Hi!
I need Porsche specialist for help with one at base porsche engine . Made in France, for ultralight airplane jpx 4T 60A
JPX, comany no longer exist.
I need to improve power for this engine from maximal 65 hp at 3200 rot/min (propella limitation) to 80 hp.
Now compresion is at 7.7. Please help me with calculation and proper complete rebild kit for my dream 80 hp.
I want to improve my engine with efis or injection if is at humanoid price...

For detail email me at ifcristian@yahoo.com or facebook cristi iftode

I now, is not a Porsche car, but i like Porsche.is like one little airplane.Speed, fly... scuse me for offtopic.
This is the engine:
http://www.ultraligero.net/Descargas/Manuales/JPX/4t60.htm

With hopes, Cristian

Do a Google search for Colin Lamb attorney in Portland Oregon.
He has powered glider with a Porsche Type 4 engine. Years ago he had some enhancements done. Let him know that Cary Kutter sent you.
Good Luck ...

Aircraft motors tend toward torque over HP. They don't rev very high. Make sure whoever you get to help with this, they know aircraft. In the US, the mechanic must be an Airframe Powerplant Mechanic. Not sure what your French laws on this might be.

The web page you linked here shows a type 1 or type 3 based engine, not a type 4 engine.

914s used the type 4 engine, here are a lot of good people here but there maybe better type 1 or type 3 information in a VW group. I don't know what groups are good or not.

There are lots of performance parts for type 1 & type 3 engines and in the VW automotive world 80hp is low.

Jim

Simplest way would be to change the piston/cylinder diameter to 96mm.
You might want to change compression and camshaft as well.

If you need more help, I can connect you to some of my dad old buddies at the airplane factory in Bucharest. They had a full remanufacturing line for aircraft piston engines.
There is also an helicopters factory somewhere closer to you. You might find help there as well.

Sounds dangerous, you can count me in


A type 4 in a aeroplane?


Not really sure why you would go this route

But just remember the right way to build and install and run the engine

= the way you dont die .



And a humanoid price ?

I always thought everything avaiation was expensive

By the looks of things greatplanes has stopped doing T4 engines. I do know they had some prop hub failures.

As for power aircraft engines are about torque so a longer stroke would be a first consideration. But the crank you have may be modified for a prop mount. LN nickies could be used to up the size and save a bit of weight, but they are not approved. In fact if you tell them it's for an airplane they may say no, so you would have to "wink-wink" not tell them.

SDS fuel injection got its start in homebuilt aircraft, they make FI systems for aircraft. Lots of homebuilts using SDS.
http://sdsefi.com/
I do know out of car engines they prefer subaru engines for aircraft.

None of the options I just gave you are a humaniod price

If you click on the OP's link it is a T4 engine, that's a different engine.

OP's link http://www.ultraligero.net/Descargas/Manuales/JPX/4t60.htm

Is your plane a Robin ATL?

https://en.wikipedia.org/wiki/Robin_ATL

It's been done lots of times. The carb will actually be more reliable than the Type 4's DJet or LJet. Hopefully you understand that you will need to plumb some heat from the exhaust to the carb with a diverter box that you can buy or build your own It's been years but I do remember a guy named Ken (maybe Ken Rand) that sold plans for his homebuilt. It was a Type4 turbocharged and quite. He was here in California. You need to use a rev limiter to keep the rpm's below 3400. I don't know the length of your prop but if it is close to 70"+ the tips go supersonic around 3400rpm. I'll try to find some info on it if your interested but I won't be back in the US for a couple of weeks. France has an active Home Built Aircraft community so you should have great resources there as well. Are you a member of the EAA ?(Experimental Aircraft Association) If not you should join. An absolute wealth of info there.

In the USA if you build your plane then you hold the "Repairman's Certificate" which never expires and you can do all of your own inspections and work on any part of the plane. Outside of that loophole you do need a licensed A&P, military excluded.