Author Topic: 150cc Four stroke 3 cylinder  (Read 1422 times)

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Offline 660magnum

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150cc Four stroke 3 cylinder
« on: November 23, 2013, 03:10:19 pm »
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Re: 150cc Four stroke 3 cylinder
« Reply #1 on: January 26, 2014, 06:27:20 pm »
That twin sure has a nice sound to it.   
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Offline 660magnum

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Re: 150cc Four stroke 3 cylinder
« Reply #2 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?
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Offline SDB777

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Re: 150cc Four stroke 3 cylinder
« Reply #3 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....





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Offline 660magnum

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Re: 150cc Four stroke 3 cylinder
« Reply #4 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
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Offline Randy Mac

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Re: 150cc Four stroke 3 cylinder
« Reply #5 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.

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Re: 150cc Four stroke 3 cylinder
« Reply #6 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.
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Offline 660magnum

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Re: 150cc Four stroke 3 cylinder
« Reply #7 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.
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Offline Eccentric

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Re: 150cc Four stroke 3 cylinder
« Reply #8 on: January 28, 2014, 02:01:52 pm »
That airplane sounds absolutely fantastic.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline 660magnum

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Re: 150cc Four stroke 3 cylinder
« Reply #9 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.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

 

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