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  #1  
Old 02-06-2010, 11:21 PM
Sasquatch Sasquatch is offline
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Default What size injector is the best for a built 4.0L?

I was been told a 24lb injector is the best for a built 4.0 motor but i'm not sure. What is the best for a built semi everyday drive?
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  #2  
Old 02-07-2010, 10:18 PM
bigcountry bigcountry is offline
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a mustang 5.0 uses a 19lb injector so why would a built 4.0 with 2 less cylinders is going to need anything bigger than a 24? unless your going to build a turbo charged or supercharged 4.0 i dont see why you would need that big of an injector. now someone else may be able to chime in but i would really be surpised if a 24 worked. so built you are saying bored stroked ported and polished. if thats it then why upgrade to a bigger injector
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  #3  
Old 02-08-2010, 02:03 PM
beaujt beaujt is offline
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well i don't remember how big of an injector the ranger has stock, but most of what i've heard, for the amount of horses you'd be able to get out of a hopped up 4.0L anyways, 19lb injectors should be adequate even if you do put a supercharger on or turbo. the big limiting factor on those motors anyways is the serious lack of intaking air, that'd be my focus rather than the fuel. i.e. porting the heads and such.
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waiting for: dual steering stabilizer, put on 3" body lift(in my room), dual shock setup, electric fan, possible SAS with a waggy D44
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Old 02-10-2010, 03:21 PM
Sasquatch Sasquatch is offline
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I'm doing the port and headers also a high flow system later hoping to drop a supercharger on it. So i'll go with the 19's and see what happens. I should be fine if i'm bores .020 over with high compression right now?
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  #5  
Old 02-10-2010, 07:30 PM
bigcountry bigcountry is offline
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yea u should
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General Geroge S Patton
2007 3.0
automatic trans, 4.10s with L/S
ported and polished TB
4brand new speakers with inslation in doors
smoked tail lights
20%tint on driver and passenger windows
5% tint on back window
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  #6  
Old 02-10-2010, 07:58 PM
Sasquatch Sasquatch is offline
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do you know anything about the throttle body? Figure i want to put a 66mm or if i should stay stock and put a helix spacer on?
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  #7  
Old 02-10-2010, 09:18 PM
Redrocket Redrocket is offline
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bigger t body will help i got one.. also got the spacer too but that didnt seam to do much lol
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  #8  
Old 02-10-2010, 10:02 PM
bigcountry bigcountry is offline
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spacers are pointless on a throttle body they work great on carbs but the more distance you put between the tb and the intake the worse it will be and alot of them "sprial" which is worse a tb motor needs smooth air not spinning air. and yea a bigger tb would help a good bit if you built the motor
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Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity."
General Geroge S Patton
2007 3.0
automatic trans, 4.10s with L/S
ported and polished TB
4brand new speakers with inslation in doors
smoked tail lights
20%tint on driver and passenger windows
5% tint on back window
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  #9  
Old 02-12-2010, 11:21 PM
beaujt beaujt is offline
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x2 on the spacers, save your money on the TB spacer, they suck! just save your money and buy the bigger TB if you end up hopping up the motor otherwise its pretty pointless.
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93 ranger ext. cab 4.0L auto 6" SJ/custom lift--37" super swamper truxs M/T tires--lock rite locker w/ 4.56 gears up front--warn hubs--exploder 8.8 w/ disc brakes 4.56 gears and detriot locker--one-piece driveline--bushwacker cut-out flares--Bilstein 5150 shocks--2 10" xcite subs w/ 1600W Crunch amp-- tinted windows

waiting for: dual steering stabilizer, put on 3" body lift(in my room), dual shock setup, electric fan, possible SAS with a waggy D44
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  #10  
Old 02-15-2010, 06:19 PM
98blownranger 98blownranger is offline
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I have a 66mm tbody, your for $150.
as for the injectors, 24# is the size you should run for a well build motor, make sure your MAS is set for a 24# injector also. the older injectors were 14# the newer 4.0 OHV had 19# what year do you have. I also have a larger MAS with a set of injectors i don;t need along with a few other 4.0 parts to go fast.

How are you going to be high compression?? 98 heads on a 97 or older?
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  #11  
Old 02-22-2010, 02:00 PM
Sasquatch Sasquatch is offline
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Quote:
Originally Posted by 98blownranger View Post
I have a 66mm tbody, your for $150.
as for the injectors, 24# is the size you should run for a well build motor, make sure your MAS is set for a 24# injector also. the older injectors were 14# the newer 4.0 OHV had 19# what year do you have. I also have a larger MAS with a set of injectors i don;t need along with a few other 4.0 parts to go fast.

How are you going to be high compression?? 98 heads on a 97 or older?
The high compression was a trick up the sleeve for my mechanic he never really stepped up and told me what he did but i trust him. I'll see what he did forsure and get back to you on that one. Also i'm interested in you T-body, MAS and injectors. What would be the price be for all? Also what other parts do you have? My ranger is a 2000 4.0L OHV.
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  #12  
Old 02-22-2010, 05:13 PM
Tee Rev Tee Rev is offline
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2.9's had 14# injectors, 4.0L's have always had at least 19# injectors.

When I built my first 4.0L,(91 shortblock, 95tm heads, 422 cam etc ...) I initially used the stock injectors & stock tune without issue. I eventually installed a 155 lph fuel pump, 24 lb injectors & MAF for the larger injectors. I didn't gain any power but I did get some peace of mind.

I've since installed a Standalone speed density ECU & have realized a whopping 7hp gain over the factory EEC IV tune. Just goes to show that the factory ECU is very forgiving!

Trev
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