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2.8 engine by achbaby
Started on: 12-02-2007 06:33 PM
Replies: 11
Last post by: Arns85GT on 12-04-2007 06:25 PM
achbaby
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Report this Post12-02-2007 06:33 PM Click Here to See the Profile for achbabyClick Here to Email achbabySend a Private Message to achbabyDirect Link to This Post
Is there any differences from the 2.8 in the 86 to the one in the 87GT. thx Jay
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project34
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Report this Post12-02-2007 07:55 PM Click Here to See the Profile for project34Send a Private Message to project34Direct Link to This Post
Perhaps the biggest "diference" is simply the most misleading one. Because the `87 was rated at a lower RPM than was the `86, there has been a recurring, quite misleading perception that the `87 V-6 produced 5 fewer horsepower than did the `86 V-6.

It didn't. Ratings games aside, horsepower production was the same with both engines.
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pontiacman63383
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Report this Post12-02-2007 08:11 PM Click Here to See the Profile for pontiacman63383Send a Private Message to pontiacman63383Direct Link to This Post
the only difference im sure of is the 87 had fiero ingraved into the intake and the 86 is just a sticker
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Arns85GT
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Report this Post12-02-2007 09:38 PM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTDirect Link to This Post
During 87 they brought in the new engine block. It takes a single piece oil pan gasket. Some engines were actually internally balanced like the 88's. Most were externally balanced.

Arn
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JazzMan
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Report this Post12-03-2007 01:22 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
Actually, the block didn't get changed until the '88 year, though the parts of the block that the oil pan and timing cover fit on stayed the same so all covers and pans are fully interchangeable. The '88 block had some changes made to the casting to allow installation of a crank sensor in the version of the engine that went into cars with DIS ignition, but the hole for the actual sensor wasn't machined out in the Fiero version of the motor.

The cranks are functionally all the same from '85-87 and are externally balanced (requiring a counterweighted flywheel or flexplate), though the '87 crank had lead-in grooves added to the crank main bearing journals as a running change. The '88 crank went to internally balanced and kept the lead-in grooves.

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Arns85GT
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Report this Post12-03-2007 06:04 PM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTDirect Link to This Post
Excuse me, but can you explain this? I have an 87 block sitting on my engine stand and I can assure you my 85 oil pan does not fit. The front end is completely different.

Arn

I spoke to GM and there were a large number of 88 style blocks produced in the latter part of the 87 run that were equipped with externally balanced parts. FYI

Check this http://wiki.60degreev6.com/...%C2%BAV6_Family_Tree

[This message has been edited by Arns85GT (edited 12-03-2007).]

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fierogt28
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Report this Post12-03-2007 06:41 PM Click Here to See the Profile for fierogt28Click Here to Email fierogt28Send a Private Message to fierogt28Direct Link to This Post
 
quote
Originally posted by JazzMan:

Actually, the block didn't get changed until the '88 year, though the parts of the block that the oil pan and timing cover fit on stayed the same so all covers and pans are fully interchangeable. The '88 block had some changes made to the casting to allow installation of a crank sensor in the version of the engine that went into cars with DIS ignition, but the hole for the actual sensor wasn't machined out in the Fiero version of the motor.

The cranks are functionally all the same from '85-87 and are externally balanced (requiring a counterweighted flywheel or flexplate), though the '87 crank had lead-in grooves added to the crank main bearing journals as a running change. The '88 crank went to internally balanced and kept the lead-in grooves.

JazzMan


Jazzman, does this mean the 87 crank was stronger than the 85-86 fiero cranks??

Thanks,

fierogt28
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fierogt28
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Report this Post12-03-2007 06:55 PM Click Here to See the Profile for fierogt28Click Here to Email fierogt28Send a Private Message to fierogt28Direct Link to This Post
Realistically, I find that this topic of my disscusions just doesn't add up for me. It just seems that everyone has a different story about the fiero V6 engines on changes,
improvements, design running changes, info. I'm not saying this in a bad way. I'm very interested on getting this technical info about the V6 crank, block, and different years for the engine that the fiero had.

I know that the 88 flywheel was internally balanced. The 85-86 blocks were the same. 87-88 blocks had a oil pan gasket improvement from a 2 piece gasket (85-86) to the rubber 1 piece for 87-88. I heard that the 88 fiero pistons were lighter. (to confirm, please)

Anyone...please correct me for any errors.

Thanks,

fierogt28
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Arns85GT
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Report this Post12-04-2007 09:11 AM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTDirect Link to This Post
I think the lighter pistons you are referring to are the dished pistons used with the aluminum heads. The piston used with the 88 with iron heads are the same, so far as my research goes. Check the 60degreev6 website above. It has the full history.

Arn
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JazzMan
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Report this Post12-04-2007 02:02 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
 
quote
Originally posted by fierogt28:


Jazzman, does this mean the 87 crank was stronger than the 85-86 fiero cranks??

Thanks,

fierogt28


No, they're the same strength. They were attempting to increase oil delivery to the rod bearings with the grooves to address the premature rod bearing failure problems.

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Report this Post12-04-2007 02:03 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post

JazzMan

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quote
Originally posted by Arns85GT:

Excuse me, but can you explain this? I have an 87 block sitting on my engine stand and I can assure you my 85 oil pan does not fit. The front end is completely different.



The blocks are the same, what changed was the timing cover and oil pan joint. You can swap the timing cover and oil pan as a set across all year blocks, and in fact they fit just nicely on the later 3.4 which was never offered in a Fiero.

JazzMan
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Arns85GT
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Report this Post12-04-2007 06:25 PM Click Here to See the Profile for Arns85GTClick Here to Email Arns85GTSend a Private Message to Arns85GTDirect Link to This Post
Thanks Jazzman.

Arn
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