zz1 crate engine internal or external balanced flywheel?
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Car: 1989 formula firebird
Engine: 305 tpi
Transmission: m5
Axle/Gears: 3.45
zz1 crate engine internal or external balanced flywheel?
I tried looking this up with no real luck. Some people say it needs a external balanced flex plate / fly wheel and others say no. One form I read said the zzz owners manual recommends external balance. Any info would be helpful especially from other zzz zz1 zz2 zz3 owners. thanks
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Re: zz1 crate engine internal or external balanced flywheel?
If memory serves, that motor takes the same flex plate or flywheel as any other 1-pc rear main seal motor.
It is INTERNALLY balanced, with the rearmost bit of INTERNAL balance weight located on the flywheel rather than on the crank.
It is INTERNALLY balanced, with the rearmost bit of INTERNAL balance weight located on the flywheel rather than on the crank.
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Re: zz1 crate engine internal or external balanced flywheel?
ZZ3 and ZZ4 are absolutely 86-up L98 / LT1 style flywheel compatible.
I'd assume based on production years the ZZZ is too.
If it's out of the car, look at the flywheel for a weight. 85-down 350 doesn't have one; 86-up does.
If it's in the car, do some decoding:
http://www.nastyz28.com/chevy-engine-code-stampings.php
http://www.nastyz28.com/sbchevy/sblock.php
Ah, this confirms it:
http://www.crateenginedepot.com/pdfs/sb_zzengine.pdf
I'd assume based on production years the ZZZ is too.
If it's out of the car, look at the flywheel for a weight. 85-down 350 doesn't have one; 86-up does.
If it's in the car, do some decoding:
http://www.nastyz28.com/chevy-engine-code-stampings.php
http://www.nastyz28.com/sbchevy/sblock.php
Ah, this confirms it:
http://www.crateenginedepot.com/pdfs/sb_zzengine.pdf
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Re: zz1 crate engine internal or external balanced flywheel?
Yes those motors ARE 100% INTERNALLY balanced.
The rearmost bit of INTERNAL weight is located on the flywheel or flex plate. The fact that it is on an "externally mounted" piece DOES NOT alter the fact that the motor is INTERNALLY balanced.
The terms "internal" and "external" balance DO NOT refer to which side of the split between the crank and the flywheel the weight is on.
The rearmost bit of INTERNAL weight is located on the flywheel or flex plate. The fact that it is on an "externally mounted" piece DOES NOT alter the fact that the motor is INTERNALLY balanced.
The terms "internal" and "external" balance DO NOT refer to which side of the split between the crank and the flywheel the weight is on.
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Car: 1989 formula firebird
Engine: 305 tpi
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Axle/Gears: 3.45
Re: zz1 crate engine internal or external balanced flywheel?
so my flywheel off my 305 will work?
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Car: 1989 formula firebird
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Re: zz1 crate engine internal or external balanced flywheel?
Yea picked it used from a salvage yard in Florida but has some issues going to need a cam since it has some wear on a lope. I am also installing new rod bearings.
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