Outer Limits 4x4 Board

Okay I know there has been a few topics on this, but I dont know of anyone who has done it yet.

Has anyone yet come up with a working solution on a 1hz or similar motor. Im keen to get some on board air and really want an endless air style system rather than electric.

endless actually has a braket hit for 1HZ 80 series. from memory it lifts the existing air cond compressor up a little bit and squeezes the endless compressor underneath, possibly the other way around (drops the air cond comprssor with the endless on top). I don't know that there's really any other alternative.

Gday
Ive seen photos a setup on a diesel 80, using the air cond belt.
The compresser is a Camira unit which is shorter than the endless air compresser, so it fits where the power steer reservoir sits now.
A Hyundai idler pullet that is for a flat belt replaces the air cond idler, and the air cond belt is lengtherned to fit under the idler, and over the compresser b4 returning to the crank.
I think there will be issues with belts cracking and the endless air idea is better...i would get the brackets from them and buy a compresser from the wreckers off most mitsubishi's, the sandon 508.
OR u can buy electric driven air cond compressers and use the full battery to pump up the tyres on this and every 4b u will own forever.
Andrew

dow50r wrote:OR u can buy electric driven air cond compressers and use the full battery to pump up the tyres on this and every 4b u will own forever.
Andrew

Gidday Andrew
Like the sound of electric driven. Do you mean install an electric motor turning a belt which in turn turns a normal air conditioning compressor, or is there a electric compressor that can be purchased?

Must say, this could be the idea I was looking for. Hmmm food for thought

A guy on another forum posted a picc of a commercial unit that looked like a starter motor connected to an air cond compresser...i thought it was a n excellent compromise considering u can lend it round or swap it from vehicle to vehicle. Will see if he has still got the addy
Andrew

http://onboardair.com/ is the US site - Oasis Trailhead is the compressor. Opposite Lock have them

http://oppositelock.com.au/detail.asp?d ... ixkey=6604

and

http://oppositelock.com.au/detail.asp?d ... ixkey=6771

Just found another post that has the $ figure

http://www.outerlimits4x4.com/PHP_Modul ... ight=oasis

Ouch. Might see if I can do something portable myself for $1600

Pesky Pete wrote:Ouch. Might see if I can do something portable myself for $1600

could probably pick up a 4 horsepower 4 stroke job with a nice big tank for that sort of $. won't exactly fit under the back seat though

I am looking at some industrial style motors at the moment for this application. Starter motor draws far too much, so need something with a bit less grunt and a lot less current draw. I am thinking of mounting motor and compressor side by side running a small belt between them. I think that the belt option will be much easier than a direct drive secanrio.

This should give me a reasonably compact unit that could be mounted under the bonnet, or used as a portable unit.

Pesky Pete wrote:I am looking at some industrial style motors at the moment for this application. Starter motor draws far too much, so need something with a bit less grunt and a lot less current draw. I am thinking of mounting motor and compressor side by side running a small belt between them. I think that the belt option will be much easier than a direct drive secanrio.

This should give me a reasonably compact unit that could be mounted under the bonnet, or used as a portable unit.

Starter motor is not ideal for other reasons - pathetic duty cycle and poor torque at rpm. A smaller (2 horspower?) winch motor might be better but there are amny things to consider which is part of why good commercial units are so expensive - someone clever has already done the maths.

Belt drive is much easier to set up and you have the advantage of being able to change the drive ratio fairly easily by changing the pulley diameters. The down side of a belt drive is that they are relatively inefficient when compared to a direct drive. The loss will be significant especially since you've already decided on a smaller motor to draw less current.

Belt drives are better where you have "unlimited" power, eg 240V or engine driven, direct drive is far better suited to a 12V application.

To spec your motor you need to work backwards from your desired operating pressure and flow rate (eg as a benchmark start with say 3 CFM@50psi), which will give you a baseline power figure. then find out or have a stab at the efficiency of your compressor at the given pressure/flow - if you can get figure for the compressor then use them, otherwise guess around 50 - 60%. You also need to know the rpm of the compressor for your desired flow/pressure.

then you have a rpm and power figure to match yourself a motor to. Obviously you need to match these with the OUTPUT power of the motor.

If you go for a belt drive you'll need to also consider the efficiency of the drive which will be somewhere in the range 75 - 90% for the sort of power range you're talking.

an engine belt driven compressor, or shelling out for a commercial unit starts looking easier/relatively cheaper once you get into the details.

cheers

Brian

dow50r wrote:Ive seen photos a setup on a diesel 80, using the air cond belt.
Andrew

would you be able to send a copy of these pic you have seen or post them in the forum for us to view.

I would not use a starter motor for the reason that you can not run them for to long in a row as the motor will bind up the
maybe try a windscreen motor as they are yoused constant all the time