fuel injection question
11-19-2006, 05:11 PM
#1
Thread Starter
Join Date: Feb 2006
Posts: 37
fuel injection question
I am needing some help with gathering the rest of the fuel injection things for my engine swap. I have a 77' 351w bored .030 Flat top pistons, typhoon intake, .472/.496 cam with .214/.224 duration, and now i am trying to figure out what size fuel injectors to use if i get afr 185's? also what brand mass air meter anyone recommends? Also will i have to change my fuel lines? What size fuel pump do you think i need? Trying not to spend a sh$%t load either if at all possible. Any recommendaions on other engine parts also? I am deployed right now so when i get back i plan on getting the afr 185's and subframe connectors.Any help appreciated
11-19-2006, 11:33 PM
#2
6th Gear Member
Join Date: Feb 2006
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Posts: 5,263
RE: fuel injection question
24# injectors might cut it, but will be border line.
stock rails and fuel lines will be fine.
ProM makes a nice meter.
get a windage tray
190lph fuel pump or 255 if you plan on nitrous
stock rails and fuel lines will be fine.
ProM makes a nice meter.
get a windage tray
190lph fuel pump or 255 if you plan on nitrous
11-21-2006, 12:26 AM
#3
Thread Starter
Join Date: Feb 2006
Posts: 37
RE: fuel injection question
i was thinking 30# injectors. What about the camshaft that i have? Is a windage tray worth the money? also will i have to change out my throttle body? I was also thinking about one of the sets from ford racing for the fuel injectors/ mass air meter? What kind of rockers will have to get for afr heads?i plan on using my stock 302 valve covers also will my typhoon intake clear the valve covers?
12-11-2006, 05:42 PM
#4
Join Date: May 2006
Location:
Posts: 14
RE: fuel injection question
IF you are looking for injector size then you need to have a realistic estimate of your horsepower. Not RWHP but BHP.
Horsepower (HP) x BSFC ÷ number of injectors ÷ Duty cycle = proper injector size
1. HP - When using this formula be realistic when determining your horsepower - two big of an injector can make you car run rich and boggy.
2. BSFC - non-assisted cars (no NOS or super/turbo-chargers etc) BSFC is usually .50. Power adder cars BSFC is usually .65.
3. Duty Cycle - injectors work there best at no more than 85% of their capacity.
It would look somethig like this. Just saying you have 350HP at the crank N/A.
350 (HP) x .50 (BSFC) / 8 (number of injectors) = 21.875 / .85 (Duty Cycle) = 25.73
Kind of hard to estimate without knowing exactly what you got but now you have the process to figure out the injector size.
Good luck.
Horsepower (HP) x BSFC ÷ number of injectors ÷ Duty cycle = proper injector size
1. HP - When using this formula be realistic when determining your horsepower - two big of an injector can make you car run rich and boggy.
2. BSFC - non-assisted cars (no NOS or super/turbo-chargers etc) BSFC is usually .50. Power adder cars BSFC is usually .65.
3. Duty Cycle - injectors work there best at no more than 85% of their capacity.
It would look somethig like this. Just saying you have 350HP at the crank N/A.
350 (HP) x .50 (BSFC) / 8 (number of injectors) = 21.875 / .85 (Duty Cycle) = 25.73
Kind of hard to estimate without knowing exactly what you got but now you have the process to figure out the injector size.
Good luck.
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