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

 

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

 

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.

 

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.

 

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!

 

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

 

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.

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.

 

thanks for the info, will remember that, don't see too many 88's any more it seems, but thats a good tip!

 

I just go to the Bigboyz web site http://www.bigboyzheadporting.com/TwinCamComp.htm