Performance info needed...
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Freshman User
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From: Cleveland
Performance info needed...
I was sitting around, and a thought came to me. On an '86 F-150, how much difference would it make to have a split manifold and 4 barrel carb? And then I realized, you people would know. How would these things affect gas mileage, speed, and general performance of said truck?
Thanks in advance,
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Thanks in advance,
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FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
On a 1 cylinder? No, probably not as a split manifold wouldn't work. Could you provide just a bit more info? In fact, how about going into User CP and setting up a signature that tells us so we don't have to ask.
(I assume you mean a six, but I've learned to not assume.)
(I assume you mean a six, but I've learned to not assume.)
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Freshman User
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From: Cleveland
300 inline 6. Man I bought it from loved to tinker, and it works, supposedly. As in, it runs. Haven't had the time to really dig in to this new one. He just mounted the four barrel carb (incorrectly) and converted to a spit manifold. And I'm pretty new as a poster, but have pretty much always have lurked around here for tips, so once my first 10 days are up, I'll make sure to fix me a signature.
FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Ok, now that you've explained I'm sure someone will come along that knows. But, in the immortal words of Bob Dylan, It Ain't Me, Babe. I've not done that to a six.
But, I can talk in generalities. In spite of what the rags say, in my experience freeing up the exhaust does not help MPG. But, it sure does help RPM. Unfortunately the 300 isn't normally wound up much so I would not expect that allowing it to breathe on the top end would help dramatically. But, that is my interpolation based on my experience with V8's and may well be wrong.
As for MPG, that is helped by getting a good strong vacuum signal in the carb, and that is done mainly by the size of the throttle plates. (It is also helped by better designs of venturi, but that's another story.) And, a small 4bbl can have smaller throttle plates than a 1bbl since the 4bbl has the secondaries and not everything has to flow through the primaries. So, a small 4bbl can actually help MPG - as long as you stay out of the secondaries.
But, I can talk in generalities. In spite of what the rags say, in my experience freeing up the exhaust does not help MPG. But, it sure does help RPM. Unfortunately the 300 isn't normally wound up much so I would not expect that allowing it to breathe on the top end would help dramatically. But, that is my interpolation based on my experience with V8's and may well be wrong.
As for MPG, that is helped by getting a good strong vacuum signal in the carb, and that is done mainly by the size of the throttle plates. (It is also helped by better designs of venturi, but that's another story.) And, a small 4bbl can have smaller throttle plates than a 1bbl since the 4bbl has the secondaries and not everything has to flow through the primaries. So, a small 4bbl can actually help MPG - as long as you stay out of the secondaries.
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Freshman User
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From: Cleveland
Thanks, but that's leads into the improperly mounted carb. He set it up where you're not getting two primaries, but one primary and one secondary. It'll just take a little time to fix, but I wish he would've saved me the time. He was more of a Renault man, I mean the only Renault man, in east TN.
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From: Cleveland
I THINK (keyword), don't hold me accountable, that it was a Holley (also can't spell; it's late). Can't give you much more than that at the moment... I'll get out tomorrow and see if I can't snap a pic of it for ya. You could probably tell me more by that than I could describe, anyway.
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FTE Legend
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From: Northeast, OK
Actually, you spelled it correctly. And I won't be able to tell any more than you as I don't know Holley carbs. But, I can google it.
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From: Cleveland
You've already helped a lot-I just wanted to know what would be helping me and hurting me if has prices were to shoot up, and I'm already praying they don't. Thanks again, and I'll be back around soon with another simple questions about something or the other, I can guarantee it.
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