[DeTomaso] Epoxy in Injector Pockets????

[Tomas Gunnarsson]

Generally speaking I'd say that if there's a press fit that doesn't leave any room for epoxy (which to me is the definition of a press fit) the epoxy does no good in that spot anyway. Any scraped off epoxy should end up around the edge of the hole acting as a sealant in case there's a passage for air around the pocket. My understanding is that the precision in shape of the hole is determined by the state of the drill/milling bit and the rigidity of the machine, not the method per se. It's hard to advise without seeing the parts but Göran said his parts have held up for many years. Maybe your shop knows what they're doing? ;-)

Tomas
  ----- Original Message ----- 
  From: Ken Green 
  To: detomaso at realbig.com ; Tomas Gunnarsson 
  Sent: Wednesday, January 20, 2010 11:23 PM
  Subject: Re: [DeTomaso] Epoxy in Injector Pockets????


        Tomas,

            I wondered about a press fit and epoxy.  I need to understand epoxy better.  It seems like a press fit would scrape all the epoxy off the mating surfaces, unless the surfaces have scratches that hold some of the epoxy?  Is this an issue or is there a small residue that remains that bonds the parts?  I know that it's good to have a minimum amount of glue between surfaces in most instances, but does that extend to press fits?

            The holes will be milled not drilled, so they will be a very good fit.  But, the injector pockets will not be perpendicular to the roof of the runner, so that may affect a press fit?

        Ken    

        --- On Wed, 1/20/10, Tomas Gunnarsson <guson at home.se> wrote:


          From: Tomas Gunnarsson <guson at home.se>
          Subject: Re: [DeTomaso] Epoxy in Injector Pockets????
          To: detomaso at realbig.com
          Date: Wednesday, January 20, 2010, 1:36 PM


          I share your feelings regarding epoxying metal to metal in an engine application. How about a loose press fit with the epoxy acting more as a sealant? The loose press fit could be achieved by drilling the holes and/or turning the injector holders to zero press fit, then scarring one of the surfaces for a small interference fit. I haven't seen the parts so I don't know if this is practical though.

          Tomas

          ----- Original Message ----- 
          From: "Ken Green" <kenn_green at yahoo.com>
          To: <detomaso at realbig.com>
          Sent: Wednesday, January 20, 2010 12:31 AM
          Subject: [DeTomaso] Epoxy in Injector Pockets????


          > I'm having a manifold converted to EFI and the shop thinks it's better to epoxy the injector pockets into the manifold than to weld them. I bought MSD pockets, and they say "epoxy in" on the label. It's a little scary, but there in no structural issue, and it's not like adding epoxy inside ports that can break loose. Is it a waste of $s to have the pockets welded in?
          > 
          > Ken
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