Port timing

[Robstwin350]

Can someone please define exzactly what is port timing and how to tell if, or by what marjine it is off, and the possibilities of port timing being off, and of couse what cuases it??? thanx guys.

[J.J.]

If your motor is stock then there is little chance of the port timing being off, or ever being off.

 

The port timing refers to the period in degress of crank rotation that the ports(exhaust/transfer/intake) are uncovered by the piston.

 

If you want to learn about this, go to Macdizzy.com, he can explain it better than most of us...

 

 

Click here to go to macdizzy

 

If you're really interested, make sure you read all the chapters of the article.

[Ducman]

Only way to change port timing is to remove material from the cylinder around the port opening; making it larger. When you raise or lower the port by removing the material on the top or bottom of the port making the opening to the cylinder taller you change the timing.