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Old 08-26-2012, 11:01 AM   #41
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M6 x 0.75 sounds good for the plug thread, I have those taps for the thread in the head.
I have 7xxx series Ali blocks or centrifugally cast, cast iron to choose from
for the heads and valve blocks.
Stainless or silversteel for valves, I would prefer silversteel, easier to machine
in smaller dia's.
Brass for the valve seats?
Also, I am confused about the transfer port, drawing doesnt show drilling detail
to match valve seat retainers, not to mention exhaust and inlet ports.
Maybe its an age thing, or I am a page short of the book

Dave


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Old 08-26-2012, 11:18 PM   #42
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I was thinking more of the M6 x 1 standard thread Dave - would that be a problem? Otherwise I will have to buy a die in.


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Old 08-27-2012, 07:32 AM   #43
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M6 x 1 is ok, have those as well.

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Old 09-02-2012, 01:27 AM   #44
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Pinion blanks (steel) roughed out - now I gotta find something to do the big gear blanks, probably cast iron unless I have a lump of bronze I don't know about.

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Old 09-02-2012, 04:10 AM   #45
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Looking good Tel. Just wondering are we building 6 or 7 engines?
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Old 09-02-2012, 08:32 AM   #46
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Six as far as I'm aware mate, but I always make a spare on runs like that - that way you never bugger one up and need a spare!
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Old 09-02-2012, 09:15 AM   #47
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Good thinking. In my case I'll make two extras just to make sure
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Old 09-04-2012, 12:36 PM   #48
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I have profiled an ali block to the head shape, it is long enough for 8 heads
so will probably make 8, barring stuffups!
Similiar with transfer ports.
Dam small arent they,
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Old 09-04-2012, 11:01 PM   #49
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Yes, it is a small engine - smaller than the first look through the drawings seemed to indicate.

I got two (only) blanks for the big gear (in steel BTW) cut yesterdasy before I got interrupted.
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Old 09-05-2012, 05:04 AM   #50
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Hi guys. There seems to be a few dimensions missing on the crank shaft drawing (diameters), does anyone have any idea what they are? One dimension cannot be read also (distance of offset). Do we just match up where they go? Is there a tolerance?
How does the conrod connect to the cam shaft?

Also how does the cam lock onto the shaft it runs on?


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