Soooo.... been quiet while I was on holidays..

Had a great time and was a relaxing break. Got some time to do a bit of thinking and figuring and hope to get a bit of shop time to try a few things.

First - I spent some time thinking about the Venturi area of the TBI carb - THEORETICALLY.. it was a bit big based on the measurements of 0.40/0.45 size carbs I have on hand. With the lack of a full span spray bar it had as much area as the stock ST carb (big) and more than a 4D OS carb. As a quick trial I have built a Delrin insert and squeezed it down to 5.7mm which I scientifically calculated using a very complicated formula. Actually just an average of .40 size carbs I have and deduct about 15% for the conversion to gas.. Hope to get a chance to test and tune tomorrow to see what it changes. I had no shortage of top end with the setup and would even give up a bit to make it easier to tune a solid in air mixture that is not overly rich on the ground. If it doesn't work - I can pop the restrictor out and return to normal.

Second - I have put some more thought into the "pressure regulator" and have some ideas on that - I have to complete the test piece and try it out - that will be my next effort.

Stay tuned....


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