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4 stroke engine performance and OAT

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Jason Omelchuck

Joined: 07 May 2009
Posts: 120
Location: Portland Oregon

Posted: Mon Aug 10, 2009 7:11 am Post subject: 4 stroke engine performance and OAT

I have a question For all of you running 4 stroke engines out there.    

   

I have my (Yamaha) engine propped so I see about 8000 RPM on climb out on nice cool 65 degree mornings.  I have noticed that on days when I fly and it is 80 or so, that the engine will only reach about 7600 RPM on climb out.  Is this the same thing you see with your 912’s, HKS’s and VW’s?  

   

Jason  

MKIII Yamaha 4 stroke Genesis 120 (snowmobile) powered  

Portland, OR  

       [quote][b]

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neilsenrm(at)comcast.net
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Posted: Mon Aug 10, 2009 9:12 am Post subject: 4 stroke engine performance and OAT

Jason 

  

I don't notice any RPM reductions with my VW powered Kolb on hot days but there is a reduced climb rate. 

  

Rick Neilsen 

Redrive VW Powered MKIIIC 



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aslsa.rng(at)gmail.com
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Posted: Mon Aug 10, 2009 10:18 am Post subject: 4 stroke engine performance and OAT

Jason, We had a relatively mild July with few days over 100 and generally

low winds so I got to fly my HKS in more 90 + degree weather than the last

two years. I don't see any RPM degradation with temperature, just as Rick N

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