That's because I'm not finished yet, just made the rough shape. I'll be taking measurements with calipers and use a square to make sure opening and closing times are the same on both housings. I'm taking the housings to work tomorrow to clean them up in the solvent tank and finish the porting. I think I'll make the ports more square, seems there's no down side to it.

Other than no chamfer on the intake port yet I think it looks good?

I'll find a real camera and get some good pics when I'm done.

 

Got my engine back together with this square exhaust port (polished it more btw) and sorted the poor porting on the intakes that was done by a UK builder, I used a judge ITO big street port template.

The car is louder with the exhaust port like this, it seems to have a deep tone than before.

 

Who was the **** UK builder out of interest ? Pm if you prefer.

 

Jaydee

 

have you had it on a dyno yet?

 

I find that hard to believe!!!!!!

 

Same, have seen whifbitz rotor housing he ported with my own eyes and it was a work of art.

 

Here's some photos of the porting I've done on my secondary intake ports

 

Sorry they are so big but they show good detail does anyone have any constructive criticism?

 

 

These were done with RacingBeat bridge porting templates. As this was my first time porting you can see the closing edge is slightly rough yet on the resurfaced housing but I do have room to smooth it. These are series 4 t2 housings I'm wondering if i should blend the bowl to the closing edge better. I can feel the material in the water jacket but I'm not entirely certain how much can be taken out. An image to reference would be appreciated.

 

That's pretty damn good for first time.

My only comments would be to use a finer grit stone to fine-edge the standard port outlet and the bridgeport eyebrow as well as shift your paradigm in thinking of porting from being a 2-D thing (where one merely looks at a porting template) to a 3-D thing where the focus should be put on the entire port from the inlet runner to the outlet with respect to how the charge shifts, twists, and turns through it.

The key to porting, in my view, is to try and keep the mass of air entering the inlet going as fast as possible out through the exit with as little of a pressure drop during the turn that can be had. Even though port timing gets modified during porting (and greatly with a bridgeport), the point of all of this in my view is velocity.

B

 

Why all the hate on round exhaust ports. I proudly protest that my engine has round exhaust ports.

Meat heads on the internet seem to frequently discard someone else work which is 'different to the normal' as '****'.

Well, I tell you my mind says: Square exhaust ports may provide maximum flow area for a given port timing, but there is no bloody way in hell that that shape will provide 'the best of everything in any given scenario'. If that was the case ALL wankel rotaries from the beginning would have have square exhaust ports.

I can tell you in my field of study there is always multiple solutions to a given problem, and when something is better at something, it is worse at something else. I question what good is a square exhaust port if as I suspect it provides a 'narrow band of excellence' outside which is it clearly sub-par compared to a round port which provides a broad band of mediocrity outside which it is still clearly above par.

People on this forum who really should know better clearly don't.

 

This, life is a game of sacrifices, you gain something but you have to give up something else to get it.

 

I also ported the runners to the size of the opening where the intake mounts, removing the material that necks the port down, blending it all the way back to the bowl and port opening.

 

Here's the final work on the intake secondaries. I'm still deciding on exhaust while waiting for the final parts for assembly but this is where they're at as of now. Plans have changed slightly over the past year or two, this engine will be run on a IDA for a year while collecting efi and turbo parts. I've decided not to go with a gt4088r for cost reasons and power goal changes. BW s372 is the new plan.