First off, I got two junked front irons to practice on, so all these pictures in this post are on a practice iron. I'm using the Racing Beat streetport template to at least start out with, I may make a copy then modify the copy, I would probably only do so for the secondaries.

I'm looking for pointers and discussion, and I have a few questions to get things rolling.

Template over the primary then secondary ports:


Dyed:


Scribed:


Rough cut:

 

Rough cut continued:


Here's a comparison for the size of my grinding bit, which I think is too big for some spots.... I have two carbide cutting bits, the smaller one is the one I used for this work and works pretty well (it is also smaller than this grinding bit).

 

Ok, questions.

-I cut maybe .5mm past the outer edge near the opening edge, it happened when I was blending the stock port into where the template mark ended (template isn't as long as the stock secondary port). Is that a problem? Could I actually extend it out that much the whole way? Would I want to? That is where the side seal/corner seals ride, right?

I know, I should get my e-shaft and a rotor out there to check things out that way. I probably will before too long. I won't be able to do much else today though.

-Should I cut deeper at the closing edge? I only angled the opening to the template line. I've seen some ports go very deep there, and from what I've read I don't want to really do that, BUT I suspect I may benefit from ending the slope (meeting the stock opening) about 5mm lower.

-I also want to know if I should cut the template just to the line or cut the line as well.

I know I can also cut a little into the control ring area, but I would prefer not to do that with this motor. Although I guess if I cut the template out like that then that a little control ring surface would be removed...

 

I guess I need the title updated to show I would like some help. Mods?

 

sorry body i cant help you.....

 

well i came across this in a search to get some pointers on my first streetport. i have the pineapple template and i have everything all marked out and i went at it with a dremel and grinding bit and it seems to be working nicely so far. how did yours turn out?

 

I hope you get shot in the face.

 

.5 mm should not be a problem. If you measure from the ouside edge in and it is less than 10mm, you will then have a problem since that is the path the side seal passes on. If you cut that edge too much, the tip of the side can fall the port and will break eventually.

Anthony