4 stroke exhaust temperature  
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4 stroke exhaust temperature - 6/12/2007 7:43:25 AM   
Bone



Posts: 332
Joined: 3/15/2002
From: GraftonNSW, AUSTRALIA
Status: offline 		A simple question: why are the exhaust temperatures in our 4 stroke model engines hotter than the 2 stroke engines?

Given that the 4 stroke engine fires every 2nd revolution, one could conclude that the heat should not be as great. I base my question on personal experience. The tank pressure line connected to the exhaust header on my Saito 45 has become darkened & is quite brittle whereas the line on my OS46SF has remained the same colour & retains its flexibility.

I'm not too interested in how much hotter but why it is hotter.
       Post #: 1

RE: 4 stroke exhaust temperature - 6/12/2007 8:04:12 AM   
More HP



Posts: 241
Joined: 11/8/2002
From: Bandon, OR, USA
Status: offline 		Isn't it a more concentrated/dense and efficient charge in the 4s?

The two stroke always has remnants of the exhaust from the last rev in the cylinder.

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(in reply to Bone)
       Post #: 2

RE: 4 stroke exhaust temperature - 6/12/2007 8:13:33 AM   
Bone



Posts: 332
Joined: 3/15/2002
From: GraftonNSW, AUSTRALIA
Status: offline 		Yes HP, perhaps the incoming fuel charge on the 2 stroke helps cool the exhaust gases & the cylinder. And as this happens twice as often on the 2 stroke engine as opposed to the 4 stroke engine = more cooling effect. Seems logical.

(in reply to More HP)
       Post #: 3

RE: 4 stroke exhaust temperature - 6/13/2007 11:22:44 PM   
chevy43


 

Posts: 1023
Joined: 6/9/2006
From: Santa Cruz, CA, USA
Status: offline 		How about the fact that a typical two stroke mufler is waaay bigger and has cooling fins too.

(in reply to Bone)
       Post #: 4

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