You didn't say if you have in flight mixture control or not so I don't know if you were adjusting the mixture on the ground or in flight and this may or may not apply to you.
I had a 2180 with the 1821 carb. I found that that carb would run rich at mid throtle and lean at full throttle. I verified it with an oxygen sensor and mixture meter which tells you a lot more and a lot faster than the EGT does. You may be having the same problem with the mixture changing as you move the throttle like I did. I had in flight mixture control so I was able to manage it. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Stanley Mello Sent: Monday, January 02, 2006 3:44 PM To: kr...@mylist.net Subject: KR> High EGTs Hey Guys, Need some ideas on how to fix a problem. I am flying a VW 2180 with an 1821 carb and a KR intake sytem from Great Plains Aircraft. My compression ratio is 6.9 to 1 with standard cylinder heads. My problem is that at cruise my EGTs run 1500 to 1800 degrees on all cylinders while the CHTs are normal at 350 to 375 degrees. My EGT Gauge is a WESTACH with the probe sensors installed 6 inches from the exhaust port on the heads. I can enrichen the fuel mixture until the engine starts to missfire and then lean just a little and the EGTs still run up there in the 1500 to 1800 degree range. I finaly burned an exhaust valve. My CHT gauge is also a WESTACH system. I seem to remember someone else had a similiar problem a while back. Also has anyone used an intake system other than the Standard KR intake used by most builders? It seems to me that there is to much tubing in the multiple pipe system of the KR type intake for low RPMs used in aircraft causing the fuel to condense and create poor automization or vaporization all the way to the combustion chamber. Would not a single pipe have more velocity at the low RPMs. A beach buggy turning 5 to 8 thousand benifits from multiple intake pipes but I am not so sure about the 3 to 35 hundred range. I would like to hear everyones thoughts. THANKS, STAN KR2-M _________________________________________________________________ Dont just search. Find. Check out the new MSN Search! http://search.msn.click-url.com/go/onm00200636ave/direct/01/
