A couple of months ago I bought the Judge Ito porting templates (aggressive streetport). In the meanwhile I have started the actual porting after doing lots of searching on several forums to get some good answers on my questions:



1. how to finish the edges of the portings? Sharp,soft just cut straight and rub with some fine grid sandpaper for smooth side seal transition?

2. when you have cut out the contours of the new port shape, can you remove material straight donw or angled? This depends on how large or which porting you apply off course.

3. how to adequately determine that you have removed an equal amount of material in matching ports? On cil heads you can do this with water and fill the combustion chamber. Can you do this on a rotary by closing one side of the port and fill with water, matching ports if they have thesame volume? Just a thought.



Here are some pictures of my work so far. Ports have been cut out as for shape.I'm now working downwards. I'll do the channel as wel but only roughly smoothing it out, no mirror finish because of the swirl effect (air/fuel)



Exhaust is to be done. I have both the streetport as the race streetport templates from RacingBeat. Don't know what to use exactly. i need to take emission somewhat into account (Europe).



Idea of my setup for refference:

- streetported 13B-REW engine with upgraded sec injectors(1300 or 1600) or 850's all around.

- non sequential turbos: first on stock 10 psi, later going up to 12-14

- PFC ECU

-HKS downpipe and dual 60mm free flowing exhaustfrom DP to rear muffler





PS: my digi cam is worthless so sorry about the blurry pics.

I'll post better ones tomorrow

 

Your work looks good so far. You still have work to do in the runner. ON the closing edge i like to use 180 grit sand paper and try to make the transition as smooth as possible so the side seal sees less wear. There are many different opinions on the exhaust but I don't like to port down very much if any due to the fact it shortens the power stroke.

 

OK, here are some extra pics with a better camera.



Feel free to use the pictures to add arrows or whatever to indicate where more material could be taken away.



Many thanks in advance,

Neal

 

Here are some pictures so you can see the differences. Itos ports are more square than mine. I have had some good results w/ these. The first pic is a very mild primary. I would not use that primary in the second pic on a street car. It is shown next to a street ported secondary for comparison purposes.

 

Thanks, I'm not planning to take much extra material away from the inner side of the port. JUst ot be safe than sorry. I'm just going to smooth up the surface some more and clean the cuts up.



I hope I didn't go to far on the primaries. The car is a weekend car and a lighter flywheel will make up for some of the low end torque

 

I want another engine to port! I could build and port engines all day long. it's so damn fun!

 

Anybody got some ignition timing tips for this kind of ports? OTher tips with regards to tuning? See other engine specs in my first post