V8 fuel flow

"Big John" wrote in message news
Blueskies

Are you saying that if you lean the mixture until engine quits, then
the EGT goes down?

I'm still alive but lurking )

Big John
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~````

On Wed, 19 Jan 2005 23:09:06 GMT, "Blueskies"
wrote:


"stol" wrote in message oups.com...
Lean mixture makes the exhaust hotter, not a rich mixture.


Up to a point, then it gets cooler...



Well, some folks argue for best economy they lean the mixture then go past peak to the lean side of peak which lowers
EGT...YMMV

Ben, I misunderstood the 310-to-240 derate... however, even with that
change, YOUR numbers still do not work. In your first post (the one I
was replying to...(you changed to 12.6 in this last post)) you stated
fuel flow of "...11.8-12.3 an hour...". If one uses 12.3, this
computes to (12.3 x 5.85)/240 = 0.3
If one uses the 11.8 number, this computes to (11.8 x 5.85)/240 = 0.29
BSFC.

Now, to say something nice..... I found the photos of your engine
installation to show nothing less than beautiful workmanship!!
Regardless of how the numbers shake-out, it is a conversion to be proud
to show.

73,
Sid

wrote in message oups.com...
Ben, I misunderstood the 310-to-240 derate... however, even with that
change, YOUR numbers still do not work. In your first post (the one I
was replying to...(you changed to 12.6 in this last post)) you stated
fuel flow of "...11.8-12.3 an hour...". If one uses 12.3, this
computes to (12.3 x 5.85)/240 = 0.3
If one uses the 11.8 number, this computes to (11.8 x 5.85)/240 = 0.29
BSFC.

Now, to say something nice..... I found the photos of your engine
installation to show nothing less than beautiful workmanship!!
Regardless of how the numbers shake-out, it is a conversion to be proud
to show.

73,
Sid


What is the fuel used in that engine - autogas, 100LL?

wrote:
Ben, I misunderstood the 310-to-240 derate... however, even with that
change, YOUR numbers still do not work. In your first post (the one
I
was replying to...(you changed to 12.6 in this last post)) you stated
fuel flow of "...11.8-12.3 an hour...". If one uses 12.3, this
computes to (12.3 x 5.85)/240 = 0.3
If one uses the 11.8 number, this computes to (11.8 x 5.85)/240 =
0.29
BSFC.

Now, to say something nice..... I found the photos of your engine
installation to show nothing less than beautiful workmanship!!
Regardless of how the numbers shake-out, it is a conversion to be
proud
to show.

73,
Sid

Thank you sir. I am using a JPI 450 fuel flow gauge and it is still in
the calibrate test mode. It appears to read a bit on the low side,
maybe 8 to 10 % I am making repeated flights to verify the true flow
though it. Ya see I used the bigger transducer to be sure of proper
flow though it in case I needed to gravity feed to motor in case both
fuel pumps fail. That change probably confuses the 450 head unit. I am
sure the flows to the carb and engine are correct as all my plug cuts
show a good color and after years of being in the engine development
business I am pretty sure what a proper running engine should feel
like. To answer the other guys question, so far I have only used 100LL
just to make sure I don't get too far off baseline. I do admit I have a
new respect for test pilots,, thats for sure.. I will keep posting
results as they are produced. Ya have to keep in mind I realize this
thing might do me in on the next flight, but thats the price to pay for
pushing the envelope.

Ben Haas N801BH

wrote:
Ben, I misunderstood the 310-to-240 derate... however, even with that
change, YOUR numbers still do not work. In your first post (the one
I
was replying to...(you changed to 12.6 in this last post)) you stated
fuel flow of "...11.8-12.3 an hour...". If one uses 12.3, this
computes to (12.3 x 5.85)/240 = 0.3
If one uses the 11.8 number, this computes to (11.8 x 5.85)/240 =
0.29
BSFC.

Now, to say something nice..... I found the photos of your engine
installation to show nothing less than beautiful workmanship!!
Regardless of how the numbers shake-out, it is a conversion to be
proud
to show.

73,
Sid

Thank you sir. I am using a JPI 450 fuel flow gauge and it is still in
the calibrate test mode. It appears to read a bit on the low side,
maybe 8 to 10 % I am making repeated flights to verify the true flow
though it. Ya see I used the bigger transducer to be sure of proper
flow though it in case I needed to gravity feed to motor in case both
fuel pumps fail. That change probably confuses the 450 head unit. I am
sure the flows to the carb and engine are correct as all my plug cuts
show a good color and after years of being in the engine development
business I am pretty sure what a proper running engine should feel
like. To answer the other guys question, so far I have only used 100LL
just to make sure I don't get too far off baseline. I do admit I have a
new respect for test pilots,, thats for sure.. I will keep posting
results as they are produced. Ya have to keep in mind I realize this
thing might do me in on the next flight, but thats the price to pay for
pushing the envelope.

Ben Haas N801BH