Thread: snorkel - 3" reducing to 65 mm at turbo end

Mate

Running a 3" standard length snorkel used to trip my filter change indicator, so yes you will be restricting air flow. To what extent I don't know.

Justin

Originally Posted by rar110

I am looking for advice on the impact on air flow if I made a snorkel setup with the air filter on the roof rack, 3" pipe down to the passenger side guard, reduces to 65mm as it goes through the guard, continues 65mm to turbo.

Any advice appreciated.

The idea is to fit a WTA intercooler where the donaldson air cleaner is currently situated and get a snorkel with the deal. Effectively the intercooler would be the cross over pipe.

thanks

The losses induced by changing from 75 to 65 mm will be minimal as long as you have a transition that is reasonably smooth/gradual. However you will probably also have a bend there???

The much greater losses will be all the extra pipework. A larger filter with 4" outlet would be better, and try and retain 4" as long as possible, stepping down to 3" then 65 mm just before the turbo.

However the even better option would be not to have such a long length of pipework.

Originally Posted by DRanged

Mate

Running a 3" standard length snorkel used to trip my filter change indicator, so yes you will be restricting air flow. To what extent I don't know.

Justin

my donaldson filter housing has a 3" inlet that sits across the filter housing to achieve a larger opening on the housing at least. The pipe is about 100mm long. My filter change indicator is permanently on. Even with new filters and removing the safety element.

Originally Posted by isuzurover

The losses induced by changing from 75 to 65 mm will be minimal as long as you have a transition that is reasonably smooth/gradual. However you will probably also have a bend there???

The much greater losses will be all the extra pipework. A larger filter with 4" outlet would be better, and try and retain 4" as long as possible, stepping down to 3" then 65 mm just before the turbo.

However the even better option would be not to have such a long length of pipework.

thanks Ben. I cant see 4" pipe being viable from the roof rack to the guard. I agree it probably needs it. A short section may be possible from the filter housing on the roof rack to the windscreen. However, would it make much of a difference?

There will be two bends after it reduces to 65mm. The first inside the guard to direct flow toward the motor, and then a bend to feed into the turbo inlet which faces the firewall.

Originally Posted by rar110

thanks Ben. I cant see 4" pipe being viable from the roof rack to the guard. I agree it probably needs it. A short section may be possible from the filter housing on the roof rack to the windscreen. However, would it make much of a difference?

There will be two bends after it reduces to 65mm. The first inside the guard to direct flow toward the motor, and then a bend to feed into the turbo inlet which faces the firewall.

My suggestion (or implication) was to buy a larger filter box with 4" connection, and run 4" down the windscreen. The visual obstruction of a 4" pipe isn't much more than a 3" pipe.

You are right that a short section of 4" isn't worth the effort.

Originally Posted by rar110

my donaldson filter housing has a 3" inlet that sits across the filter housing to achieve a larger opening on the housing at least. The pipe is about 100mm long. My filter change indicator is permanently on. Even with new filters and removing the safety element.

Do you know what sort of CFM you would need to breath easy? I think I may have the same problem - would be good if I could get a inlet / filter system that wasn't a bottleneck.

Originally Posted by isuzurover

My suggestion (or implication) was to buy a larger filter box with 4" connection, and run 4" down the windscreen. The visual obstruction of a 4" pipe isn't much more than a 3" pipe.

You are right that a short section of 4" isn't worth the effort.

any suggestions on a filter housing.