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  Is a 3.4 DOHC hard to drop in a 86, 4 speed manual notchie?Besides engine, what else?

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Is a 3.4 DOHC hard to drop in a 86, 4 speed manual notchie?Besides engine, what else? by branger
Started on: 11-17-2019 02:43 AM
Replies: 11 (313 views)
Last post by: Will on 12-02-2019 08:43 AM
branger
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Report this Post11-17-2019 02:43 AM Click Here to See the Profile for brangerClick Here to Email brangerSend a Private Message to brangerEdit/Delete MessageReply w/QuoteDirect Link to This Post
Been looking at engine swaps for fun, seems like everyone drops in a 3800, but the sound of a 3.4 DOHC IS SWEET! Just wondering what work and other things have to be done besides engine swap for a 3.4 on a 4 speed stock 86 2M6 notchie?
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Will
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Report this Post11-17-2019 09:06 AM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post
In terms of mounting, the 3.4 TDC/DOHC will almost bolt directly in place of the 2.8... The rest is plumbing and wiring.
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ltlfrari
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Report this Post11-17-2019 09:23 AM Click Here to See the Profile for ltlfrariClick Here to visit ltlfrari's HomePageClick Here to Email ltlfrariSend a Private Message to ltlfrariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Custom front engine mount
Dog bone and mount
Exhaust
Coolant plumbing
Power steering delete
Wiring harness
88 (or balanced) flywheel
New fuel pump
ECM, flash of ECM chip to new program
Throttle cable
AC hookup to compressor/hoses

Probably replace the clutch and TO bearing as well while it's all apart.

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Anything I might say is probably worth what you paid for it, so treat it accordingly!

Dave

www.ltlfrari.com

[This message has been edited by ltlfrari (edited 11-17-2019).]

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branger
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Report this Post11-17-2019 10:33 PM Click Here to See the Profile for brangerClick Here to Email brangerSend a Private Message to brangerEdit/Delete MessageReply w/QuoteDirect Link to This Post
Cool, thanks for the feedback.
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ltlfrari
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Report this Post11-19-2019 10:47 AM Click Here to See the Profile for ltlfrariClick Here to visit ltlfrari's HomePageClick Here to Email ltlfrariSend a Private Message to ltlfrariEdit/Delete MessageReply w/QuoteDirect Link to This Post
Info on my swap on my web site (Will be down for a couple of weeks but will be back mid December).

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Anything I might say is probably worth what you paid for it, so treat it accordingly!

Dave

www.ltlfrari.com

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branger
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Report this Post11-23-2019 11:10 AM Click Here to See the Profile for brangerClick Here to Email brangerSend a Private Message to brangerEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks ltlfrari. I will check out your site in December
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Dennis LaGrua
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Report this Post11-23-2019 05:19 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
I believe that the 3.4LTDC flywheel and Fiero clutch will work as is, but you may need a HD clutch.

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" 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 "

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Will
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Report this Post11-25-2019 09:41 AM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:

I believe that the 3.4LTDC flywheel and Fiero clutch will work as is, but you may need a HD clutch.



The 3.4 flywheel may work, but it's a little heavier than the Fierpo 2.8 flywheel, so use the Fiero 2.8 flywheel.
However, the clutch that went with the 3.4 is for the Getrag 284 transmission and has a *PULL*-to-release pressure plate. It will not work with the Fiero Getrag 282.

[This message has been edited by Will (edited 11-25-2019).]

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Dennis LaGrua
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Report this Post11-28-2019 12:49 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Will:


The 3.4 flywheel may work, but it's a little heavier than the Fierpo 2.8 flywheel, so use the Fiero 2.8 flywheel.
However, the clutch that went with the 3.4 is for the Getrag 284 transmission and has a *PULL*-to-release pressure plate. It will not work with the Fiero Getrag 282.



That might be the best choice but I believe that the 88 Fiero neutrally balanced flywheels may no longer be available.

------------------
" 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 "

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pmbrunelle
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Report this Post11-28-2019 07:11 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
The 88 V6 flywheels are still readily available:
https://www.rockauto.com/en...manual,flywheel,5348

It's the early externally balanced flywheels that are unobtainium.
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Rick6375
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Report this Post12-01-2019 01:29 PM Click Here to See the Profile for Rick6375Send a Private Message to Rick6375Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by ltlfrari:

Custom front engine mount
Dog bone and mount
Exhaust
Coolant plumbing
Power steering delete
Wiring harness
88 (or balanced) flywheel
New fuel pump
ECM, flash of ECM chip to new program
Throttle cable
AC hookup to compressor/hoses

Probably replace the clutch and TO bearing as well while it's all apart.


Would the ECM from the donor car not work as is? Am new to all this computer swapping/programming way of tuning. I am considering this swap for my 84 2.5/auto, with the 3.4 and an OD auto in the future.
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Will
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Report this Post12-02-2019 08:43 AM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:

That might be the best choice but I believe that the 88 Fiero neutrally balanced flywheels may no longer be available.



 
quote
Originally posted by pmbrunelle:

The 88 V6 flywheels are still readily available:
https://www.rockauto.com/en...manual,flywheel,5348

It's the early externally balanced flywheels that are unobtainium.


Exactly, GM built MANY MANY more cars much more recently with the neutral flywheel than with the off-kilter flywheel.
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