Jim-
Thanks for responding to my questions. The sprockets are all made from 3" 8mm blower drive pieces, machined to about 1.250" wide, to take 30mm belts. The application is strange. I'm building a two-stage drive for a huge 14-71 blower at 19% of crank speed, utilizing a jackshaft. I don't know specific loads. The second belt needs to drive a billet 14-71 (normal helix, Teflon'd) making about 12-14 PSI (into a 91 c.l. engine) at a maximum speed of about 1,700 RPM. The first belt will be very lightly loaded- about one quarter of the load on the second belt, but up to 9,000 RPM of the 32 tooth crank sprocket.
Thanks, Jack Gifford
Jack, I hope you don't mind that I have posted your message to me here in the forum. I am doing that to make sure that my response will be available for others to see.
There are two 8mm blower belt profiles. The first is, indeed HTD and the second is a proprietary profile for the Gates PolyChain belt. It would help me to get my head around this if you could provide the part number for the 3" belt.
It sounds like the blower might be as big as the engine
. If you are saying that you are gearing the drive down to 19% of engine speed, that will have a huge impact on my thought process.
I want to mention the ugly thought of parasitic losses created by the huge rotors of a 14-71 blower. Even with teflon wipers, it will be significant.
I am running today, so will end this post, I will continue to be active in this thread.
Jim