jon,
MT: Remember MT as the temperture of air goes from cold to hot the more moisture the air holds. This happens because cooler air has more oxygen molecules which aids in better combustion. As the temperature of air increases grains of moisture displace oxygen molecules making the combustion process less efficient. This results in less hp. The grains of moisture make up vapor pressure in the air. As the vapor pressure increases ,the grains of moisture displaces volume in the camber,increasing the compression ratio. The increase in compression ratio will brake and deform glow elements. As air tempertures cools the vapor pressure decreases grains of moisture are displaced with oxygen molecules and compression ratio return to normal and hp increases. The general rule of thumb is between cold/cooler months and hot warmer/hot months expect 10-15 % reduction in HP NOTE: IF EVERYTHING ELSE REMAINS CONSTANT. Hopes this helps. Dan Mccormick
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jon, yes im running the cmb liner in my mac, i dont think its 2008 though..i will work on getting it shorter..thanks guysMartin, I made the header insert on the final production version pipes a little longer so they would telescope over some folks precut header pipes. Some header pipes are out of round, and don't telescope well. You are able to telescope the pipe over the header pipe, correct? As long as you have a little (~1/8") of the cylindrical section on the ID of the pipe you'll be fine. The cylindrical section is 17/32" long on the CNC inserts, so cutting ~.4" from the header end should be no issue; there is stuill about 0.6" of the insert in the square transition, so it won't come loose. I have one 180* header pipe that is actually cut about 1/8" into the bend. It still telescopes ~1/8" into the pipe, but I also water cool my header pipes to help the couple life (and preheat the head cap water
Marty, Are you running the 2008 CMB liner (19.5mm OD) in your MAC?
I can say that 7 3/8" is too short on my MAC21 Seaducer. It would't get on the pipe at all. It was my second prototype pipe that I had reworked from a NR to MAC style and left the header end too short. I have since reworked it and will try it at 8.25" in a couple Saturdays.
Jon:Martin, I made the header insert on the final production version pipes a little longer so they would telescope over some folks precut header pipes. Some header pipes are out of round, and don't telescope well. You are able to telescope the pipe over the header pipe, correct? As long as you have a little (~1/8") of the cylindrical section on the ID of the pipe you'll be fine. The cylindrical section is 17/32" long on the CNC inserts, so cutting ~.4" from the header end should be no issue; there is stuill about 0.6" of the insert in the square transition, so it won't come loose. I have one 180* header pipe that is actually cut about 1/8" into the bend. It still telescopes ~1/8" into the pipe, but I also water cool my header pipes to help the couple life (and preheat the head cap water
Marty, Are you running the 2008 CMB liner (19.5mm OD) in your MAC?
I can say that 7 3/8" is too short on my MAC21 Seaducer. It would't get on the pipe at all. It was my second prototype pipe that I had reworked from a NR to MAC style and left the header end too short. I have since reworked it and will try it at 8.25" in a couple Saturdays.
