big bores?

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Jan 19, 2011 | 06:50 PM

#11

Egldr05

Road Warrior

Joined: Jan 2007

Posts: 1,415

Likes: 18

From: Belmont, MI

Quote:

Originally Posted by ElectraHead

thanks, thats pretty much the response i got from SE. just i can get a 98ci?any recomondations where to find these parts?

Call Randy at Hyperformance http://www.kingofcubes.com/about.htm

He did a set of 98" cylinders for me and supplied pistons and rings with gaps all set. I couldn't be happier and will definitely use him in the future.

Rick

Jan 19, 2011 | 06:52 PM

#12

harleycharlie1992

Unofficial HDF Chaplain

Joined: Dec 2009

Posts: 21,155

Likes: 18,076

From: san diego

Quote:

Originally Posted by harleytuner

Might as well bore to a 98", still don't have to split the cases.

can't go that big cyl. walls will be too thin

Jan 19, 2011 | 07:09 PM

#13

Egldr05

Road Warrior

Joined: Jan 2007

Posts: 1,415

Likes: 18

From: Belmont, MI

Quote:

Originally Posted by harleycharlie1992

can't go that big cyl. walls will be too thin

Sorry, but you are wrong. I as well as hundreds, if not thousands of others have been running 98" stock bored cylinders for thousands of miles without any issues whatsoever. As a matter of fact some builders go straight to 98" unless 95" is requested.

Rick

Last edited by Egldr05; Jan 19, 2011 at 07:14 PM.

Jan 19, 2011 | 07:22 PM

#14

yljkt

Banned

Joined: May 2010

Posts: 1,229

Likes: 2

From: Dirty Jersey

S+S has a nice 97 inch kit thats easy to install and the price ain't bad. When you start building a monster motor, your finances dictate the results. Thats the truth.

Jan 19, 2011 | 09:21 PM

#15

harleytuner

Outstanding HDF Member

Joined: Mar 2009

Posts: 3,253

Likes: 222

From: Fredericksburg, Va.

Quote:

Originally Posted by harleycharlie1992

can't go that big cyl. walls will be too thin

Wow, good to know thanks. I'll have to let my buddy know that has over 50,000 miles on is. The 107 that is so popular has the same bore as the 98", same wall thickness as well.

Last edited by harleytuner; Jan 19, 2011 at 09:24 PM.

Jan 20, 2011 | 09:37 AM

#16

harleycharlie1992

Unofficial HDF Chaplain

Joined: Dec 2009

Posts: 21,155

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From: san diego

this surprises me, how big is the bore on 98? 3 15/16? 95 is 3 7/8, as looking at the cyl, I myself would be leary of going much bigger without causing heat issues, I am obviously wrong if people are doing this, already just curious about piston size, I've done a 107 using stock stroke, and boring cases and using bigger cyls, 4 1/8 gives 107" , dont make me do the math please!

Jan 20, 2011 | 09:52 AM

#17

inverse121

Tourer

Joined: Aug 2010

Posts: 320

Likes: 24

From: Hudson Valley

Quote:

Originally Posted by harleycharlie1992

dont make me do the math please!

Next time your kids ask you when they are going to use math later in life, tell them when they need to figure out the displacement of a v twin engine on the fly!

Volume of a cylinder = 4/3*pi*radius sqaured*height

Or in our case

Displacement = Number of cylinders (2) * volume swept of the cylinder
Where radius = bore/2
Height = stroke

Jan 20, 2011 | 10:07 AM

#18

djl

HDF Community Team

Joined: Jun 2006

Posts: 12,774

Likes: 2,606

From: san antonio

Quote:

Originally Posted by harleycharlie1992

3.932" is the bore size for a 98" and yes, plenty of guys with 88" are going right to 98" with stock cylinders. I would not rebuild a 95" for the 3+ displacement increase but if starting from scratch, it's a no brainer and more bang for the buck.

Quote:

Originally Posted by harleytuner

Wow, good to know thanks. I'll have to let my buddy know that has over 50,000 miles on is. The 107 that is so popular has the same bore as the 98", same wall thickness as well.

That is true when speaking in the context of the 96" configuration. However and just to avoid confusion, the 107" that is so popular is what is referred to as an "all bore" 107" which is a 4.125" bore on the shorter 4" stroke of the 88" configuration.

Not trying to start some chit but since the OP was based on an 88" configuration, I thought it appropriate to point that out. It can be confusing.