Thanks Veekry9! Found a 2nd edition (1972) on ebay and bought it!
and to Mark Henry, I'm still learning about the Type 4 - this is going to be a long process.
I've ordered the Bentley book as you suggested.
Wish me luck!
Full Version: Type 4 mechanical compression ratio
QUOTE(Beebo Kanelle @ Feb 14 2016, 12:14 PM) 
Thanks Veekry9! Found a 2nd edition (1972) on ebay and bought it!
and to Mark Henry, I'm still learning about the Type 4 - this is going to be a long process.
I've ordered the Bentley book as you suggested.
Wish me luck!
http://www.914world.com/bbs2/index.php?showtopic=80872
QUOTE(veekry9 @ Feb 14 2016, 03:14 AM)
Design brief:
1) air/liquid cooled hybrid
2) 3 valve
3) uses production valves.
4) meehanite-ex/bronze-int valve guides
5) pushrod activated roller tipped,rollercam
6) T4 headbolt pattern
7) canted valves
8) induction hardened seats
9) direct injection
10) dual plug
All of these details are desirable,but the pertinent question is,how many can you sell?
There are plenty of great stories of attempts and failures.
The impetus is improving on what came before,in some incremental way.
https://www.onshape.com/
https://www.tinkercad.com/
Make a cloud cad file,3d print the prototype,analyze the result,improve,cast the part,
machine 5X,assemble,prep,install,run.
All for <2K profit each set.
Hard to do isn't it?
https://www.google.ca/search?q=custom+vw+t1...wavNTQY-geuM%3A
/
http://www.apfelbeck.nl/
/
Reading through the comment sections.
However well you do making a great product or service,there will always be the naysayers.
Can't,won't,shouldn't and didn't are the words they use.
Read a book?Hell no,I can't,won't,shouldn't,didn't.
Pat them on their head in sympathy and
Send them on their way with a lollipop.
Sadly,they may procreate,great,more halfwits.
The effort they expend in negging other's labour and thought might better be used in an attempt at raising their own iq.
/
Maybe I missed it, but I didn't see him post about developing parts or engines for sale or profit.
I'm all for trying to make a decent motor better, but I wouldn't get a second mortgage on my house hoping to make something revolutionary for such a small market.
Thank you, Mueller -
I just have some ideas that I want to try - if they work, great!
Right now, I am just learning everything thing I can about the Type 4 engine. Never have been interested in air-cooled engines until now - (In fact, my original intention was to buy a 914 and put in a hi revving LS w/boxster transmission - but I fell for the Type 4 and the quirky 901 after living with it for a few years)
If anything I do works - I'm sharing it with y'all - I'm in no mood to start another business. This is for fun.
Wish me luck!
Thanks again
I just have some ideas that I want to try - if they work, great!
Right now, I am just learning everything thing I can about the Type 4 engine. Never have been interested in air-cooled engines until now - (In fact, my original intention was to buy a 914 and put in a hi revving LS w/boxster transmission - but I fell for the Type 4 and the quirky 901 after living with it for a few years)
If anything I do works - I'm sharing it with y'all - I'm in no mood to start another business. This is for fun.
Wish me luck!
Thanks again
QUOTE(Mueller @ Feb 14 2016, 04:30 PM)
Maybe I missed it, but I didn't see him post about developing parts or engines for sale or profit.
I'm all for trying to make a decent motor better, but I wouldn't get a second mortgage on my house hoping to make something revolutionary for such a small market.
I know I'm just being a ass-wipe, I guess when I see the theoretical threads then weeks, months, years go by and it's still theorising, it just increases the gravitational pull of my bunghole.
Actually you make the exact point that I'm trying to convey in your second sentence. Build the frick'in conventional engine... build the frick'in 914.... get yourself some frick'in seat time.
THEN you will be enlightened as to what the 914 is about. It will at this point inspire you to invent the type 4 fluxcapacitor. OR you will find your inner peace in the yin and yang of how the 914, for all it's faults, still makes you at one with the twisties.
That's the beauty of the freedom of free will,doing it your own way.
Every new idea has come about that way.
Thomas Edison's lightbulb,he did it by ignoring self tooting critics.
Wright brothers did it their way too.
Sikorsky was told many times to stop wasting his time.
Rickover sailed right past all the bs.
Elon Musk too is doing it his way,the sound of the bs talkers lost in the roar of the rockets.
One thing in common with all these achievers is the words can't or won't are meaningless.
So go ahead,do what you like,build your new Acme,and define your own future.
Every new idea has come about that way.
Thomas Edison's lightbulb,he did it by ignoring self tooting critics.
Wright brothers did it their way too.
Sikorsky was told many times to stop wasting his time.
Rickover sailed right past all the bs.
Elon Musk too is doing it his way,the sound of the bs talkers lost in the roar of the rockets.
One thing in common with all these achievers is the words can't or won't are meaningless.
So go ahead,do what you like,build your new Acme,and define your own future.
QUOTE(veekry9 @ Feb 15 2016, 01:27 AM)
That's the beauty of the freedom of free will,doing it your own way.
Every new idea has come about that way.
Thomas Edison's lightbulb,he did it by ignoring self tooting critics.
Wright brothers did it their way too.
Sikorsky was told many times to stop wasting his time.
Rickover sailed right past all the bs.
Elon Musk too is doing it his way,the sound of the bs talkers lost in the roar of the rockets.
One thing in common with all these achievers is the words can't or won't are meaningless.
So go ahead,do what you like,build your new Acme,and define your own future.
Yes, but all those guys didn't just think and talk about it...they did it !
BTW Edison didn't invent the light bulb, he bought the rights and his team made the first practical incandescent light bulb.
Its getting done...
maybe not on a Canadian schedule and,
Mark, I'm sorry you're having problems with your bunghole but, it will not change my methodology - I know its tough being cooped up in the winter snow & ice in Canada
Here, its neither the land of 20 hour nights nor the midnight sun here... we acutally have a life, get out an work during the winter days.
But, I am not going to just hang crap on a engine and see how long it takes to fall off -
As Mr Raby says 'Its all in the combo" - I am going to finish the design calculations and simulate them on the computer... only then will I start building
If you look at the start of this thread, I was looking for the mechanical limits of the type 4 design, as I have have zero prior experience with it.
so, be patient and, like I said, if it all blows up, so be it. but if it works, I'll gladly share everything.
Thanks to all
maybe not on a Canadian schedule and,
Mark, I'm sorry you're having problems with your bunghole but, it will not change my methodology - I know its tough being cooped up in the winter snow & ice in Canada
Here, its neither the land of 20 hour nights nor the midnight sun here... we acutally have a life, get out an work during the winter days.
But, I am not going to just hang crap on a engine and see how long it takes to fall off -
As Mr Raby says 'Its all in the combo" - I am going to finish the design calculations and simulate them on the computer... only then will I start building
If you look at the start of this thread, I was looking for the mechanical limits of the type 4 design, as I have have zero prior experience with it.
so, be patient and, like I said, if it all blows up, so be it. but if it works, I'll gladly share everything.
Thanks to all
![popcorn[1].gif](http://www.914world.com/bbs2/style_emoticons/default/popcorn[1].gif)
Please let this thread die
QUOTE(Steve Pratel @ Feb 15 2016, 12:53 PM)
![yellowsleep[1].gif](http://www.914world.com/bbs2/style_emoticons/default/yellowsleep[1].gif)
QUOTE(McMark @ Feb 12 2016, 07:50 AM)
If you're looking to improve thermodynamic efficiency, why are we talking about compression? Why are we talking about horsepower? Neither of things have any direct connection to head cooling.
You're being very cagey about what you're actually trying to do. It makes it hard to help.
The raise in power from higher cr comes from a better thermodynamic efficiency. If you would measure the exhaust gas temperature the higher cr engine will have a lower exhaust gas temperature. That is we're the extra power comes from. I guess lower exhaust gas temperatures will also affect cilinder head temperature, especially in an air cooled engine.
QUOTE(ra272 @ Feb 15 2016, 04:36 PM)
QUOTE(McMark @ Feb 12 2016, 07:50 AM)
If you're looking to improve thermodynamic efficiency, why are we talking about compression? Why are we talking about horsepower? Neither of things have any direct connection to head cooling.
You're being very cagey about what you're actually trying to do. It makes it hard to help.
The raise in power from higher cr comes from a better thermodynamic efficiency. If you would measure the exhaust gas temperature the higher cr engine will have a lower exhaust gas temperature. That is we're the extra power comes from. I guess lower exhaust gas temperatures will also affect cilinder head temperature, especially in an air cooled engine.
HA-HA McMark....it wasn't me!
Oh wait.... now it is ....Doh
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