What port would you go with to make MAX HP? Im just taking in some opinions

 

i'm no engine builder, but i would go perif if streetability isn't an issue

 

Its for a back halfed drag FC

 

PP all the way !

Just make sure you get a billet crank made, you will break the std one.

Oh, and do not expect any less than 1200BHP from the engine.

 

Rice Racing ,not to throw the subject off but what are the options for stronger craks on the two rotor? is that the weakest point on the tso rotor? what does ABle use for a crank? i am asking because if there is enough interest i can have them custom made ( my father owns an aerospace machine shop) it seems like enough people on the list would buy them at whatever the cost just to make sure it will not break...i know i would but i cant afford to make just one or two

 

Marcus,

I believe Crispeed mentioned a while back that some company in Japan makes a stronger ES for the 13B but it's something like $3k.

Cary

 

Well duhhhhh, what do you think we are gonna vote for .

 

3 rotor PP!!!

 

GO GREG GO!!!
PPort that ****

 

fo' real! PP all the way! no torque or hp at low rpm's, but who cares about that on the 1320?

 

I cant wait for next years season to see the crazy numbers people are going to be putting down.

 

I HAVE THE CONTACTS FOR CUSTOM CRANKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!

A certain Aussie rotary guru is using one in his 13BPPT currently making 830HP..................

well whatdayaknow, thats rotary guru has already posted in this thread.........

 

I always had a feeling 2 rotors wouldnt be enough for you greg...

 

You can go for a 4 rotor crank from Jeff Bruce .. New Zealand...
There's enough TORQUE on that to spin the Earth around!!!!

Hes also makes a custom 3 rotor crank which has a reasonable
PRICE!!!

 

OK ....so what's the horsepower limit on the 20B ecentric shaft while limiting it to 8500rpm before it breaks ???????????????

Or does the breaking have to do with higher rpm ????

I know the MX-3 w/ 20B is still running the Mazda ecentric shaft and he spins it past 9krpm !!!!!! when launching..

John D.

 

Hmm, i am in NZ, hmm i chat to Jeff Bruce on ICQ, i wonder if he is the contact?????????

 

I was informed that Marcos revs at near 10k rpms at launch and shifts near 9k. I also heard the same thing about the 8500 rpm breakage limit. I was speaking to a guy that had a 20 b in his rx3 and he said that mazda makes 2 different eshafts for the 20b , is this true??? he said that there is one that will spin to 10k rpms. You know anything about this eshaft?

 

I heard the earlier 20B engines had problems with their E-shafts and Mazda did some type of recall on those engines to replace the E-shaft. Later 20B engines sported the better E-shaft.
Not sure how true this is........anyone have any info on this ???

Anyway to tell the difference between both generations of the 20B? ...my 20B better be the later version

John D

 

I think that the better E-shaft was from the 13G. You may want to check with Mazda Motorsports. I really doubt that anybody has ever broken an E-shaft while driving around town in their stock luxury car, so the recall doesn't sound realistic to me.

The early Cosmo engines have a an aluminum-colored intake, while the later engines have a black-colored intake.

 

Since we all seem to like spending your money I'll say peripheral port.

 

If I go with the Periphial port then I will need a custom manifold. Anyone have any tips on what to use as the collector. Smooth air flow is my main concern.

 

Why waste at least 3 grand on a 20b if you are going to peripherial port it... unless you are going to make the peripherial housings yourself that is... What I'm thinking is this... if you buy a 20b, and then 3 PP housings from racing beat or something, you are replacing 50% of the motor. Just build a frankenstein 13b 3 rotor (I say that like its easy ) and save some dough. It sounds like you'll be buying a different Eccentric shaft anyhow...

just some food for thought.

the more I think about, you'd probably have the housings made out of the 20b housings... but its just an idea...

 

I myself and an engine builder will be doing the PPort so I wont have to pay for this. The only thing im gonna have to pay for is the apex seals, motor, and the intake manifold.

 

Does the 20B have a 3rd main bearing? If someone builds a "frankenstein" w/ 13b parts what do they do about it?
Just curious,
Don.

 

Hey Greg!
A certain buddy of mine told me that his friend just bought a shaft from Mazda for a lot of $$$$$$ that's guaranteed to hold! According to them no more 1100RWHP limit! If that's true then this certain person might just break his present record and go for that 6 sec. 200mph run!
BTW. When the shaft broke before it would also take out the center bearing and destroy the housing also. The damage to the housing would be in the area at which the center bearing/gear would have bolted to the housing. Lets just say the entire casting to which the gear was bolted too would crack and the gear would become seperate form the housing!
A BIG MESS!!

crispeed
87TII
9.20@150mph