What is a "matched" engine anyway?
 

Hi,

Heard a lot about "matched" piston and sleeve, what is this "matching" process anyway? My LHO said "matching" is the difference between a NSR S5 piston and sleeve that cost about 100 bucks, and a Max S5 piston and sleeve that cost about 250....

Could someone enlight me about what this process is, and how its done?

Isnt' it when they match piston and sleeve with the closest tolerances?

Re: What is a "matched" engine anyway?
 

I realy don't know what they mean by matched, but I can assume only two things. First-better matching temperature expantion rate between piston and sleeve and second is better matching fitting in piston-liner joint. In price difference, it looks like it is about temperature matching, not mechanical sizes fitting.

Re: What is a "matched" engine anyway?
 

:D :D
Which LHO d u go to :lol: ?
The first batch of MAX in HK were very good. Most I have seem and used have good piston fitting. I believe they SELECTED the piston so it fit according to the Sleeve size therefore not much running in was required. ( mechanical fitting)

I assume you were looking at the MAX S5 P/S comes in a Polybag header. Phyically, they look quite good as I can see the piston sitting quite far into the sleeve, close to TDC. But for extra $150???? no thanks.

I can lap your piston for Free. :smile:

ALso, Max piston and NSR piston uses different material and production process. Which one is better.... depends who you ask.

Actually the matching is a proccess by which the piston and sleeve are selected for mechanical tolerances and eliminating manufacturing defects even further. This will aid in break in and also retain a higher compresion ratio once that process is completed. The difference should be no higher than $75.00 US for this. Is it alot...yes. But it is worth it.

If you are purhasing this for your Max engine, please contact me at [email protected] and I will direct you to a reputable dealer in your area.

If this is for your Novarossi then just get the standard Piston and Sleeve.

Cheers,

John Rabbito