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Post by oldgeek on Jul 10, 2016 21:10:25 GMT -5
Guess y'all have been busy lately with this flamin' heat wave!A most important aspect to any 2T setup is a piston is FLUSH with the bottom of the transfers at BDC,the inrushing mixture cools the top of the piston...Try to set it up that way and see how the rest of the numbers add up... I took a nap, got some dinner, then went to the warehouse to get some numbers. Using .9 of metal base gaskets I got the piston flush with the transfer floors. Exhaust duration = 188 transfers = 130 I did not get the squish number, but it should be around 1.5   I will get the head and cylinder out to you sometime this week.  Hmmm. Looks like I got room to add some duration using just base gaskets, since you are fixing the head anyway! LoL! I gotta measure the pipe so you can tell us what it is good for. |
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Post by niz76 on Jul 14, 2016 0:32:48 GMT -5
Lovin this build Oldgeek!
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Post by oldgeek on Jul 21, 2016 20:39:43 GMT -5
I decided to order a Stage6 Sport Pro MKII kit to see how it fits up. It comes with a step cut head that I may be able to use with the Airsal cylinder, IF it happens to be the same diameter.
I still have not been able to get the Yasuni R pipe measurements, there is just not enough time/energy left at the end of the day.
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Post by oldgeek on Aug 3, 2016 19:48:32 GMT -5
Bummed. My shipment is nowhere to be found. I ordered it 7/21 from Scooter Attack and tracking shows it left Germany 7/23 from there it is MIA. I have ordered from SA several times and shipping is pricey but I have been amazed at the speed that orders arrive, not so lucky this time.
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Post by birdman on Aug 3, 2016 22:08:31 GMT -5
that sucks man.  |
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Post by oldgeek on Aug 7, 2016 21:11:30 GMT -5
WoW! My package from SA just surfaced in the USA! Should be here Tuesday or Wednesday.
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Post by oldgeek on Aug 8, 2016 20:47:25 GMT -5
Amazingly  Today The S6 Pro MKII step cut head looks much nicer than the one from the Athena kit, but it reaches too far into the Athena cylinder to use without adding a lot of head gaskets.  The three cylinders left to right are S6, Athena, stock. I am concerned that the S6 exhaust port is not beveled very much compared to the Athena and the stock cylinder. The bevel on the cylinder is supposed to match the bevel on the pipe to create the seal, it does not use a gasket to seal.  |
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Post by oldgeek on Oct 17, 2016 20:49:50 GMT -5
I decided to pull the motor on this scoot so I could get at it better. Trying to set up everything while the motor is in the scoot is just too aggravating for me. I snapped a couple pictures of this piggy.   |
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Post by oldgeek on Oct 21, 2016 23:47:31 GMT -5
Its been quite a while since I last worked on this project, and with so much other stuff going on I pretty much forgot where I am with this build.
So tonight I pulled out the 2 cylinder kits I have for this scoot and tried to find a setup of some sort. I have an athena sport kit and the S6 MarkII sport, both of them are aluminium kits and both kits are similar except the S6 kit has a step cut head that extends into the cylinder. Neither kit sets up very well right out of the box. Both of the kits need quite a bit of base gasket to get the transfers flush with the piston top at BDC, then that throws durations and squish out the window. with the S6 kit if I use enough base gasket to flush up the transfers to the piston, the durations end up around 201ex and 138xfers. LOL! The athena is not much better and the squish on it is over 1.5mm if I set up the xfers flush with the piston.
I started swapping pistons, cylinders, and heads between kits to see if anything works out better. The best combo I could come up with was using the S6 piston, the Athena cylinder, and the head from the stock 50cc cylinder. Durations will be around 194-195ex and 132xfers, and squish will be about .85 around the edge of the piston. The combustion chamber will be oddly shaped and compression may be a bit high, but I may give this combo a try anyway.
I guess I could profile the piston a bit at the xfers, but they are single ring pistons and are pretty thin above ring. So....
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Post by niz76 on Oct 22, 2016 0:52:20 GMT -5
I understand that manufacturers need to allow for loose tolerances but never understood why some of these kits are so far out-of-whack. Sounds like you've found a decent combo though!
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Post by oldgeek on Oct 22, 2016 18:25:35 GMT -5
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Post by 190mech on Oct 22, 2016 18:42:06 GMT -5
Be glad to step cut it for ya!The ideal ring pin location is 180 degrees from the center of the Ex port,that way the ring doesnt side load the locating pin when it bugs out into the Ex port..Most of the high end road race 2T motorcycles run the ring ends right thru the middle of the boost port as the boost width isnt enough to cause it to hang up...  PS,the head on the right has the best finning layout and should run waay cooler than the others.. |
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Post by oldgeek on Oct 22, 2016 19:46:07 GMT -5
......Most of the high end road race 2T motorcycles run the ring ends right thru the middle of the boost port as the boost width isnt enough to cause it to hang up... PS,the head on the right has the best finning layout and should run waay cooler than the others.. I gotcha makes sense, so the boost port should not cause a problem with the ring, I will proceed with my plan. I would love to use the S6 head (the one on the right) But it protrudes way too far into the cylinder. I guess I could build a thick head gasket spacer for it or have you cut it down some. I also noticed when using the S6 head the cylinder studs are not long enough to bolt the head up, and the shrouds may not fit especially if I use a spacer with it. Any ideas how to make the S6 cylinder work? If I set the piston flush with the floor of the Xfers the durations are crazy. |
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Post by 190mech on Oct 22, 2016 20:10:21 GMT -5
......Most of the high end road race 2T motorcycles run the ring ends right thru the middle of the boost port as the boost width isnt enough to cause it to hang up... PS,the head on the right has the best finning layout and should run waay cooler than the others.. I gotcha makes sense, so the boost port should not cause a problem with the ring, I will proceed with my plan. I would love to use the S6 head (the one on the right) But it protrudes way too far into the cylinder. I guess I could build a thick head gasket spacer for it or have you cut it down some. I also noticed when using the S6 head the cylinder studs are not long enough to bolt the head up, and the shrouds may not fit especially if I use a spacer with it. Any ideas how to make the S6 cylinder work? If I set the piston flush with the floor of the Xfers the durations are crazy. What is the distance from the deck to the bottom of the transfers??Whats the depth of the step cut on the head?? |
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Post by oldgeek on Oct 23, 2016 11:17:14 GMT -5
I gotcha makes sense, so the boost port should not cause a problem with the ring, I will proceed with my plan. I would love to use the S6 head (the one on the right) But it protrudes way too far into the cylinder. I guess I could build a thick head gasket spacer for it or have you cut it down some. I also noticed when using the S6 head the cylinder studs are not long enough to bolt the head up, and the shrouds may not fit especially if I use a spacer with it. Any ideas how to make the S6 cylinder work? If I set the piston flush with the floor of the Xfers the durations are crazy. What is the distance from the deck to the bottom of the transfers??Whats the depth of the step cut on the head?? 45mm from deck to bottom of xfers. Step on head is 2.65mm |
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