Triton # 2 (T2) 49cc to 110cc & Nearly Everywhere In Between

[lshigham]

Dec 6, 2010 0:03:23 GMT -5 stepthrutuner said:

"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.

I'm not doubting you just sayin'.

LeoVince have them on theit site. I get them from Sip for other pipes, they're under the description.

[90GTVert]

What he said. SIP is a great source for getting at least a general idea of what parts are really intended for.

www.sip-scootershop.com/EN/Products/L5585/Racing+exhaust+LEOVINCE+Hand.aspx

Then if I want dimensions of common parts I go to Parts For Scooters and see if they show it. They're very good about having measurements and dimensions posted.

[stepthrutuner]

Has S.I.P. been doing that for very long? I don't seem to remember seeing that but it's been a while since I've been there???

[90GTVert]

I know for sure they were doing that when I bought that pipe and I've had it for I guess around 2 years now.

[2strokd]

They have been for as long as i know, but they are also updating allot lately too!
Just ordered from them this morning. Hope the shipping charge was accurate this time!

That exhaust fix has got to improve the whole deal drastically 90gt. For sure!

Edit, makes me wanna check all mine like that

[90GTVert]

I marked the cylinder where the exhaust port roof would need to be for 190 degrees. 190 is actually center of the huge mark. I know that's not precise, but I can always check the porting with the degree wheel when it's close.





I started working with the exhaust port, but I didn't go all the way to where I needed it to be. I'm gonna wait till I get my other bits, then I have room to smooth it out without going over the duration I want. I widened the port just slightly. Never measured. Maybe 1-2mm total.





I checked out the skirt by the boost port as well and decided to grind it out a bit.









Pulled the cases apart again and checked this cylinder against what I had matched to the old cylinder (for anyone that wasn't watchin' the Venus build, I tried it on there and ended up determining it's too worn). The boost and transfers will need a little matching.



I brought the boost port toward the cylinder. You should see the difference in the left and right side in this pic.

[190mech]

Its looking good Brent,nicely rounded Ex port,shouldnt have any snags this time!

[190mech]

Did you measure your chord width?Try for about 63% bore diameter.That should wake it up!!

[90GTVert]

Haven't measured anything yet, just kinda did it. lol It looks like it would be somewhat in proportion with the outlet diameter once it's sanded this way. Again, no measuring or math involved there.

[2strokd]

I like what you have done with your skirt, very sexy :rofl: ....
Lol, all BS aside, that will help flow allot and looks very pro. I will be doing this with my next build for sure. Thanks for sharing

[90GTVert]

It's probably a bad choice, but I decided to go a little (maybe a lot) more radical on port timing. I kinda wanna see what a 103cc does over 10,000RPM... aside from grenading. My initial figures/goals were 190 exhaust duration and 133 transfer duration. Wellll... I kicked it up a notch. The finished durations are 196 exhaust and 136 transfer. The exhasut duration should be good for 10,500-11,000RPM. The transfer duration is intended for 12,000-13,000RPM accodriding to Bell's stats, but I have liked the additional transfer duration in the Venus. The longer durations are said to reduce the narrow, "pipey", powerband. I know the Venus will chug along happily at 4,000RPM or pull to about 9,000RPM with it's transfer durations intended for 10,000-11,000RPM according to Bell's book. Hopefully I haven't just made a big mistake, but time will tell.

Here's the exhaust port in it's finished form. Chord width was increased to just a hair over 34mm.





I filed the piston's crown to get the 3 degrees of transfer duration that I needed, and to get the final 2 degrees of exhaust duration without enlarging the port farther. Then I gave teh piston a little smoother finish.



I still have a little bit of work left to finish the case to cylinder match up and I need to finish the header. Then I should be done with port work.

[190mech]

Glad youre making the long duration test,if it works I'll do mine!
Looking nice,no ring snagger there!!

[90GTVert]

I hope not. It's got a healthy chamfer and I tried to keep the port shape mild. I figured the port shape might also help me if the duration is a bit much since it's not going to flow quite as much as a flatter roof would.

[2strokd]

The long trans duration will help. I thought i had mentioned that?
I did this to shaka,s jug and it runs very strong with a worn piston.
Its at around 135-140 trans and 180-190ex, cant remember now?
I did file some off the ex side of the piston to get the timing higher.

All in all, that lil 70 LOVED it, and i was impressed with the results! Wrecked it right into my sons electric scooter and my workbench on a wheelie it ran so good lol. Thats a whole other story tho lol.Hits hard about 8-8,500 and lightswitches to 10,500-11,000 and pulls lika mofo! Im sure your Bigblock will like you for this and will will love what it does for you!

[90GTVert]

You probably have mentioned it, but sometimes the numbers in my head get rattled around and lost. lol