not a 500, but big bore and long stroke

[Roostius_Maximus]

This is from an old Rumley tractor, 1916-1920something era
We sleeved the block to fit johndeere G pistons which are very close to the non existant rumley parts. Decking the block shows how good these parts were built/machined. i'm cutting .004"off the base of the cylinder to clean it up, here is a picture with .002"off it. its siting on the deck which hasnt had any work either. look at how strait the parts were machined! a work of friggin art, NEVER does anything after 1960 showup as nice as this.

[AlisoBob]

This is Vintage V-12's.... They do alot of WWII warbird engine shit....

http://www.vintagev12s.com/home.htm


Fighter Rebuilders in Chino brought them one of these....



Daimler-Benz DB 605A-1

Its a inverted V-12. Fuel injection, dry sump lubrication, the supercharger was fairly advanced for the era, it used a barometrically controlled hydraulic clutch (fluid coupling) which allowed the system to automatically compensate for changes in altitude.It was good for about 1,975 horsepower. It came in the Me-109 fighter.

Vintage V-12's was given the task of taking it apart, and making it "right"

Mike Nixon of Vintage V-12's called after about a week.... "Come and get it".

"Your done?"

"Yea"

"That was quick!!!"

"Never touched it, only measured it. It we did touch it, it would screw things up"

"Its that good?"

" Yea... its that good"



Mind you this was designed in the late 1930's, and manufactured in caves while we bombed the crap out of the german factories.

Its an incredible engine.

[britincali]

I never understood how oil dint pool in the pistons on inverted motors....

[2strokeforever]

I never understood how oil dint pool in the pistons on inverted motors....

thats why they move up and down

[britincali]

Would still pool on the underside of the crown on a regualr style piston....

[MojoScojo]

Inertia would take care of that mighty quick.

Take a bucket of water and shake it up and down really fast...

[AlisoBob]

Daimler-Benz DB 605A-1

Its a inverted V-12. Fuel injection, dry sump lubrication...

There is no oil in the crankcase. No oil, no pools...

[britincali]

There has to be oil sprayed on the underside of the pistons and bore tho........

[kdizzle]

Daimler-Benz DB 605A-1

Its a inverted V-12. Fuel injection, dry sump lubrication...

There is no oil in the crankcase. No oil, no pools...

Id like to hear that SOB running in the flesh !! BADASS

[dannygraves]

yup, they really don't make shit like they used to

[M.F.D.B.]

WITHOUT cheating (Google) do any of you know why the motor is built "upside down"?

[2strokeforever]

so the pilot isnt trying to see between valve covers?

[bearorso]

Any number of reasons - weight distribution, Crank / other spinning assembly influences, centre of gravity of engine and whole aircraft / lowering centre of pressure with regards to aerodynamics when combined with all other aspects of flight dynamics etc, etc , etc. Flight engineering is a fascinating thing that I've unfortunately had little to do with. I've a few flight engineers / pilots as friends, and find their take on things endlessly fascinating, and much of it is well above my math / engineering levels .

It could be as simple as allowing the pilot a better line of sight, with much less fuselage / nose in front of him. That alone could give a pilot a critical advantage.

[M.F.D.B.]

Germans figured that if the oiling system was damaged by enemy fire that the valve train would retain lubrication the longest since it needed oil more than the bottom end. Its basically a way to buy time for the pilot to get the plane down using gravity to bring every last drop of oil to the most fragile part of the engine...

[AlisoBob]

Not exactly.... With all the con rods galloping on the underside of the engine ike in the Merlin, 1 single well placed ground fire shot starts a chain reaction of instant failure.

With all that junk on the topside, its well protected.

If you get a hole shot in the valve cover, big deal... its dry sumped anyways. Get a rocker or two blown off.... no biggie, the engine is still running.

It was an attempt to "armor" the engine, without adding weight.

The redistrbution of weight and aero advantages that bearorso posted were icing on the cake.

[lewisclan]

I sure do love checken out this cool shit on this site

[M.F.D.B.]

Well I remember SPECIFICALLY it was an oiling thing. How would it "armor" the engine when bullets come from every angle?

[AlisoBob]

I talked to my friend Anthony who knows the guys at Vintage V-12. He said that while protecting the reciprocating assembly and improving weight distribution were part of the overall plan, the real reason was much , much simpler...

"You could service every part of the engine without using ladders Bob...."



Freakin' Germans....

He also said lubrication had nothing to do with it....

[M.F.D.B.]

Thats weird, cuz "Wings of the Luftwaffe" on Discovery is usually pretty reliable...

[AlisoBob]

You said you read it, you edited it, and now its something you saw from the discovery channel?

I dont care what motor it is.... main bearings need oil much more than the cam followers.

Its a dry sump, the valve covers were always being sucked dry. Theres no "oil bath" effect.

The Benz did have roller rod bearings BTW....

I believe my buddies... the Germans were very practicle.

[2strokeforever]

main bearings need oil much more than the cam followers

X200

[M.F.D.B.]

You said you read it, you edited it, and now its something you saw from the discovery channel?

Yes, I realized my error and corrected it, so what?

I dont care what motor it is.... main bearings need oil much more than the cam followers.

Not really, especially if they are roller. Ive seen motors with multiple spun main and rod bearings run quite a while. Just ask my mom...

How long have you seen a motor run with burnt up/stuck valve train?

We are talking the amount of time it takes to make a safe landing, not much time when you are flying over your home country eh?

Its a dry sump, the valve covers were always being sucked dry. Theres no "oil bath" effect.

When the oil has left the dry sump and the only oil left in the motor is reciprocating droplets, where does gravity take it?

The Benz did have roller rod bearings BTW....

Cool, means less need for oil...

I believe my buddies... the Germans were very practicle.

Indeed...

[dannygraves]

whenever I have experienced an oiling problem on an engine, spun bearings were the first failure. I know a motor will still run with spun bearings, but it will also still run with a dry valvetrain...

[dannygraves]

I would imagine cooling could have something to do with it too, while keeping better visibilty for the pilot. its easy to run air in the front and out the bottom.

[M.F.D.B.]

Im not sure if they had piston squirters but I do know that 4 strokes with piston squirters usually trash the valve train before the bottom end when lube is taken away (like when a Honda pops a right side main seal and pumps the oil in the trans). What little oil is in the motor goes to the mains first and the squirters, when there isnt enough oil to get to the valve train is short circuits back to the bottom through the squirter...