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2.8l engine compatibility by bowrapennocks
Started on: 06-25-2008 01:39 AM
Replies: 6
Last post by: bowrapennocks on 06-25-2008 03:27 PM
bowrapennocks
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Report this Post06-25-2008 01:39 AM Click Here to See the Profile for bowrapennocksDirect Link to This Post
I have a few questions on 2.8L engines:
1. Are there any differences in the V6 engines used in automatic vs manual? If so, what are the differences. Can the engine from an auto be bolted in as a direct replacement in a car equipped with a v6/manual?
2. I found a new crate 2.8L and am not sure if it will fit an 87 Fiero. The person who owns it does not have any of the original paperwork, and hence does not have the part number. The casting number on the block is 10065459. According a a reference from GM website, that casting number was used in FWD 1990/3.1, FWD 1987-89/2.8. The owner claims it is a 2.8l. Itcame from the factory with injectors and the bottom half of the intake manufold. Any suggestions to determine if it will fit?
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max1
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Report this Post06-25-2008 01:49 AM Click Here to See the Profile for max1Click Here to Email max1Send a Private Message to max1Direct Link to This Post
The only difference is the flywheel, I pulled a 2.8 from an auto car to drop in a manual car and all I did was take the flywheel from the manual motor to put on the motor I was dropping in, You just use the engine wiring harness that is already in the manual car.
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bowrapennocks
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Report this Post06-25-2008 09:14 AM Click Here to See the Profile for bowrapennocksDirect Link to This Post
Thanks!
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JazzMan
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Report this Post06-25-2008 01:37 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
More importantly, starting in '88 GM changed the way the crankshaft is balanced on the 60 motors such as the 2.8. The '88 up motors are internally balanced and use a neutrally balanced flywheel or flexplate, the '87-down motors need a counterweighted flywheel or flexplate. If you use the wrong flywheel/flexplate destroy the motor in no time.

The flywheel is used on manual transmission cars and the flexplate goes with the automatic transmission. Externally the blocks are the same. It is important to find out what cylinder heads originally came on the motor you're looking at buying (aluminum or iron) because the pistons are different between the two and mixing up the aluminum pistons with the iron heads will give you an unusable compression ratio. The block castings were the same, only the pistons were changed for the aluminum head and iron head motors.

Can you post pictures of the engine and intake?

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bowrapennocks
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Report this Post06-25-2008 02:51 PM Click Here to See the Profile for bowrapennocksDirect Link to This Post
Thanks for the information. The engine in question is a one hour drive away, so I am not able to post pictures at this time.
Jim
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Arns85GT
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Report this Post06-25-2008 03:18 PM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTDirect Link to This Post
Starting part way through '87 they started using the new block which has a single piece oil pan gasket (easy to spot) however, some were internally balanced and some externally.

If it is actually a 3.1 it will be internally balanced. You can put your iron heads on a 3.1 and it will work pretty well. They all marry up to the bellhousing, but like the man says, you will have to know which flywheel, assuming the engine does not have one already

Arn
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bowrapennocks
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Report this Post06-25-2008 03:27 PM Click Here to See the Profile for bowrapennocksDirect Link to This Post
Thanks again
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