Well, I had pipe around that should work. It's black steel plumbing pipe that I used for T2's frame brace mounts. Looks like 26.1Xmm ID. Can't get much closer than that. I thought I had some 1/4" steel around, but it seems to have disappeared. I have just enough 1/8", but I dunno if I wanna use it. I'd rather have 3/16". I'd like it to be tough. The stock ZX flange has been bent and it's thicker than 1/8"... although it was tightening over a ring gasket not flat on the cylinder like this will be. I see that I can get 3/16" x 2" flat bar. That would make life easier for making a flange. Planned on going to pick that up, but looks like I won't be able to do that anytime soon.
Last Edit: Dec 2, 2010 12:29:19 GMT -5 by 90GTVert
I didn't feel much like waiting till whenever I got a chance to get somewhere so I started working with what I have. With a little grinding in both of the slots it lined up much more evenly.
I used washers too small, then drilled them to a size where the bolts would just fit through without scraping the threads (15/64) for a very snug fit.
Bolted the flange back up with one washer in place. Stuffed the cylinder with wet rags to keep any slag outta there and tacked the washers in place. Then removed the flange, finsihed welding, and filed it flat.
Repeated for the other side and now there's really no room for movement so I can be sure it stays where I want it after it's port matched. It's not pretty, but it should work.
Last Edit: Aug 14, 2017 13:55:47 GMT -5 by 90GTVert
I was just adding this latest info into my exhaust restriction removal article. Looking at my first pic of the exhaust vs the new one, you can REALLY see why spending the time to do this stuff is necessary.
Last Edit: Aug 14, 2017 13:57:48 GMT -5 by 90GTVert
I took a look at the new cylinder (just like the one on the Venus) on the engine. With 1 base gasket I got 128 degress of transfer duration and 178 degrees exhaust. The piston didn't quite clear at BDC. I went to 2 base gaskets and the piston clears at BDC. Durations moved up to 133 transfer and 179 exhaust. The Venus is usng 130/184 and has a nice wide powerband, but doesn't wanna rev 9,000 or above. I have to assume a good bit of that is the pipe, but I still want more from T2.
I know T2 used to make power at 9000+. It would cruise at 9700-9800 with ease. The ZX says it's for 9500, but I've definitely seen it kicking over 10,000RPM on occasion. I'm gonna shoot for durations good for around 9500-10000RPM and I think that should suit the pipe well. I wish I had measured the duration of the cylinder I raised the exhaust port on with great results, oh well. I'm thinking the transfer durations should be suitable. I think I'd want the exhasut around 188-190 degrees. i hate to kill low end with higher durations, but I was quite pleased with T2 in the past so I would only imagine it will get better.
Last Edit: Dec 5, 2010 21:05:31 GMT -5 by 90GTVert
Post by stepthrutuner on Dec 6, 2010 0:03:23 GMT -5
"The ZX says it's for 9500"
Where did you get this info? I've yet to see an after-market performance pipe manufacturer claim an rpm operating range and have always wondered why not? Of course, I have only bought one pipe new.... just always wondered why they don't publish it in adds.