700HP Rotary
02-12-2003, 09:27 PM
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02-14-2003, 12:52 AM
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this engine makes 700hp??? that's amazing, considering the R26B (c. 1991: 787B) was a 2.6L 4 rotor with the variable length induction system, and i believe made "only" about 700hp as well... hmmmmmm...
02-14-2003, 01:16 AM
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Above 3 rotor it's a modified 20B peripheral engine, which will likely make around 400-500Hp, but not 700Hp (only R26B can come close to that figure). And, if you notice peripheral ports are for racing only (the engine shown will likely idle over +1500rpm).
Those peripheral housings looks like modified 20B/13B similar to the Racing Beat that they sell. They use hose clamps to hold the intake manifold.
The Mazda Motorsports Factory team 3-rotor 13G cast housings are straight on both sides & I remember the 13G using 3 sparkplugs per housing (motorcycle type). Only factory team used them in the IMSA, etc... Roger Mandeville, Jim Downing, etc... Also, I've been lucky to see the R26B's & I can tell you it's a true rotary monster.
Mazda also sold some Mazda Comp peripheral cast housings that were 2 sparkplugs config. that was available for private racers.
The reason for the two rotors that are closer than the 1st one, it's due to heavy harmonic/flywheel balancing, & engine rotor configuration it's 120 degree between rotors. Also, the rear rotor housing plate take more stress in the back & wears more than the front ones. Also, it's interesting to know that the eccentric shaft of any three rotor, it a 2 piece unit. and the four rotor it's a 3 piece unit.
Those peripheral housings looks like modified 20B/13B similar to the Racing Beat that they sell. They use hose clamps to hold the intake manifold.
The Mazda Motorsports Factory team 3-rotor 13G cast housings are straight on both sides & I remember the 13G using 3 sparkplugs per housing (motorcycle type). Only factory team used them in the IMSA, etc... Roger Mandeville, Jim Downing, etc... Also, I've been lucky to see the R26B's & I can tell you it's a true rotary monster.
Mazda also sold some Mazda Comp peripheral cast housings that were 2 sparkplugs config. that was available for private racers.
The reason for the two rotors that are closer than the 1st one, it's due to heavy harmonic/flywheel balancing, & engine rotor configuration it's 120 degree between rotors. Also, the rear rotor housing plate take more stress in the back & wears more than the front ones. Also, it's interesting to know that the eccentric shaft of any three rotor, it a 2 piece unit. and the four rotor it's a 3 piece unit.
Last edited by amgtortoise; 02-14-2003 at 01:48 AM.
02-16-2003, 04:54 AM
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The reason for the different spacing is that each rotor has a primary and secondary intake port, with the secondary being larger. One intermediate housing has two small primaries and the other one has a small primary and big secondary. The plate with the primary+secondary is wider than the plate with two primaries. You can see the ports clearly in that picture.
Of course, that engine isn't using the side intake ports anyway, but it would be hard to source an eccentric shaft that you could use with two of the thin intermediate housings, and I am not sure the coolant passages and what not would line up anyway. Easier just to use the stock 20B eccentric and intermediate housings.
-Max
Of course, that engine isn't using the side intake ports anyway, but it would be hard to source an eccentric shaft that you could use with two of the thin intermediate housings, and I am not sure the coolant passages and what not would line up anyway. Easier just to use the stock 20B eccentric and intermediate housings.
-Max
02-16-2003, 06:30 PM
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uhhhhh....hello?
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Last edited by P00Man; 04-16-2011 at 04:39 PM.
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