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Hot CHT and fuel flow

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Mar 31, 2010 5:45 am Post subject: Hot CHT and fuel flow

That rule of thumb is just a bit rich. My 200hp fuel injected IO-360

Lycoming flows about 17-18gph on takeoff with EGT and CHT where they

should be....1200-1250 and 340, with a fuel flow unit on EI UBG-16.

16-17 gph should be plenty for 180hp engine.



On 3/31/2010 5:32 AM, Mark Frederick wrote:

 	  Quote: 	
		   "Do you have a way to monitor your Gallons Per Hour? If so do you know

 what your putting through on take off? I see about 15 gph on take off

 climb. I did slightly enlarge my jet but did not want to go too far."



 Rule of thumb applies here: 1 gal for every 10HP (at) sea level (at) full RPM

 (at) std temp. If you have a 150HP engine, 15GPH is about right. Look for

 18 on a 360 engine.



 Another check is to see if you can get 250 ROP at full rated power. If

 not, make the appropriate changes.



 I suspect more than a few cooling issues are actually fuel related.



 Carry on!

 Mark

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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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