Size / Flow rate of Secondary Injectors

[Rgardner01]

I am planning on replacing my secondary injectors. I have found a source for aftermarket secondary injectors in 4 different flow rate sizes. ( 45, 65, 72, 80 ) I want to make sure I do not go to lean or to large.

I have tried to find the specs for the stock 2.5L S10 TBI injectors that are currently in use but have yet to find an answer.

I am guessing 45lb since the orignal TBI 700s on the S10 trucks where only a 1bbl single injector throttle body on a small engine capable of 170hp?

[Vulcan Grey]

Secondaries are 550 cc/minute, low impedance

Edited June 9, 2010 by Vulcan Grey

[bosbon_be]

maybe this can help:

http://users.ox.ac.uk/~ohare/engine.htm#h2

[Rgardner01]

Thanks

If they are 550cc then that should equal close to the 45lb injectors. They come in at around 480cc at 40psi so with the added Esprit V8 psi of 55-60 it should be close.

The 65lb might be an option to upgeade latter too. They roughly equal 680cc ~ 700cc

Here is the listing of what I have found. Roughly 100 USD each from Summit Racing. I am sure you could search the Holley part numbers and find them from other stores.

Edited June 9, 2010 by Rgardner01

[Vulcan Grey]

Did you check with www.fiveomotorsport.com ?

I source all my injectors from them and know some V8 owners that have as well.