Wiseco 372 piston

[Onan18]

If wanting to reduce weight couldn't one use a windowed piston from a 266 or a 268?

 

[Chainsaw Jim]

If wanting to reduce weight couldn't one use a windowed piston from a 266 or a 268?

This is what I've done to a 372 piston to lighten and open it up. It also allows you to raise the transfer tunnels for increased flow.

 

[mdavlee]

I don't like Windows in them myself. I've tried it both ways and lost ground to the one without windows.

 

[Deets066]

I've cracked Pistons after not much run time from opening windows too far. I'm not a huge fan of it anymore

 

[Chainsaw Jim]

The windows thing isn't just a windows thing. So much else needs done for that to even be necessary and noticeable.
And a piston will crack after grinding on it if you remove to much in the wrong places. I guess I'll compare it to notching a load bearing beam in a house.

 

[beaglebriar]

I guess I'll compare it to notching a load bearing beam in a house.

Seen that done more than once.

 

[redoakneck]

Says the gen 2 is 14 grams lighter

 

[mdavlee]

14 grams is a big difference.

 

[Adirondackstihl]

14 grams is a big difference.

1/2 oz if my childhood memory serves me correct

 

[mdavlee]

1/2 oz if my childhood memory serves me correct

For a piston it's a big difference. Be a big difference in that too

 

[machine31]

I'd like to see a picture comparison of the Gen 1 piston vs. Gen 2 piston. The picture he shows of the piston looks the same as the old piston and the video on his eBay page is the same video as his old video. I messaged him as to how much popup the Gen 2 has and he said it was 0.035". That is exactly what he stated the Gen 1 had. The write ups I read of the piston showed very little boost in compression. I am very skeptical that there is even a Gen 2 piston. I really really want one but I want a definite bang for my buck and boost in compression.

 

[mdavlee]

The lighter part has me intrigued. The pop up don't matter. I can cut squish to get way more compression than I need.

 

[redoakneck]

I agree, for that many clams, I want a picture. Wierd that it doesn't show two options when you purchase, gen 1 or 2???

They have to be different if the weight is 7 grams different between gen2 & gen1, yep quarter ounce, ....

 

[RIDE-RED 350r]

Lots of little places a piston can lose weight that all add up.

1/2 ounce is significant though, especially for our dinky little saw pistons. Any loss in weight is multiplied when it is put in motion.

 

[Jughead]

You guys see any benefits to the ceramic hybrid bearings?or full ceramic.looks like the full ceramic ones would easily chip or even come completely apart causing mass destruction.

 

[mdavlee]

A few people like those bearing for less resistance and no break in. I've never tried any so I can't say for sure. I may do that soon though.

 

[Jughead]

I've been thinking about it.mighty expensive though.

 

[Jughead]

Hey Mike I need to come over and meet up with you before long.Rattler too.

 

[mdavlee]

Yep. It's not too far

 

[redoakneck]

Curious too if the ceramic is an advantage.

I've heard they are made for super high rpm applications, saws are considered slow??