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Location:
Melbourne - NthSubs
Registered:
January 2004
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13b? yes? no? maybe?
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Tue, 06 July 2004 15:31
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wats so good or bad about rotary engines?
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Location:
Ballarat, Vic.
Registered:
September 2002
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Re: 13b? yes? no? maybe?
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Tue, 06 July 2004 16:57
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Cheap power. Easy to obtain. They are high maintanace but if looked after will last a fair while.
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Location:
melbourne
Registered:
November 2003
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Location:
Brisbane
Registered:
May 2002
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Re: 13b? yes? no? maybe?
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Tue, 06 July 2004 23:32
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Good: lots of power for their size, huge amount of knowledge out there for squeezing the maximum amount of power out of them.
Bad: use lots of fuel for their size, very difficult to keep quiet (especially when ported). Oh yeah, and they're built by Mazda. 
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 01:02
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no
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Location:
Bayside Melbourne.
Registered:
May 2003
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 02:44
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yes
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Location:
Melbourne
Registered:
March 2003
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 02:48
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like all engines that make big power they suck through petrol like crazy. Considering their small size they can make amazing amounts of power, and making this power is quite cheap too. They react very well to mods ie exhaust and plenum. The engine is lightweight and small so it can pretty much be put into anything. They sound tough 
Maintanance is a hassle though, they inject oil and burn it to keep lubricated and should only use natural oil, never use synthetic on a rotary powered car.
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Location:
Brisbane
Registered:
July 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 03:31
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i reckon they sound gay, not tough
like a mower
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 04:54
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if they ever work out how to make REALLY GOOD apex seals then they would be great. The idea is good with less moving parts and all but the apex seals breaking because of the different angles stuffs that up.
if they are well maintained and stock they will last a fair while but if they are modded turbo or ported they will need fairly regular rebuilds. depends on amount of mods of course.
some people say 10 000kms out of peripheral port rotors! that is shit if you ask me.
non turbo ones don't make much torque but make good power becuase of revs when modded. Use heaps of fuel. the sound they make is a love/hate thing 
that is all i can think of
oh and mazda is owned by ford. do you want a ford?
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Location:
Brisbane
Registered:
May 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 06:56
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It's true that modified rotaries can have a short lifespan, but on the other hand they are very easy to rebuild (thanks to few moving parts) and thus cheap to rebuild.
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Location:
Gold Coast
Registered:
May 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 07:27
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GOOD: All the the above. 
BAD: To get good power out of a N/a rotary requires bugger all really, but does involve a very free flowing exhaust (induction, inlet & exhaust ports,primaries and mufflers) which is mucho noisy. Building a tough but reasonably quiet N/a rotary for the street is impossible. Muffle them = lose power.
That's why extend ports or 'street' ports are all that's worth having on the street (unless you like loud exhausts 24/7).
Build a bridge, J or peripheral port and muffle it makes it bugger all more powerful than a simple extend port (until you drop the exhaust and then watch it go like a cut cat)
The best rotary for the street is a turbo one as the turbo naturally muffles the exhaust without robbing power akin to a n/a motor. This is the only way to have a quick and reasonably quiet rotary powered car for the street.
Not a big issue but they also run VERY hot for such a small thing. I have found all the ones I ever modified always lasted very well provided you keep very regular oil changes up to them. I also used premixed fuel and dropped the direct oil injections thingo's as injecting dirty oil into an engine just didn't make any sense to me at all.
Oh yeah, thirsty suckers is no understatement.
I must be getting old as I used to love the sound of them, now I hate the racket and smell.
Hope that helps in some way........
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Location:
Sydney
Registered:
June 2004
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 08:33
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IF IT AINT A ROTOR!
IT AINT A MOTOR! 
SO THEY SAY
i love rotors for the power, noise, size and everything else... but yeah they need the rebuild constantly, munch munch on fuel HAAAAAAAAAARRRRRRRRRRD
so if you got money to throw then HELL YEAH!!!!!!!!!!!!!!!!
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Location:
Brisbane
Registered:
November 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 12:44
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People who, with limited forethought or constructive argument, bag a rotary engine because it's a rotary are misled. They are the same people who, if 10 years older, would swear that V8's were the only way and that "them turbos" and "that fuel injection stuff" were crap.
Don't listen to them.
Every engine (and car) has good and bad points. Rotaries suffer a little from reliability - mostly when maltreated - but that said I didn't buy one for that very reason and then spent twice my Toyota's purchase price in repairs. Go figure.
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Location:
Ballarat, Vic.
Registered:
September 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 16:36
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countless amounts of times my bro has said his v6 commo would be faster then my gze aw11. Bloody bogans!! He had trouble believing a mates GTi-R would beat a clubsport aswell.
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Location:
Adelaide
Registered:
June 2003
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 22:19
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id say rotaries are very reliable, but there not very durable.
they wont suffer abuse (no oil, boost spikes, detonation) but if you look after your car it will last well.
i own a rotary and the only stuff i have had to fix on it has been diff and gearbox mounts, and the clutch.
if your going to buy one do proper research, dont just listen to what everyone on toymods (or ausrotary) thinks.
the plus side of rotarys is the dont weight much, you can make ALOT of power for comparativly little $$$, and they love to be hammered all day every day.
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Location:
Newcastle
Registered:
May 2004
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 23:06
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u want a 20b, and u want it in an 86, there is a movie of one already with this engine putting out 600ps, enough said.
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Location:
Brisbane
Registered:
May 2002
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Re: 13b? yes? no? maybe?
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Wed, 07 July 2004 23:22
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Just make sure you use a JDM Sprinter diff behind a 20B.
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Location:
Melbourne - NthSubs
Registered:
January 2004
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Re: 13b? yes? no? maybe?
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Thu, 08 July 2004 04:57
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20b ey...... 12a?
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Location:
adelaide
Registered:
April 2003
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Re: 13b? yes? no? maybe?
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Thu, 08 July 2004 05:59
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the 'reliability' issues pretty much went out the door with the demise of twin dizzy motors, you will also find a lot of people with problems do not look after the motor to the correct service specs, ie they use synth oil, dont look after the cooling system, have no OMP etc
bad points are they are expensive to run and noisy. they use a lot of fuel and need constant maintenance, they are not really for the person who just wants to get in the car and drive.
good points are they rev very smoothly and you can get massive increases in power with only small changes to intake + exhaust.
you probably wouldnt want anything more than a large extend port on the street as you wont be able to drive a big bridgey (etc) at 60kmh in 4th gear... turbo is another option but might be overkill seeing as a very mild 12A with an IDA weber and exhaust will make much more power than any NA toyota 4 cyl with similar mods... plus theres the legality issue with turbo mazda motors in light toyotas!
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Location:
Adelaide
Registered:
June 2003
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Re: 13b? yes? no? maybe?
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Thu, 08 July 2004 09:03
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| pro_ke wrote on Thu, 08 July 2004 15:59 |
ie they use synth oil,
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semi-synthetic oil works fine!!!!
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Location:
Brisbane
Registered:
November 2002
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Re: 13b? yes? no? maybe?
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Thu, 08 July 2004 12:08
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The general consensus is that synthetic/semi synthetic oils are fine for rotaries, AS LONG AS you disable the metering and either run a 2-stroke additive or an external mineral oiling setup.
I'm sure people have run straight synthetics but I'd be sketchy myself.
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Location:
Adelaide
Registered:
June 2003
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Re: 13b? yes? no? maybe?
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Thu, 08 July 2004 14:50
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| 7M-Brisbane wrote on Thu, 08 July 2004 22:08 |
The general consensus is that synthetic/semi synthetic oils are fine for rotaries, AS LONG AS you disable the metering and either run a 2-stroke additive or an external mineral oiling setup.
I'm sure people have run straight synthetics but I'd be sketchy myself.
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have u actually owned a 13b before?
i have NORMAL metering and NO ADDATIVES.
and i use SEMI SYNTHETIC halvoline oil as recommended my mildrens my rotor workshop (the most respected one in adelaide) on all their cars.
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Location:
adelaide
Registered:
April 2003
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Re: 13b? yes? no? maybe?
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Thu, 08 July 2004 15:14
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7M-Brisbane : you might want to run that past you local mazda service centre/performance mazda engine builder and see what they tell you 
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