Simplified Vacuum Lines
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Simplified Vacuum Lines
I decided to attempt eliminating all the BS additional vacuum lines in my 78' f-150. It has a 400 and in the late 70's they decided to do a lot of dumb emissions crap. Right now I have the vacuum line from the tranny and from the distributer/vacuum advance hooked up. I've plugged everything else and it seems to run fine but I have concerns. Is there any chance I'm doing any damage to anything? Hate hate hate vacuum lines and would love to hear if anyone else successfully emulated most of theirs. Thanks!
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Joined: Mar 2011
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From: Taxachusetts
Agreed.
One of the easiest way to dump a lot of vacuum lines is to get a new 4v intake.
Whatcha mean dumb emisssions crap/retarded timing, low compression? They made our trucks run like *****! Who could ask for anything more? Hahaha
One of the easiest way to dump a lot of vacuum lines is to get a new 4v intake.
Whatcha mean dumb emisssions crap/retarded timing, low compression? They made our trucks run like *****! Who could ask for anything more? Hahaha
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4v Motorcraft right? I would rather not worry about getting an edelbrock aftermarket set up. I was told you can re-jet a Motorcraft to have the same "high performance" CFM edelbrock's offer. Is that true?
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Joined: Mar 2011
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From: Taxachusetts
[QUOTE=RevJones; I've plugged everything else and it seems to run fine but I have concerns. Is there any chance I'm doing any damage to anything? [/QUOTE]
No, no damage is being done...did you dump/fix/plug your EGR unit? Might make it run a bit hotter (leaner) with it capped off.
Re-jetting your Motorcraft probably won't do diddly squat for performance unless you add some other aftermarket stuff - headers (a free-er flowing exhaust), for one, a "bigger" cam, etc. All you'll do by increasing jet size is make your vehicle run a bit "richer", leave some sooty deposits on yer plugs and generally waste gas.....not to mention changes in tuning the carb, maybe a hotter plug, etc.
If you're in a higher altitude, yes, but for the most part, without other "perfomance additions", you should be good to go.......let it be until you add some other go faster stuff. The CFM isn't going to change with different jets......just how much fuel is added to the mixture under different situations.
My opinion? Stay with the Motorcraft until you can afford some uprades...like headers, a Weiand and a Holley.
No, no damage is being done...did you dump/fix/plug your EGR unit? Might make it run a bit hotter (leaner) with it capped off.
Re-jetting your Motorcraft probably won't do diddly squat for performance unless you add some other aftermarket stuff - headers (a free-er flowing exhaust), for one, a "bigger" cam, etc. All you'll do by increasing jet size is make your vehicle run a bit "richer", leave some sooty deposits on yer plugs and generally waste gas.....not to mention changes in tuning the carb, maybe a hotter plug, etc.
If you're in a higher altitude, yes, but for the most part, without other "perfomance additions", you should be good to go.......let it be until you add some other go faster stuff. The CFM isn't going to change with different jets......just how much fuel is added to the mixture under different situations.
My opinion? Stay with the Motorcraft until you can afford some uprades...like headers, a Weiand and a Holley.
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From: Northeast, OK
Right. Jetting, or re-jetting, only changes the air/fuel ratio, meaning how much fuel is in however much air gets pulled through the carb. And an engine wants 14.7 units of air for a unit of fuel to make max power. (Yes, I realize we give most engines more like 12:1 for max power, but that's really because some cylinders run rich and some lean.)
But CFM, or cubic feet per minute is a rating a carb is given that explains how much air will be pulled through it at a given vacuum level. That's not something that can be changed on a given carb. So, if you want more air and fuel to come in you need a larger carb. However, that can cause other problems, like poor drivability.
But CFM, or cubic feet per minute is a rating a carb is given that explains how much air will be pulled through it at a given vacuum level. That's not something that can be changed on a given carb. So, if you want more air and fuel to come in you need a larger carb. However, that can cause other problems, like poor drivability.
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