Re: the Navarro Six, O-ring questions

[Tom Jennings <tomj@xxxxxxx>]

On Wed, 20 Jul 2005, Sandwich Maker wrote:

> " I made a spreadsheet with some of the basic turbo calcs. With the
> " TE06 and motor at 6000 rpm, one turbo would produce 20psi and
> " r=2.4. A second TE06 at r=2.4 with input at 20psig makes 45psig
> " output.
>
> wild guess: 'r' is pressure ratio, right?

D'oh, sorry, yes.

> then, using a for atmospheric pressure and b for boost,
> ( a * r ) - a = b
> right?
>
> if so, r=2.4 gives b=20, and r=4.1 gives b=45, pretty closely.

The MacInnes book specs inlet pressure as PSIA (absolute, eg. 14.7
seal level) but PSIG (guage) outlet pressure, eg. what you'd see
on a gauge. Hence, inlet to the second turbo (pending Frank's
observations that they're in parallel, not series...) is 20+14.7 =
34.7 ("35").


> if my equation above is right, then for two equal-step turbos in
> series the equation would be
> ( a * r * r ) - a = b
> and r=2.4 gives b=70!  r=2.0 gives b=44.

...
> " But 50 psi plus or minus has got to be the number, to get 700 hp
> " from 182 ci.
>
> just fyi and fwiw, two turbos of r=2.1 give b=50 on the nose.


> going to run intercoolers?


Oh I would never do any of this! It's waaay outa my league from
skills, cost, etc. I'm just trying to work out what Navarro built,
really, just to work up a rational basis to go ask him questions.

If I do end up building something around this motor, it'd be a
single turbo far, far below anything like these numbers.  The
attraction of this engine is, if it was designed to be reasonably
reliable at 50psi boost/600hp, it ought to take a nap at 20 psi
boost/300hp.

Easier said than done though -- to actually get this thing in a
car is another story. The block boss on the left used to mount
P.S. pump has been drilled out for oiling, I don't know if a stock
oil pump could feed the huge galleries, what strong transmission
will bolt to the Rambler six block, etc.

For now it's casual documentation in preparation for detailed
documentation, which I'll write up.