Hey everyone. Got a question. Searched with no luck.
What is the size of the clutches/pressure plates that come stock with Ecotec powertrains, and what is the largest that will fit on the flywheel?
Here's the deal...
I'm putting an Ecotec motor onto a Fiero transmission, which uses the 80's Isuzu and Getrag tranny clutches: I think it's 9 1/8" diameter with a 24"X1" spline... just like the j-bodies of the same day, if I remember right. (I've only done auto j-bodies, so I'm not sure).
With what I've learned so far, an Ecotec flywheel with a Fiero clutch/flexplate is the solution, but does anyone say different?
Thanks you guys! I love this forum. It's so... complete!
What transmission in the Fiero? Sounds like the Isuzu 4spd in there, did it origionally have the 2.8L in it? If so, i know for sure that the ECOTEC has a different pattern on the bellhousing than the 60 degree V6 does. Or the 2.2/2.0 OHV motors.
Hi, and thanks for such a quick response!!!
It's actually the Isuzu 5-speed, and I probably should have mentioned that I have an adapter plate to mate the Fiero's transmission to the Ecotec.
The stock motor is a 2.5L OHV Iron Duke, but it's the same bolt pattern as the 2.8, 3.1, and 3.4L 60deg V-6 motors. The 85-88 Fiero's actually had the 2.8 available from the factory.
See, here's the thing... I have a counterpart who is doing an automatic conversion, so the adapter plate does work, but no one has done a manual conversion yet, so the clutch area is kind of an untouched realm.
Any hints you guys have would be greatly appreciated.
Thanks again!!!
Why wouldn't you mate it to the stronger and more reliable 2000+ Getrag transmission? It could save you a ton of headaches... then you just throw in the stock ecotec clutch ad flywheel...
-Chris-
-Sweetness-
-Turbocharged-
Slowly but surely may some day win this race...
The Isuzu transmission is strong. GM's modifications to the Isuzu transmission makes it weak. The older Isuzu transmission in an Isuzu car that you get, the stronger it is. Since his is fromt he 80's, it's probably well strong enough. The 95+ Isuzu MK7 will handle 200hp and more that 200 ft/lbs just fine.
fieroturbo - As for the size specifications on the clutch, i'm not sure. I'm almost willing to bet that since they used the ECOTEC and the 2200 in the same year of car, using a variant of the same transmissions that the splines are probably the same. May want to email, call tech support, send a letter, or something to a clutch company, and tell them what you're trying to do, and ask them about clutch sizes. Someone will want your business.
SunfighterGT wrote:Why wouldn't you mate it to the stronger and more reliable 2000+ Getrag transmission? It could save you a ton of headaches... then you just throw in the stock ecotec clutch ad flywheel...
-Chris-
I have one of those transmissions, but putting one in would mean custom transmission mounts, custom shift links, custom clutch link, and custom axles... and that's just the beginning.
It's bad enough that I need to make a custom throttle link and a custom upper motor mount.
A transmission I have for long term is a 4-speed muncie with a 4.10 final drive ratio. I got it out of an 84 Fiero a guy was parting out.
Well, I guess I just have to call around. This sounds like it will be expensive.
I do not have the measurements, but we have a Ecotec motor and 5 speed tranny sitting in the garage (clutch and flywheel as well). We could try to take measurements for you. Also in a couple weeks we will have a Spec stage 2or 3 clutch for it, and a Spec flywheel.
FU Tuning
fieroturbo wrote:SunfighterGT wrote:Why wouldn't you mate it to the stronger and more reliable 2000+ Getrag transmission? It could save you a ton of headaches... then you just throw in the stock ecotec clutch ad flywheel...
-Chris-
I have one of those transmissions, but putting one in would mean custom transmission mounts, custom shift links, custom clutch link, and custom axles... and that's just the beginning.
It's bad enough that I need to make a custom throttle link and a custom upper motor mount.
A transmission I have for long term is a 4-speed muncie with a 4.10 final drive ratio. I got it out of an 84 Fiero a guy was parting out.
Well, I guess I just have to call around. This sounds like it will be expensive.
Here is what I'm thinking......
Use the EcoTec trans......
- Axles, their going to be the same (at least between the Izusu and Getrag in 3rd Gen J's they are..... so I'm assuming your Fiero axles will mate into the Getrag)
- No clutch problems, if you use an adapter plate, your going to have to modify your T/O bearing to travel farther to release the clutch
- Hydrolics...... the Fiero has an external slave cylinder, but its still hydrolic...... just make an adapter to go from where the Stock line ends, and the Eco Slave line is on the trans
- make sure you have the stock trans mounts for the new mount, and just modify or weld in new brackets into the Fiero.... not hard
The only thing I dont have an answer for at the moment is the shift cables......... but I'm sure it can be worked around.
All in all, I believe the Eco Getrag is the better way to go.
SPD RCR Z -
'02 Z24 420whp
SLO GOAT -
'04 GTO 305whp
W41 BOI -
'78 Buick Opel Isuzu W41 Swap
Well, here's a thought...
What if I just machine a 5/8" thick aluminum ring to go between the fork and the TO bearing? That would give it the needed distance... right?
Because if I make a spacer to go in between the flywheel and the crank, that would probabbly prevent the starter motor gear from reaching the flywheel.
Anyone have any other say to this matter?
Also, what year range is the 3rd Gen j-body?
THANKS!!!!!!
