Please Help!! I need to know what size injectors to use..

Joe_mama71 · 08-19-2002, 06:16 PM

I have a 351W I am putting in a 88GT. It has Ported Edelbrock Performer RPM heads, mild comp cam, stud girdle, low compression, crane gold rocker arms, ported trick flow track R intake, aeromotive fuel system.

What kind of injectors should I use??

What is my estimated hp??

gofastmercury · 08-19-2002, 09:33 PM

well, once you figure a horspower, it not too hard to get thet injector right. There is some room for error. Most engines run at about .5 pound of fuel per hp. so 400 hp would need 200 pounds per hour of fuel, or 25 pounds each injector. But you don't want to run the injector full open, just about a 80% duty cycle. So for this example it works out to 31.25 pound injectors.
400 X .5 = 200
200 / 8 = 25
200 / .8 = 250 ( duty cycle)
250 / 8 = 31.25 ( each inj)

Or you can play with the injector sizing calc. on this site. Its under "analyzer" on the far right on top.

fiveohpatrol · 08-19-2002, 10:09 PM

I'd say 36's if you can find any, but if not, then 30's should still work well

08-19-2002, 06:16 PM	#1
Joe_mama71 Registered Member Join Date: Sep 2000 Location: Milwaukee Posts: 11	Please Help!! I need to know what size injectors to use.. I have a 351W I am putting in a 88GT. It has Ported Edelbrock Performer RPM heads, mild comp cam, stud girdle, low compression, crane gold rocker arms, ported trick flow track R intake, aeromotive fuel system. What kind of injectors should I use?? What is my estimated hp??

08-19-2002, 09:33 PM	#2
gofastmercury Registered Member Join Date: May 2001 Location: calgary alberta canada Posts: 366	well, once you figure a horspower, it not too hard to get thet injector right. There is some room for error. Most engines run at about .5 pound of fuel per hp. so 400 hp would need 200 pounds per hour of fuel, or 25 pounds each injector. But you don't want to run the injector full open, just about a 80% duty cycle. So for this example it works out to 31.25 pound injectors. 400 X .5 = 200 200 / 8 = 25 200 / .8 = 250 ( duty cycle) 250 / 8 = 31.25 ( each inj) Or you can play with the injector sizing calc. on this site. Its under "analyzer" on the far right on top. __________________ 93LXcopcarSOLD14.3@96 @ 4500ft 2.02 60ft on street tires. my 67 ranchero NOT A 390 ANY MORE! 460! 3.70's cast manifolds, comp cams 262H, performer, 750DP 100K out of 79 F250 NEW(oct20/02)14.58@95mph 2.3 60 ft corrects to:13.86@100 66 merc comet351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver 12.3@110 @ 4000ft 1.69 60 ft corrects to:11.69@115

08-19-2002, 10:09 PM	#3
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	I'd say 36's if you can find any, but if not, then 30's should still work well __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

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