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Posted (edited)

you mean crommed !

Nicasil is on aluminium cylinders like the cubs !

Croming them would make the cylinders not wear out , no need of boring because they are wore out.

Edited by djackbanshee
Posted

you mean crommed !

Nicasil is on aluminium cylinders like the cubs !

Croming them would make the cylinders not wear out , no need of boring because they are wore out.

 

I am pretty sure that made next to no sense. :ermm:

Posted

US Chrome can nikasil over iron now. Now sure it is worth it since it can flat easier and does have the good heat transfer properties of an aluminum liner. Read about it here US Chrome

 

putting aluminum sleeves in would be very expensive..figure the cost of the sleeves, plating, porting, and install

Posted

chrome wears out just as quick as cast iron. look at airplane engines. due to safety standards, you cant have oversize pistons. imagine an airplane engine getting bores second over and some mechanic accidently installing stock bore pistons and cylinders. could be disaster, so there are no oversizes allowed. there can only be 1 size, so they chrome and bore the cylinders whenever they get worn a little bit and inatall new stock size pistons.

 

but yeah, even in airplanes chrome wears out just like iron does.

Posted

chrome wears out just as quick as cast iron. look at airplane engines. due to safety standards, you cant have oversize pistons. imagine an airplane engine getting bores second over and some mechanic accidently installing stock bore pistons and cylinders. could be disaster, so there are no oversizes allowed. there can only be 1 size, so they chrome and bore the cylinders whenever they get worn a little bit and inatall new stock size pistons.

 

but yeah, even in airplanes chrome wears out just like iron does.

 

That's not exactly right if I can add a few words. I have a '58 Cessna 175 with a Lycoming 180 HP 4 cyl in it. I rebuilt the engine a couple years ago and it uses .010 over steel cylinders and pistons. The rated time to next overhaul is 2000 hours and with regular ol changes the 2000 hour mark is merely a thorough going thru and looking everything over extra well, and many times returning the plane to operation. These things get annual inspections that look at pretty much everything, so keeping on top of them before a problem begins is a pretty regular process. Got all kinda pics if you wanna see them at http://profiles.yahoo.com/corkforbrains The photos are all under the "homepage" link at the bottom of the profile

 

~cork

Posted

nikasil (nickle silicone carbide) is a treating/coating used on aluminum cylinders, you can find it in almost any late model 4cyl car engine. The nikasil is VERY hard, but it dose (like anything else) wear out, and then it is very expensive to re-do.

Some drag race engines use it on cast cyl's but these are very short lived and frequently replaced.

With hone and ring technolagy now days, there is nothing wrong with the cast sleeves. The HP gains on a nikasil cyl in neglagable, especially for the cost.

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