4barrel 300-6?
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4barrel 300-6?
I bought this 1990 a while back...
I did not expect that this thing could suck so much gas thru the one barrel carb.
It has been retrofit to carb and from stick to automatic. 4X4... I get 10-12 MPG...
I would like to hear any positive or negative comments on goint to 4 barrel on an offenhauser dual plane intake with headers. If it won't cost me mileage I would like the extra power but would like to hear of some gains... They suggest an RV cam for 115 extra ponies.
Brent
I did not expect that this thing could suck so much gas thru the one barrel carb.
It has been retrofit to carb and from stick to automatic. 4X4... I get 10-12 MPG...
I would like to hear any positive or negative comments on goint to 4 barrel on an offenhauser dual plane intake with headers. If it won't cost me mileage I would like the extra power but would like to hear of some gains... They suggest an RV cam for 115 extra ponies.
Brent
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From: Mulege south Baja ca. Mx.
they probably butchered the whole thing and it never will work right again. I hope you dont have smog insp. where you are. you either need to put everything back the way it was or change everything to the older crab based systome.
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From: Mulege south Baja ca. Mx.
you are not going to see anything neer 116 HP with a cam chang. if you do some good head work then you will see some improvement with a mild cam and a small 4 burial carb. but you are complaining about MPG and these things are not going to help that much.
first you need to find out what they have done to make it run so badly and get it running good then see if you still want to spend the bucks to get more HP.
first you need to find out what they have done to make it run so badly and get it running good then see if you still want to spend the bucks to get more HP.
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Actually it runs great... just not alot of power. I think a tiny distributor twist will help. I do need to know which vaccuum port the vacuum advance is supposed to be on. I don't think the intake manifold is the correct one. That is my only other concern. I was told that 10-12 in a 4X$ is what most of the folks that have or had 300's expect...
That is why I am here... I want to get peak MPG with the carb. I do not have smog inspections to worry about.
I can run what ever I want...
Brent
That is why I am here... I want to get peak MPG with the carb. I do not have smog inspections to worry about.
I can run what ever I want...
Brent
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From: Mulege south Baja ca. Mx.
you say it runs real good but you also say it has no power and gets 10 to 12 MPG. that is bad and what you would have with a 460 auto or even a little less.
what did they do with the EGR? did they do away with the computer all together?
My 95 4.9 gets 18 to 22 Mpg and has moor power than I no what to do with. it its bone stock
in the 90s Ford got the 4.9 prety well setup and outside of a little head work you cant do much better than a stock 90s 4.9
there could be a good reason they sold you there experiment
but you can fix it
what did they do with the EGR? did they do away with the computer all together?
My 95 4.9 gets 18 to 22 Mpg and has moor power than I no what to do with. it its bone stock
in the 90s Ford got the 4.9 prety well setup and outside of a little head work you cant do much better than a stock 90s 4.9
there could be a good reason they sold you there experiment
but you can fix it
Postmaster
Joined: Oct 2006
Posts: 4,816
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From: Davis & Newcastle, CA
Agreed, 10-12 mpg is WAY too low for the 300. My 351 gets MINIMUM 12mpg and sometimes up near 14 or 15. You've got other issues to deal with before upgrading.
-Chris
-Chris
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Okay, here you go... I met this truck thru it's previous owner. He was a fellow hog dogger and I noticed this truck sittin there unused.
He told me it had a "bad motor" So I said swap it out.
He had no source for a deal and was quoted $1,200 for a 100K+ motor. I got him a '96 with 89k verifyable for 600... I put it in and he drove it around a little for a year and a half or two... I bought it...
To me low power means not a thrilling acceleration rate. It is a 3 speed automatic.
I wanted to know which port for the vac advance before adjusting the distributor timing. EGR... NONE hooked up... just an ol' single throat carb... No 'puter neither... Truck has a decent gear as it runs 70 at -2,000 RPM.
Brent
He told me it had a "bad motor" So I said swap it out.
He had no source for a deal and was quoted $1,200 for a 100K+ motor. I got him a '96 with 89k verifyable for 600... I put it in and he drove it around a little for a year and a half or two... I bought it...
To me low power means not a thrilling acceleration rate. It is a 3 speed automatic.
I wanted to know which port for the vac advance before adjusting the distributor timing. EGR... NONE hooked up... just an ol' single throat carb... No 'puter neither... Truck has a decent gear as it runs 70 at -2,000 RPM.
Brent
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From: Mulege south Baja ca. Mx.
what carb do you have?
with a vacuum gage test the ports on the carb and find the one that doesnt have vacuum all of the time and that will more than likely the one. if you find more than one that doesn't have vacuum all the time then let me know what carb and at which throttle positions they have vacuum and we will figure it out
with a vacuum gage test the ports on the carb and find the one that doesnt have vacuum all of the time and that will more than likely the one. if you find more than one that doesn't have vacuum all the time then let me know what carb and at which throttle positions they have vacuum and we will figure it out
Lead Driver
Joined: Feb 2003
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From: Oak Harbor, OH
Without the vacuum advance being hooked up properly it's going full advance at idle, and no advance on acceleration. That's the doggy feel. Look for a vacuum port on the SIDE or FRONT of the carb just above the base. That should be the one for the advance.
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Well I had 2 unused ports just above the base. One did nothing off idle and the other did have 0 vac at idle and increased just off idle.
I hooked to it and I seem to have vac advance now. It was attached to the port ABOVE float bowl shared via a "y" in vac line with the "evap tank" for lack of a better description.
I left the evap stuff where it was and put the advance on the aforementioned port and it seems to have added much acceleration type power but the MPG improvement is yet to be seen.
Now that this has been accomplished does it mean my distributor may have been too far advanced to compensate? I have not heard any pinging before or since...
It has the 96 balancer assembly and I ain't sure I have atiming mark...
Brent
I hooked to it and I seem to have vac advance now. It was attached to the port ABOVE float bowl shared via a "y" in vac line with the "evap tank" for lack of a better description.
I left the evap stuff where it was and put the advance on the aforementioned port and it seems to have added much acceleration type power but the MPG improvement is yet to be seen.
Now that this has been accomplished does it mean my distributor may have been too far advanced to compensate? I have not heard any pinging before or since...
It has the 96 balancer assembly and I ain't sure I have atiming mark...
Brent
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UPDATE...
Seems I have improved on fuel mileage just not sure how much.
It ran fine with distributor set where it was until it warmed all the way up and I "think" I heard pinging so I retarded it a tad and it idled poorly so I bumped it back halfway...
Since I deliver pizza at night with it we will know shortly....
If'n ya'll got me near double fuel economy I will have a fourth of july cookout And include those that helped out on the guest list!
Brent
Seems I have improved on fuel mileage just not sure how much.
It ran fine with distributor set where it was until it warmed all the way up and I "think" I heard pinging so I retarded it a tad and it idled poorly so I bumped it back halfway...
Since I deliver pizza at night with it we will know shortly....
If'n ya'll got me near double fuel economy I will have a fourth of july cookout And include those that helped out on the guest list!
Brent