394 vs 395 vs 066 vs 661

[jmssaws]

I just cut a cookie in half today, them notched it with the chain 1/4 way in.

Holds phone sideways perfectly J.

I'm gonna do that,thanks doc

 

[jmssaws]

Biggest bar I will run on her is a 32 lol.

She sounded good!!!! Klotz Benol at 50:1 had to be smelling good today lol

Sent from my non internal combustion device.

VP 93 and benol is the best smell ever.
Smells like victory!

 

[MustangMike]

So Bret, knowing that you also build a mean A$$ 660, and that you have also played with a 661, what is your take on them?

 

[CR500]

We have Crab 91 E free..... sure smells good lol

Sent from my non internal combustion device.

 

[MustangMike]

So Jason, Al, Brett (or anyone else) I keep thinking about those winged KS pistons and wonder if it is possible they help the cylinder perform better.

My thinking is that a piston skirt does not actually seal a port (like piston rings), but that those wings may provide a little additional flow resistance that improves performance.

Anyone think there may be something to that?

This pic shows why I did not use my replacement piston in 044#1, no wings, and the skirt was a hair shorter.

 

[jmssaws]

I'm not sure but I know they add stability.

 

[paragonbuilder]

Damn J, they all run fantastic! A sec here or there, who cares. Which one feels the best for you?

 

[jmssaws]

Damn J, they all run fantastic! A sec here or there, who cares. Which one feels the best for you?

The 661 and 394 feel fast,my 066 feels the strongest.

 

[awol]

So Jason, Al, Brett (or anyone else)
My thinking is that a piston skirt does not actually seal a port (like piston rings), but that those wings may provide a little additional flow resistance that improves performance.

In no way would resistance to flow help improve performance. The whole premise of porting is based on improving flow.

 

[huskihl]

What's all that green stringy stuff on the ground?

 

[jmssaws]

What's all that green stringy stuff on the ground?

Not sure but my cows love it.

 

[huskihl]

Not sure but my cows love it.

Just got back from jeep camp in the yoop. Worst, most slippery 3 hour drive ever


Oh yeah....nice saws

 

[jmssaws]

It's green here,picked a bunch of mushrooms today.

 

[MustangMike]

In no way would resistance to flow help improve performance. The whole premise of porting is based on improving flow.

I think you are missing what I am saying. There is a reason you don't open the ports wider than the skirt, but the blockage from the skirt does not provide a 100% seal. If the wings help improve the seal, they will improve performance.

The intake opens when it clears the skirt, and the skirt blocks the exhaust port when the piston is at TDC, preventing fuel from just leaving the cylinder.

 

[spencerpaving]

So Jason, Al, Brett (or anyone else) I keep thinking about those winged KS pistons and wonder if it is possible they help the cylinder perform better.

My thinking is that a piston skirt does not actually seal a port (like piston rings), but that those wings may provide a little additional flow resistance that improves performance.

Anyone think there may be something to that?

This pic shows why I did not use my replacement piston in 044#1, no wings, and the skirt was a hair shorter.

My take on the winged pistons is just a little better durability over the long haul...they provide more support so you don't get as much piston wear on the intake..how much I don't know...I havnt had any probs with aftermarket pistons either

 

[mdavlee]

The skirts to cylinder wall clearance with oil is sealing pretty good. Only .0015-.002" clearance between them.

 

[Deets066]

The wings by them selves will never close off a port, if so you would be free porting half the time

 

[MustangMike]

I was just thinking it would act as a wider skirt, and was wondering if anyone every checked where they are located at TDC. Perhaps the align over the intake at BDC and over the exhaust at TDC.

I may be absolutely, completely, and totally wrong, but is was a thought that I had.

I think we need Redbull 660 to test a winged & non winged piston in the same jug, with timed cuts, to see if it makes any difference!!!!!!

 

[Deets066]

Extra weight would be the only difference. A piston without wings would probly out perform the winged piston.

That being said the stability of the wings may add longevity

 

[jake wells]

meh give me a 281 or 288 LOL.