Re: What's with that engine????

Discussion in '1998 Mazda Pettit Racing RX-7 Banzai' started by Gumball 3000, Aug 10, 2002.

  1. What's with that engine????

    Everybody has his own opinion about things.
    I would never drive a rotationengine!!!
    Maybe it's a nice invention, but it can never tops a conventional engine. Let me hear your opinions!?

    Greetings from the Dutch guy <IMG SRC="http://www.supercars.net/servlets/cMsg/html/emoticons/smile.gif">
     
  2. I think the rotary engine is a great design. Each stage(intake, compression, ignition, and exaust) is continously going; whereas in a pistion engine...each pistion can only do one stage at a time. Plus this engine can rev extremely high and is very well balanced. Like you said though, everyone has their own opnion. I like both rotary and pistion engines.<!-- Signature -->
     
  3. The only negative thing I can say about rotary engines and Rx7s inparticular, is there serious lack of relability.
     
  4. rotary engines are great i agree with the fact mentioned before that a single rotor has more power strokes per cycle than a sing piston. the only problem is that the apex seals on the rotors can only handle so much pressure thus making them harder to tune because they can only handle a sertain amount of turbo boost or pressure within the combustion chamber. other than that rotary engines weigh a lot less and i mean A LOT. they have no camshafts or any other complicated valve mechanisms which saves weight and cuts down on the recipocating mass which in turn alows them to reach extremely high rps [when compared to normal piston engines] and they allow the car to more easily achieve the perfect 50/50 weight distribution.<!-- Signature -->
     
  5. ok first of all felix wankle was a genious. This wasn't the only rotary that has been invented. there are some out there that keep a continous 24000 rpm. The rotary is the most efficient why of generating power next to a nuclear reactor. they are 3 times as light as a piston engine...will sustain high rpm much longer without misfire...have no rings to fry...rotors don't have to stop and change direction every stroke...put out more horsepower per litre than a jet engine...and finally you can pull a 12 to 1 compression ratio easily without having any trouble blowing off heads. not to mention they don't need lifters, valves, cams, or mechanical timing. let me know when a piston engine achives that and then we can talk...till then I know where my heart is...

    the rx7 junkie
     
  6. <!-- QUOTE --><center><hr width="90%"></center><blockquote><i>Quote from grahambo</i>
    <b>ok first of all felix wankle was a genious. This wasn't the only rotary that has been invented. there are some out there that keep a continous 24000 rpm. The rotary is the most efficient why of generating power next to a nuclear reactor. they are 3 times as light as a piston engine...will sustain high rpm much longer without misfire...have no rings to fry...rotors don't have to stop and change direction every stroke...put out more horsepower per litre than a jet engine...and finally you can pull a 12 to 1 compression ratio easily without having any trouble blowing off heads. not to mention they don't need lifters, valves, cams, or mechanical timing. let me know when a piston engine achives that and then we can talk...till then I know where my heart is...

    the rx7 junkie</b></blockquote><center><hr width="90%"></center><!-- END QUOTE -->

    most efficient way next to a nuclear reactor is a HUGE statement - and an incredibly incorrect one too

    rotary's are less efficient than piston engines - fuel wise. they consume a lot of gas - lower thermal efficiency than normal piston engines.

    gas turbines are the most efficient ways to make power from the combustion of gases.

    rotary's run about 8-9:1 compression - much lower and it's much harder to adjust their compression - i believe you'd have to use a completely differnet rotary/housing setup to change the compression.

    more hp/liter than a jet engine??? hahahaha exactly HOW would you measure displacement with a jet engine??? like i said before, any form of gas-turbine engine which includes jet engines is going to be far more efficient and far more powerful than any internal combustion engine. their only fault is that they are very picky about what rpm range they want to operate to be most efficient and powerful - therefore they don't have the flexiblity of internal combustion engines. the M1A1 abrams tank uses a 1500hp gas turbine that weighs only several hundred pounds. and that thing's powering a 70 ton tank.

    the type of rotary which can spin at 24,000 RPM is different than the rotary's that are generally used. those have spark plugs in the rotor itself and is an impractical design - you'd have to tear apart the motor everytime you needed to change spark plugs.

    rotary engines are good but not god's gift to the automotive world - do a little research instead of pulling "facts" out of your ass next time.
     
  7. to that Phat keed,they are only unreliable, if ur a jackass that doesnt know what he doing<!-- Signature -->
     
  8. Will someone tell me what a rotary engine is and how it works, I'm just getting into cars.
     
  9. #9 car-god, Aug 10, 2002
    Last edited by a moderator: Apr 25, 2016
    this is for the guy who wanted to know how rotaries work. you should go to www.howstuffworks.com and search for rotary. they'll show you everything with full animations.<!-- Signature -->
     
  10. Lack of reliability? My RX-7 has hit 151000 miles and it runs great!
     
  11. The rotary engine is a great invention but if it brakes down you have to order the parts from japan for an arm and a leg<!-- Signature -->
     
  12. Rx-7s are great cars but the only problem is that the rotary engine is known for breaking down and the rx-7 is known for back firing in high rpms. I think people should buy rx-7s but they must have enough money to replace any parts that you will have to order from Japan.
    <!-- Signature -->
     
  13. well if you dont maintain your rotary engine of course its going to break down. try getting carbon apex seals, you can change the comp.ratio by getting a performance rotor installed to replace the factory item. sure they can use heaps of gas but thats mainly because at one point in the rotors cycle the inlet and exhaust ports are exposed at the same time, so unburned fuel escapes to the exhaust hence the backfires. Man all you rotary fans should come live in new zealand, pleanty of parts and cars and at way lower prices than what u guys pay. I was also wondering if anyone in america has heard of porting a rotary engine before?
     
  14. #14 NismoMasta, Aug 10, 2002
    Last edited by a moderator: Apr 25, 2016
    The coolest thing is to tune a rotary, all you need to do is make larger ports. No messing with camshafts and other mechanical crap. Drill some bigger holes, tuned intake and exhaust and you have as much power as you desire.

    I've heard of a 4 rotor in a RX7 doing 12,000rpm and making 889hp on **98 OCTANE STREET GAS** I believes it holds alot of the records for a non-turbo street legal car.

    The poor fuel economy and reliablity (more driver fault than anything) is only a question of engineering. Mazda made cheap rotarys with common materials. Look at what Moller industries is doing with Freedom Motors making wankel rotarys, they have rotarys that make Hp/litre/weight to rival a dragster, and make about 4% of the emissions of a standard engine.

    We're going to have zero emission flying cars soon because of it.
    www.moller.com
    <!-- Signature -->
     
  15. Exactly guys, rotary engines are just like any other, if you run the hell out of it and dont take care of it, its gonna break, its as simple as that. You need to know what your doing with any engine; period
     
  16. Exactly guys, rotary engines are just like any other, if you run the hell out of it and dont take care of it, its gonna break, its as simple as that. You need to know what your doing with any engine; period
     
  17. i like both the conventional engine and the rotary, but i guess you gotta love it or hate it.
    like i love straight 6s but some people just wont settle for less than say a v8 so at the end of it its to each his own.
     
  18. goods thing bout the rotaries is they can rev upto twice as much as a piston engine if worked u can get insane HP out of them and there just mad
     
  19. Unreliable...you should own one before you say that. Not to mention ANY engine can be terribly unreliable if you don't know what the hell you're doing! 8.9:1 compression ratio??? You might wanna check that again since the average compression ratio is 9.4:1 (and that includes some turbos the 3rd gen is at 9.1:1 if I'm not mistaken). They might not have the best gas mileage, but it's a sports car...who gives a shit? Would you buy a Ferrari because it gets great gas mileage??? Not to mention if you know how to work on one (which obviously I've been doing for quite sometime now) you can change the mileage to something more "favorable". Do more research on something before you condemn it...
     
  20. Great post!!!!!!
    Like it's said before, if you run anything into the ground, it's gonna break down and need repairs.
    side note: Does anyone know someone who is selling a 3rd generation rx-7? i'm looking at the prices/possibilities. thanks alot!!
     
  21. Too bad there are that many rotarys around these days
     
  22. only downside to the rotary is that it tends 2 overheat more quickly than conventional engines and needs more maintenance than most.
    on the other hand, nothing can top a good rotary
     
  23. Meh, if you love your rotary treat it to a larger intercooler and radiator and you won't regret it.
     
  24. rotary engines only have 3 moving parts, so you'd think they're way more reliable....
     
  25. Anyone who is an expert in the new RENESIS engine?
    It can get almost TWICE the distance with the same amount of gas compared to the 13B of RX-7.

    For example, 3rd Gen RX-7 goes 6.1km with a litre, when RX-8 goes 10 km.
     

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