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Old 09-21-2017, 11:10 AM   #1
ole39
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Default crank question

how far can you safely turn an 8ba crank for a lightly modified street cruiser?
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Old 09-21-2017, 11:14 AM   #2
Seth Swoboda
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Default Re: crank question

.030

You are not far from me, it seems. If you need a crank let me know, I have plenty.
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Old 09-21-2017, 12:16 PM   #3
Kahuna
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Default Re: crank question

Bearings were available up to .050" years ago.
Don't think they are around any longer
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Old 09-21-2017, 12:23 PM   #4
Kurt in NJ
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Default Re: crank question

I am amazed at the concern at .030,.040, yet not much concern when 1/8 is taken off to make a stroker----- its more important that the crank grinding wheel has the correct radius--- but it takes time and grinding wheel loss $$ to change radius
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Old 09-21-2017, 01:54 PM   #5
Paul Bennett
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Default Re: crank question

If you seriously want power, check into SCAT srankshafts ... not as expensive as you might think and available to well over 4".
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Old 09-21-2017, 02:24 PM   #6
Seth Swoboda
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Default Re: crank question

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Quote:
Originally Posted by Paul Bennett View Post
If you seriously want power, check into SCAT srankshafts ... not as expensive as you might think and available to well over 4".
I agree with this analysis. You can buy a stroked crank for not much more than finding a good original Mercury crank.
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Old 09-21-2017, 02:27 PM   #7
GOSFAST
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Default Re: crank question

Quote:
Originally Posted by ole39 View Post
how far can you safely turn an 8ba crank for a lightly modified street cruiser?
If brgs are available don't worry too much about the under-size! (I do keep .030" unders, rods and mains, on the shelf for the 8BA's)

Quote:
Originally Posted by Paul Bennett View Post
If you seriously want power, check into SCAT srankshafts ... not as expensive as you might think and available to well over 4".
Under no circumstances would I recommend a Flathead Scat crank, only due to the labor involved making it work. He would also have to change pistons and most likely the rods? Definitely the pistons not sure about rods??

Thanks, Gary in N.Y.

P.S. In our opinion the best rotator kits consist of an Eagle crank, Scat rods, and Ross pistons (moly rings). It's just about all we will handle in "strokers" for the most part! Some exceptions, but few really!
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Old 09-21-2017, 05:21 PM   #8
flatjack9
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Default Re: crank question

It's quite common to offset grind rod journals on Merc cranks down to 1.999 and use full floating bearings.
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Old 09-21-2017, 06:35 PM   #9
KiWinUS
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Default Re: crank question

Quote:
Originally Posted by GOSFAST View Post
If brgs are available don't worry too much about the under-size! (I do keep .030" unders, rods and mains, on the shelf for the 8BA's)



Under no circumstances would I recommend a Flathead Scat crank, only due to the labor involved making it work. He would also have to change pistons and most likely the rods? Definitely the pistons not sure about rods??

Thanks, Gary in N.Y.

P.S. In our opinion the best rotator kits consist of an Eagle crank, Scat rods, and Ross pistons (moly rings). It's just about all we will handle in "strokers" for the most part! Some exceptions, but few really!
Gary has nailed it once again with his great advice.
He has just just helped & supplied a good friend of mine from the pacific NW with a kit & he couldn't be happier with al the help Gary gave him the first class service & how it performs.
He also loves the KiWi-L100 camshaft.
Cheers
Tony
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