Nah, didn't miss that part of your earlier post. I just figure the pistons that are made for this application will work for this application, and that novice engine builders are more likely to run into problems with piston to valve contact due to improper parts selection or mistakes during assembly.

I surely won't be designing my own pistons.


ETA: And you were correct. I missed the ABDC part of your earlier post. I was thinking about TDC.

 

Not trying to steal CJ post but I still need the book for geometry. Been letting the CAD/Cam do it to long for me.

DJL, Does ADDC mean (After Bottom Dead Center)? If I tried to freshen up my 88TCb with new take off cylinder, pins and pistons from a 96 would it just bolt on?
Or are you saying I need new 88 pistons and pins plus the ebay cylinders. I realize it would still be an 88. If you can just enlarge the 88 clylinders for 107 (guess 99 with an 88) why did Harley go the stroke route, 99 sound better then 96? Thanks

 

You did hijack CJs post but it had run its course anyway.

ABDC (not ADDC) mean After Bottom Dead Center. The 96" pistons will not work in an 88" configuration; wrong crank and con rod. Any TC cylinder be it from a TC88 or 96 will work but why not just bore yours to fit some .010" OS SE cast flat top pistons?

The 88" cylinders cannot be bored to 107" but can be bored to 97"/98". I don' know why Harley went the stroker route but there are probably a couple of reasons. Increasing stroke results in an increase in torque, so, the stroker route may have been an attempt to improve the effectiveness of the six speed transmision. Additionally, the sales of big bore kits has been rejuvenated not that a big bore kit will boost displacement to 103" and 107" is within reach with an over bore. And it could be a cheap way for the MoCo to increase sales; the 88" platform was being upgraded to 95" before many bikes ever left the dealership. However, I really don't know why the MoCo went the stoker route.