Thread: Adverse effect of cyclone air filter on engine

I strongly doubt the cyclone would have any negative side effects as long as you have installed the correct size one for the application.

They have been used for decades in Ag and mining sectors, and are very effective.

The only negatives are when air throughput requirements are too high for the size unit, they will create restriction, and even noise pollution!

So long as you aren't getting these issues, I wouldn't worry, you could put a vacuum sensing switch on the intake to check.

Edit: how many horsepower is the engine?

Cheers

Originally Posted by shack

I strongly doubt the cyclone would have any negative side effects as long as you have installed the correct size one for the application.

They have been used for decades in Ag and mining sectors, and are very effective.

The only negatives are when air throughput requirements are too high for the size unit, they will create restriction, and even noise pollution!

So long as you aren't getting these issues, I wouldn't worry, you could put a vacuum sensing switch on the intake to check.

Edit: how many horsepower is the engine?

Cheers

I have no idea how many horsepower the engine delivers, it is a 4.2 liter fed with two SU HF44 carburetors.

I am experiencing a loss of power at high rpm

Cheers

I thought even the commercial Landcruisers had these as a standard fitting on their snorkels.

Originally Posted by lebanon

....

I am experiencing a loss of power at high rpm

Cheers

This could be due to so many factors, not just air intake(restriction).

Worn lifters, cam, or rocker shaft(assuming this 4.2 is a RV8) .. or carb tune, fuel pump .. etc.

Simple diagnosis is to remove the pre filter and see if you gain any lost power back on a run over a given road.

Originally Posted by lebanon

I have no idea how many horsepower the engine delivers, it is a 4.2 liter fed with two SU HF44 carburetors.

I am experiencing a loss of power at high rpm

Cheers

Pull the pre cleaner off and see if it goes away, if it does.. You may need a bigger one.

If you know the horsepower of the engine, you can work out how much air you need to flow, then hopefully someone supplies pre cleaners that have a CFM rating.

Just remember that the maximum airflow requirement of a petrol engine is only at maximum torque or horsepower .

At all other times the airflow requirement is governed by how open the throttle blade is and at usual operating the airflow is a fraction of the maximum requirement.

Having said that, when I used Unifilter socks in my RRC 3.9 snorkel, I could tell when the socks were starting to impede airflow as the engine felt constrained after about 3 days use.

The only real way to ascertain impedance to airflow is to place a Magnahelic pressure gauge in this case on the outside near the cenrifugal filter and the other sensor in the snorkel. This will give the pressure drop in inches of water . Under 10 is good over say 30 is bad.
Your filter body probably will give more impedance than the snorkel.
My wife doesn't like the one when I place it on my D2 TD5 because of the noise it makes.

Regards PhilipA
PS , IMHO it is only desirable and necessary to fit if you are on long stretches of dirt.

Originally Posted by PhilipA

PS , IMHO it is only desirable and necessary to fit if you are on long stretches of dirt.

Seems possible given the OPs location...

Seems possible given the OPs location...

Hmm Lebanon is mostly mountains with a coastal strip.

I dont think there are large stretches of dirt except in the mountains and certainly not many/any bulldust stretches or long tracks like the GRR as in Australia.

I chickened out on going to Lebanon from Syria as many expats were being carjacked in the Bekaa valley when I was there in the 80s. I accidentally got onto the Beirut highway in Damascus but turned around as soon as I could even though I had an invitation from our Beirut based Locally Engaged Staff. Have looked over Lebanon from Crack de Chevalier.

One of our friends in DFAT was held as a hostage in a cave in the Bekaa Valley for AFAIR 8 weeks but luckily lived to tell the tale.

Regards PhilipA