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Old 11-04-2012, 07:05 AM   #111
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I am a complete newbie to I.C engines but your drawings look sure help me understand how this one works. To me it looks perfect.


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Old 11-04-2012, 10:45 AM   #112
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Thats interesting, certainly solves the compression and residual gases problem we were
facing, perhaps a roller cam follower with a small spring holding the follower against the
cam might be worth considering, as the exhaust valve spring is not very strong and may be
affected by the weight of the rocker lever.
But. then I guess we could just fit a stronger spring to the exhaust valve.
Got a plan for Ex valve adjustment?

Does this now make it an Australian design?

Dave.


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Old 11-04-2012, 11:10 AM   #113
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Quote:
Originally Posted by Herbiev View Post
P. S. Anyone know what drills they use for drilling out spot welds?
Hello,

usually welds can be machined with HSS if You use the basic welding materials (sticks, wire), though there are several sticks/wire qualities around that are designed to give a hard welded upon surface thats wear resistant and can only get machined with grinder.

Another issue for machinability is that the steel of the parts is a steel quality suited for welding with low carbon content.
With high carbon steel, the rapid cooling of the weld will cause hardening of the material. Besides this, steel with more than 0,2% carbon tends to develop cracks during welding and its better not to weld it.

Mike
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Old 11-04-2012, 01:31 PM   #114
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Hey Dave.
With the arm the way it is the centre of gravity is just forward of the pivot point.
Therefore there is no pressure from the arm on the valve.
Yet the pivot point could be moved more towards the cam and this would move more of the weight forward decreasing the chances of pressure on the valve.
If people want a roller follower on the arm that is easy to do as well.
What about an eccentric for exhaust valve adjustment ?
Any ideas bring them up and I will draw them, remember I am not building one of these (yet) so whatever you want just say.
Then as soon as everybody who is in on this build is happy with the end results I will put out drawings for the different parts.
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Old 11-04-2012, 05:46 PM   #115
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ausdier; I believe you make some of the best, and easiest to understand drawings that I have seen.
I'm not from your neck of the woods. Just a displaced New Mexican, living in Texas, and loving it.
I am fairly new here, but your valving concept could be very adaptable to some of the ideas I've
been tossing around. Maybe this will get me started' as soon as the house is done.
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Old 11-04-2012, 10:04 PM   #116
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Thanks a lot guys and girls.
As well as making things I do enjoy CAD (can you tell ) and if I can help people with their projects to keep them interested even better. Here is a link to my main current project that I am helping with.
http://www.modelenginemaker.com/inde...pic,802.0.html
Then I have a scaled Ford engine to draw for another friend and also trying to squeese in another even more complex engine for a local mate, link here.
http://www.modelenginemaker.com/inde...ic,887.15.html
Post #28 can you guess.
Even help with patterns and casting.
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Old 11-17-2012, 03:09 AM   #117
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gone quiet in here, Ausdier's modifications are on the right track.

Anyone else got any thoughts?

Dave
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Old 11-17-2012, 03:21 AM   #118
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Hi Dave. I think the only reason its quiet in here is because now that we have some workable plans, thanks to Audier, we are all in our workshops making chips
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Old 11-17-2012, 03:53 AM   #119
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Hi Herbie, OK, well I'm sorta stuck at the moment, but perhaps Ausdier
has gone a little further with the drawings.
I think he is waiting for a response from all the team members
for approval of the new design before doing working drawings
for the head etc.

Dave

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Old 11-17-2012, 10:39 AM   #120
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Sure has got my approval


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