injector size help 2.55L ohc (pinto) Stroker - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 3 (permalink) Old 06-07-2010, 03:08 AM Thread Starter
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injector size help 2.55L ohc (pinto) Stroker

i want to upgrade my 1986 ranger 4x4 2.3L 5spd by using the crank/rods /pistons from a 98-01 2.5L with a little hotter cam and a .040" overbore. well since i had no idea injector size was easily changed i had not looked into it-so i came across an article that said stock was 14lb/hr and 17lb/hr was available from some ford vehicles and 19lb/hr was also a choice. my goals are a modest 140-150 hp ,stock was 110hp -with 12 more cubes ,more compression,and more cam should i choose stock-17lb or 19lb ?also what does ford call the STOCK fi system on the 1986 ranger ? any help will be great! thank you!
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post #2 of 3 (permalink) Old 06-07-2010, 06:23 AM
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Re: injector size help 2.55L ohc (pinto) Stroker

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post #3 of 3 (permalink) Old 06-07-2010, 12:14 PM
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Re: injector size help 2.55L ohc (pinto) Stroker

Careful buying injectors to upgrade. Your originals are rated at only 30.45 psig, and most being sold are rated at 43.5 psig rail pressure. Based on the original injector size and anticipated power (37% increase), your new injectors should flow about 19 lb/hr at 30.45 psig. This will require injectors rated at 23 lb/hr at 43.5 psig, and at the lower pressure your system runs, will actually flow the 19lb/hr. The closest common size injectors are 24 lb/hr.


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