A shameless image thread for the enginephiles

[Big Tea]

Twin plug, but only 6 nipples on the distributor?(mag)

Twin distributor just missing the second cap. You can see the where the rotor sits in the second body so twin spark.

Now that you point it out its so obvious. I feel a prat now

[strad]

thanks subcritical71;
I figured there had to be at least one but couldn't find it. As I understand it there were Stutz and a couple of others.
I figured Miller probably played with one as well.
BTW the reason the Pierce Arrow had dual plugs was to make it easier to start on cold mornings and at hand crank speeds.

[roon]

[roon]

In the video above, how can there be such a delay between the end of hand-cranking, and the first cylinders firing? Almost two seconds pass.

[Tommy Cookers]

In the video above, how can there be such a delay between the end of hand-cranking, and the first cylinders firing? Almost two seconds pass.

the ignition is off or effectively off during cranking
after cranking the ignition is on or effectively on and the engine fires and self-starts
a magneto is effectively off if rotation is slow enough
but effectively on ie will spark if subsequently the ignition (timing control) lever is quickly moved from retard to advance
this was possible with conventional ignition systems of those times before starter motors (Napier drivers can do this)
(did they have a mechanical flipping device working on the magneto? as was used on large eg aircraft engines)

other clever devices like electric tremblers working the primary windings of the magneto were often used for this

note to self -
yes Nuffield in Britain did make from scratch in WW2 Liberty engines for tanks
pressing and drawing of sheet steel parts for fabricated cylinders/heads was a factor

[roon]

A Lanz tractor displaying it`s unique ability to continue running despite not completing a full crankshaft rotation. The Lanz`s two stroke engine uses plunger actuated indirect injection into a hot bulb, crankcase pre compression and piston ported cross flow induction and exhaust allowing it to not only run backward, but also at zero RPM`s. This state is not able to maintain itself for long periods as the small amount of fuel used is insufficient to keep the hot bulb at the temperature required to continue igniting the fuel and it will eventually stop.

In the video above, how can there be such a delay between the end of hand-cranking, and the first cylinders firing? Almost two seconds pass.

after cranking the ignition is on or effectively on and the engine fires and self-starts

Crankshaft speed can be zero for this?

[J.A.W.]

Roon, those mighty recips had a fair degree of inertia, & low comp ratios/valve activated de-compression..
..some also had 'inertia starters' - from a pre-cranked over.. de-clutched flywheel..

[Tommy Cookers]

In the video above, how can there be such a delay between the end of hand-cranking, and the first cylinders firing? Almost two seconds pass.

after cranking the ignition is on or effectively on and the engine fires and self-starts

Crankshaft speed can be zero for this?

yes
this was done eg on the 1900s Napier 6 cylinder by car owners (ok maybe not possible on a 4 cyl ??)
crank the engine on the handle to prime, promptly put the handle away, then flip the ignition timing lever
presumably at least one cylinder was full of freshly squeezed mixture warm enough to ignite when sparked
(though early fuel anyway had a low bp more like lighter fuel)

certainly in those days there were trembler coils (presumably causing a secondary to produce a train of untimed sparks)
my Meteor (NA Merlin ex-tank) started with iirc such a coil (ex-Sherman) across the primary of one of the magnetos
at a very low cranking rpm from the electric starter that had a huge reduction
iirc sparks were visible without any cranking

regarding inertia starters eg
P&W Wasp 1340 in a Harvard the (integral ie plane's battery) inertia starter runs its flywheel over 5 minutes up to scream rpm
then the front seat occupant stands on a very hefty foot pedal to engage the starter and the prop starts to move etc
presumably these magnetos have no impulse mechanism or other aid
engines being stopped by fuel cutting, aviation is almost obsessive over mags being off thereafter

[flynfrog]

The old chauffeurs trick was to cut the spark while coasting to a stop to put some fuel and air in the cylinders then when it was time to start the car they would ramp the timing back in and light the engine off. No need to get out in the rain and crank. Or so the old guy at the car show told me....

[roon]

[roon]

[roon]

Turbocharged wankel with permanent exhaust bypass and manual wastegate actuation.

https://woelfle-engineering.com/we/Wank ... _Lamar.pdf

[roon]

[iichel]

Porsche's trackday toy









bonus: front bulkhead


source: https://www.facebook.com/groups/1857444 ... &__tn__=-R

[roon]

Still wonder why there's three pipes connecting the airbox to the shroud around the compressor. The outer two pipes are smaller than the center pipe. Thoughts? Might say cooling, BOV, or even a dual entry two-sided impeller. Think: one pipe to the front side as normal, and two pipes leading to the rear half. Triple entry, two-sided impeller.