Injector Ratings

[RedlineRacer]

I have been doing some research on injectors, and I am wondering why some are rated in CC's, and some are rated in lb's. Like, what CC would a 39lb @ 40psi injector be? Whats the conversion. Is the lb a domestic rating, and CC japanese (does CC mean Cubic Centimeters?)?

[Evil S14]

same reason we measure speed in km or mph, us americans just cant get the metric system which evreyone else uses

[SR20DETpwr]

I looked it up on google. MSD's racing link had injectors rated in lbs. under the domestic area and the injectors rated by cc. was under the import area. So, best I can tell the flow ratings are just a domestic/import thing - kinda like inches and milimeters. Also, since you are looking for the injector size for you I believe that 550cc injectors are rated up to 400hp, while the 740cc injectors are 400hp+ - if im wrong on that someone correct me. Hope this helps.

[RedlineRacer]

Well, I have access to some corvette injectors, and I am wonder what they are in cc. I believe they are 39lb. @40psi, but I don't know the CC. Just trying to see if they are like 500cc.

[Evil S14]

CC/MIN = LBS/HR X 9.71 OR LBS/HR = CC/MIN X .103

so itd be 378 cc/min injectors