One for the gurus.

Bennie Vorster · Post by **Bennie Vorster** » Mon Nov 12, 2007 8:17 pm

I have at last solved all my motor problems.

All I needed was to take out the VW Motor and installed a out of the box Rotex 582 motor

even if it did set me back R85 000.00

Riftvalleyvw · Post by **Riftvalleyvw** » Mon Nov 12, 2007 8:20 pm

You kidding right? If you cant keep your VW motor running that rotax will be a nightmare for you.

vader · Post by **vader** » Mon Nov 12, 2007 8:55 pm

Why larry why? Take a pick of the rotax please I dont think I've seen one...

Chris · Post by **Chris** » Mon Nov 12, 2007 11:10 pm

Let me ask an uneducated question.A VW engine has a shroud in which a fan runs.The air that is generated from that runs over the engine to keep it cool.

If it doesn't have a fan shroud,but still has engine tin,doesn't the tin then keep cool air out,and warm air in?

Riftvalleyvw · Post by **Riftvalleyvw** » Mon Nov 12, 2007 11:40 pm

Huh???? I must have missed something.....

Post by **calooker** » Tue Nov 13, 2007 7:05 am

What are you doing with the VWAC motor, spares maybe, I could be interested, let me know.
Rui 082 830 6493

Post by **fig** » Tue Nov 13, 2007 2:50 pm

I see you followed my advice re the Rotax.

While ACVW engines are very simple and easy to maintain, an engine that was giving mysterious problems and possible warnings of imminent valve failure, as yours was, is not an engine that I would trust to power an aircraft.

If I had access to a scanner I could share with everyone an original VW Service Bulletin from 1955 warning against using VW engines in aircraft; it makes quite humorous reading.

Chris · Post by **Chris** » Tue Nov 13, 2007 4:41 pm

Chris wrote:Let me ask an uneducated question.A VW engine has a shroud in which a fan runs.The air that is generated from that runs over the engine to keep it cool.

If it doesn't have a fan shroud,but still has engine tin,doesn't the tin then keep cool air out,and warm air in?

I'm still asking!

Post by **Tony Z** » Tue Nov 13, 2007 4:53 pm

pretty much, but I think its a trick question

forcecooled · Post by **forcecooled** » Tue Nov 13, 2007 5:43 pm

Yelo- My 12 cents worth!
The cooling on an aero engine or VW motor is done By the airflow which results from the plane moving thru the air, and by air blown thru the motor by the prop as well . Its not just a case of plonking a kaalgat engine under the cowling and expecting the airflow to cool it - it wont happen !

When the installation is designed and fabricated special attention has to be given to creating a plenum chamber above the motor and an area of low pressure under the engine to allow the hot air to escape freely from below the motor and out of the cowling. forget me not plates are often installed under the cylinders to ensure cooling to the bottom of the cylinders.

The hot air made by the motor is also harnessed to by the means of constructing muffs wrapped around the exhaust pipe ( like small VW heat exchangers) whick will feed hot air to the carb when needed , and the cabin for heating and defrosting. These muffs are fed with high pressure air from the plenum chamber and the flow is interrupted by flap valves that are operated by levers or knobs in the cabin.

Next time you are at a small airport, have a peep under the cowling of a piper 140 or so that has hinged engine covers and you will see how it is all done --- actually really simple!!
Chaars
Bill

forcecooled · Post by **forcecooled** » Wed Nov 14, 2007 8:16 pm

Hello?

Post by **Tony Z** » Wed Nov 14, 2007 10:27 pm

forcecooled · Post by **forcecooled** » Wed Nov 14, 2007 10:52 pm

Post by **Bugger** » Wed Nov 14, 2007 10:53 pm

hi! lo

hitlers revenge · Post by **hitlers revenge** » Wed Nov 14, 2007 10:55 pm

Hi dee hi