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Old 09-05-2012, 08:04 AM   #51
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You might have to pick those dims up off the bearing and connecting rod drawings?

As far as the cams go, the attachment of the gears does not show eityher - I plane to put an M3 grubscrew in the bosses to hold 'em. Might do thou likewise with the cams.


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Old 09-05-2012, 11:40 PM   #52
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Hi all. Does anyone have hole sizes and position measurements for the base plate ?


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Old 09-06-2012, 03:05 AM   #53
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Can't see 'em - might be another case of picking them off the various components.

Moving right along - there's been a bit of a change in the game plan, as I turned up a bit of more suitable stuff for the 'big' gears.

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Old 09-06-2012, 12:46 PM   #54
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Picking off the components only tells me the mounting holes for the "supports" are 30mm apart. I cant seem to find a way of finding where on the base plate these mounting holes are drilled. Is it possible for someone that is familiar with computer CAD stuff to shed any light on this. Without measurements on the plans it has got me stumped
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Old 09-06-2012, 09:21 PM   #55
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Can't help much there I'm afraid - the more I look at these plans the more stuff I see missing
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Old 09-06-2012, 10:44 PM   #56
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then there is the valve porting issue, if one looks closely, the
valves are 6.4mm dia, and the port they open into is only
6mm dia.
there is no drilling detail shown for inlet/ex gases, nor anywhere
to bolt on a carby.

Also there is a huge amount of potential compression lost in the
large porting volume, my calcs suggest with the piston up against
the head a max comp ratio of only 3.4 - 1 is achievable.
Someone will need to check my calcs tho!

Has anyone seen a working model from these drawings?

Google reveals some interesting information about the
designer.

In the meantime, my chipmaking has ceased.

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Old 09-07-2012, 12:05 PM   #57
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I have managed to contact the designer and he seems happy to answer questions so I shall post the above queries to him. I shall also ask if there are any construction notes and if we can see a working model
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Old 09-07-2012, 12:23 PM   #58
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well done!

Maybe there is a completed set of drawings available,

free ??

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Old 09-07-2012, 02:32 PM   #59
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Thats what I'm hoping for. He seems genuinely interested and said "thanks for building this engine" so I gave him the web site address and invited him to join and follow our progress.
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Old 09-10-2012, 08:29 AM   #60
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Damn, damn, damn. damn, damn, damn, damn. damn, damn, damn, damn. damn, damn, damn, damn. damn, damn, damn, damn. damn, damn, damn, damn. damn, damn.

Made an extra pinion blank, as you all know, and then proceeded to roon TWO!!!!!! So back to making some more blanks - +2 this time!

The good news is the 'big' gear cutting went without a hitch - got 8 of them on hand now.


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