jlb71
Scoot Member
Posts: 65
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Post by jlb71 on Feb 6, 2012 22:42:43 GMT -5
Aluminum or steel witch is better and single ring or double rings?
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Post by reveeen on Feb 7, 2012 0:10:55 GMT -5
Your fastest kits are single ring aluminum kits, your longest life kits are 2 ring iron cylinder kits (and a bit cheaper).
For an everyday driver I *think* you will find a 2 ring iron kit just fine.
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Post by stepthrutuner on Feb 7, 2012 0:27:04 GMT -5
Other points are:
Aluminum cyls. (especially air cooled) are less prone to soft seizing.
Aluminum cyls. can be run harder sooner after a cold start with less risk of snagging a ring or soft seizing.
EDIT:
If an aluminum cyl. does seize the cyl. is more likely to be trashed out than a steel cylinder.
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Post by usmcdoc on Feb 7, 2012 6:33:02 GMT -5
Other points are: Aluminum cyls. (especially air cooled) are less prone to soft seizing. Aluminum cyls. can be run harder sooner after a cold start with less risk of snagging a ring or soft seizing. EDIT: If an aluminum cyl. does seize the cyl. is more likely to be trashed out than a steel cylinder. Very true...installed 3 air sal aluminum kits for peeps...first soft seize...they were done....scored badly! Ebay cheapie steal kit 2 ring piston....the guy soft seized 3 times not premixing properly...and it looked fine...and runs like a champ now... |
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Post by 90GTVert on Feb 7, 2012 12:51:47 GMT -5
While the aluminum cylinders aren't as likely to seize, they are more likely to put a hole in the piston if they run lean. Soft seizing an iron bore isn't necessarily a bad thing, in the respect that it's a warning you don't get with aluminum. Obviously it's best not to seize one period, but a soft-seize doesn't always result in much damage at all. Not like melting a piston. When I melted my Airsal's piston the aluminum from the piston managed to get onto the cylinder walls enough to screw up the bore. One lean spot going down a hill at low throttle and the whole cylinder and piston was done. Iron is easier to work with should damage occur. Aluminum cylinders are coated/plated and if that gets ruined they would have to be re-coated. That can cost more than the cylinder did new. An iron cylinder can often be honed.
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vvtr
Scoot Enthusiast
Posts: 243
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Post by vvtr on Feb 7, 2012 14:28:30 GMT -5
plus an iron cylinder can be rebored and oversize pistons fitted.
not so much an issue with a stock 50cc cylinder as they are dirt cheap new, but if you have invested in a bbk and took time to port it etc, it's a pain starting again and having to buy another.
with a lot of ally cylinders they dont have a liner but instead run a sacrificial piston, meaning the piston is designed to wear at a faster rate than the cylinder plating.
not a problem if you are handy with the tools and dont mind a top end rebuild now & then, but some iron pots are good for 10 - 20,ooo miles if luck is on your side!
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jlb71
Scoot Member
Posts: 65
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Post by jlb71 on Feb 7, 2012 18:58:42 GMT -5
Thanks for all the great info as usual helps make my decision simple (iron)
Another question how is autotechs kit performance wise?
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Post by 90GTVert on Feb 8, 2012 12:34:27 GMT -5
It's a sport level kit. Comparable to Polini or Malossi sport kits. Expect a nice increase in power throughout, but not a dramatic increase in high RPM performance.
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Post by jmkjr72 on Feb 8, 2012 20:08:33 GMT -5
i personaly am a big fan of the top performance trophy kit
its a great alla round kit and its one that with the right pipe will rev to the moon
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jlb71
Scoot Member
Posts: 65
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Post by jlb71 on Feb 8, 2012 21:18:02 GMT -5
Who sells the top trophy kit and is it costly?
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Post by jmkjr72 on Feb 8, 2012 21:50:47 GMT -5
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jlb71
Scoot Member
Posts: 65
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Post by jlb71 on Feb 8, 2012 21:59:54 GMT -5
What do you guys think of the cast iron street race kitfrom stage6?I found it for 148 does that sound like a good price?Thanks
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Post by jmkjr72 on Feb 8, 2012 22:11:01 GMT -5
the street race is a good kit
i like a lot of the stage 6 stuff
the advantage that the top performance brand has is they are the high performance division of motri minerllie the people who desinged the engine
stage 6 is a lot of rebranded stuff
take there al bores they are rebranded athena bores
im not positive but i thought the cast iron street race might be a malossi bore rebranded
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jlb71
Scoot Member
Posts: 65
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Post by jlb71 on Feb 8, 2012 22:16:13 GMT -5
I checked out that link you left that kit was 10mm I have 12mm
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Post by jmkjr72 on Feb 8, 2012 22:22:32 GMT -5
just have to message him they make the kit in 10 and 12 mm
but being he lists it for the yamaha zuma he lists the 10mm
or you can get a 12mm to 10mm wrist pin bearing
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