[Vwdiesel] 1.6 NA vs. 1.6 TD

[LBaird119 at aol.com]

> So... If I read this correctly...
>
>  Cam geometry is the same.
>  Valve sizes are the same.

  Both yup.

>  Oil pump increased in size. (I need it for Vanagon application.  Have to
>  use smaller oil pump.)

  You can use the larger pump or the even larger pump, just change the
pickup.  Check clearance but it'll VERY likely fit with no problems.  The
pickup will just swap, should anyway.

>  Jets added to cool bottom of pistons. (perhaps the reason for the larger
>  oil pump?)

 That plus the turbo itself is good for about 20psi in pressure drop.

>  Head is a different alloy.
>  Swirl chamber insert is a different alloy.

  Seems to be but doesn't seem to be an issue either way.

>  Thicker block deck.

  I never noticed this one.  Interesting since the decks never seem to
warp.  Not to be confused with the deck height.  :)

>  Tougher crank.

  Other things I've read only indicated surface hardening of the rod
journals, which is gone on a regrind.  :(  <shrug>

>  Added harmonic balancer.
>  Different pistons to accommodate above mentioned cooling jets. CR stays
>  the same....
>  Valve material changed.

  Only thing I've seen elsewhere was the plasma coating on the valves.
They cost about 3 times as much.  I wonder why they didn't just switch
to sodium filled?  :)
>
>  All-in-all, it sounds as though a TD long-block would be an improvement
>  over a NA long-block.  The only concern I see is the oil pump size.
>  Everything else seems to be an improvement.
>
>  Jim

  You wonder why they didn't just do all of them (for the most part) as the
same TD block?  Sure the oil jets would up the price as would the valves,
but most of it shouldn't have and with streamlining the building process...
  I've put the 36mm pump in 3 different diesels and it fits right in.  Should
work on the Vanagon oil pan as well.  I have to do one on the Dasher one
of these days as well.
     Loren