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Old 10-09-2012, 07:28 AM   #81
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next question, where you gonna put it in?? haha

Need some holes to get the air/fuel (dust, etc!) in,
and also to let the flames out!



Last edited by hi speed scrap; 10-09-2012 at 08:08 AM. Reason: posted too soon
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Old 10-10-2012, 01:25 AM   #82
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Hi Herbie,
Sorry for the delay but I was flying yesterday.
Anyway here is what I came up with I hope it is what you are looking for.
With the push rod support info, from what I can see all the required info is there?
About the only info that isn't there is how to attach it so I presume it was ment tto be soldered on.
As for Mikes post #77, this is the reason why I made the offer back on post #30.
I find that about 90% of the older plans (pre CAD ) tend to have errors in them and even some of those done in 2D CAD can have errors.
After all computers are only as good as what we punch into them.


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Old 10-10-2012, 01:32 AM   #83
hi speed scrap
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Hi Ausdier
did you resize the valve to get it to fit into the transfer port?
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Old 10-10-2012, 01:57 AM   #84
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Hi Dave.
Short answer is no, this is one of the areas where things didn't workout properly (valve 6.5 dia port 6 dia ) So if people wanted to sort out the plans I would have asked how people wanted to go in this area.
The same as the inlet side as there is no info about carby or anything.
This is where I was going to rely on everyones experiance and if some one couls supply information on what might work I would scale it if nessesary and then do workshop drawings for all.
This can still happen if people want as it would be a shame if this project stopped and parts that had been made were either scrapped (shelved) or had to be remade.
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Old 10-10-2012, 02:21 AM   #85
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Hi Ausdier,
Thats ok, I will draw up something feasible for discussion in the next day or
so and put it on here.
Should we also look at the compression ratio, that is rather low in my opinion
other team members probably know better than me if it will be enough.
My calcs show less than 4 to 1.

Now that we are redesigning the engine should we watermark/copywrite
drawings etc? (redesigned for Australian conditions )

As you say, would be a shame to drop the project.

Dave
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Old 10-10-2012, 05:47 AM   #86
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meanwhile, experimental plug #1, teflon insulator and stainless electrode. Might be next week before I can test it and move forward, town day tomorrow and heading down to Batemans for the weekend Fri.
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Old 10-10-2012, 03:50 PM   #87
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Quote:
Originally Posted by ausdier View Post
Hi Herbie,
As for Mikes post #77, this is the reason why I made the offer back on post #30.
I find that about 90% of the older plans (pre CAD ) tend to have errors in them and even some of those done in 2D CAD can have errors.
After all computers are only as good as what we punch into them.
Hi Ausdier,

that's what I found out too. And even 3D models can have errors, they are easier to find in 3D, but only took a closer look.

During last weekend I've tried to draw the David Kerzel Engine in 3D as preparation for a metrification.
I'll make a separate thread on the problems I found in the first blueprints of the plan set.

Mike
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Old 10-10-2012, 09:29 PM   #88
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Thanks Ausdier. The info on the pushrod support is there as you say. Just a bit hidden for a newbie. This CAD stuff seems great. Where is a good starting point to learn ?
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Old 10-11-2012, 02:27 AM   #89
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Hi Herbie,
Starting in CAD, you can go many ways.
You need to decide if you want to use a more mainstream CAD package like Soliddworks or if you want to try one of the many freebe versions out on the web.
If you pick a freeby you will have to learn what everything does through trial and error or by reading the help files and asking a lot of questions on line.
If you know someone close who already knows and uses CAD they may be able to help you in a few ways.
Or you can go to TAFE or TECH whatever it is called and learn Inventor, which is another more main stream CAD.
However whichever way you eventually go you will find it so helpfull in every aspect.
I use either Inventor Pro 2012 or Solidworks Pro 2012 myself, as well as Mastercam X5, for my CAM work and Mach 3 for when I eventually get one of my mills converted to CNC.
I know this may not be all that much help but there are a million different views and everyone has their own opinion.
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Old 10-11-2012, 03:25 AM   #90
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FWIW Herbie, I went to Tech and did AutoCAD which is way too expensive for home use. So I used TurboCAD to do 2D drawings. I didn't try 3D because I thought it was too hard.

Then John Stevenson from NZ introduced me to Alibre 3D as the simplest way to make 2D drawings. It is really easy to make the 3D parts and then you just tell the program to draw it in 2D - and you choose any or all of front, back, right, left, top, bottom and four isometrics. The dimensions are all there. And if you change the 3D model, the 2D drawing changes automatically.

You create each part and then put them together in the assembly. For engines, you can then turn the crankshaft and watch the piston move and even see where it goes (measure clearances etc). And change the colour of the parts to see what it will look like (if that's your bag).

You can print the drawings as .pdf if you wish and you can include .jpegs in the drawings as well.

It took no time at all to learn to use it and there are heaps of really good tutorials. You can even Google something you want to do and usually find the answer.

You can download the full version for 30 day trial for FREE and the Personal Edition (which is what I use) is only about $200.

Why not give it a go. You have nothing to lose (and I have nothing to gain, I am just a satisfied user).

Jim


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