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RotaryProphet · 10-07-2009, 11:36 AM

I think you guys are overblowing how expensive it would be.

Let's take a quick rundown of the prices for a theoretical double 4 rotor engine: Most of this is way over generalized, and some of it I just made up, but it's still an educated guess. Some of the info came from this site: http://www.holy-cow.org/faq.html

First, the big parts. kiwi-re sells a 4 rotor kit for $9500 that includes:
1:- Eccentric Shaft
2:- Front counter weight
3:- Rear counter weight
4:- 2 x Centre plates
5:- 2 x Stationary gears (modified)
6:- 2 x Stationary gear carriers
7:- 2 x Stationary gear external oiling mods
8:- Rear main nut
9:- 2 x eccentric shaft end caps

Also, the coupling for the two motors, using the example of the tractor pull motors, would include a carrier to bolt to the rear motor's snout, that would accept the other end of a stub shaft what would slip into the clutch disk on the front motor. Although a simple design would leave the clutch locked all the time, but the possibility is there to disengage the clutch and effectively turn it off. Also, via their method, you'd want brackets to bolt the two engine blocks together to help keep them from twisting relative each other. I'm going to call this less than $3000, and could be done by most competent fabricators/machinists. We'll count it as $5000, just because someone will whine about the number no matter what I put down.

So, our quick price list:
Block/internal
2x $9500 - Quad rotor kit
$5000 - Engine coupling
8x $1048 - Peripheral port housings
2x $1615 - Aluminum front plate
2x $1425 - Aluminum rear plate
4x $2365 - Super lightweight 9.7:1 rotor pair
2x $3159 - Dry sump kit
8x $1299 - Single rotor ceramic apex seal kit (all springs & seals)
Total: $64,634

Intake/Exhaust
4x $250 - Peripheral port IDA intake
4x $965 - IDA Style EFI Throttle Body w/ Rails
$316 - A1000 Fuel Pump
$140 - A1000 EFI Bypass Regulator
16x $59 - 75lb/hr EFI Injector
$461 - Megasquirt ECU w/ Relay board, custom built
2x $199 - LC-1 Wideband controller/sensor combo
2x $1500 - Custom header & exhaust
Total: $9,658

Misc:
$500 - Twin oil cooler, thermostat, remote mount filter & AN Fittings & Lines
$400 - Fuel lines & AN Fittings
2x $280 Remote mount electric water pump
$500 - Custom heavy duty radiator
Total: $1960

Granted, there's a -lot- not on the list; you'll need to adapt the motor to a transmission capable of handling the ~800hp this beast could make, then you'll need the torque converter or clutch to reign it all in. You need other miscellaneous hardware, adapters, and hoses. You'll need to have the motors tuned. You'll need a large dry sump tank to supply both pumps and engines. You'll need coilpacks to provide spark, but you could use stock FC/FD coilpacks, and simply split the ECU signal, assuming the engines are phased identically, otherwise the ECU can be modified to provide individual signals.

My parts count comes to $76,252, and counting 25% extra for whatever else isn't included (I usually count more, but given the high price of certain individual specialized parts, I don't think that would be accurate), that's just a bit over $100k. Turbocharging could be accomplished assuming you can find a place to mount everything, and honestly it wouldn't be that much more expensive, in the grand scheme of things. Another $20-25k or so. That would include 2 very large turbochargers, lines & fittings, another fuel pump, and the water-air intercooler you'd almost have to use. Power output at that point is as close to unlimited as your chassis & drivetrain budget would allow. A performance built TH-400 can handle 800-900hp easily, but the 2000hp you could get out of 8 turbocharged p-port rotors without breaking a sweat? That's a whole different world.

10-07-2009, 11:36 AM	#37
RotaryProphet Rotary Fanatic Join Date: Sep 2008 Posts: 147 Rep Power: 17	I think you guys are overblowing how expensive it would be. Let's take a quick rundown of the prices for a theoretical double 4 rotor engine: Most of this is way over generalized, and some of it I just made up, but it's still an educated guess. Some of the info came from this site: http://www.holy-cow.org/faq.html First, the big parts. kiwi-re sells a 4 rotor kit for $9500 that includes: 1:- Eccentric Shaft 2:- Front counter weight 3:- Rear counter weight 4:- 2 x Centre plates 5:- 2 x Stationary gears (modified) 6:- 2 x Stationary gear carriers 7:- 2 x Stationary gear external oiling mods 8:- Rear main nut 9:- 2 x eccentric shaft end caps Also, the coupling for the two motors, using the example of the tractor pull motors, would include a carrier to bolt to the rear motor's snout, that would accept the other end of a stub shaft what would slip into the clutch disk on the front motor. Although a simple design would leave the clutch locked all the time, but the possibility is there to disengage the clutch and effectively turn it off. Also, via their method, you'd want brackets to bolt the two engine blocks together to help keep them from twisting relative each other. I'm going to call this less than $3000, and could be done by most competent fabricators/machinists. We'll count it as $5000, just because someone will whine about the number no matter what I put down. So, our quick price list: Block/internal 2x $9500 - Quad rotor kit $5000 - Engine coupling 8x $1048 - Peripheral port housings 2x $1615 - Aluminum front plate 2x $1425 - Aluminum rear plate 4x $2365 - Super lightweight 9.7:1 rotor pair 2x $3159 - Dry sump kit 8x $1299 - Single rotor ceramic apex seal kit (all springs & seals) Total: $64,634 Intake/Exhaust 4x $250 - Peripheral port IDA intake 4x $965 - IDA Style EFI Throttle Body w/ Rails $316 - A1000 Fuel Pump $140 - A1000 EFI Bypass Regulator 16x $59 - 75lb/hr EFI Injector $461 - Megasquirt ECU w/ Relay board, custom built 2x $199 - LC-1 Wideband controller/sensor combo 2x $1500 - Custom header & exhaust Total: $9,658 Misc: $500 - Twin oil cooler, thermostat, remote mount filter & AN Fittings & Lines $400 - Fuel lines & AN Fittings 2x $280 Remote mount electric water pump $500 - Custom heavy duty radiator Total: $1960 Granted, there's a -lot- not on the list; you'll need to adapt the motor to a transmission capable of handling the ~800hp this beast could make, then you'll need the torque converter or clutch to reign it all in. You need other miscellaneous hardware, adapters, and hoses. You'll need to have the motors tuned. You'll need a large dry sump tank to supply both pumps and engines. You'll need coilpacks to provide spark, but you could use stock FC/FD coilpacks, and simply split the ECU signal, assuming the engines are phased identically, otherwise the ECU can be modified to provide individual signals. My parts count comes to $76,252, and counting 25% extra for whatever else isn't included (I usually count more, but given the high price of certain individual specialized parts, I don't think that would be accurate), that's just a bit over $100k. Turbocharging could be accomplished assuming you can find a place to mount everything, and honestly it wouldn't be that much more expensive, in the grand scheme of things. Another $20-25k or so. That would include 2 very large turbochargers, lines & fittings, another fuel pump, and the water-air intercooler you'd almost have to use. Power output at that point is as close to unlimited as your chassis & drivetrain budget would allow. A performance built TH-400 can handle 800-900hp easily, but the 2000hp you could get out of 8 turbocharged p-port rotors without breaking a sweat? That's a whole different world.