I have also used the zenith for a number of years and found it to be very reliable and predictable. On my new KR I started with a Revflow, but never could get it to run consistently. I did have the Tornado device behind the carb. I tried a number of different needles, but it would stumble somewhere in the range between midrange and full throttle without large changes with the mixture control. I was also fighting with vapor lock for a while. It gets very hot in a tightly baffled KR when sometimes you have to taxi 3 miles to get to the active runway. It is nice to have a 10,000 ft runway to flight test off of, but it does give time for the heat buildup in the cowl when the wind favors the other end of the long runway. Once in the air I have cool air blowing to a shroud around the gascolator and anything else that is sensitive to heat. I solved the vapor lock by insulating all the fuel lines well and by fabricating a return line from the carb back to the fuel tank so the fuel doesn't have time to heat soak under the cowl.
I have installed a Tillotson HD carb that has no fuel bowl but uses a pressure regulator like the Ellison uses and yes I set it up with a speedometer cable for the mixture control. I am using a 1.5 PSI electric fuel pump in the system. So far I am very happy with this setup. I tried the Tillotson because I had it on hand and I didn't have to modify the cowl to install it. It is a 37 mm carb, so it is a little large for a 2180 VW. The engine runs consistently through out the throttle range. It does run a little lean at full throttle so I have to turn the mixture richer and then back for cruise, but no stumbles. It runs well enough that I have actually caught myself enjoying the flight instead of worrying about the operation of the engine. I think a fuel pump with a little more pressure, say 2-4 PSI could solve the full throttle lean problem. Maybe someone has some ideas on this. Fuel distribution to the cylinders seems to be much better than with the Revflow. As I have said before, I will go back to the zenith if this proves to be not so good. Roger Bulla rbulla2 at wic.net -----Original Message----- From: Pat and Robin Russo via KRnet Sent: Wednesday, May 21, 2014 3:25 AM To: Mike T ; KRnet Subject: Re: KR> Carbeuretors That zenith carb sold by Great Plains is VERY suitable for VW power. I have used them on 1800 to 2200 CC engines with excellent results and reliability. Trust the experience and expertise of Steve Bennet of Great Plains. Pat Russo -----Original Message----- From: Mike T via KRnet Sent: Tuesday, May 20, 2014 11:00 PM To: danrh at windstream.net ; KRnet Subject: Re: KR> Carbeuretors Is the Zenith carb that Great Plains sells NOT suitable for VWs? Mike Taglieri > > > > > > _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
