Torque, RPMs, Porting...My Philosophy

[Trx250r180]

Ain't we beat this into the ground already?

Just build a saw that nets good solid, and repeatable gains. Make it last, and you'll have happy customers.

What's the big deal?

It ain't rocket surgery.

ummm............ you need to make an appointment to post in this thread sir ......

 

[Mastermind]

Don't make me get all torqued up on yer ass.

 

[WheresWally]

Not a problem at all. I just like a hotrod. Hotrods don't operate at low RPMs. Notice, I didn't say race car. A hotrod street car needs to make power across a much wider power band than a race car.

Haha, i like this, but a true hot rodder wouldn't be playing with a die grinder, save yourself the time and start producing the snellerod, ms880 motor in an ms170 chassis... should be a winner on all levels.

 

[mdavlee]

all time favs.........early 044 and 064, i have the most time on um probly.
power? 288 ranks right up there, i just never liked the controls or feel of husky.
5200 and 056 were monsters for the wood here, you could lean hard on um. but who wants to carry them things today lol.
the 461 is quickly becoming a new favorite......just not for 30"+ falling.

You port that puppy and it will probably be all you want unless you need a 36-42" bar.

 

[Mastermind]

Brad has stuck a few saws in my hands at GTGs that made me think holy crap......that saw is fast. He can and does build some real good saws.

We might have a little bit of a different approach to porting a saw.......but to that I say thank goodness.

The world would be a boring place if we all did things the same way.

Carry on with your bad self B'Rad. I enjoy reading along.

 

[tlandrum]

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< squirrel

 

[chadihman]

Some of you guys got my head spinning. Its pretty simple. Torque is just load. HP is what rpm it can handle the load. If you know the torque at every rpm you know a lot about the engine. I'll try and get a line graph up with torque and hp on it.

 

[old-cat]

Ain't we beat this into the ground already?

Just build a saw that nets good solid, and repeatable gains. Make it last, and you'll have happy customers.

What's the big deal?

It ain't rocket surgery.

It's not "rocket surgery" It's BLACK MAGIK

 

[Haywire Haywood]

MO

Part of the purpose of this discussion is to change the focus from torque to power. Torque is only half of the equation. My goal is to broaden the torque curve and move max HP to the right.

Moving Torque to the right IS moving HP to the right. If you have a saw that makes 10ft/lbs at 10k rpm, and after porting it makes that same 10ft/lbs at 12k rpm, you have increased HP.

Don't banter with an idiot Brad, a short read in the Dyno thread would tell ya that I have no idea what I'm talking about when it comes to torque, HP, and RPM. LOL

 

[mt.stalker]

It's not "rocket surgery" It's BLACK MAGIK

Nope , Black Magic is a pipe on an Arctic Cat ;-)

 

[Chris-PA]

Some of you guys got my head spinning. Its pretty simple. Torque us just load. HP is what rpm it can handle the load. If you know the torque at every rpm you know a lot about the engine. I'll try and get a line graph up with torque and hp on it.

If you have a plot if torque vs. rpm or hp vs. rpm you can easily convert from one to the other. But power is what does work - in Europe (SI units) horsepower is measured in Watts, just like for electricity. And if you put out a certain horsepower for a given amount of time that is a measure of energy, just like Watt-hours ("hp-hours" is an obsolete unit).

If you have an engine that put out 5hp at 10,000rpm and one that puts put 5hp at 12,000rpm, which can do more work? Neither, they can both do the same - it's like asking which weighs more, a
pound of feathers or a pound of marbles?

 

[Haywire Haywood]

But... the 12k engine wil have less torque at RPM, so it will act "peaky"..... right?

 

[Mastermind]

http://auto.howstuffworks.com/question622.htm

 

[CR500]

Not any more sadly... most kids would not know anything else besides Speedwerx lol

Sent from my non internal combustion device.

 

[Hedgerow]

But... the 12k engine wil have less torque at RPM, so it will act "peaky"..... right?

Sort of.. But if geared the same, will most likely cut faster if not dumped on it's nose in the cut...
But... lotsa variables.. Gear up the other one and they should be dead ringers... In theory of course..
Since they put out the same exact HP... Which as Chris states, is the ability to do work.

 

[MarkEagleUSA]

It ain't rocket surgery.

Even a monkey can do it!

 

[Chris-PA]

But... the 12k engine wil have less torque at RPM, so it will act "peaky"..... right?

Yes, it will have less torque there. Mostly it would feel weak, because if you wanted to raise chain speed under load (by 20% in this case) you need 20% more power there.

Peaky is caused by the shape of the curve - if the power falls off abruptly below the max rpm.

 

[Mastermind]

I just build saw engines that sorta chug along at a slow, but steady rate of speed.

I'm happy about that too.

Does that mean I'm a weirdo?

 

[treeslayer2003]

You port that puppy and it will probably be all you want unless you need a 36-42" bar.

that may be in the planning stages.......

 

[treeslayer2003]

I just build saw engines that sorta chug along at a slow, but steady rate of speed.

I'm happy about that too.

Does that mean I'm a weirdo?

yes........but a dam good one lol.
you took a free moment i see. Jon on his way back yet?