You sent the cylinder out for porting and plating to some world renowned engine builder..
- porting master.jpg (22.91 KiB) Viewed 3331 times
Then to verify your hard work and dial in your jetting you rent some time on a dyno.
You do a few runs and check out your proud results and.... WHAT?????? 32 HP?????
That can't be right.....
So you play with your jetting for several hours only to see that you can't really improve your results....
Back to the drawing board....
So, you pull the cylinder and check out that port work.
You can see what's been done and think to yourself, if a little is good a lot is even better, so out comes the die grinder and away you go....
Exhaust port looked good so obviously raising it a little wasn't good enough so let's raise it a lot!!!!!
That will fix it up.... OOPS!!! You dinked up the plating so back to the plater it goes.
Finally, after several weeks... Maybe longer.... you get your new cylinder back.
You assemble, break in your new cylinder, and head to the dyno....
The results?
22 HP
What is wrong?
Perhaps your corrected compression ratio isn't what you thought it was
Wait a minute, what is Corrected Compression Ratio
More to come but for now, here is a link to a cool calculator for trapped compression.
http://www.torqsoft.net/compression-ratio.html
Here's another cool link:
http://homes.ottcommunications.com/~red/uccr.html