I have seen lots of articles about big bore kits for the twin cam bikes. Very few stroker articles. Why do not more people do a stroker kit as it yields more bang for the buck than a large bore does.

 

It's cheaper, easier, and faster to do a big bore kit...next question please...

 

You are only supposed to stroke when you can't bore any more.. Bore is cheaper to create displacement and it makes more HP and TQ. Also the less distance the pistons has to move the less vibration. You can't completely balance a 45 deg V twin.. Only reduce it to a certain point.

 

The longer stroke also produces more heat due to the pistons moving faster.

 

Traveling a greater distance, the increase in stroke x 2.

 

Yes but the RPM of the crank doesn't change, therefore the longer the stroke the faster the piston at the same revolution...

 

In the end we're saying the same thing but piston speed increases BECAUSE the stroke of the piston travels further at the top and bottom.

 

Goose, When TC launched, it was an 88"motor that you could bore to 95" with factory parts. If you installed a factory stroker crank, you could go to 103". When the 96" launched, it actually was the stroker crank with the 88" bore.

So, we're already more or less starting with what would be considered a stroker crank if the bike was a 96" from the factory.

Obviously there are now longer stroke wheels available that make much larget displacements with larger bores.

Also the cost in parts and labor to disassemble and install a flywheel vs. boring the cylinders is significantly different.

 

Very simple! Older designs such as shovels and Evos had very little scope for larger bores, as the crankcases weren't very robust, so the only way to get a significant increase in capacity was by stroking. Some aftermarket cases were made that could accept a larger bore, but longer stroke was the way of the era.

From the outset the twincams have all had much more robust crankcases than the Evos and shovels, with greater cylinder stud spacing, enabling them to be bored out to get a significant increase in capacity.

If you would like a big boost in performance there are always aftermarket engines, from SE, JIMS and S&S, up to 135", all with both larger bore and stroke, so there is no shortage of opportunity!

 

S&S had a 145", now has a 143" motor! R&R in Manchester , NH, 1 hour south of Laconia, has a monster 155" motor, Sweet !