Re: couple of porting questions =P
- Author: SchijnHeilig (---.adsl.xs4all.nl)
- Verified User: schijnheilig
- Date Posted: 05-12-08 05:51
By “raising” the exhaust port, the author means that you should take a handvile, dremel or whatever grinding tool you feel comfortable with, and increase the height of the port by 3mm. You don’t need to wel any material on the bottom.
Removing any material directly below the window of the piston is a bit vague for me, I’d need to see the piston first. But my guess is that you need to cut a piece out of your piston, to increase the intake timing.
And there aren’t any real step by step guides. Mostly because this isn’t really something you learn from a guide, but rather by trial and error. Try it on some shitty cylinder you don’t mind throwing away if it goes wrong.
Performance gain is hard to tell, as I have no clue how these engines run.
I don’t know if the article you mentioned tells you to widen the exhaustport, but that’s always a good thing to do. You want the absolute width at about 67% of the bore. So you would need to make a portmap to calculate how wide it whould be ;)
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