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want another crank in my motor
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Author:  The Wild Kids [ Sat Jun 07, 2008 7:49 pm ]
Post subject:  want another crank in my motor
Whats the biggest crank I can use in a stock block? I have 94 piston with a stock crank which is a 1914. What is the calculation for the CC size?
I just want to be able to put in the largest motor without having to cut the block.


The Wild Kids
Author:  FOX SHOX [ Sat Jun 07, 2008 8:34 pm ]
Post subject:  Re: want another crank in my motor
Try this engine calculator..http://davisracing.com/engine%20calculator.htm Thanks Dave T
Author:  turboblue [ Mon Jun 09, 2008 3:24 pm ]
Post subject:  Re: want another crank in my motor
The Wild Kids wrote:
Whats the biggest crank I can use in a stock block? I have 94 piston with a stock crank which is a 1914. What is the calculation for the CC size?
I just want to be able to put in the largest motor without having to cut the block.


The Wild Kids


I think you are stuck with the 69.
Even a 74 crankshaft would require a bit of case trimming.
Author:  The Wild Kids [ Mon Jun 09, 2008 10:47 pm ]
Post subject:  Re: want another crank in my motor
Will the 74 fit without having to align bore it and just clearance the sides? Or even a larger crank without having to align bore.

The Wild Kids
Author:  turboblue [ Tue Jun 10, 2008 11:17 am ]
Post subject:  Re: want another crank in my motor
The Wild Kids wrote:
Will the 74 fit without having to align bore it and just clearance the sides? Or even a larger crank without having to align bore.

The Wild Kids


Align boring and crankshaft clearancing are two different operations.
I can almost say any engine case with a fair amount of time on it will need align bored no matter what your plans are.
Align boring is the process of machining the main bearing tunnel through the case to correct any "pounding" that usually occurs in a magnesium case.
This is the surface where the bearing locates after align boring.
Image

Crankshaft clearancing is just that, removing material in the case to swing a larger than stock crankshaft.
Here is an example.
Image

How far you need to go depends on how big the stroke is.
IMHO if you are gonna clearance one for a stroker crank, might asa well be a big one.......... :mrgreen:

One other thing, if you go bigger than about 76, you'll need to clearance the camshaft too.
Image
Author:  Kyle [ Tue Jun 10, 2008 12:46 pm ]
Post subject:  Re: want another crank in my motor
We also had to clearance the crank with my 84. The counterweights would hit the cam lobes.

Kyle
Author:  turboblue [ Tue Jun 10, 2008 1:41 pm ]
Post subject:  Re: want another crank in my motor
Kyle wrote:
We also had to clearance the crank with my 84. The counterweights would hit the cam lobes.

Kyle



What crank do you use Kyle?
Had issues with 86 and 88s but never an 84......... :?
Author:  The Wild Kids [ Sun Jun 15, 2008 12:38 am ]
Post subject:  Re: want another crank in my motor
78 is the largest that I can use without boring it for a stroker. I know that I will have to clearance for the balancers to clear. So what would a 78 crank and 94 pistons give me?

The Wild Kids
Author:  vwtravis [ Sun Jun 15, 2008 1:07 am ]
Post subject:  Re: want another crank in my motor
The Wild Kids wrote:
78 is the largest that I can use without boring it for a stroker. I know that I will have to clearance for the balancers to clear. So what would a 78 crank and 94 pistons give me?

The Wild Kids
78 stroke 94 bore makes 2165cc
Author:  The Wild Kids [ Sun Jun 15, 2008 11:08 am ]
Post subject:  Re: want another crank in my motor
Thanks Travis, How did you come up with that? I have tried and never get it right. I am missing a step in the calculations.

The Wild Kids
Author:  vwtravis [ Sun Jun 15, 2008 3:14 pm ]
Post subject:  Re: want another crank in my motor
The Wild Kids wrote:
Thanks Travis, How did you come up with that? I have tried and never get it right. I am missing a step in the calculations.

The Wild Kids

Try this engine calculator http://davisracing.com/engine%20calculator.htm
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