No can of worms at all .... Some race dyno numbers, some race on the water getting a personal opinion of what runs best.

One thing that is a constant is that Automotive pump fuel is GARBAGE !!
The methanol or ethanol blended in just wreaks havoc with the carbs and draws in moisture causing corrosion of metal parts.

Camp fuel or race gas which ever works in YOUR opinion beats the heck out of pump station gas

Hi Oz! I think that it is sites like this that helps get the gray matter working! So much depends on alt,weather cond,ect.If you find some thing that works for you..RUN IT! If a boater says his set up runs x mph and you try it and get close,well then,you have gained knowledge.You should check out some of the clips from INSANE.speed runs are "awsome"! I think CC has some also.

Guys,
No can of worms here either, just sharing information and opinions on each of our own experiences. Scott is right in the fact that the gas station fuels are terrible and there is no reason for not looking for an alternative. He is also right in saying that some people race dyno numbers, some race on the water getting a personal opinion of what runs best. I choose to do both so that there is less flaw in any information that you might want to share with others. The cool thing about the dyno is it is a great tool that you can use to have a controlled test where wind, driving and water conditions really have no effect on your results. It is my opinion and I truly believe that the dyno is an invaluable tool for anyone serious about modifying engines and that it will teach you more in a short time then you can ever learn with on the water testing. I know for a fact that sometimes what you think is faster on the water really isn't and it will make you progress backwards instead of forward. Like I said in the earlier post there was a guy on Jim's Rc boat dock who did the same testing as I did except at his local pond with different fuels and had the exact same results as I had and we did not even know each other. Hopefully you can do a search and find that information also.

The original questions with this post was will there be any bad effects to my engine if I were to run Avgas two stroke fuel and will the mixture need to be tuned to the higher octane fuel or will I need to completely change my timing ??
My answer is if you are using the same (lower octane 101) Avgas that is available at the airport that me and the VooDoo club members are running then I think that it is a pretty good fuel and when mixed correctly with 8oz of oil should be a great alternative to station gasoline especially if you are getting it for free. We have not needed to change our tune at all since switching to the Avgas. I hope that helps in determining whether you use it or not.


HMETALH,

Here is a couple of clips that I put on YOUTUBE from the last Straight Away trials at Legg Lake. I had Mark and Chris Grimm build me a Rigger that we could put some of my engines in and go after the NAMBA G1 record which at the time was 99mph. We started the weekend with a normal CC Racing Pro Mod engine that we sell everyday and went as fast 104.8mph with a standard heat race engine. We then put in a engine that was more designed for going straight and fast and we went as fast as 106.5mph we ended the weekend with the record and a 104.9 average. We know there is more in the boat and ultimately would like to try and go over 110mph.

Damn thats fast! Well done to you and all that were involved! A world record is surely something to be proud of. Hmmmm makes me think back to my original idea of running one of my custom pulse jet engines in something!lol

The only problem with 101 octane AVGAS is NAMBA rules say 100 octane max in G1 but I'm not sure about GX1. I don't know if you can check the difference between 100 and 101 octane, but it would suck to have 4 first place finishes and then be disqualified for your gas being 101 octane.

Besides, you could be on the water with a boat that is 20 MPH faster than the competition, but if you can't drive, what good is it.

The records above were set with regular pump gas. You are correct Steve, the NAMBA rules would not allow the higher octane fuels.

This is true, but it is a poor argument that everyone seems to turn back on when we are talking about things to make boats faster...especially when rules and such come into play. The fact of the matter is if you have all the best in your boat and the other guy doesn't, YOU have an advantage over him, PERIOD. Whether you can make good use of that advantage or not is another story, but you still have it. That's the same as the "setup setup setup" argument...please don't get me started on that one! ha ha!

I havent been here very long but I have to say that all the info and advice that you guys are willing to put foreward and share is invaluable. I am truely glad I found this site and joined! Back to work today, now I can get all my hardware finished and get my first boat in the water. I love having access to all the good tooling and materials.lolB)