the bores are not coated with nikasil..

the whole bore is fitted with a liner made from nikasil..

think its about 1600 quid to get it done to a 20 block..

could be wrong?

 

Montune quote around £1200+VAT to do it on their site.

 

No it is just the surface that is coated, we do nikasil coatings but only on motorcycle cylinders.

I would say they are alloy sleeves coated with nikasil or may me a steel sleeve coated with nikasil.

 

am sure a read somewhere that it was a niskal liner, and not a coating as you suggest but a have been wrong before

 

could be mate.

 

No nikasil is only 0.25mm think you can not build it up to 10mm thick it is just like paint IE a coating

 

my understanding was that Nikasil is process used to draw a hard nickle surface out from the aluminium bore.

Tricky to do to a cossy block isnt it?

Alex

 

Why would you do this ? What are the benefits ?

 

Low wear, low friction

 

wasn't this the bore coating on the jag V8's from 1996 and used in the porsche 928 back in the 80's and 90's, that never worked for either company, thats why porsche 928's use more oil than petrol, and jaguar gave up with in about 2001 and went to steel liners, if it is the same bore coating, then if Jaguar and porsche can't get it right i would leave well alone!!!!, the idea is good but the practice is not good, for some reason i believe it worked in bike engines though.

 

Oh right, cheers

 

I *think* Porsche still use it for the 911.

 

don't know about the 911 but in the last of the 928's when they went to 5.4 it got that bad that any cars taken is as a part ex at a porsche dealership, got sent back to the factory to have a new engine put in, or at least i believe thats what happend,

 

Steel transmits heat very poorly, where as Aluminium does it superbly. However, aluminium is soft and you can not run pistons in an ally bore - unless you use Nikaseal or Aluseal!


Alex

 

Nikasil is a trademarked electrodeposited oleophilic nickel matrix silicon carbide coating for engine components, mainly piston engine cylinder liners. It was introduced by Mahle 1967, initially developed to allow rotary engine pistons to work directly against the aluminum housing. This coating allowed aluminium cylinders and pistons to work directly against each other with low wear and friction. Unlike other methods, including cast iron cylinder liners, Nikasil allowed very large cylinder bores with tight tolerances and thus allowed existing engine designs to be expanded easily, the aluminium cylinders also gave a much better heat conductivity than cast iron liners which is an important factor for a high output engine.

 

Cool, so my info was vaugly right...

so how is it of help to Cossy owners?

Alex

 

Gotta love a wikipedia quote

http://en.wikipedia.org/wiki/Nikasil

 

i was impressed that he knew that dave