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Old 07-21-2004, 12:16 PM   #1
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Default 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?
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Old 07-21-2004, 12:38 PM   #2
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Isnt' it when they match piston and sleeve with the closest tolerances?
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Old 07-21-2004, 01:03 PM   #3
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Default Re: What is a "matched" engine anyway?

Quote:
Originally posted by jasoncsc
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?
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.
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Old 07-21-2004, 10:32 PM   #4
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Default Re: What is a "matched" engine anyway?

Quote:
Originally posted by jasoncsc
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?

Which LHO d u go to ?
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.

ALso, Max piston and NSR piston uses different material and production process. Which one is better.... depends who you ask.
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Old 08-06-2004, 07:25 AM   #5
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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
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