Engine building mailing list?

[Greg Hermann]

>You would think the businesses that sell advanced engine parts would know
>what they
>are doing.  I have a friend who works for Bell Helicopter.  They were
>contacted by an
>engine equipment company (may have been Rehr-Morrison) who was having
>problems with
>their piston rods.  They were making them out of 4130.  4130 can't be heat
>treated
>properly in thicknesses over 1 inch.  The Bell employees informed them of
>that and
>suggested a better choice in that family of steels was 4340.  The other
>guys said,
>"Oh" and hung up.
>
>So, they may not even know of any other choices.  The 4340 is selling as
>the best and
>why try to market something else they have no experience with?
>
>Joe Boucher
>'70 RS/SS Camaro  '81 TBi Suburban

Kinda what I thought too, Joe, but somebody oughtta tell 'em it machines
about like 1120X when in an annealed state---That should at least make 'em
think a bit--IF they have any idea of how to do that--

Of course we're dealing with the same friendly folks who call inconel and
hasteloy "stainless" and silicon "silicone", so perhaps no hope!!

Greg
>
>> And whyinell don't more folks make more stuff out of maraging steels
>> insteada good ol' 4340E?? (Any number of reasons why they sould be better
>> for things like cranks and rods, including higher strength, better impact
>> resistance, easier machining, etc., etc.!!)
>>
>> 6 AL 4 is pretty much the Ti alloy of choice for most internal engine bits.
>> (Unless, of course, you get into unobtanium!!)
>>
>> Regards, Greg