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  #1 (permalink)  
Old 12-20-2011, 12:38 PM
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Bore and Stroke, stroker flywheels

Hi,

Will and early set of standard harley evo cases accept a 4 5/8th stroke set of flywheels? I'm trying to get my head around putting a larger motor together and was thinking of using a standard set of cases bored for 4 1/8th barrels, but will they take stroker flywheels?

Thanks, Ron.
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  #2 (permalink)  
Old 12-20-2011, 12:50 PM
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you can't get to 4 1/8 without buying big bore cases.
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Old 12-20-2011, 01:20 PM
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standard cases

Quote:
Originally Posted by RedWings View Post
you can't get to 4 1/8 without buying big bore cases.
Thanks RedWings for your answer, forgive my ignorance I am trying to cram all this info into my head. Out of curiosity what is the largest bore you can get on a standard set of cases?

Ok, I looked it up, standard bore is 3 1/2 inches, big bore starts at 3 5/8. So many aftermarket parts!

Last edited by wheeliecake; 12-20-2011 at 01:36 PM..
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Old 12-20-2011, 02:17 PM
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yeah 3 5/8 but you can buy evo cases that will take 4 1/8 if thats what you want.
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Old 12-20-2011, 02:31 PM
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Quote:
Originally Posted by RedWings View Post
yeah 3 5/8 but you can buy evo cases that will take 4 1/8 if thats what you want.
I just want to try and mod an engine, I am trying to learn and do it on a budget... Thanks for the answer.
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Old 12-20-2011, 02:44 PM
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I see, so the next thing would be do you have an early or late Evo, Early has 5 piece flywheels and late has 3 piece flywheels. The early wheels will fit in the late cases but you'll need a S+S pinion shaft to make them work and I don't think they make 3 piece stroker wheels.
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Old 12-20-2011, 02:44 PM
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is it getting complicated yet?
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Old 12-20-2011, 03:04 PM
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Quote:
Originally Posted by RedWings View Post
is it getting complicated yet?
That's why I'm asking the questions now, and yes it's really complicated when you first start taking a look at it! I have always been afraid to take an engine apart, now I just can't resist... To answer your question, early style cases.
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Old 12-21-2011, 06:23 AM
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Quote:
Originally Posted by RedWings View Post
I see, so the next thing would be do you have an early or late Evo, Early has 5 piece flywheels and late has 3 piece flywheels. The early wheels will fit in the late cases but you'll need a S+S pinion shaft to make them work and I don't think they make 3 piece stroker wheels.
YOU are Absolutely Correct
I couldn't have answered it better myself.
And just one added bit of information:
S&S cases manufactured after 2005 to accept the larger stroke wheels and components (4 - 1/8" and 4 - 5/8")`do NOT have the interlock "lip" on the inside

Vince
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Old 12-21-2011, 07:24 PM
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I always wanted to do an 89" Evo. What bore and stroke would that be? I forget as it's been awhile but if I remember it's not much of either
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Old 12-21-2011, 08:26 PM
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It can be done 3 5/8 jugs, 4.56 stroke but after buying all the parts and paying to machine the cases it's cheaper to buy a set of big bore cases. I like the 93" motor, its strong powerful and long lasting or a 96" more powerful but a shorter life.
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Old 12-21-2011, 09:50 PM
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Last time I priced out for piecing one together the sum of the parts came close to the price on an engine, there's just not much on a used 80 inch you'd want to use to put together a brand new performance engine, Cam , heads , carb etc has to support the cubes and the performance level.
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Old 12-21-2011, 10:38 PM
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what would you keep?

Quote:
Originally Posted by Wicked80 View Post
Last time I priced out for piecing one together the sum of the parts came close to the price on an engine, there's just not much on a used 80 inch you'd want to use to put together a brand new performance engine, Cam , heads , carb etc has to support the cubes and the performance level.
Would you keep the standard cases, flywheels etc.?
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Old 12-22-2011, 07:15 AM
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Quote:
Originally Posted by wheeliecake View Post
Would you keep the standard cases, flywheels etc.?
NO....dont do that.
Buy the proper Larger cases(S&S makes em and they arent that expensive-and the COME with TIMKEN Bearings which are a Necessity in a big inch stroker motor) go with New flywheels,Crank & Rods.... you'll have a bulletproof low end that will accept big jugs(love Big Jugs) and then you can purchase your pistons,oil pump ,barrells and heads etc......the higher quality components you build your engine with-the longer it will last & perform.
Buy a little at a time and save up fr the right cases & crank/flywheels to start with.

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Old 12-22-2011, 11:09 AM
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I must disagree. Depends what year EVO cases you have. There are PLENTY of people out there that get good numbers without machining the cases. Heads, carb, cam, 10:1 pistons and ignition and the proper exhaust and you have a reliable and potent EVO. No need to run out and buy new cases. Most of these guy's running around with big inch motors have hardly the HP and Torque they think they have.
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