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Post by drc174 on Nov 30, 2016 8:20:59 GMT -5
I found the variator lame and a sporty cvt really spiced it up.
When it comes to variators, I only use Malossi as I had bad experience with the cheaper brands. The Multivar2000 really pushes it forward on launch. The MHR is steep and needs some more engine power, with the 70 perfect. Dont worry about the rest for now.
PM me, I can shoot you some pics of the one I have left later and we can sort something out
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Post by oldgeek on Dec 4, 2016 21:26:39 GMT -5
I am still working on this build here and there, and am undecided as to whether I will be splitting the cases to do a bit of port matching or leave it as is. I also found a flat top piston that fits this build and I have been test fitting it with the 2 cyliders I have. I have no idea the pros and cons of flat top vs. domed pistons, but I am sure someone can tell us about them.  I also took a picture of each cylinder with the C16 flange attached. First picture is the S6 MKII cylinder, second picture is the athena.   |
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Post by tsimi on Dec 4, 2016 22:05:36 GMT -5
Lucass2T knows some stuff about domed or not domed pistons. I am sure he'll chime in.
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Post by drc174 on Dec 4, 2016 22:46:44 GMT -5
When I mounted the MHR Racing exhaust onto my MKII, i didnt even have to touch it with a dremel. (Also i really could not be bothered, hah)
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Post by Lucass2T on Dec 5, 2016 4:01:05 GMT -5
I found that the flat dome piston supplied by athena with my metrakit mk3 was not up for the task. The top got hot and caved in. But the engine nor cylinder overheated or anything, ran real strong. I had a real good tune on the engine and it was running very good. A domed top is way stronger than a flat one.
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Post by oldgeek on Dec 7, 2016 22:12:31 GMT -5
Was wondering if anyone can recommend durations to shoot for using the C16 pipe?
Thinkng of giving the following combo a try. Athena sport cylinder, athena flat top piston, S6 MKII head slightly modified. Durations at 192ex 132xfer squish will be between .8-.9
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Post by drc174 on Dec 8, 2016 0:13:49 GMT -5
I think that is good, go for it. 185-190 I would run a C16, but if needs be it is a screamer
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Post by Lucass2T on Dec 8, 2016 5:42:16 GMT -5
Yeah i totally agree with drc.
But eh you know the mk2 head is domed? And you're gonna use a flat dome piston? Maybe is misread something but thats not gonna work.
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Post by oldgeek on Dec 8, 2016 5:54:40 GMT -5
Yeah i totally agree with drc. But eh you know the mk2 head is domed? And you're gonna use a flat dome piston? Maybe is misread something but thats not gonna work. It reads "S6 MKII head slightly modified"  I will snap some pictures of what I did to the head. Do you know of any good reads or how to's on porting the Piaggio cases? I think I am going to split the cases. |
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Post by Lucass2T on Dec 8, 2016 7:19:07 GMT -5
Yeah i totally agree with drc. But eh you know the mk2 head is domed? And you're gonna use a flat dome piston? Maybe is misread something but thats not gonna work. It reads "S6 MKII head slightly modified" I will snap some pictures of what I did to the head. Do you know of any good reads or how to's on porting the Piaggio cases? I think I am going to split the cases. ooooh you made me curious! Looking forward to those pics! About porting piaggio cases...there are no real 'reads' on porting those...its mostly just looking at various pics and copying a desgin which to you seems to have the best flow and causes the least disprution. I think these look very good:   You could also google for 'piaggio carter tuning'. Thats how everyone calls case porting/trenching over here in Europe.  This is something you want, smooth transistion from the reed area to transfers. you could round off the edges though. And the crankshaft is kinda closed off from the rest of the crankcase to cause the least disruption. This also aids flow, if you have enough meat on the skirts you could attemt somehting like this:  |
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Post by oldgeek on Dec 8, 2016 22:08:09 GMT -5
So the stage 6 head started out like this.  And now about .5mm of the domed lip has been removed. I am using a credit card sized diamond file similar to how you would use sandpaper on a piece of glass to hone the domed lip area flat. I still have a bit more I want to remove.  |
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Post by Lucass2T on Dec 9, 2016 3:39:09 GMT -5
Ah right now I see it! The combustion chamber protrudes into the cylinder for centring purposes but you sanded flat the produding part aka squishband. This also keeps your o-ring groove intact. First I didnt get it though because i didn't know about the protruding combustion chamber  |
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Post by oldgeek on Dec 9, 2016 5:21:29 GMT -5
You got it! As a matter of fact, the S6 head protrudes so far into the athena cylinder, I am using a couple thick aluminium head gaskets I made to space the head out and set the squish. The S6 cylinder has extra length to accommodate the s6 head, but the athena cylinder does not. I guess I should pick up another S6 head while I can still get one. The S6 cylinder will be useless without a S6 head.
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Post by oldgeek on Dec 11, 2016 18:56:35 GMT -5
Picture of the finished head.  Last test fit of cylinder, and pipe before final cleanup and assembly. Looks like I keep the center stand! I just had to remove one of the center stand springs.  Durations should end up around 192ex 130 xfer squish will be around .88mm - .95mm |
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Post by spaz12 on Dec 11, 2016 19:19:54 GMT -5
Looking hella good!
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I will snap some pictures of what I did to the head. 
