Single ring piston?

[Crasherfromwayback]

Top show!!!

[Conquiztador]

Fit a "Total Seal" ring and you have the best of both worlds.

http://www.totalseal.com/

[speedpro]

My old Moriwaki pistons only used 2 rings. The top one was a Dykes type and the other was a conventional oilcontrol ring. The dykes ring had practically no tension when fitted and the whole motor was easily turned over in comparison with either standard or yoshimura motors. Lots less friction.

[F5 Dave]

But that would be irrelevant. The static friction is supposedly inconsequential as the rings are forced into the walls by the gases, the dykes ring being designed specifically for this.

[speedpro]

But that would be irrelevant. The static friction is supposedly inconsequential as the rings are forced into the walls by the gases, the dykes ring being designed specifically for this.

According to the books.

According to the engine, Yoshi pistons out 'waki pistons in and monster 'waki cams as well, it was noticeably easier to turn over. I spent plenty of time turning that motor over by hand getting things degreed just right so had a pretty good idea how it felt. My current turbo engine with JE pistons & whatever rings they came with is the hardest engine of the lot to turn over. Possibly once running that friction I feel becomes irrelevent but I think it probably increases by some factor but with different start values. The turbo engines heats up really quickly just running it in the pits for example.

[pete376403]

Taking the Dykes ring concept a step further, at least one engine builder (Grumpy Jenkins, small and big block Chevs) used gas ports drilled from the top of the piston to the back of the top ring land to increase ring sealing pressure, however in the class he was running (pro stock) it was not allowed as it was considered a "modification to the upper surface of the piston.

Can't understand why the turbo motor should be harder to rotate - actually would have expected it to be esier, as your static compression would tend to be lower

[speedpro]

I'm talking "plugs-out". It's hard enough getting the cam timing exactly right without leaving the plugs in when I'm turning the motor over.

[Motu]

Keystone rings make use of gas pressure behind the ring more effectively too,plus they keep the groove clean and work better when worn than standard square rings.Used on diesels a lot.Probably the best ''standard'' ring design there is.Then there are the fancy ''gapless ''rings,stepped and tapered.