This is just plain nuts! You are a genius, DarrylD...and I can't wait to see the MFI one!! Wow, this board and its members never cease to amaze me.


JA

Excellent work!

I love the animation, but I have a quick question.

On the left side of the engine the opening and closing of the ports are controlled by some type of actuator that is spinning counter clockwise. On this actuator there are two humps that appear to be dedicated to either the intake port or the exhaust port. Is this the way it actually occurs in the engine or am I missing something? The right side seems to occur in a logical progression, but I can't seem to figure out the left side.

I don’t want to critique your work; I am just trying to learn as much as I can.

Thanks for the education.

Under the heading of: "Isn't anything good enough for you?"
How about some animated flame/glow to go down the exhaust? It should make the pumping action very obvious.

Wayne

If your using XP, this is the way to make it animated as a desktop wallpaper.


Righ click on the pic in this post. Click on "save picture as ". Save it in your pictures folder. Now go to start, go up to your "My Pictures" and click on it. ( thats in between "My Recent Documents" and "My Music") . Now look for the pic in your folder, when you find it, right click on it, and click on "Set as Desktop Background". It should now be you Desktop background, and should be animated.

Thats all I did.

can someone host elsewhere or email it to me. Work blocks personal webpages and my DSL has been down since Friday. (earliest is Saturday for a tech) ARghhh...

911S Targa,

thanks. It was a snap following your directions and what a hoot to have this breathing (It's Alive! It's Alive!) 911 engine as my desktop.

The actuators are the camshafts. One of the problems is that the camshafts are 3D, but the drawing is only 2D. The lobes are at 2 different points of the length of the cam. I'm not sure why on the right side the cams are 180*, and on the left side they essentiall overlap, so it looks like one lobe, but it's really two. Since I don't have a cam to look at I can't say if that's 100* accurate or not, but with as much time as he's put into this it probably is.

Here's a pic. Imagine you are looking from the end.
http://www.type-911.co.uk/images/specials/cam.jpg

\
Your very welcome.SmileWavy

:D
http://forums.pelicanparts.com/uploa...1107893310.jpg

I noticed the same thing. After watching it a while it dawned on me that because of the rockers and where they interface with the cam as they spin, it might make sense that they appear different at first blush. You'd need to map them out to know for sure. But this might explain also why when looking at the cams from the end, that the lobes on the first cylinder on the left cam are aligned in an "L" while those on the right are not per BA's and Wayne's books.

Here's a little graphic from page 157 of Wayne's book, "How to Rebuild and Modify Porsche 911 Engines 1965-1989" showing the cam issue you're talking about:

http://members.aol.com/darryld/waynes.jpg

It stumped me why they were oriented as they were until somebody reminded me the intermediate shaft (the center sprockets for the cam chains) is gear driven off the crank, therefore rotates the opposite direction!

If you have a 911, you gotta buy Wayne's book, even if you never plan on doing a rebuild yourself!

One thing to notice on the animation is how the outward cam cam on one side runs the exhaust and on the other side runs the intake... the heads are interchangable from side to side so the rocker arms must accommodate the side change.

911mot,

Is that a 917 engine?

HOLY $H!T!!!!!
That is one amazing 917 pic. If someone would animate that I would totally keel over!! WOW! Please?

If Daryl or anyone took it upon themselves to animate that view of a 917 engine I think we'd end up having to hospitalize or more correctly institutionalize them. Since that view provides a 1/4 view of the cams, multiple cylinders, etc... It would be a truly momumental endeavor.

Not impossible, but crazy. Or maybe Daryl is just that good.

Darryl,
I just got a new background on my desktop, thanks so much.
It is really cool, If there is a newer version please let everyone know.. is the version on the bottom right real? Will you keep it updated?

Thanks again
-J

Darryl,

Please explain why it looks like the crankshaft and camshaft are rotating in opposite directions. Is the chain between them looped ?

I bet the answer is obvious but being an technically ignorant and new to the P-world I just can not figure it out.

Thanks,

Markus
Carrera 85

Hey Markus!

Here's a picture of the timing chain overlaid over the engine model:

http://members.aol.com/darryld/timing.jpg

You can see the intermediate shaft below the crankshaft is gear driven off the crankshaft, crank goes clockwise so the gear spins the opposite direction on the intermediate shaft. The intermediate shaft has two separate sprockets, on driving a separate chain for each camshaft, both have to rotate counter-clockwise.

Version numbers are real, and updated each time I stop playing and "put a fork in it!" It is version 1.3 now!

you know what would be really ...i mean really sweet?

all this in flash , and sections, so you can go though different cutthroughs

first , the chain pic, just above, next #1 and #4
then 2 and 5
3 and 6

all with a pic of the distributor, so you can see what stage of the timing you're currently looking at...

but it would be a hell of a job to get this done in flash, i know Swish , but Swish ain't up for such a job... and Flash is friggin difficult

Thanks Darryl,

That was a very pedagogic disclosure of my limited knowledge of combustion engines in a public forum...

Much obliged,

Markus
Carrera 85