so the top fuelers are running around 3 thousand hp..with big cube V8's... when or if do you think the rotary will be up to the task..... do we think its even possible. anyone....

mainly directed towards a 26B, I figured the any smaller, not a chance...

 

no
i just dont think it can..
maybe 4 rotor huge port, huge turbo, 20 extra dowels, LOTS OF BOOST..

i couldnt even image the fuel needs of this engine or a pump that could flow enough..

what do 747's use?

 

4 rotor, P-ported, 2 - T100+ turbos, 14000 rpm, 40 psi and 150 shot for spool should do the trick.

If only it were cheap to have a custom eshaft made. You would be able to make a motor to the size of your likings. 5 or 6 rotor anyone?

 

actually top fuel dragsters develop over 7,000hp

 

7000 since when.. ok so when is one of our own filthy rich rotorhead going to do it.... make crazy horse like that and ok if it takes a 6 rotor. lets push this envelope....

 

I thought there was a 6 rotor n/a that made arounf 900 in a plane

 

Actually they are upwards of 8000hp they can't dyno those numbers but that is what I have heard. I follow NHRA Top Fuel/Funny Car I'm a huge fan of the Funny Cars it takes a real driver to get those down the track. Oh they were making over 2000hp in the 1960's-70's we are well behind them. And the thing is they are getting faster and faster and that's with NHRA putting restictions on them they keep dropping the amount of nitromethane they can run and are made to run rpm limiters this year but the times are still quick. The fastest run is 4.44et and the mph is like 335mph tire technology is getting better can't wait to see who breaks into the 4.3xx's hopefully sometime this year maybe in Pomona when I go for the finals.

 

bahahaha

 

still, do ya think the rotary is capable of power like that.... 8000hp. so what if we go to 120mm rotors and use 6. were are the deep pockets we need.. someone has a couple million, wtf

 

Sure, why wouldn't it be possible? Curtiss-Wright and John Deere had some really big displacement rotaries... build a big enough one and what the hell.

As for one based off of Mazda parts, with 4-rotors or less, still maybe. Around 1HP per cc has been demonstrated to be possible on various engines with either nitromethane or exotic gasoline-ish fuels and big turbos. So, given the classic equivalency of rotaries being about the same as a boinger twice their displacement, 3-4k horsepower should be doable on a 3-rotor and certainly on a 4.

Anyone have the money to spend to bankroll an attempt to figure out if that's the case? Anyone have a place to race such a thing? Until the answer's yes to both of those, we're not going to know; noone's going to build it because there's nothing to use it for.

 

Something else to keep in mind here guys.

A top fuel car, with a whipple (screw style) supercharger would make ~2000 more HP then they make with the current roots style superchargers. Likely more then that with tuning and lighter regulations, or if the amount of nitro % was allowed to be brought back up.

As much as it is a cliche, there really is no replacement for displacement in a maximum effort engine.

My family races top fuel drag bikes, and I've grown up talking nitro and hanging out with family friends that race nitro cars (Funny and Top Fuel), so I believe I have a unique perspective on this stuff-

 

rotary on nitromethane.... anyone doing it yet?

 

Where's the extra 2000 horsepower come from switching to a screw-type blower? As I understand it, the power loss number tossed around for the Roots type blowers has always been on the order of 3-500 horse; a screw type would have less draw, a cooler intake charge, and the potential for more boost, but aren't the current cars forcing enough air in that the proper AFRs are approaching hydrolock on the cylinders? Upping the nitro percerentages though, I could see having a good sized gain.

And sure, there's no replacement for displacement in a max effort racing engine... but name a max effort class (auto racing anyway) without displacement limits. Or, as is often the case, restrictors. Or weight breaks based on displacement. Seldom a bad thing to make the most out of what displacement you have.

Like I said before, I'd be surprised if anyone's seriously playing with nitromethane in rotaries. No place to race it, thus no way to get sponsorship money, thus no money to build it, and no reason to build it. And nitro's unsuited to anything but drag racing, for obvious reasons.

 

The whipple style superchargers are more efficient than the roots style superchargers and they do run cooler than the current setup they run in top fuel. The whipple style surperchargers are outlawed in top fuel competition. I don't know if it would get an extra 2000hp but would defineately be more than what they are currently making. Hell think about it these motors are limited to 500 cubes imagine what they could do with larger displacements. Rotarys are my passion but I love those top fuelers and funny cars. My favorite place is being at the end of the track when they are passing you at over 300mph. Nothing compares only being in one would be even better. Digitalsolo man I give it up to your family running those top fuel drag bikes those things are a handful to ride. What's scarier is when you see those things blow kind of nerve racking when you have your stomach attached to a time bomb.

 

yea they cant dyno dragsters with that much power... could you imagine even trying to hold it down... those hp figures are all calc somehow from speed et and mph. unless maybe they use engine dynos.. who knows.

 

"No place to race it, thus no way to get sponsorship money, thus no money to build it, and no reason to build it. And nitro's unsuited to anything but drag racing, for obvious reasons."

This is when the pure rotary freaks, need to shine. where: some ******* road
why: because no on else is doing it... I guess I found new direction...

 

This guy has a 1000hp on methanol, not anywhere close, but it's a start.

www.blown3rotor.com

 

13btnos: Oh yeah, I know the screw types are more efficient, and I know they're outlawed but... I dunno that I can see *that* much of a difference. Who knows, though?

turboR1: Well, there's ways of dynoing things with that kind of power output... yeah, engine dynos... but the problem is getting the engine to last at full power for long enough to get useful data.

astrochild7: Hey, if you've got the money to throw at a project of this magnitude, that you can't drive anywhere, solely becuase it's not been done... well, more power to you. Personally though, when I start kicking around more ambitious projects, I prefer for them to have some sort of use other than converting money into noise and broken parts.

 

[QUOTE=Kenku]13btnos: Oh yeah, I know the screw types are more efficient, and I know they're outlawed but... I dunno that I can see *that* much of a difference. Who knows, though?

From my previous post "I don't know if it would get an extra 2000hp but would defineately be more than what they are currently making." I'm in agreence with you on that. But I sure would like to see one on a top fueler. They are having trouble getting down the track as is so when tire technology and transmission technology get better, watch out see what those top fuelers will be running. It would be great to see a 3 second pass. I hope they do it before I'm dead in the grave.

 

Ah, yeah, okay... I misunderstood.

IIRC, isn't everything essentially required to be mechanical / pneumatic or whatnot? Gotta think of what an F-1 style launch control (modified to work on drag slicks) could do, for example. Or turbos, or any number of other things.

'course, I also have to wonder what a Porsche 917/30 with a LeMans type aerodynamics package would have done down the Mulsanne...

 

how do you go about tuning an 8000 hp engine--without a dyno?
those guys gotta have skills!

 

They read the sparkplugs. No seriously if you went to an event and checked these race cars out you wouldn't believe the technology they have. You should see the the data acquisition computers and monitors they use. Hell they even have dopler radar to make adjustments for the weather.

 

yea, but the initial tune... my hat's off to them.

 

5 & 6 rotor? I don't think so! The multi piece e-shaft would be the weak link. If the top fuel dragsters had multi piece crankshafts, I don't believe they would last very long. I larger displacement rotary (like the experimental 21a or something much larger) with either a one piece or maybe a two piece e-shaft should get that hp figure.

 

You guys know that the Top Fuel guys are slipping the clutch ALL the way down the track, right? HP isn't an issue...it's traction! They could EASILY burn out ALL the way down the 1/4 mile!