin America until 1998

Thanks for sharing the picture. Yes those are the snowflake Wheels. I once had a driving job for a bank and had to drive my supervisor between two different Bank branches
In the bank fleet were Vega wagons couple of Nova sedans with 350 v8s and a couple of lowly chevettes that were automatics. I was prewarned by other co-workers if you were to go up a hill with this older supervisor along when the car automatically downshifted to help it go up the hill, the supervisor would feel that jerk of the shift down and assumed that whoever was driving was spinning the tires at that moment. So I was on eggshells driving him around and had to go up to San Francisco type Hill, but somehow got through it without him noticing anything. Never dreamed in a million years that I would be buying that kind of car for myself, but I really just want the engine and the transmission from Isuzu. I'm hoping eventually the sell the remaining shell to somebody who is a drag racer or a drifter! By the way, one of my co-workers at the time was driving one of the Vega wagons and the starter literally came out and fell down on the pavement!

While the Isuzu Gemini switched from RWD to FWD, the Chevette didn't follow suit.


From '73 to '93 the Chevette was available in Brazil, and at least until '95 it was still assembled from CKD kits in places such as Colombia. The last model-year for a Chevette derivative in Brazil AFAIK was '95 for the Chevy 500 trucklet.

Cd 0.235
 

At breakfast I was looking at the 1981 Opel TECH-1 concept car, designed by Erhard Schnell, based on GM's T-Car platform ( Kadett ).
There's not a great deal of data available for the car but they mentioned:
* front fascia
* panoramic windshield that blended into the A-pillars, killing vortices there
* all-flush glass
* not mentioned is the Aeroback rear roofline with small notchback deck
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I believe that the '81 model Kadett was Cd 0.52, and fell to Cd 0.475 for the 1982 model year.
At Cd 0.235, the TECH-1 would only have 45% of the Kadett's drag ( at equal frontal area ).
It's fineness ratio is close to that of the Cd 0.23 Tesla Model Y, Cd 0.235 Toyota FT-Bh concept of 2012, and Cd 0.235 Renault EOLAB concept of 2014.

For the lurkers: en.wikipedia.org/wiki/Opel_Tech_1

https://upload.wikimedia.org/wikiped...981%29_-_2.jpg

What's up with that rear wheel?

If that's down the street at the museum which the picture suggests, I could go look, but, it appears to be a loose tweeked hubcap. Sometimes the restorers think stuff is significant in the broken condition.

Unlike the Chevette, it's FWD, as it was based on the underpinnings of its direct replacement.

' Chevette HWY mpg potential'
 

From Dr. Gino Sovran's, 'Change in fuel economy from a prescribed percentage change in CdA for a representative automobile...', SAE Paper 830304, Feb.28-Mar. 4, 1983, Fig.-3, pg. 7:
I did an extrapolation of his drag table, and it looks like, if one were to get into the weeds, streamlining the Chevette into 'Hucho-territory' ( Cd 0.133 ), you might experience a 72% drag reduction, and 68-mpg HWY, based on the old 55-MPH National Speed Limit, according to the GM Research Laboratories.
All variables held constant, except CdA.
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With stock gearing?

Better aero wants taller gears.

'gearing'
 

It would require gear-matching, to return the engine to the same' island' on the BSFC map.

Better aero, eventually matched to a lower dead weight. Yet sometimes switching to a different tire size leads to the very same effect...

Just a quick update. The diesel chevette to Pontiac sunbird is a little bit on the back burner right now. Currently in the process of swapping Honda CRX HF manual transmission into a SI engined CRX both same year cars 1987. I wanted to do away with the carburetor base gasket issues and all those numerous vacuum lines, so I'm curious to see what kind of mileage I can get with the HF trans but enjoying the more powerful SI engine? Time will tell.