To all the people posting Rob Dahm comments. This is exactly what he wanted. For more shops to build more rotaries and stop acting like there's some secret to building them. To be fair on his defense, he's doing what entire shops do with just 3 or 4 people and he's not a professional. He's just a smart guy with a dream.
Well said my friend it don't matter who us building them just as long as there getting built and people are having fun that's all its all for fun to learning new shit
I mean, these shops have existed before Rob came into the scene, NZ has a shitload of very strong rotary shops that have been around for decades, it's just most mainstream car people don't know about it because NZ is a tiny country with fuckall recognition despite our insanely big car scene.
This sounds nothing like any other engine. It's not the thunderous roar of a V8, not the V10 symphony, the beautiful scream of a V12 or a 4-rotor. This is just pure aggression. I love it.
Its definitely unique...at idle is sounds like a mix of a V8 rumble, with some of the V10 symphony without having the exact sound....and at high rpm it has a mix of a lower V8 sounding rumble mixed with a V12 scream.
@@White1sox PPRE also have built another 6 rotor a few years ago for a guy in China who put it in his RX7, he paid for the whole team to fly there and do it.
I cant say I'm all do or die for the rotor world, I grew up with v8s and that's just what I've always been around, but I can say that's amazing, it sounds amazing, I cant wait to see it make a pass.. who knows I might have to learn some stuff so I will have enough knowledge to start messing with these rotors.. I've built tons of v8s tons of 4cyl motors even inline 6s. First time I saw a rebuild kit for a rotor motor I was confused,$1000 and it was just a small box of washers and O rings lol.. so who knows might be time to learn something new.. but major props to these guys for building such a insane engine
@@chewylewy1714 Love Rob Dahm. First saw him when he took the 2 rotor Corvette to LS Fest. It was awesome seeing him gut his RX7 and start from the ground up preparing the car for AWD and a 4 rotor.
Technically Mazda pulled a sneaky with their capacity measurements so it's closer to 7,848cc given a rotar can fire once per crank rotation while a piston engine requires 2 rotations for the full 4 stroke cycle, which is why rotaries seem to make a lot of power for their quoted size. Also, PPRE's 6 rotor is designed to essentially be two 3 rotors rotated 180° from each other, so for a piston engine comparison you'd have to look at something like a 7.8L V12 which kind of puts the insanity of this engine in such a tiny car into perspective
Due to how the Wankel rotary's combustion cycle works, the real effective displacement is double the "rated displacement". I'll refer you to a good, short technical post explaining why this is true (go here: grassrootsmotorsports.com/forum/off-topic-discussion/dispelling-the-rotary-displacement-myth/43487/page1/ ), and also give you a simple formula for the true working displacement of a Wankel rotary. In short, because the rotors spin at 1/3rd the speed of the eccentric shaft, and because of how the rotors are offset, it gives 720 degrees (2 spins) for 2 combustion cycles to create 1080 degrees (3 spins) of the complete 4-stroke cycle for the eccentric shaft/crankshaft. The formula is: 654cc(chamber volume) * 3(amount of chambers) * (number of rotors) * (2/3) but an easy rule to remember is just double the advertising number.
@Automobile Addict it shouldn't upset anyone, rotaries are a very clever design and do have some benefits over piston engines, especially when it comes to the amount of air they can flow, the more direct conversion to rotating power and the reduced mechanical drag. But comparing power figures to piston engines has to be done with the right displacement comparisons (Craig has commented a much more accurate formula). It's very exciting to see a "1.3L" engine making over 200hp, but it's not actually THAT amazing when the effective displacement is more like 2.6L. Knowing that rotaries actually have much greater displacements than are advertised does explain why a 4 rotor engine (supposedly 2.6L) with a big turbo can throw out well over 1000hp, because it's actually closer to 5.2L in displacement and because rotaries flow so much air they can support very largo turbos. It also explains why fuel consumption is so poor, because a 13b definitely doesn't use gas like a 1.3! Obviously the weak point has always been the seals, but that comes down to the fact they weren't allowed to burn pre mix fuel or oil from factory for emissions legislation
@@petershergold9952 im the only one agreeing with you haha. Its all smoke and mirrors over here. Of course i wouldnt be able to do a 6 rotor if PPRE hadnt done it first. They set the foundation for me to try to improve upon
There several ways you can phase them you can do 2,3 rotors you can do 3,2 rotors you set it as a 2 and 4 rotor or a full 6 rotor just depends on how deep you wanna go and how much power and torque you want
And now a question from a guy who s no clue about rotary engines... I saw the 6 coils in a row. Couldnt they just put individual coils above each spark plug like nowadays? Wouldnt that help for more power???
Wtf are you talking about? I replayed the video like 40 times and theres nothing flying around in that shop bay, you probably just mistook some of the dust and debris floating around
Maybe because watching two blokes put dam water in a radiator and no dyno report at the end is a bit dull. Not to take away from their skills but not very entertaining unlike robs vids . That’s why he has attention 😊
