Thread: Intake systems

We've spent a lot of time on the dyno and road testing with different vehicles and facing 4" snorkel openings in all different directions.
We did have a problem with one vehicle (non land rover) when we faced it straight back, at highway speed we had much higher egt's.
We twisted the head slightly inward and the problem went away.
The direction of the head doesn't make a massive difference, the size of the intake, the amount of bends and the size of the bends is where you will make your gains. Straighter the better and long flowing bends.
If you're running a pod or high flow filter with the snorkel facing backwards, be prepared to listen to a lot of induction growl.
I have a 4" stainless snorkel on our defender, it works a treat.

I'll bite.

If you have a normally aspirated engine and you stick a large (and I mean large) funnel at the front of your car that feeds the air intake you will get a good ram air effect. This was proved many years ago in a Mercedes (don't ask me which one google it).

If you have a turbo or supercharger you are actively sucking in a lot of air so the Snorkel head is way too small to make a difference. In fact if you have a V8 engine the engine sucks in massive amounts of air and the snorkel heads are way too small to make a difference. I have seen the calculations on this site before.

The direction of the snorkel head has some bearing one how much mud and crud gets flung down the snorkel, thats all.

Originally Posted by Gullible

...In fact if you have a V8 engine the engine sucks in massive amounts of air ...

Not compared to a diesel the same capacity at the same rpm (even NA, let alone turbocharged).

Originally Posted by aptfab

We've spent a lot of time on the dyno and road testing with different vehicles .

Any idea how a Donaldson pre filter effects performance ? Bob

In conjunction with isuzurover ...the diesel is a different kettle of fish as the amount of air they consume is considerably more than any petrol (2x equivalent size ?) ...the transitions will be as smooth as possible however the Donaldson air box is the restriction (3" inlet/outlet)...intake noise is my last worry but as another member on here likes to say a pod filter is more just a pod no filter...interesting finds on egts I must say...

Just do your own 4" - pretty sure the Safari was never designed to feed what you're planning to hook it up to.

A 3" inlet/outlet filter might be enough, but as I posted recently I've observed that hooking it a 3" snorkel and corrugated ducting definitely creates a restriction. I'm sure I can improve my setup, but a 4" snorkel would be a better starting point IMHO (especially since you're a lot more fueled up than I am).

Dougal suggested recently to run one of the Donaldson "Informer" indicators to show the level of restriction. Seems like a useful tool for backyard intake development.
When my "Informer" arrives, my plan is to disconnect the snorkel, see what the restriction is with just the air filter/housing, then play around with the snorkel ducting etc to try and minimise the restriction when its hooked up.
I'll also be able to check what effect the Hi-Flo Donaldson tupperware bowl has on it when fitted.

Steve

Originally Posted by steveG

Just do your own 4" - pretty sure the Safari was never designed to feed what you're planning to hook it up to.

A 3" inlet/outlet filter might be enough, but as I posted recently I've observed that hooking it a 3" snorkel and corrugated ducting definitely creates a restriction. I'm sure I can improve my setup, but a 4" snorkel would be a better starting point IMHO (especially since you're a lot more fueled up than I am).

Dougal suggested recently to run one of the Donaldson "Informer" indicators to show the level of restriction. Seems like a useful tool for backyard intake development.
When my "Informer" arrives, my plan is to disconnect the snorkel, see what the restriction is with just the air filter/housing, then play around with the snorkel ducting etc to try and minimise the restriction when its hooked up.
I'll also be able to check what effect the Hi-Flo Donaldson tupperware bowl has on it when fitted.

Steve

Thanks Steve you've convinced me to do a 4" snorkel now where did you source the informer from ? Direct from Donaldson ?

Originally Posted by c.h.i.e.f

Thanks Steve you've convinced me to do a 4" snorkel now where did you source the informer from ? Direct from Donaldson ?

I'm lazy -found a NOS one on eBay for around $30 delivered.
No idea what Donaldson price is. If its less than $30 don't tell me!!

Steve