(no subject) 25v

[Ken Keith]

Wouldn't you need some sort of special cam too?  What do the 25v valvetrains look like?

I was thinking about something like this just the other day as a matter of fact.  I wondered if it would be possible to locate an unmachined casting in order to machine your own valve holes and such.  But I guess the ports are probably cast into the head prior to machining.

I also wonder about lost foam casting.  My Saturn uses that technology for the aluminum block and head, at least.  I saw a similar head (looks like styrofoam spray painted silver) at the machine shop that turned my Audi flywheels.  That head turned out to be a Chevy S10 pickup head.

If it's possible to copy the head by making a cheap mold that was only strong enough to be able to blow styrofoam into.  Then you could use that styrofoam replica to sand cast a new head.  Or you could maybe do the lost wax method I suppose.  I don't know much about that.  These would both be investment casting methods, since the "investment" of the wax or styrofoam is lost in the process?

Ken

Mihnea Cotet mik at info.fundp.ac.be wrote:
<<
>It would be easier to glue them together.  A couple
>tubes of JB weld should do it.  I've actually wondered
>if welding them together could actually be done?

I think this would be feasible for a good welder, though the TIG could just
weld the water passages together... But it's a good idea indeed...anyone
has a spare (or two, even warped or cracked) 1.8 20v head they want to
donate so I could make my own 25v head :-)))))))) ???>>