85RotaryRocket

iTrader: (1)

People here are claling BS on 260 HP N/A 13b, ill find the dynos if i can, this is no BS.

The motor is a 4 port 13 b form an rx 4, rotors are from a second gen 91, . The motor is Fully built by Danny manning himslef (Canadian heads will know this name), Its an extended port which yields about 220 Hp, aggressive street / mild brige port, custom porting, from custom template again, from danny manning, has signature idle sound (womp womp womp womp @ idle).

stationary gears are reinforced, aluminum water pumps, port and polished intake manifold with direct injection, the intake system is completely modified, carb venturies opened up, 120 mm jets, complete exhaust, ring and pinion in rear, aluminum flywheel, twin fuel pump , FPR, complete msd, aluminum flywheel,runnign 2 6A boxes, with three blaster two coils, double remote filter mount, torque brace bar, electric fan, pully changed custom made, LSD, complete copper 4 row rad, factory race oil cooler, fully guted, but sitll stock seats and carpet (not for track thought seats come out)., but thats not going to give hp, so whatever.

The car ran 13.5 ¼ mile, ill try to get speed.
car has been brought up to 250 KM/ Hr, i can attest to that as i was in it

There is no bs, Anyone who knows Danny maning, and knows the silver 1st genrx7, the king of the hill champ for 5 years in a row @ mosport and they banned him, took down vets at the chevy / vet challenge @ slaloming , i forget location.

I wont get in to coilovers, Break setup, camber, subframe, transmission (5 custom ones for different race tracks, swapping 5 th gear from different years, and were using t2 trannies with custom gearing), and all that other good stuff

http://www.youtube.com/watch?v=GzTkQZOOQTs

Small smaple of the car.

ill try to find 1/4 mile slip, and see if the dyno sheet is still around.

OneRotor

iTrader: (3)

You cannot have direct injection with a carb.

'87 turbo II

iTrader: (1)

Yeah the direction injection threw me off? You realize Mazda has yet to produce and engine with direct injection for the public yet right?

Also, the rest of that build sounds a little similar to a few things I'm doing.

85RotaryRocket

iTrader: (1)

You can, the primarys would go through the inside (there may be a better word to use here, rem this is my brothers car , not mine, im a supra man, but this is my bors account)

http://www.vintagemazda.com/files/img/12a4portdcoe.jpg

There is a pic of what he has, similar set up

the two hole sin center are used for primaries, outside are secondaries, and what he did to his was the opposite, so the secondaries are going through the center.

i dont know the technical terms, but thats what i get fomr him, you want in detail stuff, ills ee if he has time to do a full write up

Extend Port

The extend port is a larger version of the mild port and works best with improved intake and exhaust systems. Typically with these modifications, the engine will start to exhibit the rotary’s signature rough idle, although the extend port’s is very slight. There is also a slight but noticeable loss of low-down torque below 4,000rpm. Importantly the increase in air-flow ability translates to the potential for around 220hp providing the best compromise for regularly-used street cars. This is the popular choice for those who don’t want the numerous drawbacks of a bridge-port.



PRO'S: Good power increase while retaining drivability.
CON'S: Increase of fuel consumption and noise and the need for modified intake and exhaust systems to maximise power.





Bridge Port

The Bridge port uses an additional "eyebrow" opening alongside the original "modified" port and introduces the characteristic lumpy idling. The bridge that now exists between the 2 ports primary purpose is to ensure the rotors corner seals – which pass indirectly over the bridge – don’t fall out. The improved air-flow increases top-end power dramatically with a noticeable power-band peaking around 8,000rpm while drivability, smoothness and fuel efficiency is reduced. Maximum power of around 260-280hp is largely dependent on the choice of intake and exhaust systems. Unfortunately for street cars, faster normally means louder.



PRO'S: Very good potential for power, increased rev-range
CON'S: Poor drivability, fuel consumption and excessive noise

I dont see why you guys are so surprised that its a 260 hp car, up here there a cpl of NA 13 bs making that power, really nothing SUper Mind blowing about it.

85RotaryRocket

iTrader: (1)

It is all custom made, nothing was purchased from anyone or anywhere.

PercentSevenC

I don't think "direct injection" is the term you're looking for (it means injecting fuel directly into the tops of the rotor housings, like a diesel). What I think you're describing is a "reverse runner" style manifold, which Mazda used stock on the CD (RX-5) Cosmo. Kind of a strange choice for a half-bridge engine, but whatever.

The reason we are incredulous is not that we think a 260 WHP NA 13B is in any way unusual, it's that the stock Nikki/Hitachi is a tiny carb. Stock, the Nikki flows just 313 CFM at 1.5" Hg; the Hitachi even less.

I'm prepared to believe 220 WHP for a half-bridge motor with a ported stock manifold and carb, but for 260 I want to see dyno sheets and pics of the carb.

85RotaryRocket

iTrader: (1)

Carb is not stock, it has been taken apart rebuilt, i can't tell you all the goodies as i dont know, but in no way is this a stock carb, more like a mutated carb sort of speak, tmro i will have all details 100%.

But i assure you its been as modded as much as possible to utilize all it can give.

My old man and brother ar elightyears ahead of me on the rx-7's. Ill get my old man to break it down in more details.

I knwo they have the hard copy of this

http://www.nocoastmotorsports.net/Ma...tionmanual.pdf

And there is some good info in there on stepping things up.

I know you guys want Proof, word of mouth is not enough, i feel you guys on this one, but believe me its a 260 Hp car, been with my old man for years, and now my brother has it.

DivinDriver

iTrader: (15)

Can someone enlighten me on how you can have a "half bridge" port?

Port's either bridged, or not, far as I can figure. Anyone got a pic so I can grasp it?

This part puzzles me:

That pic is the bottom half of a manifold for a dual DCOE setup, which uses two single-barrel carbs - - No way to put a Nikki on it no matter how much you modify it.

There's no "secondary" or "primary" involved when using DCOEs, and the design of that manifold does not differentiate flow between the inner and outer ports, it differentiates between front and rear rotors, one single-barrel carb for each.

j9fd3s

iTrader: (3)

i think your terminology is throwing us off. for example if you had direct fuel injection, why would you need the carb? one or the other, not both

second have you read the book in your link? its ONLY about the P port engine, and the special chassis parts they had available.

260hp is totally possible, my friends BP rx3 did 231 and climbing when it ran out of dyno

j9fd3s

iTrader: (3)

a half bridge port is when you only bridge 2 of the 4 ports.