V-Twin Forum banner

Compression Ratio: Air Cooled Evo vs. Twin-Cam 103

8.2K views 11 replies 6 participants last post by  Synoptic 12  
Do yourself a favor. Find a good indy shop in your area. Talk to him. I would highly recommend staying away from the HD stage kits. You can do way better then that for less $$$. If all you are interested in is sound that is a easy fix. The stock compression would be find. Like WILLIS3251 I run 210ccp on my bike. You might not need or want that much compression. Know you riding style. Go from there. Good luck!!

Welcome to the forum.
 
You started out by saying you are interested in a 1200 custom. Then you are asking questions about a 103" twin cam. There both good bikes. No matter what bike you get if you are going to change things around you might want to check out these two sites.

Andrews makes good cams. There are many cam makers around. Lots to pick from. This is just a good place to start from. Find the motor size you are interested in and check out the cams. It will tell you the rpm range it is made for and the compression it need to run at.
http://www.andrewsproducts.com/motorcycle-parts/2014-catalog

Then go to BigBoyz site and check out the calculator. You can get a good idea of how things will turn out. You can change pistons, cams, stroke on the crank. Play and have fun. Remember,,, just because you can do it on a computer does not mean it will work on a bike!!! Be carful what you wish for. lol
http://www.bigboyzheadporting.com/TwinCamComp.htm

Pipes are important. Many people like 2/2. I run 2/1. There are many pipe makers. Use the "SEARCH" key at the top of the page. Get a 12pk of beer and have fun. You will find more info then you will know what to do with.

Good Luck!!!
 
Joe I think he is just new to all of this. He did not come across like some. I don't think he wrenches. I'm sure he is doing the best he can. It's ok to be new. :)