catman12
Expert Class
Posts: 169
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posted June 18, 2004 01:01 PM
Muzzys 1270cc pistons
Hi! Does someone know how much the 1270cc pistons are cut when they are used as 1361cc pistons? (meas.)
Are the 1270cc pistons domed or are they flat?
Thanks // Mikael
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6.23@126.7mph 1/8mi , 9.44@150.99mph 1/4mi 60" Arm, 1361cc, manual shifting.
http://www.kiruna.se/~mgrape
   
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted June 18, 2004 01:53 PM
1270s are raised dome the 1361 are flat for slightly lower c/r
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catman12
Expert Class
Posts: 169
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posted June 18, 2004 08:31 PM
Yes, but does someone know how much they cut the 1270cc pistons?
Thanks // Mikael
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted June 19, 2004 11:56 AM
 Edited By: RAC4IT on 19 Jun 2004 12:58
I do not believe that they are the same pistons. The 1361 is a flat-top and the 1270 is domed. Here is a side-by-side comparison of the Muzzys (JE) 1270 vs. Muzzys (JE) 1361 pistons.
1270 (left) vs. 1361 (right)
Aside from affecting static compression they are otherwise interchangable. Your message implies that Muzzys takes a 1361 piston and shaves it down. I do not believe they do that, because of minor differences in the shape under the skirts I believe they are seperate pieces all together.
Perhaps Doug or Rob will verify.
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RAC4IT
Needs a job
Bergie
Posts: 3009
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posted June 19, 2004 12:50 PM
Ops I forgot to post the link so for future reference click here:
http://www.dontbescaredracing.com/photos/misc/pistons/
I took these photos over the winter. I would be very careful on height, always measure! No matter what pistons you should always measure!
Doug Meyer can answer any of your specific technical questions, email him or post here.
Also Mad Mike has some hands-on knowledge as he runs 1270 pistons in his 1361 for higher compression and more power. This is a great mod if you're running naturally aspirated or very small dry kit only.
I am in the process of updating my website with new technical content and photos, event photos and video.
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catman12
Expert Class
Posts: 169
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posted June 19, 2004 01:05 PM
Thanks Bergie!
// Mikael
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ZXLNT
Needs a job
Kawpuke Extraordinare
Posts: 2853
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posted June 19, 2004 03:20 PM
I was always led to believe that if you had a 1270 kit and upgraded to the 1361/1375 kit they did machine work on your existing pistons.....
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canadamaxxer
Pro
Posts: 1090
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posted June 19, 2004 04:50 PM
The machining of the pistons is true. I have been quoted $75 by a Muzzy's sales rep for that service. I assume they fly cut the dome off the piston.
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