jjones752 (Offline)
#11
1/8/14 12:18 PM
Originally Posted by DAD:
Jim
Yep that chain is expensive.
The efficiency of a Hypoid gear with a very low mounted pinion aka rear end is down around 90 to 95% multiply that by the 95 to 98% efficiency for the quick change gears and you get something like a 20% loss of efficiency. Them rear ends get hot and that heat (friction) is due to sliding of the teeth in the Hypoid type gears. This eats up horse power. That is why they make special oils for Hypoid gears because regular oils just aren't strong enough to work with them.
Problem:: if you placed the motor fore and aft in the center of the chassis the drive shaft is already offset to the right several inches. Place it 6" offset to the left and the drive shaft is probably going to be inline with the brake pedal. Then you got to figure out how to raise the drive line or drop the engine enough to get the drive shaft in-line. TQ's fix this problem by chopping off the transmission. That worked OK with the low rpm of the 750 Honda but to try to gear for 13,000 RPM's + with an 82" tire with only the rear end gears is not possible right now. Boy that is going to be a strange looking quick change.
I could see probably a jack shaft with timing belt being used for both motor placement and gear ratio. When somebody finally does this I'm going to put two of these things in a race car and go race full midgets Ala dual engine go Karts. They weren't a whole lot faster but boy did they give you a kick in the butt when you got down on them.
Wonder if they would allow Dual Right Rears?
Honest Dad himself
So M/E = Mechanical Efficiency: got it.
I haven't measured crank to countershaft c/l on my oiler, but just eyeballing a Kenyon Car they look to be a tad over 6".
There are some high-winding Suzuki 4-cammers out there in TQ land, so they must have figured the gearing out.
Your jackshaft/timing belt setup would add quite a bit of bulk and probably suck even more power, not to mention the additional bulk and weight of 2 gearboxes; the first Synergy V-8 the Kiwis built had two cranks and a central drive in a common crankcase, a similar idea but eliminating the gearboxes, kinda like the BRM H-16 F1 motors from around 1967 (2 stacked boxer-8's with a central power take-off). They scrapped that for a single crank, due to guess what? Excess weight, and power drag. Hey, didn't Mel & Don already do that about 20 years ago?
Jim Jones
Midwest Thunder Speed2 Midget #97