My question is would a 1988 flywheel fit in a 1987 fiero gt V6 or not? And if it did fit how could this affect the engine??
Recently my 1987 Fiero Gt clutch when out and since I don’t have the tools to perform a clutch job I took it to a shop. I gave them all the necessary parts. Clutch, Pressure plate, pilot bearing, etc. I did not give them a new flywheel because I was told they would resurface my original. This didn’t come to past and a new flywheel was installed without my knowledge. Ones a was told the car was ready, I came to the shop and started is right up but I noticed that the car was shaking violently and I can hear a metal sound coming from the transmission. I’ve heard this sound before when the car would stall out on my.
I believe the shop may have put a flywheel from a 1988 instead of a 1987. PS. The car was running smooth even when my clutch die.
Yeah... An 88 flywheel will likely kill your main bearings - sooner than later. It's waaaay out of balance. Pre-88 flywheels are apparently no longer in production. Lots of parts stores claim that the 88 part works in the earlier engines - or at least they list the same part #. It doesn't work. And if they ordered it from Rockauto, they likely got the wrong one, as well.
You can look at the back of the flywheel, if the lower dust shield is removed from the clutch housing (bell housing). If it doesn't have a counterweight cast into the back, it's the wrong flywheel. Period.
[This message has been edited by Raydar (edited 10-07-2024).]
Yeah... An 88 flywheel will likely kill your main bearings - sooner than later. It's waaaay out of balance. Pre-88 flywheels are apparently no longer in production. Lots of parts stores claim that the 88 part works in the earlier engines - or at least they list the same part #. It doesn't work. And if they ordered it from Rockauto, they likely got the wrong one, as well.
Alright thanks a lot, tomorrow I’ll be asking for a recipe of the flywheel and see what flywheel the put in the fiero. Yeah the engine is running super rough.
The 85-87 2.8L engines were externally balanced. The 88 engines were internally balanced. Therefore an 88 flywheel on the earlier engines will not work as it should.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
The 85-87 2.8L engines were externally balanced. The 88 engines were internally balanced. Therefore an 88 flywheel on the earlier engines will not work as it should.
Thanks Dennis. I’ll keep you guys updated and let’s hope everything turns out alright
I got a good one if they threw away your old one. be thankful that the dukes and v6 flywheels are the same so I have a few
it literally is. bolt and clutch size are the exact same for the replacements you could buy 12 years ago. funnily enough I took the one off the super duty clone engine and it's part number was a v6 part number and my 86 v6 parts engine has a autozone duke one. they bolt up the exact same, fit exactly the same, the only actual difference is the pressure plate itself. not that it matters much when the aftermarket replacements are already much stiffer than stock
[This message has been edited by cartercarbaficionado (edited 10-08-2024).]
Ok so today I got the Fiero back. It drives ok, the shop didn’t bleed the master or slave clutch cylinder so the ride off wasn’t that good. Tho ones home a bleed the system and it’s nice and solid. The engine vibrates. I can feel it inside the cab, but the idle is steady at 1500rpms and it’s a lot more responsive when i press the gas.
Maybe the time is off? Maybe the spark plugs or wiring are bad?? I’ll be checking more later at another time. Currently staying in Florida so I can’t exactly work on the car to much.
You stated that that the engine was running smooth when it went to the shop now you say it's running rough after they changed the flywheel. Draw your own conclusion. As for using a Duke Flywheel on the 85-87 2.8L V6 engine. The external 4 vs 6 balance may not be the same.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
You stated that that the engine was running smooth when it went to the shop now you say it's running rough after they changed the flywheel. Draw your own conclusion. As for using a Duke Flywheel on the 85-87 2.8L V6 engine. The external 4 vs 6 balance may not be the same.
weirdly enough the 2 I had were the same? maybe they are both v6 ones
weirdly enough the 2 I had were the same? maybe they are both v6 ones
They will bolt up but the balance of these engines is dependent on how/where weight was added or deleted from the flywheel. I'd be very surprised if the Duke and 2.8L have identical balancing requirements but anything is possible.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 10-09-2024).]
Ok so today I got the Fiero back. It drives ok, the shop didn’t bleed the master or slave clutch cylinder so the ride off wasn’t that good. Tho ones home a bleed the system and it’s nice and solid. The engine vibrates. I can feel it inside the cab, but the idle is steady at 1500rpms and it’s a lot more responsive when i press the gas.
Maybe the time is off? Maybe the spark plugs or wiring are bad?? I’ll be checking more later at another time. Currently staying in Florida so I can’t exactly work on the car to much.
I think you need to find a new shop to take your car to. Your description of their work deserve a call to the manager of the shop and the demand for an adjustment on the bill.
The other guys nailed it - no neutral balance flywheels in the older style engine. If you are ever doing an engine rebuild, one thing you can do to update the car is source a 3.1 crankshaft which is neutral balance and uses the 88 style flywheel and the slight bump in displacement gives you a noticeable benefit in torque. Need the pistons too as the pin mounting points are different.
No insult intended but I'll tell it to you straight. The job that you have described was done by a half ass mechanic. You won't see good engine life by having the wrong flywheel on your engine. It is really that critical. Contact Mike Valentine or Wayne Renninger, buy a good condition 85-87 V6 flywheel, have it surfaced and installed. If you buy from Wayne and are anywhere near Allentown PA he may be able to install it for you. Jeremy at TFF Auto in Alabama can also do this work but I believe that he's overloaded right now.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
Thanks for all the feedback guys really appreciate. With that being said sorry the the late response just got hit with Hurricane Milton and haven’t had the time. Well the shop definitely did a poor job with everything being said I’m still waiting on the receipt for the job. While waiting I’ve check and ajustes something things. Example adjusting TSP, Loss vacuum lines. Will keep everyone posted
If you determine that you need an externally balanced flywheel, I have a couple that were removed from my old engines when I upgraded to a 3.1 and a 3.4.
