roller wave pistons

[banishedmunk]

Im looking to do a shortblock build and was wondering if anyone has any experience with the roller wave pistons. A friend of mine swears by them but he uses them in his honda the pistons look impressive in my opinion. Just wanted to know everyones two cents

 

[Defiant]

No feedback. I've always been a bit curious, in the interest of swirl, why no one staggers the timing on the intake valves so they don't move together. But if you're using forced induction, it's kind of a waste of time anyway.

 

[banishedmunk]

The piston design alone is interestin with the elongated exhaust valve depressions im interested to see how they react to high boost levels

 

[livedsm4g63]

i was looking at them as well, but i never found much feedback either. so i dont think im going to go with them and just get some wisecos which have been proven.

 

[banishedmunk]

if a sohc 1.5L honda can put down 735hp and 478 tq then i do believe that im sold and that alone is testimony to me

 

[knochgoon24]

Yeah, the design is rather unique.

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That's the image they have on their website for the 4g63/64 pistons. Quite odd.

 

[ZmanIV]

Yea it is quite odd, it looks like a piston to me.

 

[casperfast]

it just looks like a high compression smooth form design. i dont think it would work too well on a turbo set up. verry nice looking pistons. i wonder how they hold up to high pressure though

 

[AshTsi]

I got the total opposite of what you got from looking at the picture. If anything to me it looks like its almost the same dish hight its just missing the wall all the way around. That to me would make the combustion area larger because the piston doesn't have a complete dish therefor creating more space? But im not sure

 

[knochgoon24]

Here's a pic of the F/I and N/A pistons for a 2002 Eclipse. It seems the F/I ones are flat/depressed while the N/A ones are peaked for higher compression.

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This is the site I've been getting the pics from. The Old One - Energy Dynamics : Components : Forged Pistons

 

[Defiant]

I'd say it seems the crown's machined-off the turbo pistons in order to drop compression ratio. But then, I'm a cylinder-half-full kind of guy.

 

[rarson]

If you read through some of the info on the site, he says that the pistons are designed to bias the air/fuel mixture towards the exhaust valves.

 

[Defiant]

Yeah, read it. And I wonder if it's a good idea, why it's not what's routinely done by others. Or just maybe, with a dual-intake setup, it doesn't matter enough. Or, any.

 

[rarson]

I think Larry is onto something, but I think the reason why it's not done more often is because regular pistons already work well enough for most people. And also, it's his own "experimental" design (not really experimental at this stage anymore, at least not for Hondas, but it's still proprietary). I doubt too many manufacturers are really looking to screw around significantly with piston designs the way he has when they can just throw some shelf slugs in and call it a day.

He's got some interesting porting techniques, too. I kind of stumbled upon the whole anti-reversion porting thing when I gasket-matched my exhaust manifold. The head ports are untouched (so there is a large step). Unfortunately, I made some other changes at the time, so I can't say what the porting did, but my car does run like a raped ape. So I'm going to stick with my screw-up until I move away from a non-Mitsu turbo (, probably not in this decade, I've already been running the small 16g for 6 years now).

 

[haioku-rocket]

popular in the Honduh world they are.

 

[banishedmunk]

Bringing the thread back from the dead. I was wondering if anyone ever decided to try these pistons out?

 

[dsm-onster]

I'm confused. "swirl" does nothing to push the mixture to one side of the chamber wedge or the other, in this respect. But "tumble" does. . . I was also told that swirl is not very relevent for a multi valve head. Imagine the helix trying to form belind the valves. What the he!! will it do when it gets to the divider between the valve ports. How short of a helix will work to see any appreciable gains?

He's basically loosing quench on the exhaust valve side as a trade off to get better atomization through the heat of the exhaust valves itself. So How much gain can you get from vaporizing the gas better, but still having whats left un vaporized more scattered through out the combustion chamber?. . .