is lean cruise bad for the engine

[ExtTB]

would this affect the life of the engine even if i could do it in my LL8 I-6??

[Highlander]

its not bad for the engine. Only problem is if it pings...

[Boost]

I'll have to try to figure out how to enable that. I am getting tons of requests for ecomony tunes. Guess I better read up on custom OS...

[ScarabEpic22]

Well since the LL8s have never been able to do lean cruise like the Holden rides or 04 GTO, I dont know how you'd do it. As Highlander said, shouldnt have any effect unless it pings.

[2002_z28_six_speed]

Yes and No.

If you live in an emissions state they will nail you for the NoX emissions.

It can be a problem if you don't have it set up well.

I have tried running the engine at 17:1 for short periods of time. Basically what I have heard is as long as the load is low you will be ok.

[87gmc]

Been running lean cruise for a couple of years now. Just get ready for it to burn the cats up

[2002_z28_six_speed]

Not a problem here. No reason at all!

[Sid447]

I was under the impression,

lean-cruise raises cylinder head temps and thus raises ECT?

[Garry]

I was under the impression,

lean-cruise raises cylinder head temps and thus raises ECT?

Lean condition raises the burn temperature, so yes, anything will heat up more. Anyway, as someone else stated, under low load, this usually isn't a real problem. The only thing to watch out for is the cats, if you still have some ... IIRC, cat protection will add additional fuel when it kicks in to lower exhaust temperatures ...

lean cruise actually makes, don't think it's going to turn a 6.0L in to a Honda Civic!

Well, I sincerely hope not! J/K

[vzsv8]

I don't aggree that leaning the mixture ( from stoich ) will increase temp. If we are running lean at cruise than the load is clearly low, so if we go lean we are going lean from 14.7. Therefore less fuel than optimum, giving less temp.
This is not a guess, pilots regularly run 75% throttle at cruise and 50 degrees Celcius colder than stoich, for best safe economy.
On the other hand, if we start at 12.5 or so at full load and start to lean off temps will certainly increase, toward 14.7.
Does anyone have an EGT gauge and the ability to run lean cruise? There would be some interesting data to be gathered.
I think that PLX will be getting an order for Fathers' day
Cheers, Steve