fuel supply side "vacuum" question

[fairdeal]

I have seen that page in the Racor catalog numerous times but never noticed the "clean pressure drop" line

looking at it now, (and going back to the source)

those number raise many questions - and there's no footnotes

starting with their roundoff, on the various PSI to bar equivalencies listed, make all those look suspect...


are those values measured at each "max flow rate"?

which filter element does it apply to - 2 or 10 micron? or there's no difference?

the two on far right: the same elements, but a 4:1 difference in pressure drop?

the unit with the integral primer - same element as the two to its left -

but different pressure drop

why? because its measured at a higher max flow rate?

for that matter, why does it have a higher max flow rate?


this kind of stuff makes me nuts......

[oldmako69]

Not sure if it's germane to the discussion, but my previous marine engine was a Ford 351 and I came with a Racor 3228TUL. I swapped that element for a 3232TUL. Its a much larger canister and my goal for additional filter life due to the increase in volume. I had not considered the change in pressure before I made the change. Of course, the mechanical pump on that engine could probably suck a golf ball through a garden hose.

It looks like the S3232 would replace the S3227 and increase the filtration.

[pstephens46]

Not sure if it's germane to the discussion, but my previous marine engine was a Ford 351 and I came with a Racor 3228TUL. I swapped that element for a 3232TUL. Its a much larger canister and my goal for additional filter life due to the increase in volume. I had not considered the change in pressure before I made the change. Of course, the mechanical pump on that engine could probably suck a golf ball through a garden hose.

It looks like the S3232 would replace the S3227 and increase the filtration.

The GD Germans got nutting to do with it!

[boscoe99]

I have seen that page in the Racor catalog numerous times but never noticed the "clean pressure drop" line

looking at it now, (and going back to the source)

those number raise many questions - and there's no footnotes

starting with their roundoff, on the various PSI to bar equivalencies listed, make all those look suspect...

Do the conversion. The math works.

are those values measured at each "max flow rate"? Yes, max flow rates clean.

which filter element does it apply to - 2 or 10 micron? or there's no difference?

the two on far right: the same elements, but a 4:1 difference in pressure drop? Different flow rates result is different pressure drops for the same filter element.

the unit with the integral primer - same element as the two to its left -

but different pressure drop

why? because its measured at a higher max flow rate? Yes.

for that matter, why does it have a higher max flow rate? Some motors have a higher flow rate. So a filter is stated as being acceptable for the higher flow rate. As long as the pressure drop is allowable.


this kind of stuff makes me nuts......

This is stupidly simple physics.