Kristijan showed some improvement with the comp ratio?
One stupid question before I try to sleep.
Is it possible to have the turning direction the other way around? And what should be modified? Camshaft, any others? Did someone do this?
Sorry, stupid question but I cant get it out of my head.
Joep,
It is possible to run many engines backwards. You must change the valve timing. I don’t know how to reverse the electric starter.
Rindert
Thanks, someone switched the in outlet valves. Another option. Just curious if someone ever did this.
In years past (last Millenium) I did a fair number of electric starters reversing.
On wound fields coil type it is matter of reversing the the fixed poles polarity. Either change out the field coil windings for reverse wound if available; or just reverse the field coil ends to reverse the current flow.
Some of the early PM magnet types of Bosch and Delco’s had non-glued in loose PM magnets. Swap them around.
Most of the work was on starter motors for use as reversable winching motors.
The true winch motors had isolated wound fields with external feed posts. The PM types you were reversing the current flow through the armature to reverse the armature N’s and P’s.
Devilish details for actual engines starters.
Most starters designed for optimized power have the brushed holder biased to compensate for rotational induced fields distortion. Like fan blades are angle biased. You lose ~20% power once reversed.
The engagement drive will be backwards. Drive will clutch backwards. Teeth edges sloped entry ground on the wrong sides then too.
And some armature shafts/drive sliding shafts have shallow splines to help ease for gears engagements.
Motors O.K. reversed. Will not flywheel hook up. Or drive the engine.
So doing this becomes a M-A-Y-B-E. Could be. Do NOT reverse the engine until you have a solid starting solution proven.
Steve Unruh
SteveU. Opinion please. Other than hydraulic is there a cost effective motor that could be swapped into a 12000 lb winch that would significantly increase it’s duty cycle? I have one with a burned out motor. Guess why.
Not really a longer duty cycle substitute motor TomH.
An actual continues duty cycle motor in that power would be 3-4 times in diameter and have flow through air cooling.
Not possible weather front mounted.
The rule of thumb is hand touching the in-use motor housing frequently. Once past no longer keep a hand on it longer then 15 seconds. Shut it down and wait to cool off.
Your white Guess why “coolant” can be packed a bit around the motor housing to speed cool some.
Will not cool the armature and bushes/holders. The highest temperature areas.
These winches are for short term recovery-use NOT as the sellers say: Logging.
Yes. Go hydraulic for long useage.
Steve Unruh
Hi Joep,
Besides me not getting the benefit rather the fun to try it…
The compression stroke is aligned in favor , not dead center of the cranck shaft.
So , if you have the reversed rotation, you also have the “double” disadvantage…
Engines are designed to work in one rotational direction, a lot of engineering went into that.
most cam’s/gears have specific offsets, so, besides the fun of trying, not so much visible benefit…
Koen, thanks, another thing to reccon with. Just read something somewhere. An engine with two crankshaft turning in opposite direction and as a result almost no vibrations. Maybe, some day. First things first.
Thanks
I’ve been working on a flywheel/pulley part to allow these engines to run smoothly under power at 1800 rpm for longevity.
Kind of a different goal than most, but the lower RPM would also help with complete combustion using slow flame front gases.
It’s a Geo Metro flywheel with a ‘H’ tapered bushing hub to mount it. It it wide enough next to the ring gear to either crown or machine grooves for the standard micro groove serpentine belt.
It’s almost 10" in diameter (can’t remember how heavy).
Here is an interesting table (maybe already around here and I missed it).
To the inexperienced builder that chart should be titled how to kill the Honda gx engine 
good information if you know what your looking at that is for sure
Your skirting the edges of the operating envelope for these engines at 1800 rpm.
I am concerned you may not splash enough oil for effective lubrication.
I do admire your machine work!!!
One stupid question deserves another - Why ???
Jeff
Haha, for elimination of vibration. If one turn the oposite directions there is no resultante.
You got me. I don’t understand why reversing engine rotation would reduce vibration. Maybe there is more to the story? Maybe the application?
Jeff
Like a boxer. Saw something somewhere, just thinking out lout. Crankshaft and pistons move in oposite direction, so no vibrations in that direction.
The big block engines in this family usually come with a counter rotating shaft to dampen the vibration so they are very smooth running.
But they are also very smooth without it.
I had a few more recent they followed me home engines.
The Wisconsin is a real find.
Its a naturally slow turning long stroke, long rod engine.
Features that make it good for woodgas but the compression is very hard to do anything about.
The Snowblowers have a couple of big engines one is a Honda clone GX 270 ( over bored to 288 I think ) the other an old tired flat head but it been serving me well this year.
I have been looking online half hearted for a crank to put in the Honda clone snowblower and bolt that to a MeccAlt 4000 watt head.
That would be an interesting wood gas conversion.
Between the milk crate and the lawn mower is a Champion generator I was considering converting to charcoal and using a pumped up 208 off the snow blower to power it.
In conclusion there are parts all over the place this year.
Now that lock downs are ending people seem to be throwing everything out and buying new stuff.
Might have been one of these from another thread.
OTC Onans are all around us if you look for them.
Aadvantages large size naturaly slow turning easy to work and if tarred up
Two times no.
It was some special CHP engine. Great idea. But for me first thing first.
And no, Onans are very rare on this site of the pond. Looked for them since you all work with it. Only one hit on the market place. Spareparts will be a problem.
Honda clones you can find anywhere on this globe:grin:
