i been looking to use these. i found there 48mm at opening taper down to 40mm and 44mm where the injector leads in.



also read that they measure 50 mm at the inlet and 42 mm at the outlet.



not sure wich is true...



i found that the injectors are 200cc (19lb) so im pretty sure that will not be enough. im looking for stock replacement larger ones right now. i want to use the stock rail and injector placement. anyone know where to get some larger injectors for these itb's? or where to get stock injectors rebuilt and bored to a larger size?



the plan is to use these on a very large brige 12a or 13b N/A.



the TPS shouldnt be a problem, i plan on using a Megasquirt for the lowbuck appeal.



im still looking for what inner diameter runners to use for the manifold and how long they should be...any tips? (for drag racing application, 1/4 mile)

 

just found out, Honda s2000 injectors are a direct replacement. so that takes care of that problem.

 

4x42mm is BIG, i think it sizes up like my buddies 13b holley BP. 750 holley is like 2x42mm and 2x48mm or something



so anyways, you need a big flowing engine, to use that thing

 

i know there kinda big. im still looking for smaller ones. but i have seen these used on s2000's and honda b series motors. and a few other cars. plus, i have seen twin weber style set ups with 48mm on 13b's.



an idea i had to use these was also, to block one opening off. and just use three itb's. one for the primarys. and each secondary gets its own. but then it would just look stupid and i'll have to modify the rail and everything else. so i'll most likely use these if i cant find smaller ones.



i just have to get a good tuner...and a large port with correct shaping and everything else...

 

i was looking to make one similar to this. but with a slightly longer runner length, with a small curve. so its not againt the wheel well/wall.



http://i282.photobucket.com/albums/kk253/b...tbsonrotary.jpg



or one with a plenum, like this i made in paint...



http://i282.photobucket.com/albums/kk253/b...tbandplenum.jpg



im just not sure in either design for the diameter of the runners.

 

You don't meed a big flowing engine to use these, it will increase your throttle response in a way you never thought possible.



As for injectors, remember that the stock injection system is staged and you should be looking for injectors in the 440 - 460cc range.



Keep us updated on how this works! I am really interested in trying something like this on a turbo motor but using a surge tank also.



-Maniac



Edit: your first pic kinda looks like the 787b setup lol.

 

so you agree with a plenum in the middle. or would it be better to build a plenum around the throttle bodys? (kinda like stock rb26 or 4ag 20v)

 

Where did you get the ventri's for those tb's? i want some! that looks awesome!!!