MH's ideal coil and voltage question

[minnie]

Don't ya just have to love the old poynt?

[Grumage]

Dear MileHigh.

For some strange reason I still cannot " quote reply " it comes back with page unavailable.

I wasn't actually referring to car engines but more to the " Stationary " engine side where the fixed RPM creates a fixed frequency. By tuning the exhaust pipe correctly the expanding gasses can actually scavenge the combustion chamber reducing the effort required on the intake side.

I have attached a couple of references to exhaust tuning and I got a surprise to read that Ferrari are employing tuned extractor manifolds on their V 10 engine.

http://www.endtuning.com/exhaustsystems/

https://en.wikipedia.org/wiki/Tuned_exhaust

Cheers Grum.

[ramset]

Grum
Don't confuse Miles with FACTS ...his mind is already made up...

Just one small example  from the resonance propaganda page you linked to

Snip


The exhaust pipes can be thought of like an Organ pipe. For each diameter and length, there is a resonant frequency, in the same way Organ pipes are different sizes and diameters to produce different notes.
Exhaust tuning uses this resonance to help evacuate the gasses from the cylinders.
This is the main point.
A finely tuned exhaust not only reduces the back pressure to minimal levels, it can actually pull the gasses out of the cylinders!
When correctly designed, the exhaust can be tuned to resonate and the pressure vibrations in the exhaust can be timed to have a low pressure wave arrive at an exhaust valve as it opens, pulling the gasses out. This tuning isn't something you can easily modify without advanced modeling of fluid dynamics but many performance systems are set up with this in mind.

--------------
Some lessons just take time to sink in...
no matter how much we hold our breathe and Shake our heads No,No No...

[MileHigh]

Grum
Don't confuse Miles with FACTS ...his mind is already made up...

Chet, I have some advice for you:  Stop acting like a jackass.

[Pirate88179]

https://www.youtube.com/watch?v=Tr21QKE8Ui0

No resonance as of yet but..it is a 4 stroke and I am still working on it.  My neighbors don't give a damn about resonance, they think this is loud for some reason, ha ha. (It is)  I am adding another muffler system soon....I went from 100 mpg to over 110 mpg.  Not too bad.

Bill