Re: the Navarro Six, O-ring questions

[Tom Jennings <tomj@xxxxxxx>]

On Mon, 18 Jul 2005 farna@xxxxxxx wrote:

> wow! double o-ringed block!!

It's weirder than that too. I have no idea what compression ratio
was used, until I can find the rods, measure the crank, figure out
what gasket was used ...

XXXX errrt! no head gasket could be used! the O-rings would not
work! Duh! The sealant is for the water jacket and oil. Umm I knew
that, right.


I'll do the math later, but here's a quickie: There's a
turbo-selection nomograph in the MacInnes book. Using what I do
know about this motor (182 ci, 640 hp, TE06 turbo) and assuming
7000 rpm, the boost required to acheive 640hp is literally off the
chart -- far more than 30 psi. Interpolating, probably close to 50
psi.


[I said earlier there were TWO TE06's on the Indy motor. That's
wrong. I don't know where I got that. Though I took crappy
pictures of the Indy motor there's clearly only one. Duh.  My
bad.]

50psi doesn't make sense then. A TE06 will do a pressure ratio of
3.0 at the top of the compressor map top efficiency, and 50 psi
would be about 4.3 (I think). r=3.0 would be about 30psi, and
182ci with 30 psi boost is only! 550hp. I got "640hp" from the
web...

That puts flat-out peak air flow around 50 lbs/min consistent with
550 hp, or 3 hp/cu in.

At 8000rpm, you can do this with 25 lbs boost, but then the TE06
has run out of poop.

There was no intercooler, so the air goes in as hot as a
blowtorch.

Valve lift is probably over .500". The block has valve reliefs
.25" deep, both int and exh.  The top ring is .3125" down from the
crown.  I estimate the valve could open about .6" without hitting
anything (I know those numbers don't add up). But both heads have
shaft-rockers, I wouldn't think you could get a half-inch lift at
the valve with those, the geometry would get wierd at the
extremes, right?