Why is LOP (lean of peak) controversial?

They are.

Karl
wrote in message
ps.com...

I'm not doubting your numbers-but am not sure if the LOP people are
still using 14.9 HP/G.

Peter R. wrote:
" wrote:


If your CHT's are closer to 300 F than 400 F running those settings,
you've got one of the "cooler" installations that I've ever heard of...


The cylinders are new Superior Millennium cylinders with about 250 hours on
them, if that has anything to do with the cooler temperatures.

Hey, I have Superior Milleniums on my Bo too. Bet you didn't get yours
for free like I did.




And yes, my engine's CHTs are normally below or around 300 and have never
approached 400, routinely.

I would have to work to get my CHT's anywhere near 400.

Doug,

You're right about carb'd engines. However, I still think it is vital
to understand the basic principles of how the engine works, carb'd or
not. And "leaner=hotter" or "richer=better" is simply wrong.

The problem with LOP, isn't running LOP, its
that you are running peak and THINKING you are running LOP.


Not if you are below 75 percent power. Then the problem pretty much
goes away.

--
Thomas Borchert (EDDH)

"Newps" wrote in message
. ..


Peter R. wrote:
" wrote:


If your CHT's are closer to 300 F than 400 F running those settings,
you've got one of the "cooler" installations that I've ever heard of...

Quite! I have SM's in my TNIO-550 (albeit they have over 1700 hours, but
they are not markedly different than when they were new) and they typically
run about 340-360 with a very occasional high of 380.

Quite interesting how is are not only low, but verging on cold. :~)



The cylinders are new Superior Millennium cylinders with about 250 hours
on
them, if that has anything to do with the cooler temperatures.

Hey, I have Superior Milleniums on my Bo too. Bet you didn't get yours
for free like I did.

Weren't you having trouble with the folks at Millennium? What's the poop?

Matt Barrow wrote:


Hey, I have Superior Milleniums on my Bo too. Bet you didn't get yours
for free like I did.


Weren't you having trouble with the folks at Millennium? What's the poop?

I never had Milleniums. The guy who owns Pponk told me he would not
sell me Milleniums unless I absolutely had to have them. They were
having warranty issues with Superior. I don't know if that has changed
or not, I hope so. At my annual last month I had a bad cylinder, the
head was pulling apart from the base. I mentioned this fact on a Beech
email list that I am involved with. One of the vice presidents of
Superior, who flies a Baron, contacted me and originally offered me a
free cylinder assembly if I would send them the bad cylinder. I said
sure. Then the next day they offered me 6 cylinders if I would send all
six of mine back to them. I said sure. When I originally posted my
email I mentioned that my cylinders were .010 oversize and I think they
realized that sending me one free cylinder was kind of silly, I couldn't
use it. I was just going to sell it on ebay. Then they sent an email
saying they would pay for next day air both ways and then another email
saying they would pay for removal and replacement, which was $1500. I
now have about 7 hours on my top overhaul. I also get a 3 year/500 hour
no questions asked warranty which everbody who buys their cylinders
gets. So that was about a $9000 deal I got just for mentioning my
original cylinder problem. They couldn't have been nicer, hopefully
that will be everybodys experience when dealing with them for whatever
reason.

karl gruber wrote:

You more than likely have an CHT indication problem. There is no reason your
airplane should run much cooler than the fleet.

On all six probes? That seems a tad unlikely. Additionally, are you
really in a position to speak for the fleet?

In any regard and given the responses here, I have a call in to Tornado
Alley Turbo's director of maintenance. If anyone will have the most
accurate response, it will be this person. When I receive a response I
will post it here.

Oh, I just remembered that I had sent TATurbo my JPI data file after the
first 50 hours on this rebuilt engine, sometime late spring 2004. They
responded that all data points (including the CHTs) looked well within
accepted ranges. Had they had a concern about CHTs, that would have been a
perfect opportunity to raise it with me.

--
Peter

Ray Andraka wrote:

Is your JPI set up for the correct probe type?

Could you expand on this? I do not know the answer and if this might be
the case, I would like to be able to approach my mechanic with an educated
question.


--
Peter

Newps wrote:

I would have to work to get my CHT's anywhere near 400.

What do you see routinely during cruise?

--
Peter

Peter wrote:

What aircraft is this?

A Bonanza V35B with an IO-520. Engine monitor is a JPI 800.
--
Peter

Newps wrote:

I mentioned this fact on a Beech
email list that I am involved with.

What list is this?

--
Peter