Donaldson Pre-Filter - Noise

[Jelly_Sheffield]

So whilst fitting a new headlight ready for MOT (broken adjuster mechanism) on the Hilux, I went ahead and fitted the raised air intake that's been sat in the shed waiting for me to get round to it for ages (because I don't want to voluntarily repeat removing the wheel arch trim).

Because the whole point of adding the raised intake was to prepare it for dusty environments, rather than using the supplied ram air intake, I put a Donaldson type bowl filter on.

Photo showing what I'm on about for the uninitiated.

Turns it generates a rather dramatic whirring sound when you accelerate, which is something I had never noticed on plant equipment fitted with them (presumably due to a combination of operating noise, increased distance from the cab, and the fact most plant runs at a steady throttle adjusted by lever/thumb wheel/screen.)

It's not significant (compared to other road noise), and has a rather dramatic flair to it, but it occurs to ask if this is normal behaviour?

 

[Morrisman]

Induction roar, right next to your head.
Check your mpg after fitting it too, I’ve heard horror stories….

 

[Jelly_Sheffield]

Induction roar, right next to your head.
Check your mpg after fitting it too, I’ve heard horror stories….

I would hope the ECU map is sophisticated enough to account for any change in Mass Air Flow and reduce the fuel flow accordingly, rather than over-fueling.

I will have to keep an eye on it and see if there's an effect...

 

[Anguz]

Induction roar from the throttle bodies on my kitcar can be heard over the exhaust.. exhaust is on my side of the car, inlets other side

 

[Trevorleach]

Noticed any lack of power up long hills etc?

 

[Melvyn Best]

Induction roar from the throttle bodies on my kitcar can be heard over the exhaust.. exhaust is on my side of the car, inlets other side

On mine, the throttle bodies are on the drivers side but it sounds great especially when on full throttle

 

[Jelly_Sheffield]

Noticed any lack of power up long hills etc?

No, went out of my way to test this running some errands earlier, and it's still got plenty of oomph.

Comparing the under-wing intake pipe with the snorkel and Pre-Filter, there's actually a greater Cross-sectional area for air to be drawn in and flow through now, than there was with the OEM part.

 

[Morrisman]

No, went out of my way to test this running some errands earlier, and it's still got plenty of oomph.

Comparing the under-wing intake pipe with the snorkel and Pre-Filter, there's actually a greater Cross-sectional area for air to be drawn in and flow through now, than there was with the OEM part.

Same as blowing air through a pipe or hose, the longer the hose the more resistance. It’s not necessarily the diameter that makes the difference, but the length.

No rude comments gents.

 

[Jelly_Sheffield]

Same as blowing air through a pipe or hose, the longer the hose the more resistance. It’s not necessarily the diameter that makes the difference, but the length.

No rude comments gents.

I would expect diameter to predominate over length, being that CSA (the parameter that matters) would increase as the square of diameter, whilst the length does not have an exponent.

Running a very crude calculation with Crane TP410 data, the 75mm diameter and sharp 90° bend in the OEM part, would give about 1.2-1.3 times the frictional losses compared to the raised intake with 104mm diameter, 3 × 45°bends, and 4 × length.

 

[Erie Fred]

I have a very similar prefilter on my Ford 7610.
If it sounds like a singular note (a whistle) consider altering the blades/openings to be un-even in size.
You could try it with some duct tape, to simply make a few slightly smaller openings.

 

[Jelly_Sheffield]

I have a very similar prefilter on my Ford 7610.
If it sounds like a singular note (a whistle) consider altering the blades/openings to be un-even in size.
You could try it with some duct tape, to simply make a few slightly smaller openings.

The noise doesn't really bother me, unless I have the window down and am driving at low speed it's drowned out by tyre rumble anyway.

Also you have given me mild tractor envy, the 7610 is a nice little machine.

Not that I have space for one, as my partner would quickly remind me if she got wind of the thought...

 

[Erie Fred]

The noise doesn't really bother me, unless I have the window down and am driving at low speed it's drowned out by tyre rumble anyway.

Also you have given me mild tractor envy, the 7610 is a nice little machine.

Not that I have space for one, as my partner would quickly remind me if she got wind of the thought...

I'm getting tired of climbing up & down on it....

 

[Jelly_Sheffield]

Check your mpg after fitting it too, I’ve heard horror stories….

I will have to keep an eye on it and see if there's an effect...

So after 478 miles of driving in the last 2 days, we came out with an MPG of 28.9

That's there or thereabouts what it was doing before fitting, on similar runs.

Considering the tyres and the fact I remapped the engine to 160hp, It's not bad going, compared to the official figure of 32.2