[caterd]

13b rotary need help

ihave recently purchased a 13b mazda with a racing beat intake and header with a 600 cfm holley and i am hving trouble with the compressor maps the only one that i can see that might be close to what i need is the T3 -50 trim does any body have a suggestion all the other maps are real close or in the surge limit

What i want is 7500 max rpm and 10 to 15 pounds of boost with a blow through
this is what i come up with

10 lbs boost
17.8 lb min
1.80 pressure ratio

15 lbs boost
21.3 lb min
2.17 pressure ratio

Any suggestions would be greatly appreciated

[Robert]

Originally Posted by caterd

13b rotary need help

ihave recently purchased a 13b mazda with a racing beat intake and header with a 600 cfm holley and i am hving trouble with the compressor maps the only one that i can see that might be close to what i need is the T3 -50 trim does any body have a suggestion all the other maps are real close or in the surge limit

What i want is 7500 max rpm and 10 to 15 pounds of boost with a blow through
this is what i come up with

10 lbs boost
17.8 lb min
1.80 pressure ratio

15 lbs boost
21.3 lb min
2.17 pressure ratio

Any suggestions would be greatly appreciated

The typical thing with rotaries is the amount of exhaust gas energy they create. The flow from the exhaust ports means you need a pretty large turbine housing. Just to be clear you are looking for about 213-220 CHP of air?

[Robert]

By the way, I'm guessing you have a raditor planned for this? Or some cooling system? The 13B tends to run on the hot side and most jetboats I've seen use a SBC or something like that with water getting picked up by the jet, circulated through the cooling system, and spit out the exhaust pipes. Are you doing the same thing here? Or did you mock up a seperate cooling system?

[caterd]

Originally Posted by Robert

By the way, I'm guessing you have a raditor planned for this? Or some cooling system? The 13B tends to run on the hot side and most jetboats I've seen use a SBC or something like that with water getting picked up by the jet, circulated through the cooling system, and spit out the exhaust pipes. Are you doing the same thing here? Or did you mock up a seperate cooling system?

Im planning on running water through the engine from the pump just like other jet boats with sbc or bbc
so really what would my cubic inches really be equevalent to

[Robert]

Originally Posted by caterd

Im planning on running water through the engine from the pump just like other jet boats with sbc or bbc
so really what would my cubic inches really be equevalent to

Your actual displacement is tiny in relation to other motors but the nature of the rotary design is that the exhaust gas volume produced per power stroke is much larger than a typical cylinder engine. I'd need to know more about what your power goal is before I could recommend a unit. Did you want the 250 CHP of air?

[caterd]

i would like to make 300 hp maybe more if i didnt have to run race gas

CHP ?

[Robert]

Originally Posted by caterd

i would like to make 300 hp maybe more if i didnt have to run race gas

CHP ?

You'll want at least a T04 compressor for that. I would say a T04E 50 trim with either an F1-62 turbine with a .82 or .96 A/R housing or a F1-65 compressor with a .63 A/R housing.

[caterd]

that will work with a blow thruogh set up right

Ohh ya what about the turbo calculations to get the lb/min and the pressure ratio , I guess that doesnt work for a rotary

[Robert]

Originally Posted by caterd

that will work with a blow thruogh set up right

Ohh ya what about the turbo calculations to get the lb/min and the pressure ratio , I guess that doesnt work for a rotary

It does, you should be running about 1.90 PR or roughly 13.3 PSI of boost to make 300 CHP of air

[Robert]

And yes blow through isn't an issue here provided your carb can support the amount of air needed for you to make 300 HP