I am new to here and I am try learning about unique Fiero car... I don't have one not yet... (still looking)

I recent got rare animal a complete 4.3L V6 Diesel engine come out 1984 Oldsmobile Cutlass Supreme (LT6)
No, its not same the 4.3L gas vortec block engine. Some people might it said somewhat similar to
5.7L V8 Oldsmobile engine but its very different one and it had 6 bolts per cylinder so head gasket not a problem.

Its about 85 HP and 165 lb-ft at stock. Not too bad for small car. Adding the little turbo might help and bit fun to drive
but depends what Fiero rear size space under the rear lid.

I was wondering if anyone here have success swap the 4.3 V6 Olds Diesel in the 1980's Fiero?
The MPG supposed be amazing better than the Toy Prius isn't? 60's or plus MPG? Maybe...I have to test it out!

I am curious what best year for Fiero car that come with "V6" engine mount chassis and maybe auto with overdrive or 5 speed?
Id rather to try find 1980's Fiero auto with OD because I don't have solid flywheel for 4.3L V6 diesel, finding the match balanced flywheel
for manual probably the impossible part. Only few year made 1980's Chevrolet Celebrity with opt 4.3L diesel might came
with factory 5 speed manual. Today 2022 its almost extinct as seem.

I'll post my picture 4.3L V6 Olds diesel engine here soon.

[This message has been edited by Z Fiero (edited 09-28-2022).]

Here some pictures! The 4.3L V6 diesel engine come out from 1984 Oldsmobile Cutlass Supreme

Wow that would be interesting! Is it the same bellhousing pattern and the GM 4.3 gas? What about the flywheel torque converter bolt pattern?

quote Originally posted by RichLo1: Wow that would be interesting! Is it the same bellhousing pattern and the GM 4.3 gas? What about the flywheel torque converter bolt pattern?

No, It's not the GM/Chevy bellhousing. It's B.O.P. bellhousing. Here picture you can see the rear end of 4.3L V6 diesel engine. There two pattern different size for bolt on the torque converter.

You'll need an adapter plate for any transverse transmission. There was a transverse version, as you said, in the Celebrities and Pontiac 6000s. That version would be better to swap into a Fiero.
It's still going to be slow. I don't know if the 4.3 is similar, but the 5.7 diesel was better off as scrap than trying to move a car.

It has been done. Search for diesel fiero.

At what was likely the last Fiero Factory swap meet I parked my 4.3cpi fiero next to the diesel 4.3 fiero.

quote Originally posted by Will: You'll need an adapter plate for any transverse transmission. There was a transverse version, as you said, in the Celebrities and Pontiac 6000s. That version would be better to swap into a Fiero. It's still going to be slow. I don't know if the 4.3 is similar, but the 5.7 diesel was better off as scrap than trying to move a car.

I have other car 1982 Cadillac Eldorado Biarritz diesel FWD 5.7L v8 and probably has GM TH325 transmission I am not 100% sure if it had real OD. It just display P R N D 3 2 1. So its 4 speed auto. I don't know if Fiero factory auto does come with OD? but I just reading it few random posts now and most here people said Fiero auto was very weak? it as seem 5 speed manual was better.

Slow? maybe not too bad really, I did drove it the Cadillac Eldorado Biarritz it with factory 5.7L v8 diesel was reasonable with power even its heavy fat pig approx 4,000 lbs body car. For Fiero body it shouldn't be too hard for 4.3L V6 diesel to get rolling? 8 PSI turbo charger probably make bit faster for 4.3L V6 diesel? Yea, I am not looking for racing but good commute car that save my budget for fuel.

https://www.fiero.nl/forum/...050119-2-034219.html
https://a350diesel.tripod.com/dieselfiero.html

quote Originally posted by fieroguru: https://www.fiero.nl/forum/...050119-2-034219.html https://a350diesel.tripod.com/dieselfiero.html

Thank you! that link was very useful info!

They said got 38+ MPG average at hwy seem disappointing result but I realized he probably did install non-overdrive 3 speed TH125C with 4.3L V6 diesel.
I was thinking the early 440-T4 / 4T60 transmission might gain better mpg with 4.3L V6 diesel, as long it does have overdrive it always get better MPG with any diesel engine.
The 4.3L V6 diesel (Longitudinal) with TH325 4 speed probably odd idea to put in with Fiero.

[This message has been edited by Z Fiero (edited 09-28-2022).]

The longitudinal automatic (TH325L) is much more difficult to install in a Fiero than a transverse automatic (440T4). However, to use the transverse transmission, you'll need either an engine with the transverse bellhousing pattern or an adapter plate.

Seems like a lot of work and expense for very little (if any) gain.

quote Originally posted by olejoedad: Seems like a lot of work and expense for very little (if any) gain.

Agreed

Your labour/time has value. Swap parts have value. Thousands of dollars combined for parts and labour for really no gain..other than the "oddball" factor

I'd woulda loved to have that Cutlass with the diesel still in it. Huge G-body fan and I love the chug-a-lug-a sound of those slugs! Best of luck with the swap. Keep us posted please.

Here updates:

I have decided to try swap 4.3L diesel with 1st gen Astro/Safari AWD van since Its hard to find any less than $500 for nice Fiero car at my area. I did brought 1994 GMC Safari XL with nice optional digital cluster, AC/Heater rear and whole van was just $500. Not rusty and about 160k miles on it.