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01-31-2023, 05:35 PM #16I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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01-31-2023, 06:09 PM #17Screaming And Flying!
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High rings are one thing, the drilling of holes to access the back side of the ring is another. The drilling I believe was outlawed by some racing rules. Chrysler did high rings too , ring was the top in the real stackers. They also did consumer high ring in the big motors and triples and 65 twin. All were 165psi, stackers 195psi.
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02-01-2023, 09:30 PM #185000 RPM
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yes but in a crossflow 2 stroke you have a huge amount of heat buildup and need extra clearance for oil to get into as much as possible.
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02-02-2023, 10:26 AM #19Scream And Fly VIP
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The OMC crossflow was not the only engine OMC used this style of ring. Example would be the 3.5 bore 86/7 90 degree looper, they used the same ring as the 3.5 bore crossflow and same design as the 3.625 bore version. The engines with a lower top ring had very little trouble with these and most of the high ring version piston it was more of a locating pin issue that allowed the ring to spin hook a port and then rip the top ring groove off. On any of my race engines using these rings we actually ran less clearance to keep the piston as straight as possible in the bore to minimize side load on the ring.
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Instigator thanked for this post
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02-02-2023, 02:24 PM #20
Racer is Right as always.. 3.5 86/87 piston
Last edited by H2OPERF; 02-02-2023 at 08:51 PM.
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02-02-2023, 03:43 PM #217000 RPM
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03-04-2023, 06:17 AM #225000 RPM
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That ring was called a L ring bad part of the design wasn’t ment for high rpm the ring would get too hot from combustion temp directly on the ring causing it to expand an warp into port causing failure mainly used in 74-77 cross flow engines 78 they used keystone tapers upper rings were lowered on the piston 200ths and in 80 they used for both upper an lower an continued for this till the end of production
Last edited by MrG; 03-04-2023 at 06:21 AM.
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03-04-2023, 03:25 PM #23Screaming And Flying!
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Always heard the opposite true, low RPM lugging, not hot cleaning burn results in failure by build up.
Since most didn't use the potential it was problematic and dropped along with psi.
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03-04-2023, 04:12 PM #24
Yes, part of the draw of the dykes ring is the large face to transfer heat out of the ring and into the cylinder wall... which let them put the ring higher on the piston.
We gas ported some 4S kart pistons and it work great for power but the ring life was terrible in cast iron cylinders. Then we nic'd some aluminium bore motors and the rings lasted longer even with the gas porting.
Let's just go ahead and make America great again!
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Instigator liked this post
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