Max stable rpm

[Dude]

RENNTECH // WANKEL ROTARY // KART RACING ENGINES

Of course i do have mazda speed tattooed on my neck so my buddy would not let me pass up the chance to work on it and drive it.
http://www.karting1.co.uk/wankel-kart-test.htm

 

[Dude]

I dont know what chassis it was in. Wicked fast though.

 

[myusername]

my god. 48hp and 34ft. lbs in an engine that weighs 32 lbs. that thing has to be scary fast. how did it run when you rode it?

 

[Dude]

Like a rotary should high reving apex seal spinning fire breathing monster till 10-11 grand. Honestly i dont think i took it out of 4th or 5th gear as i was already going 90+

 

[myusername]

with that power curve it looks like it would pull fairly steady all the way through the rpm range. i've never driven a rotary. i've always been a fan of the late 80's turbo rx7, and i actually almost bought one for my first car but my mom wouldnt let me. i've studied a little back about three years ago on how they work for my engines class in high school. its always been appealing to me how they can make so much power out of such a small engine. werent the turbo 13b's rated at like 210hp or something like that?

 

[Dude]

Thing about a rotary is the power is very linear and so smooth you are just putting around in a 7 at 3 grand you give it a little gas and next thing you know your at 9 grand love it.

Back on topic though. Why are so many builders scared to answer my questions? Beginning to think its from a lack of knowledge on the subject matter at hand. Which is fine i just thought i would ask here first.

 

[Dude]

180rwhp dont buy one unless you can afford to fix it. Premix your gas *cough* *cough* no sh*t the factory oil injectors sh*t out worse than blasters. But you need to be very handy around them. I can link you to about 20 build threads of mine over at rx7club.com and nopistons if yah like.

 

[Dude]

Removed to stay on task of thread. Can post videos in another thread

 

[phragle]

I wonder what a whipple quad rotor would do to it,,,, heheheehe

 

[Dude]

lol the quad rotor peripheral ports i build are 400+ in N/A trim Of course they idle at 5 grand and rev out to 12 grand Braap Braap Braap Braap But there junk casue they go in circles instead of a masturbating like a piston lol.
f

 

[Blasterdude27]

i've never driven a rotary.

Your missing out..... LOTS of fun B)

 

[OConnor Racing]

I'll post later. Going to work.

 

[OConnor Racing]

“What is the maximum, stable RPM of a Blaster crank before it goes supersonic”? I don’t know but I’m sure piston speed would be the limiting factor. I don’t do drag engines for Blasters so I’m not running power curves in the type of RPM’s you’re looking at. As a matter of fact, I’m not even close to those numbers. Most of what I do with Blasters is trail and motocross stuff. If you take a global view of the entire engine, I would say 10,000 RPM is probably achievable with tons of work and 11,000 is going to start breaking things really fast. Engine cooling is going to be a major issue winding it up that high. They make a water cooled head for the Blaster but I don’t think it’s enough. We’ve looked at running tubing around the cylinder and making water cooled heads but all we’ve done is talk about it. We may try it when and if things slow down. Sorry it took so long to respond. I don’t remember reading it yesterday but I did read the thread this morning. You said you were sending me a head. Is this part of your Dyno shoot out? Are you only testing heads?

 

[Dude]

Yes i am sending you one waiting to pick up a spare. It will be tested for reference for others to see exactly what happens when you put a re cut re angled head on a relatively stock blaster. Numbers wrote down. New reeds run again etc.

 

[Dude]

If yah wanna donate let me know i have dyno not 10 feet from where i am now

 

[OConnor Racing]

Dyno numbers are great for some applications. I get all the free dyno time I need. I base everything I do on what the rider wants and how my changes make the engine feel. Not what a computer tells me are big numbers. Let’s face it. I could send Bubba to the nationals on a 75 HP 250 and all he would be is pissed off and in last place because he can’t stop it or turn it. On the bright side he would have plenty of time to brag about his huge HP numbers on the way to the hospital or when he’s sitting by the camper waiting for his engine to be rebuilt again. You can save yourself some time and loot and just cut the head yourself. If you’re that close to a dyno, I’m sure you have a lathe and know how to use it. PM me the bore size and I’ll send you the specs for the head.

 

[Dude]

Understandable. I am more into what combo works best for trail riding as well. So i want to mix and match what gives more trq what gives more peak hp and when etc etc.