Naturally Aspirated Performance Forum Discussion of naturally-aspirated rotary performance. No Power Adders, only pure rotary power! From the "12A" to the "RENESIS" and beyond.

k20 vs 13b both na

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Old Nov 15, 2009 | 07:30 PM
  #151  
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Yo Ozvasquez no updates? Let see how it went
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Old Nov 17, 2009 | 07:00 PM
  #152  
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I don't think the competition is a drag race.

The competition will be tough since streetability, and all out HP numbers are key. This would be a pain in the ***, but has anyone suggested a huge streetport combined with a semi PP? There needs to be a way of getting good port volume but minimizing exhaust/intake overlap for good streetability (lower idle & slightly quieter).

I would say the rotary would take it if you were building race only motors. Getting the exhaust to flow sufficiently while not getting pulled over everyday will be the issue.

Good luck!
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Old Dec 20, 2009 | 09:49 PM
  #153  
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update

the other car never made to the assembly line. the guy broke his ankle in a car accident. this happened about 3 months ago. so i slowed down and started a turbo build for the starlet.
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Old Feb 17, 2010 | 01:29 PM
  #154  
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awwww. he knew he would get owned
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Old Feb 17, 2010 | 06:07 PM
  #155  
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too bad, sucks to break your ankle

my recent experience with the K-honda engine was the 25 hours of thunderhill

ALL of the K motors failed, ALL of the backups failed, except the spoon car. this is something like 8 out of 9 engines failed.

the rotaries i think all finished

so does the K24 make BIG power? yes. can it make power for very long? no
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Old Feb 19, 2010 | 01:04 AM
  #156  
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Originally Posted by rotormind
As far as I no, john padilla rx7 made more hp in his allmotor rx7 than all the hondas including the k series. He was killing the Honda allmotor tuning class until they changed the rules. The 13b was the dominant engine in that class so I'm pretty sure the 13b has a good chance if done properly.
not only did padilla make more power,he also had a minumum weight disadvantage. that is the only way nhra could get the honda's to be comptetive.
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Old Feb 21, 2010 | 10:04 AM
  #157  
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wow i did not know the rotary boys hated hondas as much or more than us nissan boys.... lol thats awesome
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Old Feb 21, 2010 | 11:46 AM
  #158  
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Originally Posted by g14novak
As much as I like rotaries, that K20 would stomp the **** outa the 13b.

Just for the 13B to put out what a K20 does stock, the 13B would have to be ported so far it wouldn't be legal to drive on the road at idle, not to mention under some throttle...

You'd need a GOOD full bridge n/a 13B to match a stock block tuned K20 FYI. Start putting internals in the K20? Game over.
I'm trying to remember if it was SonicRat or JRat who was putting down 600 whp on a stock internal, street ported 13b.
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Old Feb 21, 2010 | 12:59 PM
  #159  
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you may be talking about JRat, i think i remember that. however, you need to remember these guys were planning to run N/A, not turbo.
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Old Feb 21, 2010 | 01:17 PM
  #160  
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I did read the rules and didn't see anything about turbo, I figured that would be included in "any mod to engines".
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Old Feb 21, 2010 | 10:32 PM
  #161  
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um thread title??? both na????
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Old Feb 21, 2010 | 11:38 PM
  #162  
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D'oh! My bad. In that case yeah, you're probably stuck. The closest you would get probably is using Rx8 rotors, balancing everything perfectly and then running 12,000 rpms or so. You'd still be doing good to get to 250hp though.
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Old Feb 22, 2010 | 07:13 AM
  #163  
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RX-8 rotors aren't all that they are cracked up to be.

A streetable bridge port shouldn't have trouble making 250hp... at the wheels. Plenty people make close to that at the crank with a street port. No crazy RPM necessary.
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Old Feb 22, 2010 | 10:13 PM
  #164  
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Originally Posted by Richter12x2
D'oh! My bad. In that case yeah, you're probably stuck. The closest you would get probably is using Rx8 rotors, balancing everything perfectly and then running 12,000 rpms or so. You'd still be doing good to get to 250hp though.
id agree with u on dyno numbers...b ut as far as 1/4 mile times i think the 13b could stomp it.. tkaes a **** ton to make a civic hook
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Old Feb 23, 2010 | 10:37 AM
  #165  
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Originally Posted by torch'd
id agree with u on dyno numbers...b ut as far as 1/4 mile times i think the 13b could stomp it.. tkaes a **** ton to make a civic hook
Do you really think that 13B cannot make more?
All motor 13B http://www.youtube.com/watch?v=fHO1sTqPapE
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Old Feb 23, 2010 | 02:30 PM
  #166  
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idk...never torn one open to try... but a garage build with not going pp, i would put dyno money on the honda. although i love 13b's soooo much more.
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Old Feb 23, 2010 | 03:37 PM
  #167  
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Originally Posted by torch'd
idk...never torn one open to try... but a garage build with not going pp, i would put dyno money on the honda. although i love 13b's soooo much more.
It seems that Honda engines are bolt-on power to certain level, but don´t forget that K series aren´t cheap at first place. Nothing like that for rotary, all must be done by trial and error, experienced people aren´t going to let cat out of the bag
but it can be done with stock internals

Just for fun, what do you think, how much HP has above car?
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Old Feb 23, 2010 | 04:56 PM
  #168  
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Originally Posted by Liborek
It seems that Honda engines are bolt-on power to certain level, but don´t forget that K series aren´t cheap at first place. Nothing like that for rotary, all must be done by trial and error, experienced people aren´t going to let cat out of the bag
Are you kidding? There is a WEALTH of information on porting, clearancing, reliability mods, and tuning. The only secrets are with the people who raised the bar and got 105% and don't want to divulge how they got that extra 5%.

I'm having a hard time just trying to find out what timing I should start with for my VW/Audi product. If it was a rotary, and I asked, I'd get about 12 answers in two days and 11 of them would be the same.

And yeah... I could build a kickass rotary for less than a pair of camshafts for a K-series would cost. And Honda engines have VTEC so they idle smooth, very boring to drive in the city. Might as well be a Camry.
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Old Feb 24, 2010 | 11:22 AM
  #169  
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Originally Posted by peejay
Are you kidding? There is a WEALTH of information on porting, clearancing, reliability mods, and tuning. The only secrets are with the people who raised the bar and got 105% and don't want to divulge how they got that extra 5%.
****, I didn´t mean it in this way... I agree with you on every point. All the info is available, but when it comes to port timing and intake/exhaust tuning, most people get confused

Originally Posted by peejay
I'm having a hard time just trying to find out what timing I should start with for my VW/Audi product. If it was a rotary, and I asked, I'd get about 12 answers in two days and 11 of them would be the same.
Maybe because people are more familiar with one most usual geometry of rotary(13B) than immense variation of piston engines...

Originally Posted by peejay
And yeah... I could build a kickass rotary for less than a pair of camshafts for a K-series would cost. And Honda engines have VTEC so they idle smooth, very boring to drive in the city. Might as well be a Camry.
This is the point what I tried to say, but my english isn´t good enough to clear up what I have in mind
I think many people ignore basic fundamentals when building wankel engines or any other ICE engine... I grow up on 2-strokes and learned one basic thing, one modification isn´t going to work well without many others....
I´m sure you have it very well covered, 100 MPH in 13B street port at given weight is much success. Its sad when people who invested a lot of money into their fully build N/A engines with very agressive porting struggles to run 100+ MPH in much lighter cars
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Old Feb 24, 2010 | 11:47 AM
  #170  
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Originally Posted by peejay

I'm having a hard time just trying to find out what timing I should start with for my VW/Audi product. If it was a rotary, and I asked, I'd get about 12 answers in two days and 11 of them would be the same.

And yeah... I could build a kickass rotary for less than a pair of camshafts for a K-series would cost. And Honda engines have VTEC so they idle smooth, very boring to drive in the city. Might as well be a Camry.
yeah its so easy with the honda, its all chipped ecu's so you start with stock, advance it, see that it doesn't add any power, and either go back to stock, or leave it there and let the engine detonate itself to death....

one of our race buddies has an immaculate TSX, and those cams are EXPENSIVE, and um might make the valves fall out of the head...

http://www.prima-racing.com/
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Old Mar 8, 2010 | 08:29 AM
  #171  
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Originally Posted by Wankel1der
sorry to break some hearts but i seen built K20 hatches destroy 500 whp supras... so an n/a rotary i would think is no problem. especially considering the age of the technology in the rotary being used here.
supras With 2jz they make high hp numbers but dont run hard at all intill like 650hp. k20s are overrated I been there done that build that 13b na dont put it in a Starlet put it in a 1st gen . give it a nice port job do little things here and there .do some rear end work to the 1st gen put some BFG G-Forces on it or some Nitto 555 if you have to run street tires you need to hook up nice that will be the key.hooking up change the gears in the back and you wil mop that Hondas *** all over the track . and thats a FACT ....
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Old Mar 12, 2010 | 11:30 PM
  #172  
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what about having those new aluminum rotors they have been testing ot scream out some serious rpms n power across the board
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Old Mar 12, 2010 | 11:32 PM
  #173  
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looking at that video remember jesus had to add 500 pds to his chassis and still beat that honda, so figure thats 5 tenths
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Old Mar 12, 2010 | 11:50 PM
  #174  
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Originally Posted by torch'd
wow i did not know the rotary boys hated hondas as much or more than us nissan boys.... lol thats awesome
Yes it so dam true, my hatred all started when when this punk *** kid with the
usual ricer body kit and goya can muffler reving his 89hp engine at the stop light.

Long story short,i eat his *** for breakfast,and then begun my hitler like hatred of smug honda owners..
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Old Jan 14, 2025 | 04:02 PM
  #175  
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Supra MK4

And I’ve seen tuned MK4 Supra’s blow the doors off Honda hatches too! It goes both ways!! It’s all about how deep someone’s pockets go!!!

another car that’ll be a nightmare for a hatch is a Toyota Starlet! JZ powered Awd!

@Wankel1der;8861004]sorry to break some hearts but i seen built K20 hatches destroy 500 whp supras... so an n/a rotary i would think is no problem. especially considering the age of the technology in the rotary being used here.[/QUOTE]
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