This is a bit of an eyeopener as it "changes the game" a bit if we are making a simple TBI carb to fit an engine - We can make it smaller and "accept the losses" for ease of handling and setup. No need to get into fancy pumps or regulators as I think i'm going to find this thing will now run great as is.

This ST in its previous form with the 7mm carb never really lost any power in my estimation - It preformed like a good strong .40 on glow (or even a .45), albeit at the expense of ease of handling. I think we have all run some "powerhouse" engines that made tons of power but were on the finicky side. With the skinnier venturi, the "expected theoretical" power loss is there but the ease of Handling comes back.

things I noticed immediately:

1. Mixture setting was noticeably less critical - 1 "click" on my mix curve produced reactions that had me wishing for a 1/2 click option - Now it takes 5 clicks to produce the same result.
2. the engine can run at full power (static) Without showing signs of heating - even at "leanish" settings - Previously I had to keep the mixture overly rich to keep the heat in check statically.

You are correct Bert - Cubic inches can solve this equation - Like a .50 on gas = a .40 on glow.

The original system of an unmodified carb and inline solenoid still trumps for ease of setup and availability but if we go to lengths to produce a "simple carb" - I think we can make it better by getting the size correct.

Hope to get out flying this week to see if the in air performance mimics the "***** cat" this has become on the ground.

Edit: I guess you can't say "puszy"