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« on: September 07, 2018, 07:53:18 PM »
I have a question about nozzle holders and the air bleed holes in them. This is not a typical system. I have been messing around with Waterman/Mitchell injectorator systems for a while. The waterman nozzle holders have two 1/8" holes in each nozzle. Last time we ordered a nozzle holder it had no holes in it, Waterman told me they are not necessary. We ended up drilling the holes to match the rest. Well for many years we fought high idle rpm due to how much air they pull in. It is a throttle body deal with accelerator pumps so you can run the idle lean and have no stumble. Well a few years ago I taped them off for an idle only test. Low and behold we could adjust throttle body and make idle speed below 2k rpm. Well my father has the same system on his engine and I talked him into plugging the holes. Now the idle circuit is much easier to tune in my mind. It was tough to not be very lean on the idle circuit before, now is much more adjustable. The question I have is now I have been told in a N/A engine the holes are there to atomize the fuel delivery better. Is it really that important or can we just run the system as it is? At one point we had a mix of nitro that was told to be 10% but the crackle it had made me think it was more, the problem I had was I could not give the motor enough fuel at idle to keep the lean chirping to go away. Nitro guys will understand. I have not put the same mix back in the motor but I think it would be much happier with the plugged nozzles. So do we need the holes or can they stay plugged? The nitro deal was just fun but maybe try it again someday when the tune up is figured out. Sorry for the long post but I would like everyone's opinion of what is right and wrong. Thank you Greg S.