Re: the Navarro Six, O-ring questions

[Tom Jennings <tomj@xxxxxxx>]

On Tue, 19 Jul 2005, Sandwich Maker wrote:

> " There's two waste gates, so I guess the exhausts are in parallel?
>
> i don't think that necessarily follows, though it does rather look as
> though the turbines -aren't- plumbed one into the other.  if you want
> to control the boost of each stage separately [to equalize the
> workload], you need a wastegate on each turbine.
>
> sudden thought: they're popoff valves, not wastegates.

You're probably right.

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.

With those numbers, the nomograph 650 - 700 hp looks about right.

If I 'play' the calcs and assume a turbo can do atmospheric to
45psi in one step (for comparison purposes only) it would be
r=4.1.

It seems very likely that two turbos in series probably is less
than twice as efficient (since obviously a lot of energy is taken
out of the exhaust gas by the first turbo) a total r=4.1, far less
than the theoretical r=5.76, seems ball-park reasonable.

But 50 psi plus or minus has got to be the number, to get 700 hp
from 182 ci.