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| 1988 V6 Crankshaft Scoring (Page 1/2) |
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Payson M
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FEB 14, 06:34 PM
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Recently I tore apart my 1988 Pontiac Fiero V6 engine due to rod knock, turns out it was pretty bad, and there is significant scoring on the crank journal for piston #4. My next thought was to use the crank from my 1987 engine, but I quickly found that they are not the same, as only of them is internally balanced. I have not been able to find a replacement crankshaft for the 1988, I was wondering if anyone had one, or if it is best to replace the rod bearings for a while, until I have enough to use a 3.1L crank and pistons as a replacement, as I did some reading and they are compatible.
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Vintage-Nut
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FEB 14, 07:28 PM
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1985 Fiero GT
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FEB 14, 08:16 PM
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Would you be able to use the 87 crank, unbalanced, with the 87 flywheel/pressure plate (the external balance)?
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82-T/A [At Work]
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FEB 14, 09:49 PM
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| quote | Originally posted by Payson M:
Recently I tore apart my 1988 Pontiac Fiero V6 engine due to rod knock, turns out it was pretty bad, and there is significant scoring on the crank journal for piston #4. My next thought was to use the crank from my 1987 engine, but I quickly found that they are not the same, as only of them is internally balanced. I have not been able to find a replacement crankshaft for the 1988, I was wondering if anyone had one, or if it is best to replace the rod bearings for a while, until I have enough to use a 3.1L crank and pistons as a replacement, as I did some reading and they are compatible. |
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The 3.1 stroker kit is available from ARI Racing for $650: https://engine-parts.com/pr...er-engine-basic-kit/
It comes with the pistons, rods, crank, and bearings.
Hah, that's like 20 minutes from where I live.
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jelly2m8
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FEB 15, 12:05 AM
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Cheaper and easier to take the crankshaft to a machine shop, they will be able to provide what ever sized bearing it will require after their work.
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Raydar
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FEB 15, 05:06 PM
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If I already had the engine out, and disassembled, I'd just do the 3.1 conversion.
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Payson M
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FEB 16, 12:56 AM
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| quote | Originally posted by 1985 Fiero GT:
Would you be able to use the 87 crank, unbalanced, with the 87 flywheel/pressure plate (the external balance)? |
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Thats what I am trying to do at the moment, however I have not been able to come across the 87 flywheel.
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Payson M
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FEB 16, 12:59 AM
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| quote | Originally posted by jelly2m8:
Cheaper and easier to take the crankshaft to a machine shop, they will be able to provide what ever sized bearing it will require after their work. |
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Ill try and do that as my first step, hoping the crank isn't too far gone for them to fix it.
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Payson M
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FEB 16, 01:02 AM
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| quote | Originally posted by 82-T/A [At Work]:
Hah, that's like 20 minutes from where I live. |
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Thats honestly not too bad of a price, I will have to look into that if the machine shop says the crank is toast.
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Dennis LaGrua
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FEB 16, 12:04 PM
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When using the 3.1L crankshaft, you may be able to use the later neutral balance flywheel and just have the whole assembly re-balanced. Might be a good idea to check costs and see what else the budget will buy. Many engine swap mechanics sometimes remove a good engine to upgrade, Three of my personal swap engines replaced 50K and 60K mile 2.8L engines. They were removed and they were sold for a song. Check around here and on Facebook and something may turn up., ------------------
" 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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