Chainsaw Repair

Chain - Grinders - Filing - Wood Milling - Tools - Welding - Machinist - Mowers - Tillers => RC Radio Control - other small engines => Topic started by: 660magnum on November 23, 2013, 03:10:19 pm

Title: 150cc Four stroke 3 cylinder
Post by: 660magnum on November 23, 2013, 03:10:19 pm
Made in Germany by Kolm

http://www.youtube.com/watch?v=hswzQx3D0GA

Inline twin of the same series

http://www.youtube.com/watch?v=PbJSI4GHPG4
Title: Re: 150cc Four stroke 3 cylinder
Post by: 3000 FPS on January 26, 2014, 06:27:20 pm
That twin sure has a nice sound to it.   
Title: Re: 150cc Four stroke 3 cylinder
Post by: 660magnum on January 26, 2014, 06:57:43 pm
That's because it has unevenly spaced firing. the uneven firing makes the engine sound a little like a Harley.

If you think about the fact that this is a four stroke, the uneven firing set up is probably the best way to approach dynamic balance?
Title: Re: 150cc Four stroke 3 cylinder
Post by: SDB777 on January 26, 2014, 09:18:33 pm
So this is going to have a 16" bar with full comp and be running an 11 pin?

Might have to put the 'fan' on a shelf during the competition....





Scott (just saying) B
Title: Re: 150cc Four stroke 3 cylinder
Post by: 660magnum on January 28, 2014, 03:27:28 am
Here is a video of the four cylinder 300cc in a aluminum Mustang. I think it has a resonating muffler.  Has been posted on here before. This is in Germany near the Austrian border.

Turn your sound up high so you can hear it!

http://www.youtube.com/watch?v=5PnJkBl0Ql8
Title: Re: 150cc Four stroke 3 cylinder
Post by: Randy Mac on January 28, 2014, 11:51:05 am
My neighbor had a Honda 125 twin, neat little bike, it really wound up, I got it to 75mph.
Title: Re: 150cc Four stroke 3 cylinder
Post by: 3000 FPS on January 28, 2014, 12:38:41 pm
No matter how many times I watch and listen that plane sounds like it is coming in for the kill.
Title: Re: 150cc Four stroke 3 cylinder
Post by: 660magnum on January 28, 2014, 12:44:21 pm
The P51 plane design might have originally been American but that model airplane, multiplex radio, Kavan accesories and Kolm engine engineering and construction are German from one end to the other.

The Doppler effect really plays strongly in the sound.
Title: Re: 150cc Four stroke 3 cylinder
Post by: Eccentric on January 28, 2014, 02:01:52 pm
That airplane sounds absolutely fantastic.
Title: Re: 150cc Four stroke 3 cylinder
Post by: 660magnum on January 28, 2014, 02:08:09 pm
You guys got me all stirred up again. I'm going to have to go back and listen to it again.
Title: Re: 150cc Four stroke 3 cylinder
Post by: Cut4fun on January 28, 2014, 02:41:50 pm
Man if it sounds that sweet on video, imagine what she really sounds like being there.  Sweeeeeeeeet   :P
Title: Re: 150cc Four stroke 3 cylinder
Post by: 660magnum on January 28, 2014, 02:57:26 pm
You and I need to go out to the field some pretty day and see some of those planes and engines up close.

You don't really need me. Just you and your son go out there some pretty day when you hear them. 
Title: Re: 150cc Four stroke 3 cylinder
Post by: sharkey on January 28, 2014, 04:31:54 pm
Sounds great.  Any idea how the engines are lubricated?
Title: Re: 150cc Four stroke 3 cylinder
Post by: 660magnum on January 28, 2014, 06:23:28 pm
They run oil in the gas just like your Stihl (50:1) and the oil in the blow-by (past the piston/rings) oils the bearings in the bottom end.