A 6 Stroke Engine?

[Jerry_Atrick]

 

[Grumpy Old Nasho]

Very clever design - more power for your Cessna

[onetrack]

The sheer complexity of the design is what will make it a commercial failure. Plus, Porsche has few engine laurels to rest on, they've built a lot of crap engines.

 

If they were any good, they'd still be powering aircraft - and if you search out "Porsche engine problems", you'll find a raft of horror stories from Porsche owners.

[Grumpy Old Nasho]

Didn't know about the engine problems. My dad fitted one to his Kombi Microbus and could nearly do wheel stands, it was that powerful.

[facthunter]

Thats because the engine hangs out the back, behind the axle. 

   On another note.   Look up "Porsche racing achievements"  There's a lot on it's remarkable History.  Nev

[onetrack]

Yeah, and look up "Porsche aircraft engines problems" and get a handle on their track record there. Aircraft owners and Mooney couldn't get rid of them fast enough - horribly expensive, high maintenance, and they only sold 41 aircraft engines in total.

Plus, the Texan aviation engineers told Porsche engineers they would have massive cooling problems and the Porsche engineers told the Texan engineers they had no idea what they were talking about. Talk about massive German arrogance.

 

Edited Monday at 01:10 AM by onetrack

[Grumpy Old Nasho]

Here's a twist for youse. The straight 8 flat head engine in the 1939/40 Studebaker was designed by Lycoming. A beautifully smooth running nine main bearing engine with plenty of power. I had a 39 I was doing up but my dad sold it behind my back while I doing the two years conscription. I was really grumpy about that, I never forgave him, he thought he was doing me a favor by getting rid of it. He gave me $10 when I was home on leave. It's worth $25-30k now, and I know who's got it, unfortunately it's just not me.

[facthunter]

A lot of people have failed in the Aero engine arena,  GON a straight 8 is a dud design as the crankshaft is far too long and they flex.   The bloke who started Lycoming wasn't a particularly pleasant Person. Nev 

[Grumpy Old Nasho]

Lycoming wasn't silly, they shortened the crankshaft and brought the cylinders closer together. The engine was not much longer than a Chevy six and about the same length as the biggest flat head sixes.

[facthunter]

yeah Just heaps of bearings doesn't help. Can actually make it worse..  The very early Lycoming flat 4's had 2 main bearings.   Nev

[Grumpy Old Nasho]

4 hours ago, facthunter said:

yeah Just heaps of bearings doesn't help. Can actually make it worse

Not sure how. Nine bearings kept the crankshaft very steady, the engine ran as smooth as a Rolls.

[facthunter]

It makes it longer  (If you stretched it all out) and more likely to develop torsional harmonics at certain  (Higher) revs. You don't feel those. but it can break things Nev

[Grumpy Old Nasho]

1 hour ago, facthunter said:

It makes it longer  (If you stretched it all out) and more likely to develop torsional harmonics at certain  (Higher) revs. You don't feel those. but it can break things Nev

It wasn't a Datona speedway car. It was a comfortable sedan for taking my GF out in, once I finished doing it up.

[facthunter]

People don't build those long shaft engines anymore. They are a bad design, Go V8 mate.  prewar Cadillac or La Salle.   Nev

[Grumpy Old Nasho]

The Lycoming Studebaker engine looked very much like this Chrysler Spitfire straight 8. In those days the flat heads all looked the same, just that some were more compact than others. There was a modern straight 8, I just can't find it now but If I recall correctly, it was rear engine east-west in an Italian sports car, or racing car.

 

https://silodrome.com/spitfire-straight-8-engine/

[facthunter]

Just a bit above 30 HP/Litre at best and they are great exhaust vale seat crackers all of them. The latter part of the article tells it all.. Nev