So much for thinking that modern engines are more complex! It is no wonder early aircraft engines were so failure prone.
My rotary valve idea was simply a single perfectly solid shaft, overhead, that rotates in the head. This shaft would have holes clear through it like in a ball valve and be rotating using some type of timing set just like a camshaft. I think it would have to rotate at 1/4 the speed of the engine instead of 1/2 as in a camshaft due to the holes going completely through the shaft. When the holes line up with a port in the head, the valve is open just like in a ball valve.
This seems about as mechanically simple as it gets but I can think of two possible problems with this.
Due to the need to lubricate the entire shaft and sealing surface, oil would have to enter the combustion chamber and be burned. This probably wouldn’t meet modern emissions standards. As you mention, the speeds and stresses are far higher than in a musical instrument so lubrication would be important just as with a camshaft.
It might not be able to pass the amount of airflow needed for decent power and efficiency. You could have multiple overhead shafts to account for this just like multiple cams and valves but obviously there are reasons we use the poppet style valves instead of this setup.
It looks like advances in metallurgy to harden the valves and seats made sleeve valves obsolete.
True. Compression was a lot lower back in the time these valves were in style. Sealing was one of the downfalls of Wankel rotary engines as well as oil burning/emissions.
Ball valves seem to form a nice tight seal but again they aren’t opening and closing thousands of times a minute at a high rate of speed. Any wear in the bore would allow them to leak.
This is only for motors that have just been overhauled or rebuilt and only for the first 600 miles. It has an abrasive in it to help the parts seat to each other,
OK , since we are off topic anyway it is my understanding that it takes more than one person flagging to have a post hidden . Unlike the last version of this forum the flagger is anonymous.
I think the Flag is useful but I also think their are 3 or 4 people who just flag because they can .
Pretty slow here today, but it wasn’t me that flagged It. Might have been the computer generated voice though or the whining about the public not beating a path to a better mouse trap. Might have been seen as spam.
I watched the multi-gear-vdo, thought it pretty interesting. Don’t see it now, so guess it was flagged and removed. Don’t know why. Doubt that it provides much in the way of useful info to repair a Corolla or truck in any event. But an interesting mechanical vdo , even if off-topic, seems like it should be ok to post w/out complaint. Tom (of Tom and Ray) would frequently introduce topics into their radio show content not car related at all. Like when he essayed about not being allowed to order an egg sandwich at a restaurant. He was forced to order a fried egg special and a hamburger instead , make the egg sandwich from that, completely off topic, but still interesting and adding some humor. I think he said his egg sandwich cost $16 … lol …
For the life of me I don’t understand why motor oil made from perhistoric fossils or synththetic olil made from prehistoric dino gasses should be such an issue?
They’re both the product of distillation and while dino oil may contain minimal unwanted byproducts if you’re doing minimal oil changes is there really a significant lubrication difference?
My 1952 MG has been living with factory mandated regular 30w oil changes, then 10-30 oil changes and most recently 20-40 synthetic oil changes with no loss of compression or wear for 70 years.
My point is that regardless of the source of your oil or the brand of your oil ,regular changes in clean is much more important. At a minimum change your oli at the the manufacturer’s specs. and if you even suspect that your vehicle has reached “hard usage” and may be contaminated, change it anyway.
If you wouldn’t wash your clothes in dirty water, why would you wash your engine in dirty oil?
Ha ha. When we were doing business with Bell, we talked about who that lady was that gave all the responses on the phone. Someone actually knew her name. This guy though is the same one that announces who is calling when the phone rings. Whoever it is really garbles the names. This guy wasn’t that bad but same voice.
I think I got the car polish ad confused with another video.
I didn’t see anything wrong with the animation. I hope this one doesn’t get me flagged.
