Blue Sky tuning

David Redszus · Post by **David Redszus** » Thu May 10, 2012 1:53 pm

Has anyone else ever noticed that engines run best when skies are blue?

roadrunner · Post by **roadrunner** » Thu May 10, 2012 5:15 pm

YES! ....and my car only breaks down when it's raining!

johnv · Post by **johnv** » Fri May 11, 2012 6:15 pm

that is the best air . it always happens when your working

af2 · Post by **af2** » Fri May 11, 2012 6:20 pm

And the grass is green so you have way more O2.

POS Dakota · Post by **POS Dakota** » Fri May 11, 2012 6:52 pm

MODNROD · Post by **MODNROD** » Fri May 11, 2012 7:45 pm

roadrunner wrote:YES! ....and my car only breaks down when it's raining!

You running a Ducati engine in that thing?

roadrunner · Post by **roadrunner** » Fri May 11, 2012 8:23 pm

MODNROD wrote:
roadrunner wrote:YES! ....and my car only breaks down when it's raining!
You running a Ducati engine in that thing?

har har

, no....it's actually what some people call "jap crap", Isuzu diesel.....go figure!

Shopboss · Post by **Shopboss** » Sun May 13, 2012 6:14 am

I have noticed there's a direct correlation with running out of gas and leaving my cell phone on top of the TV at home.

David Redszus · Post by **David Redszus** » Sun May 13, 2012 10:01 am

David Redszus wrote:Has anyone else ever noticed that engines run best when skies are blue?

I am not kidding. Its true. But why?

Post by **Stan Weiss** » Sun May 13, 2012 10:47 am

David Redszus wrote:
David Redszus wrote:Has anyone else ever noticed that engines run best when skies are blue?
I am not kidding. Its true. But why?

Less humidity?

Stan

dfree383 · Post by **dfree383** » Sun May 13, 2012 10:49 am

Shopboss wrote:I have noticed there's a direct correlation with running out of gas and leaving my cell phone on top of the TV at home.

I've noticed that too..... Strange coincidence? Hummmm......

Kenova · Post by **Kenova** » Sun May 13, 2012 10:53 am

David Redszus wrote:
David Redszus wrote:Has anyone else ever noticed that engines run best when skies are blue?
I am not kidding. Its true. But why?

I'm not 100% positive, but I think clear blue skies are the result of a high pressure system. It also results in, as Stan mentioned above, less humidity.

Ken

David Redszus · Post by **David Redszus** » Sun May 13, 2012 2:29 pm

Kenova wrote:
David Redszus wrote:
David Redszus wrote:Has anyone else ever noticed that engines run best when skies are blue?
I am not kidding. Its true. But why?
I'm not 100% positive, but I think clear blue skies are the result of a high pressure system. It also results in, as Stan mentioned above, less humidity.

Ken

Yes, you and Stan are correct. Cloudless skies indicate lower humidity with resuting higher air density since water vapor is lighter than air. Clear skies indicate a high pressure system which also raises the air density.

Could it be that engine tuning to the weather could be as simple as:
blue sky, go up a jet size, retard timing
gray sky, go downb a jet size, advance timing.
Perhaps. Needs testing and verification.

PackardV8 · Post by **PackardV8** » Sun May 13, 2012 2:51 pm

My engines, especially any supercharged/turbocharged, always liked it the colder and foggier the better.

The blue sky runs better must be a NA SBC thang.

jack vines

roadrunner · Post by **roadrunner** » Sun May 13, 2012 6:12 pm

Both of my turbo diesels run much better on a cool evening, yet when it's raining I lose a small amount of power, and on a hot dry day I lose even more! This is a mechanical injection engine with no compensation for air temp at all. Where does the extra power come from? Does air expand at a linear rate as it heats up?

Don Terrill’s Speed-Talk

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