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dstaffeldt
07-08-2014, 09:04 AM
Working with a Continental A40-4 engine and looking for information as to what material the original valve guides were made of? Also whether the valve springs were originally cad plated or other from the factory? One final question is if anyone has had Aries pistons made for the A40 and if so, what part number to order?
Thank you,
David
Aaron Novak
07-08-2014, 10:51 AM
Certified or experimental category? I know the alloy of a pair of guides removed from an a-40 jug, but do not have the factory print. Pistons have been made by a number of companies, arias being one.
dstaffeldt
07-08-2014, 02:03 PM
Category doesn't really matter as this will not be going in a flying aircraft, but we want it as original as possible and in running condition.
David
Aaron Novak
07-08-2014, 08:51 PM
Ok, under that stipulation, the guides that I checked, which appear to be original were C90500 tin/bronze.
Aaron Novak
07-14-2014, 08:21 AM
So....did that help you out at all?
dstaffeldt
07-23-2014, 02:42 PM
Hi Aaron,
Sorry for my delay in responding. Yes it did. We're having new parts made and that did help. Do you know what the valve margins ( the contact face of the valve to the valve seat) would be? .040 or higher?
Thank you,
David
Aaron Novak
07-23-2014, 03:23 PM
Hi Aaron,
Sorry for my delay in responding. Yes it did. We're having new parts made and that did help. Do you know what the valve margins ( the contact face of the valve to the valve seat) would be? .040 or higher?
Thank you,
David

David,
One old Continental sheet I have lists 1/16" for the valve margin, which was a pretty common value at that time period. For the valve seat width (what I believe you are asking) you are looking more for .050" Intake and .070" Exhaust if using original materials.