Offroad-Express

Hi guys,

I'm just wondering if anyone has any comments on how good an idea it would be to remove the air filter from my engine bay, and plumb the snorkle straight through to the throttle body on the V6?

Would it give better economy?

Would it be stupid to rely on the sponge filter in the snorkle as the only air filtration going into the engine?

Comments gratefully received, good or bad.

Cheers

K&N may well make a high flow filter would that can fit the original air box,
they reckon they actually increase air flow. Dont know if id rely on just the snorkle foam.

yeah...... NAH...... probably not the best of things, pays to have that filter in the box. Then again, ya dont know if ya dont try

if you have too much time, have a read.........

http://www.outerlimits4x4.com/phpBB2/vi ... hp?t=74825

I run a K & N on piggy, Im not far off the filters 1st service, due bout 5 years ago..... if it travelled more than 5 km on each outing I might get concerned, being that yours is a daily driver its not a bad read

I wouldn't run without a good air filter. The damage small particles dirt and dust do to the engine outweights any perceived benefits.The snorkel foam is only a sort of pre cleaner and won't filter the air fine enough for long term reliablity of the engine.

As for pod filters and such like, they are OK on ya boy racer but not suitable off road in dusty or muddy conditions, IMHO.

If you want more air with good filtration get a bigger air box from a engine with significanty bigger cc rating and use a standard replacement filter and also use bigger pipe. Just remember that the pipe needs to flow as sharp turns can aler airflow.

I'm going to use a Terrano (2700cc)one for the 1800cc thats going in the zook. Will be changing the intake side of the airbox though as thats a bit restrictive. The pipeing needs to be aleast as big as the airflow meter or intake manifold entry.

what all these guys have said. also i checked my snorkle foam filter today and it has a hole in it. so i wouldnt be trusting my engine with it!

The other issue is if you go and hug a tree on your adventures and lose the top of your snork, then you have no filteration left. Same applies if you snork is damaged for other reasons.

A free flowing intake won't get you any better economy.
Your engine already has to throttle the intake air, less restriction in the filters etc just mean the throttle will be closed more to compensate.

Thanks for the comments so far. Might just get a bigger airbox I think.

KiwiBacon wrote:A free flowing intake won't get you any better economy.
Your engine already has to throttle the intake air, less restriction in the filters etc just mean the throttle will be closed more to compensate.

There are alot of people that will argue with that. I see it that the engine has to suck the air in and the easier it can get the air the less it has to work therefore better economy. same goes for a free flow exhaust.

Pete

Petemcc wrote:

KiwiBacon wrote:A free flowing intake won't get you any better economy.
Your engine already has to throttle the intake air, less restriction in the filters etc just mean the throttle will be closed more to compensate.

There are alot of people that will argue with that. I see it that the engine has to suck the air in and the easier it can get the air the less it has to work therefore better economy. same goes for a free flow exhaust.

Pete

Yes the throttle on petrol engines do hurt economy, but they're a necessary evil. Without them there's no way to control the engine speed or torque. Attempts at economy by reducing intake losses are futile. Install an inlet manifold vacuum gauge and see for yourself.
But exhaust improvements can have benefits.

The losses due to sucking air past the throttle induced pressure drop are measured in kilowatts. It's one of the main reasons diesels are a lot more efficient.

Petemcc wrote:

KiwiBacon wrote:A free flowing intake won't get you any better economy.
Your engine already has to throttle the intake air, less restriction in the filters etc just mean the throttle will be closed more to compensate.

There are alot of people that will argue with that. I see it that the engine has to suck the air in and the easier it can get the air the less it has to work therefore better economy. same goes for a free flow exhaust.

Pete

I see where you're coming from Pete, and yes the reduction of pumping losses will make any engine more efficient, however in a petrol motor the positive effect of this reduction will be greatest around wide open throttle - at cruise any pressure prop caused by crappy intake design will be grossly overshadowed by the throttle losses.