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Ram Air Vfr?


Voided76

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I learned the hard way that bigger is not always better when it comes to our air boxes...

 

My friend Stephen called long distance from England because he just
installed a $900.00 HRC air box on his RC45 and saw 120HP on the
dyno... mmmmm... together we wondered if the stock box be modified???

gallery_3131_51_178065.jpg


We found that stock RC45 throttle bodies are 46mm but the air box was
restricted to 40mm... no problem... I'll bore the air box out to 47mm
on the milling machine...
gallery_3131_51_12643.jpg


I drew up plans for 47mm bell mouth based on the stock 40mm bell
mouths and purchased a block of black Delrin...
gallery_3131_51_61101.jpg


I'm not happy doing repetitious work but I labored long hours to
machine 4 each bell mouths with my best accuracy...
gallery_3131_51_60103.jpg


Don't you love when a plan comes together especially if it turns out
perfect???
gallery_3131_51_73307.jpg


Now I had an unrestricted air box with my own 47mm bell mouths... it
was the best I could do to replicate HRC $900.00 air box... not to
mention I wanted to keep  my home made K&N filter...
gallery_3131_51_44329.jpg


Time to put the Mod to the test... this is Dave at Chandelle
Motorsports...
gallery_3131_51_181600.jpg


No joy... I lost 1.8HP on the dyno... so bigger is not better in this
case... a whole week worth of work shot down in flames... it seems
Honda got the intake velocity right for a stock  pipe after all... air
boxes are like tuned instruments... alter the holes and the tune
suffers...
gallery_3131_51_28985.jpg

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