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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 04-30-2009, 03:44 PM   #1
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crankshaft changing?

I had a client ask me something odd today, and I need some answer for him, so here it is...

Is it possible to pull out the crankshaft and insert a new stroker crank while the engine is still in the car...It would reuse the stock rods and pistons..

First of all would it work?

Secondly, would the stock rods and pistons be strong enough?

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Old 04-30-2009, 04:01 PM   #2
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Many times, the rod length will need to be different and the wrist pin location in the piston will change.

Also, even if it would work, you would want to upgrade to forged pieces while you're doing all that work.
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Old 04-30-2009, 04:26 PM   #3
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That is kind of what I told him. I just needed somebody to back me up and to make sure I was not crazy!!

Thanks
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Old 04-30-2009, 04:42 PM   #4
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No.....

With the change in stroke there would have to change either the compression distance on the piston or the rod length.

You can't physically remove LS pistons from the bottom either.

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Old 04-30-2009, 06:40 PM   #5
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NO.
The building of a stroker starts with taking into account:
Deck height-piston compression distance-rod length-1/2the stroke

Then there are wierd things like rod/stroke ratios and base circle changes on cams, rod to block clearance, depending on how radical you get.

Always check the specs first on the entire assembly before even buying parts unless you get a kit but it will be specific for that block.

Also whatch out for the cumbustion chamber size and be sure to recalulate the mechanical compression ratio. It builds up real fast if you are not careful.

I have built a few........
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Old 04-30-2009, 07:14 PM   #6
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Quote:
Originally Posted by PoleCat2SSRS2010 View Post
NO.
The building of a stroker starts with taking into account:
Deck height-piston compression distance-rod length-1/2the stroke

Then there are wierd things like rod/stroke ratios and base circle changes on cams, rod to block clearance, depending on how radical you get.

Always check the specs first on the entire assembly before even buying parts unless you get a kit but it will be specific for that block.

Also whatch out for the cumbustion chamber size and be sure to recalulate the mechanical compression ratio. It builds up real fast if you are not careful.

I have built a few........

It took a woman to answer a mans question..

Keep up the good work...Maybe she can get a group buy going as well!
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Old 04-30-2009, 07:25 PM   #7
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sure you can do this, if you want to punch the pistons through the heads...lol
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Old 04-30-2009, 07:52 PM   #8
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Please stay on topic...
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Old 04-30-2009, 08:43 PM   #9
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Not to mention the crankshaft has to be removed from the bottom of the block. There's a K-member and lots of steering stuff in the way. So no, you can't take the crank out with the engine in the car and no, you can't re-use the rods/pistons, as has already been stated.
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