I'm wondering which set up would be best for gas mileage, i.e. small paper filters or scoops. With the price of gas these days, it makes a difference. I usually run scoops around town but for longer road trips I have been running the paper filters. Any thoughts?
I don't think it would make much difference. Do the scoops have a filter of sorts in them? Posted using the Full Custom H.A.M.B. App!
Does a posi rear end use more gas to do a burn out then a non posi? If you care that much about gas mileage maybe you should get a prius.
X 2 most hot rodders don't build/drive V8 multiple carbed hot rods because they care about gas mileage.
Non-filtered air will increase fuel consumption over time, due to engine wear caused by all the dust etc. the engine eats. Apart from that, I wouldn't expect any diffrence as long as the filters aren't way too small.
However, if you run paper filters and they get wet once or twice they stop breathing and start choking and this washes your walls and destroys your rings and wrecks your engine faster than dust. Use screens to keep out the small pebbles, large bugs and chickens,etc.
As usual, a bunch of smart *** answers but it's partly my fault. I didn't state the question very well and the wrong photos were posted. I am wondering if the small filter area chokes up the motor and causes more fuel to be used. The scoops obviously don't choke the motor and have SS screens inside to deter trash, leaves, bugs, what have you. They are always run facing rear and I use them in town or short trips but usually run the filters on longer road trips. I am registered for Viva Las Vegas next month and it is a long, expensive drive from Albuquerque and I'm looking for ways to improve the mileage. Now, if you don't have anything productive to add, please move on to another subject and don't take up any more file space. By the way, the Vintage Speed dual carb set up works great, better than the 4-bbl I had before. Linkage is progressive, set at 65% of full throttle. Pin striping on cowl also used throughout the car.
Seriously, if the air cleaners have the paper filters they can start to choke your engine, especially if they've ever gotten wet.Besides ****ping out the mileage it can be tough on your rings as well. I found out the hard way. I suppose if your filters are new they are not to bad and you could pack an extra set just in case. Nice looking small block.
I can't say about the fuel mileage but the Rochester 2g's don't like to be force fed so turn the scoops around. Falfa may not have pulled away from Millner just before he crashed if he had done that. Yes I know another smart *** answer.
Those tiny filters and full cover caps could easily produce a restriction and a restriction there will effect performance and mileage. Id doubt that the pictured set up is barely enough with brand new filter. A few molecules of dirt don't help. Couldn't you find a bigger filter base? No what color did you say that car was ?
K&N makes small replacement filters that fit in those air cleaners. I had a problem with my flathead running super rich with those chrome louvered air cleaners. After I switched to the K&Ns it runs the same sans filters as with filters. Matt
We put those filters on my dad's j2 Olds and it ran like ****. We put the original bat wing air cleaner back on it and it runs like a champ. There must be anouther better flowing setup out there for you.
use a K&N air cleaner will not have any restrictions compaired to a paper element filter but size and how the air comes into the airhorn of the carb determines how well its mixed should be either a long straight shot or a smooth 1/2-1" radius if brought in from the side . but the best way to get milage is use a steady foot, every time you move your foot you squirt some gas from your accel pump into the motor and it adds up .
If you can figure out how to get a temp vacuum gauge into the top of the air cleaner ( without destroying it) and going for a little ride this will tell you how much of a restriction the filters are causing. There should be no vacuum inside the the filter housing on the carb side of the filter. If there is vacuum, the engine is ****ing all of the available air that has p***ed thru the filter and waiting for more air to force its way thru the filter and housing. That little trick also works on late model stuff too. vac guage into the intake tract will tell you if there is a restriction and if that $$$ cold air intake is necessary or an improvement. Couple Mileage secrets - The biggest gas pedal ratio that you can fit into a street car, and work comfortably helps this a lot. Dash mounted vacuum gauge that you can and will watch with a mindful eye.
A piece of transparent hose and some water makes a simple, accurate and very sensitive vac*** gauge. Either bend it into a "U" and measure the diffrence in water level between both sides, or let it **** water up from a open container, if I recall correctly 4" represents about 1% pressure loss so even quite small pressure diffrences will be very visible. Do keep in mind where the "measuring end" of the hose ends up, since moving air generally tends to cause a low dynamic pressure and what you want to measure is the static pressure. You want to find a nice calm corner away from where the air will be going.
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