perlite cast versus perlite-aluminum cast cylinder

on the metrakit website, their 65cc kits are listed as either "cast : perlite" or "cast: aluminum-perlite." does anyone know what the difference is? obviously the cylinders can't be made of perlite . . . perlite expands violently around 800 degrees; that would be a terrible idea. and i thought metrakits were cast iron, anyway . . .

Re: perlite cast versus perlite-aluminum cast cyli

ok let me put this more plainly . . . which is better, this kit

http://www.metrakit.es/english/technical_card.php?codigo=804S0220

or this kit

http://www.metrakit.es/english/technical_card.php?codigo=804P0420

one has a shorter stroke, fewer ccs, but better compression, and is cast in perlite (whatever that means).

the other has a longer stroke, more ccs, but worse compression, and is cast in aluminum-perlite (whatever that means).

does anyone actually know the difference?

perlite cast versus perlite-aluminum cast cylinder

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Re: perlite cast versus perlite-aluminum cast cyli

I have no freaking clue.

Just get em and compare em if you want to know ;)

Re: perlite cast versus perlite-aluminum cast cyli

i believe what they are refering to is, the first kit (dont buy it its actually a catalog error, i ordered 5 by part number and am stuck with 5 unuseable kits that fit nothing in the USA) is a solid cast perlite kit

the second, (kit for the x20/x30) which is european for maxi style engine, is a perlite casting of the ports, with an aluminum overpour making up the fins, much the same as a puch high torque cylinder

Re: perlite cast versus perlite-aluminum cast cyli

the first kit, fits a "suzuki maxi" its a neat little bike, japan market only from what ive gathered, ive looked at adapting them to peugeot, morini franco reedvalve, etc but its just pretty much lame, only good thing that came about these kits were i had 5 sets of rings, and 5 extra wristpins

Re: perlite cast versus perlite-aluminum cast cyli

awesome, thanks! so the second one is the one that'll bolt-on, i take it?

Re: perlite cast versus perlite-aluminum cast cyli

the first one, does not fit a puch at all, its a catalog error by metrakit

Re: perlite cast versus perlite-aluminum cast cyli

hey you learn something new everday. never heard of a suszuki maxi, talk about a moped scooter crossbreed.

Re: perlite cast versus perlite-aluminum cast cyli

that thing is actually pretty cool looking

Re: perlite cast versus perlite-aluminum cast cyli

thats what i thought when i got 5 of those kits, damn, wish i had the bike, the kits a 65cc , similar to peugeot, not similar enuff to used, for case reed, as there is no intake port

Re: perlite cast versus perlite-aluminum cast cyli

The use of the word "pearlite" essentially means that the cast iron has been cooled slowly. This gives the metal a more relaxed structure and makes it less prone to distortions with subsequent heating. They could have quenched the iron (or skipped an annealing step) for faster throughput, but decided to go with quality over quantity.

The pearlite/aluminum cylinder uses a cast iron sleeve instead of plating the aluminum cylinder wall with Nikasil or chromium. The sleeve is typically 3mm thick and makes for a much more durable cylinder than some of the plated materials. It is often cheaper to produce too. It does have drawbacks with manufacturing yield though.

The pearlite/aluminum cylinder gives you all of the benefits of a cast iron cylinder (re-honeing) and the weight savings of aluminum.

As a side note: Avoid Nikasil coated cylinders in the US. The sulfur content in the gasoline here is too high and will erode the cylinder lining fairly quickly. Also avoid using sulfurous 2-stroke oil with Nikasil coatings.

-Eric

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