Now that I think about it, I can test the strainers/filters on my other Z given that it fits those horns. That's a good point, although I'd imagine it would be difficult to "foul" these strainers, especially considering your previous statement: "Those Pierce strainers are not "filters", they're rock strainers." Just six main jets? And when do you change them? And depending on fouling factor, variable enrichment at that!īut not all restriction is the same! Edited Octoby Tony D The relative delta p across that strainer is different at idle and at 7,000 rpms WOT. This is a most basic carburetor principle of proper filtration, that float bowl is vented to the same ambient pressure as Venturi throat. The phrase "if you know what you are doing" indeed applies. Ambient pressure is still on the float bowl.Ī filter will cover the float equalization hole, so as filters plug, the pressure present at float bowl is relatively similar to the Venturi, so the car does not start to run progressively richer as the filter / strainer plugs! Those Strainers restrict only the VENTURI. What do they restrict compared to a proper filter box? Restriction is pumping loss. I'd be interested to see restriction numbers, not AFR or jets changed. Changing 6 main jets, if need be, is not difficult.Just six main jets? And when do you change them? Tuning these carbs is very simple, if you know what you're doing. The point of testing is to find out how much of a restriction it presents. They are no substitute for a proper filter which will be more effective, and less restrictive. They're a vintage-look throwback for the racing cars of old. Simply scoring cylinder walls from dust and sand will still happen. They serve no purpose other than keeping a piece that will catastrophically fail the engine out. Those Pierce strainers are not "filters", they're rock strainers.
So chances are good, it it looks restrictive, chances are it is, and testing will quantify it. And at minimum flow, closer to 10" of Inlet Restriction (the maximum allowable with plugged inlet filters!)Ī standard witch's hat strainer with finer mesh is usually no more than 10" at maximum flow.
#Velocity stack air filters full#
In testing this weekend, at full flow, the shorty strainer had the water manometer almost sucked out into the inlet. It looks restrictive to me, compared to traditional witch's hat strainers. That hat strainer will look like a dunce cap, almost 4' long-a long cone with lots of surface area. A standard witch's hat strainer usually is put in place of the "maintenance spool" a piece of pipe 4' long on the inlet to allow removal of casings, etc. I am familiar with witch's hat strainers, having used them for the past 25 years during commissioning. These particular strainers are made in China, and are sized to fit in place of our standard expansion bellows on the inlet piping of the machine. It was my first startup where I was able to measure a drop on a 'witch's hat' startup strainer. I can relate the following from a compressor startup I did this past weekend in Vincomin Vietnam. You wouldn't run them because "they look very restrictive"? Not a great reason, is it?
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