Popup vs Flat Top?

[barneyrb]

Well, I don't have a dog in this hunt and probably should stay out or this but here goes. A number of years ago when I was real heavy into car engines (specifically 383 chebbys for a claimer class dirt track) I read an indepth article written by this old country boy named Smokey Yunick. His theory on making the maximum hp from an engine was make the combustion chamber as small as possible and use a dished piston if possible. His theory was with a dished piston all the energy was directed to the center of the piston and in a straight downward force on the rod. He went on to explain that any energy directed towards the edge of the piston was not utilized as well because that energy was actually trying to turn the piston sideways in the bore. Take it for what it's worth but I didn't write the article.

I'll bow out and let the festivities continue.

 

[Iceman]

That's an ambiguous statement. Horsepower a function of both torque and RPMs.

Actually torque means nothing. Torque x rpm matters - that is the definition of power.

http://www.wired.com/2014/04/don-garlits-electric-dragster/

You guys are so far behind the 8 Ball, I'm switching to table tennis.

 

[Mastermind]

Hello Brush Ape.

 

[Duke Thieroff]

To me it don't matter who's right and who's wrong. I could only form a decision based on others opinions and experiences.

I'm a borderline competent mechanic and can understand when there is an issue with a saw and diagnose it.

Could I actually do some R&D on my own or develop something at this point in time without someone close by teaching, I doubt it.

What all this in this thread does say about these two is that they have passion in what they do and an interest in building the best saw possible.

Oh, and by the way....

If someone wants to build a pop up and a cut squish band and send it over to Chad I'll supply the pistons!

 

[Duke Thieroff]

 

[SquareFile]

Who's the fortunate owner of the 346xp test subject?

 

[barneyrb]

Actually torque means nothing. Torque x rpm matters - that is the definition of power.

Actually the formula is HP=TQ x RPM/5252

 

[Duke Thieroff]

Just sold these yesterday.

I'm going to ship em separate....


Whichever one gets there first will prove which ones faster.

 

[jughead500]

Plmcrzy and brush ape were ridin fence and rode upon that.both of them hollered my turn and got off their horses and stuck their head in the fence.

 

[Chris-PA]

Actually the formula is HP=TQ x RPM/5252

Yes, Power = Torque x rpm x a Constant. Which changes nothing.

 

[thomas1]

What's funny is your lathe is about 10 times the lathe as both mine and Randy's....

You should learn to use it....

I'd take yours any day.

 

[Mastermind]

I'd take yours any day.

Go away troll.

 

[windthrown]

I have seen that anyone can make a stock saw into a turd...

 

[thomas1]

Go away troll.

I can't see your posts, I've got you and the other idiot on ignore.

 

[DSS]

You and I.......we just clash.

I'm proposing that we find a way to stop clashing.

Never happen. Your heads too ****ing hard and he'd never let it go anyway.

And those, my friends, are proven facts.

 

[windthrown]

Oh, and by the way....

If someone wants to build a pop up and a cut squish band and send it over to Chad I'll supply the pistons!

And I will pay the winner of this build-off 100 Trillon dollars!


Zimbabwe dollars of course... In Brush Ape we trust!

 

[Duane(Pa)]

 

[DSS]

View attachment 396174

Best poast in this whole damn thread

 

[old-cat]

Don Garlits, the Master engine builder

 

[angelo c]

Well, I don't have a dog in this hunt and probably should stay out or this but here goes. A number of years ago when I was real heavy into car engines (specifically 383 chebbys for a claimer class dirt track) I read an indepth article written by this old country boy named Smokey Yunick. His theory on making the maximum hp from an engine was make the combustion chamber as small as possible and use a dished piston if possible. His theory was with a dished piston all the energy was directed to the center of the piston and in a straight downward force on the rod. He went on to explain that any energy directed towards the edge of the piston was not utilized as well because that energy was actually trying to turn the piston sideways in the bore. Take it for what it's worth but I didn't write the article.

I'll bow out and let the festivities continue.

Wonder how much theory actually applies here in 2 strokes. Having the valves(variable) directly overhead allows for some greater control of the combustion process (then fixed ports).
I wonder how much the gas/oil alone changes the "theory". Back in the day water injection was all the rage.