Quote:
Originally Posted by
Kev
Just to give you some info the Raptor boys are flowing 130CFM with their +2mm valves, big bore, high lift cams & strocked +3mm throttle bodies, motors producing over 80HP, thats nearly double our 45HP & air flow of a standard XT.
So when I see we only have max 88CFM left in the air box, this tells me for bigger builds we need a newly designed airbox.
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Hi Kev,
Nice to see you are back again,
Yes it is amazing how the data show what is happening in the real world!
The stock air box and filter configuration has a Volumetric Efficiency of 0.539 @ 7400 rpm,
Compared to the completely open air box without anything inside and 4mm plus throttle body that has a VE of 1.027( almost impossible for a naturally aspirated engine) , gives us a theoretical power of 85.75 hp!
Ok this can only happen in a perfect world, but 80 hp is very close!!
Can you please give me the following info concerning the raptor mods:
1.
RPM the the motor rev to, will it be 7400 or more?
2.
The cfm that you mentioned is what the head flows? And if yes at what pressure? (inches of water or millibars, would do).
3.
The stage 3 DNA air box will have interchangeable aluminum trumpets(velocity stacks) to help tune the length, could you please specify the internal diameters that could be useful and cover the Raptor etc. mods?
We are already working on the DNA Stage 3 air box, as soon as we will have the complete prototype I will start a new thread and post details, photos etc.
Regards,
Dino
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