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The filter restriction gauge is calibrated in inches of water, about 20 for "full red".

Inches of water....

Jim: Take some readings and let's compare! I'm at 3,000 ft btw. Robert: I honestly don't think the screen could have much effect on anything except perhaps small birds. Almost tempted to run without a filter....sombody talk me out of it!

This one should be just right: http://cgi.ebay.com/MAGNEHELIC-PRESSURE-GAGE-DWYER-MODEL-2310-NEW-IN-BOX_W0QQitemZ7599689547QQcategoryZ55825QQrdZ1QQcmdZViewItem Or this one: http://www.creative-analog-and-digital.com/EbayListings.htm

I'll say, keep looking, you need to be able to see the reading while driving so a full scale of 10 inches of water should be good or the equivalent in cm of water, which would be about 25 cm of water full scale. My readings were all below 20 cm of water. BTW, the Magnehelic gauges can be...

Jim, get a low pressure gauge on ebay! They are listed all the time, keyword "magnehelic". They go for less than $10 usually and are calibrated in inches of water, cm of water, pascals, psi or other. Simply run a plastic tube from the air filter canister to the gauge and you are good to go. I...

Measuring the restriction of the air filter is a little tricky while driving, but I took the deuce to the store this morning and checked the numbers as I was driving. According to this site, the comparisons are made at 350 CFM. http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm Driving at...

Chime in and correct me here if I'm wrong. The engine displacement is 478 cubic inches, which is 0.276 cubic feet. For 2,000 rpm, the air flow is displacement x rpm divided by 2 = 276 CFM During turbo boost there is the additional flow as a fraction of atmospheric pressure to add in, so for a...

This from knfilters.com : For maximum efficiency, diesel air filter restriction should be less than 25 inches of water vacuum, compared to a gas motor which uses only 10 inches of water restriction. Since diesels work harder at pulling air into the engine this creates a greater opportunity for...

All the multifuel engines have this intake manifold. It's only cooling for high boost, doesn't do much for anything less than 6-7 psi after the engine warms up. It's not going to reduce the temp below engine op temp.

Right, the intake manifold is a double walled aluminum casting, cooled by the coolant. The thermocouple probe was inserted in a part that is not double walled near the entrance to the cylinder #5 (image above).

Installed a vacuum gauge with a wider range to measure the vacuum in the filter canister. Made another test run. With a pyro reading of 1,100F and a boost of 11 psi, the vacuum reading was 20 cm of water. That was the max I saw. This is a new filter with about 1,000 miles on it (courtesy of...

The results are preliminary, but interesting never the less. The filter vacuum reading is inconclusive since the gauge pegged out at 2 inches of water. Incidentally, the air compressor is getting its air from the canister as well, but there was no indication on the gauge when it was loaded...

Mounted the DVM/thermometer on the air intake since the thermocouple wasn't long enough to reach the inside of the cab from the intake manifold adapter. :-)

Installed two more temperature probes today to measure the effect of the water cooled intake manifold. Drilled a 1/16 inch dia hole at the cylinder #5 intake (see image) and also a 1/16 inch dia hole in the intake manifold adapter. Two thermocouple bead type probes were installed. I also...