NA Questions

[neil_jdmr]

I know that 400hp can be achieved going 3 rotor NA with PP etc but what sort of figures can be achieved staying with the twin rotor. I mean is say 300hp a possible target with the right porting/tuning.
 
I know NA tuning is a very expensive way to go fast and im not thinking of going this way but iam interested to know what the NA rotary capabilities are.

[Prof]

I\'d say you could get close to 300bhp with a big Bridge Port on an NA engine, definitely possible with a PP ported block.  The power band, smooth though it is, will be moved up the rev range - so peak power will be when the engine is revving it\'s nuts off, but the sound is good
 
http://www.youtube.com/watch?v=SrAjhimVaU0

[CharlieP]

Would be pretty boring though :Tongue1

[HaywardRotary]

I have built 13b PP\'s that make around 310hp at 8900 rpm.The feel of power is near to what twin turbo FD feels like at revs.
Regards
Carl

[Rex_FTW]

That sounds interesting Hayward.
 
What sort of price are we looking at?
 
Do you have any dyno sheets so I can view the power band of the 310hp engine?
 
Cheers

[SiH]

Would be pretty boring though :Tongue1

A high revving NA is anything but boring! It\'s a joy to work an NA though high revs, and with a throttle response that it\'s nigh on impossible to come close to with a turbo!
The thought of a high 200\'s NA in an FD or better still, in an NA MX5, is hugely appealing!

[CharlieP]

So why have you got turbos then :p

[SiH]

So why have you got turbos then :p

Because it\'s a hell of a lot cheaper

[HaywardRotary]

Here is another one with slightly higher in the revs peak power.
Notice that at 4500rpm it is already 100hp.
regards
Carl

[neil_jdmr]

That dyno sheet looks like a great powerband and revving out at 9500 sound like my cup o tea.
 
I think that would be an amazing sounding and probably very drivable engine.
 
What would the internal wear and tear be like on an engine like this? i mean would it be in a similar bracket to high power single turbo 13b\'s due to the level of modification and such closer tolerances when getting pushed or would the NA factor reduce this?.