Piston and rod balancing

[BarryStrawn]

Actually a pair of lake lice Rotax's would work better and be easier than the old Evinrudes.

Terrible weather today. Barely got to 70 and there was a breeze. Almost put a long sleeve shirt on.

[olboatman]

Yeah, one of GM's better ideas. Along with the Vega inline 4, diesel Olds V8, door pulls that remove themselves in your hand and that ever popular flaking water based paint. The taxpayer bailout being number one. I hate that company!

Need "Like Button" Gary

[pointer]

Actually a pair of lake lice Rotax's would work better and be easier than the old Evinrudes.

Terrible weather today. Barely got to 70 and there was a breeze. Almost put a long sleeve shirt on.

Lake Lice? Sea-Doo?

pointer

[Markus]

Of all the piston driven engine designs derived from steam to present , only the cross-plane V8 can be counterweight balanced ... Humm ... you must own one of them new "Wikipedia" balance machines ...

No. I am an engineer. I understand things like equations and the difference between torque and horsepower. My bookshelf includes this:

http://www.amazon.com/Internal-Combu...+engine+design

[a.m]

Attachment 313596
Here is my rig for balancing this small 1.05cid RC boat racing eng.
It spins at 260000+ RPM
The bob is 52% of the piston rod and needles.

Forged steel rod running on needle bearings.
Not so much of a toy as you would think.
Made a big difference in the reliability and RPMs of the eng.

I am sorry, but i hope your statement of running 260000 rpms is a typo ;-) Couse there is no way that engine spins that rpm. A one cylinder engine can not be balanced. The one cylinder engies is worst there is. On a 1 cylinder engine, you can achive a balancing factor. say 50%, were your rod, pin piston and clips is the same weight as the counterweight. A one cylinder engine, meets it own harmonics, and it will need a considarable amaount of power to overcome that harmonic. When you change the balancefactor of the 1 cylinder engine, you also change the harmonics. When that changes, you can achive higher rpms, ie more HP. Alot of the small rc 0,21 ci enignes spins over 50000rpms in cars, and the put tungsteen slugs in the counterweight of the crank to change teh balance factor. I have tuned alot of theese small engines, and you can match ports, change, timings on the crank or ports, squisch angles, cumbustion chambers ( shapes and cc ), singhgrooves, but as long as your standard crank is not slugged, or changed in other ways, you simply do not achive the same rpm. You can get it a bit higher, but not to the level of a crank with higher weight than standard. It also means something were you put it.

Look at this link, and you will find some amazing sylinders and one sylinder cranks.

http://www.novarossi.it/2012/index.p...virtus-21.html

[dwilfong]

Yes this eng dose over 26000RPM's My Eagle Tree data logger is a great tool for tuning.

https://www.youtube.com/watch?featur...-ts=1421914688
Here is a boat I set up in open water testing last week at the Orlando Winter Nat's.
My eng are far from stock and in a class by them self.
The 1.05 I refer to is my own Franken eng the only one in existence.
The one in the video is a 1.01 turning a few RRRRS.
The custom made billet pistons are my design and also the one of a kind full complement ceramic hybrid bearing on the crank.
Have already gone around and around on you can't balance a single cyl eng. yes it is a compromise at best.
52% is the best it will be from many test by many people in the know.

[wired247]

He was referring to the factor of 10 you were off. Initially it was 260,000 RPM. Now its 26,000 RPM. Commas come in handy. This is why the Metric system isnt all that great. As NASA knows its easy to have a zero off one way or another.

Yes this eng dose over 26000RPM's My Eagle Tree data logger is a great tool for tuning.

https://www.youtube.com/watch?featur...-ts=1421914688
Here is a boat I set up in open water testing last week at the Orlando Winter Nat's.
My eng are far from stock and in a class by them self.
The 1.05 I refer to is my own Franken eng the only one in existence.
The one in the video is a 1.01 turning a few RRRRS.
The custom made billet pistons are my design and also the one of a kind full complement ceramic hybrid bearing on the crank.
Have already gone around and around on you can't balance a single cyl eng. yes it is a compromise at best.
52% is the best it will be from many test by many people in the know.

[dwilfong]

260000 rpms dang I missed that 0 all that for nothing story of my life LOL

[Mark75H]

No. I am an engineer. I understand things like equations and the difference between torque and horsepower. My bookshelf includes this:

http://www.amazon.com/Internal-Combu...+engine+design

My book shelf has this

http://www.amazon.com/High-Speed-Int...=harry+ricardo

[Onetime]

This is almost turning into dueling swords. Waiting for the two "engineers" to go at it!

Another good one: http://www.amazon.com/The-Design-Tun.../dp/0837601401

[BarryStrawn]

Lake Lice? Sea-Doo?

pointer

Yes, "lake lice" is slang for a personal watercraft.

Maybe I should post some slang terms for "engineers". The kinds without P.E. after their names.

[Mr. Demeanor]

Friggen half wits. This is on my bookshelf.
http://www.amazon.com/Little-Engine-.../dp/0448463598

[Onetime]

Friggen half wits. This is on my bookshelf.
http://www.amazon.com/Little-Engine-.../dp/0448463598

Thats funny! Read that book to my kids for many years.

[dwilfong]

So let me ask has any one seen a two stroke eng run with no intake valve system?
Thy call it a 24/7 eng. The intake track is open to the atmosphere all the time.
Many have theorized and said it will not run.
O and I am gust a grunt mechanic no engineer never gots me a education after HS.

[rock]

Friggen half wits. This is on my bookshelf.
http://www.amazon.com/Little-Engine-.../dp/0448463598

Now that's funny. Thanks. Great way to start my day.

Rock