Or this car is barely spooliing this turbo.....guess someones math is off...or just went big for talks sake...
Huge Turbo....No Spool
Is it me...Vid
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bmwfan2304
- Posts: 305
- Joined: Feb 12, 2006 12:00 PM
also... don't rotary engines have an extremetly high redline? in fact i thought they didn't have one but were limited by the ability to pump gas and such... Anyway, even though he's holding the gas down for a couple seconds it may still be really low in it's rev range... don't know if i'm right but it makes sense to me... 
they do have their limitations, but they are much higher in the 12K+ range over our wonderful valved engines. My friend charles had a TurboII 2rotor that he took me for a ride in and he always rode that babyy in the 10K+ range making the engine screwm, but also the rear end swing out of control sometimes.
he ended up totaling the car when he flipped it i think some 8x in 2nd gear after flying into a ditch. silly kids need to learn control before they get into some of these cars. he said the car was at 14.5K rpm when he threw it out of 2nd and lost control.
3 rotors are beautiful engines.
he ended up totaling the car when he flipped it i think some 8x in 2nd gear after flying into a ditch. silly kids need to learn control before they get into some of these cars. he said the car was at 14.5K rpm when he threw it out of 2nd and lost control.
3 rotors are beautiful engines.
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bmwfan2304
- Posts: 305
- Joined: Feb 12, 2006 12:00 PM
[QUOTE="kendogg"]if that thing is a rotary, why does it look like an inline 6? Count the tubes comming out of the intake manifold.[/QUOTE]
Rotarys have 2 intake ports per rotor and each port gets its own intake runner. Since its a 3 rotor, it has six intake runners. Rotarys also spool much larger turbos than a piston engine of similar size for a few reasons. The main difference is the amount of combustion events per 1 revolution of the eccentric shaft. There are 3 combustion pulses from just ONE rotor in one e-shaft revolution. Now consider two, three or even four rotors. This higher density of exhaust gas per rev helps to spool the turbo much better. There is physically more exhaust exiting in the same amount of time. This is also the reason for the high power output from such small displacement.
The other factor is spoolup is how the exhooassed port gets "opened". Instead of a valve in a piston engine gradually opening over a few degrees of crankshaft rotation, the rotary uncovers its exhaust port almost intantly and the exhooassed gas rapidly spills out the port with a much higher velocity(kinetic energy) and also helps spool.
My brother is a huge rotary nut and has an '87 TurboII with a fresh engine that we built which is why I know more than I should about these strange beasts. Its a fun, fast car but it definitely has its quirks.
Rotarys have 2 intake ports per rotor and each port gets its own intake runner. Since its a 3 rotor, it has six intake runners. Rotarys also spool much larger turbos than a piston engine of similar size for a few reasons. The main difference is the amount of combustion events per 1 revolution of the eccentric shaft. There are 3 combustion pulses from just ONE rotor in one e-shaft revolution. Now consider two, three or even four rotors. This higher density of exhaust gas per rev helps to spool the turbo much better. There is physically more exhaust exiting in the same amount of time. This is also the reason for the high power output from such small displacement.
The other factor is spoolup is how the exhooassed port gets "opened". Instead of a valve in a piston engine gradually opening over a few degrees of crankshaft rotation, the rotary uncovers its exhaust port almost intantly and the exhooassed gas rapidly spills out the port with a much higher velocity(kinetic energy) and also helps spool.
My brother is a huge rotary nut and has an '87 TurboII with a fresh engine that we built which is why I know more than I should about these strange beasts. Its a fun, fast car but it definitely has its quirks.