Better flowing intake?
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Better flowing intake?
Ive got a 95 306 roller engine with a 500 cfm 2bbl holley. The truck runs good and everything Im just wondering if there are any better flowing 2bbl intakes out there. The one i have on my truck is from a 72 e100. I looked at summit and the ones they have all have the adapter for an egr and i do not have an egr. Any ideas?
Cargo Master
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From: British Columbia
2V intake manifold
Jordan,
I don't know how the flow compares, but there was an aluminum factory 2V intake made from 1979 on or so. If you scrounged up one of these at least you'd save a bunch of weight, and it would be softer for any do it yourself port matching, etc.
I don't know how the flow compares, but there was an aluminum factory 2V intake made from 1979 on or so. If you scrounged up one of these at least you'd save a bunch of weight, and it would be softer for any do it yourself port matching, etc.
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The aluminum 2bbl manifold will save some weight, but probably has no performance advantage. If you are happy with the 500 2bbl, you could try an aftermarket 4bbl manifold with an adapter if you have hood clearance.
Having run one of those and a small (390 cfm) 4bbl on a 289, I'd make the change to a 4bbl.
Having run one of those and a small (390 cfm) 4bbl on a 289, I'd make the change to a 4bbl.
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A 500cfm 2bbl is crude sledgehammer of a carb, I bet you would see improved power and fuel milage with a 550-600cfm 4 bbl with vacuum secondaries... smaller primary bores for higher air velocity which equals better fuel atomization, and more total airflow for better top end.
Hotshot
Joined: May 2003
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From: south louisiana
Power ? No. Mileage ? maybe, depends on how it's driven. I've run both the 500 2 bbl and later a 600 4 bbl on an otherwise stock 302 (69 van) and the 4 bbl did nothing for it over the 500 2 bbl. The mileage improvement wasn't even there.
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Im not after more power or better milage although if either one came with the different intake i wouldnt bat an eye, but thats not my goal. Comparing the stock intake to anything else ive seen it just seems to me that the intake i have is very restrictive. Also adding insult to injury it was off a van so i know performance was not in mind when it was made. Im more less trying to help the engine breathe better
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also to add about the vacuum secondaries on a 4bbl. I dont know at what vacuum they would open so that would be a concern considering at idl ive only got 17lbs but ive only ever messed with mechanical secondaries so im not real familiar with how or when the vacuum secondaries open/close
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Yes you're right if... the carb is tuned properly for the motor and it or the intake is not a choke point on the motor in question. It doesn't matter how many barrels it's drawing through if the motor is getting the right amount of air and fuel there are no gains to be had with something bigger. Is that the case here? I don't know but there are more options available with a 4bbl and if it turns out the existing 2bbl intake is a choke point then at the very least it shouldn't hurt milage or power to go to a 4bbl setup.
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FTE Legend
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From: Ottawa, Ontario
also to add about the vacuum secondaries on a 4bbl. I dont know at what vacuum they would open so that would be a concern considering at idl ive only got 17lbs but ive only ever messed with mechanical secondaries so im not real familiar with how or when the vacuum secondaries open/close
Hotshot
Joined: May 2003
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From: south louisiana
also to add about the vacuum secondaries on a 4bbl. I dont know at what vacuum they would open so that would be a concern considering at idl ive only got 17lbs but ive only ever messed with mechanical secondaries so im not real familiar with how or when the vacuum secondaries open/close
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A 500cfm 2bbl is crude sledgehammer of a carb, I bet you would see improved power and fuel milage with a 550-600cfm 4 bbl with vacuum secondaries... smaller primary bores for higher air velocity which equals better fuel atomization, and more total airflow for better top end.
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Looking at it from the perspective of what is accomplished with EFI these days.. yes it's a crude sledgehammer. I won't argue it's performance on a motor it's well suited for, but if crude is defined as a basic device with no bells or whistles then the description fits IMO. But don't mistake that as a condemnation of carbs by me, all the motorcycles I have in the garage have carbs on them and they deliver exceptional performance, driveability, and fuel milage so I see no need to upgrade them. But then all those carbs are a constant velocity design with a vacuum actuated slide valve behind the hand operated butterfly, so they're a little more advanced than the very basic controlled fuel leak we're talking about in this thread.
Cargo Master
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Back to the original question, Jordanz you are asking for an intake that "breathes better", but then you post,
"Im not after more power or better milage"
So, what exactly is the point of changing the breathing characteristics of the intake manifold?
"Im not after more power or better milage"
So, what exactly is the point of changing the breathing characteristics of the intake manifold?
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