Before I Port my Z I will prove it on a 4 cylinder first

[Mr Camouflage]

something is retarded

[ncz]

Good one CraigLOL For all the grief we give smokingwheels, I do believe he is earnest in what he is working on, just don't what that is exactly. Will have to say it is entertaining!!

[ZSaint]

I tuned out when he talked about thin valves flowing better then the 3-angle thick valves. (Can you say "vortex effect") Then he said he was working on a "stock" engine and turning it 8000 rpm's. I lost interest after these two statements. He may be interested in some horsepower you can get by putting a magic symbol around your neck. It's a magic triangle. I think it is also supposed to take strokes off your golf game. It's magic!

[240ZX]

I just could not resist the urge to post a comment about this thread. From what I gather from reading this thread, the poor guy just needs some attention! Funny as it may be, if we look back in history, there have been some pretty strange people who have made some pretty strange claims! Some of those people, as it turns out, actually made a reasonably good contribution to society. On the other hand, there are by far more stange people who are nothing but.....you guessed it, STRANGE! So, maybe in another 20 years or so we might read about our buddy here making some discovery regarding internal combustion engine performance. OK, maybe I'm being a bit too optimistic :stupid: Anyway, enough said.....see ya!

[Tommo560]

I've got a petrol remote controlled car that the motor does 30,000 rpm, and if you muffle the noise enough it would probably sound similar to that.

Tom.

[smokingwheels]

A comparson of 3 engines and there timing curves

Stock one comp 9.4:1

Previous one 8.5:1

Current one 10.5:1

not listed high comp 11.5:1

Interesting any one yet?

ok

test subjects needed...

Who is willing to machine a golf ball pattern on all there valve faces?

well just have to make it slightly different...to a golf ball...

you need a ~6 mm round router bit and a plunge router...

and a fancy clamp setup still under construction......

my first attempt cut loose over the valve seat after 20 or so dimples.

Ive done primative flow tests "slightly better. 0.5mm to 2mm lift"

Its about ~1.3 % better under primitave static flow

Have a look at valve layout81..

cheers

[Mr Camouflage]

Your previous posts about your revolutionary engine modifications were based on ATDC, was that a complete failure?

[ZSaint]

I am guessing that the drag race boys would have thought of this "flow technigue" years ago. I do know they use the aircraft flow tricks on their car bodies. The dimples on a golf ball are there to help keep a lightweight sphere in the air longer. I am wondering how this relates to a valve and volumetric efficiency?

[Aussie Zed]

Dimples on a golf ball make the boundary layer of flow turbulent - as you might guess. This gives the boundary layer more energy allowing it to stay attached to the ball for longer giving the ball a smaller wake and thus a lower pressure or 'form' drag. This effect would not apply to a valve because the flow is always going to separate at the edge of the valve and would probably increase the drag (Read: reduce the flow) due to the increased skin friction that would occur.

[smokingwheels]

Your previous posts about your revolutionary engine modifications were based on ATDC, was that a complete failure?

yes it did fail the con rod bearings,

then i lowered the compression and did a patch up job used 20" an 30" shells, it still lasted for 9 months after that,gave me time to design and test my basic program running on a laptop.

Is it true that if you advance a std engine say 25-30 deg. on top of normal, it will start to knock with gentle acceleration?

I had a head that would knock at and above 3000rpm with gentle acceleration and the only way to stop the knocking was to cut the timing back to 3-4 deg btdc,

thus this engine would need retarding further under load,

a typical figure would be .3 deg per 1kpa but i agree it would be very different running on the other side.

So now ive build a mild version of it and below 900 rpm it needs to be fired atdc eg 0@1000 ,-5@600 the stop any knocking from happing when its up to normal temp and its not a really cold morning.

[smokingwheels]

I am guessing that the drag race boys would have thought of this "flow technigue" years ago. I do know they use the aircraft flow tricks on their car bodies. The dimples on a golf ball are there to help keep a lightweight sphere in the air longer. I am wondering how this relates to a valve and volumetric efficiency?

The Valves is another idear but it will take me some time to test it,

so am giving you guys something to play with, if it works ok, if it doesnt you can abuse me for as long as you like ok.

Volumetric effciency a rough test.

Time how long it takes to fill a large garbage bag from your exhaust pipe

say at idle.

My worked engine at say ~850 to 900 rpm can do it in 5-6 seconds

I used my other stocker at similar speeds and it took 11-12 seconds.

So at low rpm does it mean I have an increased flow by 100% roughly???

My worked one the exhaust pulses on a still day can be felt up to 2 Metres away from the end of the tailpipe.

the system is stock too.

I have unbolted the pipe from the front of the second muffler and gone for a drive.... I will have to record it soon though, it really move more fumes too.

[smokingwheels]

Dimples on a golf ball make the boundary layer of flow turbulent - as you might guess. This gives the boundary layer more energy allowing it to stay attached to the ball for longer giving the ball a smaller wake and thus a lower pressure or 'form' drag. This effect would not apply to a valve because the flow is always going to separate at the edge of the valve and would probably increase the drag (Read: reduce the flow) due to the increased skin friction that would occur.

Im open to idears, I know the golf ball is not the same as a valve.

adding fuel changes things too.

A smaller wake reduces seperation is this desirable over the edge of the valve?

My primitave tests show about 2.95 % decrease in suction head at low lifts and at low flows.

Who knows what happens when full velocity and acceleration are introduced with engine speed.

http://wings.avkids.com/Book/Sports/instructor/golf-01.html

"The majority of the drag comes from the separation of the flow behind the ball and is known as pressure drag due to separation"

http://www.msu.edu/~ormisto2/

"During turbulent flow, the boundary layer of air can cling to the ball for a longer period of time. This creates a smaller area of separation, and less drag"