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Post by niz76 on Nov 19, 2014 16:58:34 GMT -5
I've been drooling over those high-dollar cylinder kits in the ATV section at Scootertuning.ca. It seems that some have a certain adapter and can only be used with a certain exhaust?
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Post by 2TDave on Nov 19, 2014 18:17:06 GMT -5
I like the high revs and power of my 70. I used a S6 r/t replica crank w/85mm rod, case work, S6 Race Mkii, C16 and a Dellorto 19 with Vforce reeds. It's a runner but still street-able. I haven't got the 103 in tune yet but I expect from some testing it will pull harder down low but won't be as fast on the top as the 70 pulling 12.8k rpms.
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Post by nelson on Nov 19, 2014 18:26:46 GMT -5
I've been drooling over those high-dollar cylinder kits in the ATV section at Scootertuning.ca. It seems that some have a certain adapter and can only be used with a certain exhaust? yes I have also! Just get a polaris case and drop it in. I am not certain what the adapter is for, I think for airflow design. Dunno |
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Post by nelson on Nov 19, 2014 18:29:53 GMT -5
I like the high revs and power of my 70. I used a S6 r/t replica crank w/85mm rod, case work, S6 Race Mkii, C16 and a Dellorto 19 with Vforce reeds. It's a runner but still street-able. I haven't got the 103 in tune yet but I expect from some testing it will pull harder down low but won't be as fast on the top as the 70 pulling 12.8k rpms. it would only make sense that if you had a 103 pulling the same Rpm it would make more power. I assume there is a point that there is a cut off, like the design of the engine that would limit the flow. |
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Post by nelson on Nov 19, 2014 18:34:25 GMT -5
The metrakit pro race is capable of way beyond 15hp...let's say around 20hp @ 14000 rpm. That's a true racing kit! that would be perfect! I hope the pipe comes with the flange and doesn't bolt directly to cylinder. The kit for $796 has pipe with it. Just need intake.I think I would run my doppler crank so I dont have to get new bearings. That is unless it is a long rod or something? |
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Post by nelson on Nov 19, 2014 18:35:51 GMT -5
Dave, what do you consider a runner? What do you think 1/8th mile time would be?
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Post by nelson on Nov 19, 2014 18:37:48 GMT -5
ThAnks for the input guys, tough decisions..I do want to go watercooled i have time to wait for the good stuff while I ride my other scoot
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Post by 190mech on Nov 19, 2014 18:55:52 GMT -5
L/C IS the best way for 2T cylinders..Look into an iggy system that retards as RPM's increase also..
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Post by nelson on Nov 19, 2014 19:02:01 GMT -5
L/C IS the best way for 2T cylinders..Look into an iggy system that retards as RPM's increase also.. will do, thanks for advice. I have built a lot of 2 t motors. Mostly bolt on but some custom work. There is tuning and then there is a. Bell TUNING. I know basics and a bit more but also realize there is a ton of info out there that is mind boggling. Its hard to realize what u dont know when you dont know it  |
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Post by 90GTVert on Nov 19, 2014 19:23:50 GMT -5
I like the high revs and power of my 70. I used a S6 r/t replica crank w/85mm rod, case work, S6 Race Mkii, C16 and a Dellorto 19 with Vforce reeds. It's a runner but still street-able. I haven't got the 103 in tune yet but I expect from some testing it will pull harder down low but won't be as fast on the top as the 70 pulling 12.8k rpms. it would only make sense that if you had a 103 pulling the same Rpm it would make more power. I assume there is a point that there is a cut off, like the design of the engine that would limit the flow. Intake flow (transfers and reeds). Reeds can be dealt with from some solutions 190mech has posted over the years, but transfers are a tougher problem. Look at the size of the transfer tunnels on the 70cc stuff and then look at the 90cc stuff. The big motor is stuck with the same area to work with, but actually can't use as big of a tunnel on either size because of the bore size. John has posted pics of some MX cylinders in the past and the transfers on a ~100cc MX engine are ridiculously large compared to what we have. Here's a pic he posted :  |
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Post by niz76 on Nov 19, 2014 20:46:12 GMT -5
It looks like Stage6 has addressed the transfer issue by producing a kind of adapter that allows the transfers to be bigger!  Still not nearly as large as those MX cylinders though. wow.  |
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Post by niz76 on Nov 19, 2014 20:53:44 GMT -5
I've been drooling over those high-dollar cylinder kits in the ATV section at Scootertuning.ca. It seems that some have a certain adapter and can only be used with a certain exhaust? yes I have also! Just get a polaris case and drop it in. I am not certain what the adapter is for, I think for airflow design. Dunno I'm already running a 90cc ATV engine. It's not a Polaris though, and it's not a shortcase. It's an Adly and it's a mixture of the two and allows for a 12" tire. They can be found in Can Am/Bombardier ATV's. Mine came out of a CanAm... |
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Post by 190mech on Nov 19, 2014 20:57:28 GMT -5
Yeah,The idea is to create an adapter to increase the cyl stud spacing allowing a better transfer tunnel area..We are still stuck with very small entry areas though,but its a great idea!Just another way to "polish a turd"...  |
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Post by 2TDave on Nov 19, 2014 21:36:32 GMT -5
Dave, what do you consider a runner? What do you think 1/8th mile time would be? I don't know. I've got an area I test on and have measured it with an odometer at 1/10th of a mile. I hit about 63mph in that distance. As soon as I get moved I'll get to work on the 103. It has around 10.3:1 gears so those could be made taller for more top end. |
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Post by 2TDave on Nov 19, 2014 21:38:18 GMT -5
I'd like to go to the R/T 70lc in the RX8 at some point. It uses the same adapter.
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