Carbon Pistons.....
Discussion
Just seen this on a forum and thought you guys might like to see/comment.
http://forums.evolutionm.net/showthread.php?t=3308...
Cheers
Chris.
http://forums.evolutionm.net/showthread.php?t=3308...
Cheers
Chris.
Interesting more a graphite piston than carbon I'd say either way its a new material, one thing I do wonder is what the running temperature of the piston would end up being? As its got a low thermal conductivity so it'll take a while to heat up (good) but than also means it could get hot and stay hot, which would be poor for vol eff.
Either way I'd give them a go.
Matt
Either way I'd give them a go.
Matt
good point there mat!
wonder what the cost for a set of pistons would be??
if you look at the brake market. its say 2500 for a set of calippers and discs in steel. in carbon its about £10K! lol
have no idea on how much these will cost though.
anyone got any ideas on what the ware rates would be?? due to the massive reduction in thermal exspansion they dont need rings.
Chris.
wonder what the cost for a set of pistons would be??
if you look at the brake market. its say 2500 for a set of calippers and discs in steel. in carbon its about £10K! lol
have no idea on how much these will cost though.
anyone got any ideas on what the ware rates would be?? due to the massive reduction in thermal exspansion they dont need rings.
Chris.
350Matt said:
Interesting more a graphite piston than carbon I'd say either way its a new material, one thing I do wonder is what the running temperature of the piston would end up being? As its got a low thermal conductivity so it'll take a while to heat up (good) but than also means it could get hot and stay hot, which would be poor for vol eff.
Either way I'd give them a go.
Matt
Application of a thermal barrier coating could cure that issue.Either way I'd give them a go.
Matt
Thermal efficiency should be improved also.
Looks like a handy bit of kit, now all i need is finance......
Sounds like a great idea, but graphite is graphite unless it's diamond. Synthetic diamond pistons would be quite good. In my learned opinion, they would be hopeless. That's assuming that it is synthetic graphite, rather than sintered. Still, they would wear like f
kery. They are basically cheese.
C-C is the strongest bond in chemistry hence CF have high tensile strength. Making everything out of carbon is just silly. If you know anything about the structure of graphite, you will immediately see the problem.
The designer obviously knows nothing about the properties of graphite.
kery. They are basically cheese. C-C is the strongest bond in chemistry hence CF have high tensile strength. Making everything out of carbon is just silly. If you know anything about the structure of graphite, you will immediately see the problem.
The designer obviously knows nothing about the properties of graphite.
woooorrb! said:
Sounds like a great idea, but graphite is graphite unless it's diamond. Synthetic diamond pistons would be quite good. In my learned opinion, they would be hopeless. That's assuming that it is synthetic graphite, rather than sintered. Still, they would wear like fkery. They are basically cheese.
C-C is the strongest bond in chemistry hence CF have high tensile strength. Making everything out of carbon is just silly. If you know anything about the structure of graphite, you will immediately see the problem.
The designer obviously knows nothing about the properties of graphite.
i think the material would be a more similar to carbon cermic brake discs than a lump of graphite. dimamond would be hell on the bores. kery. They are basically cheese. C-C is the strongest bond in chemistry hence CF have high tensile strength. Making everything out of carbon is just silly. If you know anything about the structure of graphite, you will immediately see the problem.
The designer obviously knows nothing about the properties of graphite.
Chris.
Mave said:
Am I being dumb? If the expansion is only 1/20 of aluminium, then don't you end up with greater clearances when running? The opposite of cold piston slap? You'd need to build them so tight that once it cooled down, you'd never be able to start it to get it warm??
other way around mate. the pistons exspand in the bores as the engine heats up. Mr2Mike said:
chuntington101 said:
other way around mate. the pistons exspand in the bores as the engine heats up.
Right, but Maves point is that with such a low rate of expansion of the piston the bore may expand faster, giving greater tolerances when hot.Chris.
Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff