[Jack Gifford]

Originally Posted by mike leech

... Digital 7
Matching coil
Moroso wires extra sheilding
Msd distributor with pro cap...

Crank trigger? Hall effect?

[mike leech]

Originally Posted by Jack Gifford

Crank trigger? Hall effect?

Crank trigger jack

[455firebird1969]

No sleep for the wicked...congrats Mike. Rain is not suspended in air. Air temp is directly related to its ability to retain water vapor. What was the temp, that tells more about your conditions, unless you want to divulge the entire armospheric environment.

[BADDTA]

Congrats Mike! You take persistence to a whole new level! Lol. Now get that bad boy in the car and make some hits.

Brian

[mike leech]

Originally Posted by 455firebird1969

No sleep for the wicked...congrats Mike. Rain is not suspended in air. Air temp is directly related to its ability to retain water vapor. What was the temp, that tells more about your conditions, unless you want to divulge the entire armospheric environment.

LOL!!!! Really. So water falling out of the sky is not suspended? I know all about moisture in the air. More than you might think. Dynoing on a rainy day will make less power due to a much greater amount of water in the air. That's why you need to add more timing too. but feel free to think watever you want.

[Probird]

Very nice Mike!!

[455firebird1969]

I'm basing my statement from meteorological facts. What was the air temp? That will dictate the maximum water vapor content. And no, rain is not water vapor, so it does not affect density altitude. Rain is liquid, it is not suspended in the air.

[john marcella]

Water grains affect me at the track huge! I look at that as much or more than anything else.

[mike leech]

Originally Posted by john marcella

Water grains affect me at the track huge! I look at that as much or more than anything else.

Ever seen an engine lose 20 hp on back-to-back days up to the same Dyno?

[Scott Stoneburg]

Great power mike. Very impressive.

[mike leech]

Originally Posted by 455firebird1969

I'm basing my statement from meteorological facts. What was the air temp? That will dictate the maximum water vapor content. And no, rain is not water vapor, so it does not affect density altitude. Rain is liquid, it is not suspended in the air.

LOL again. You're killing me here. Obviously falling rain is not suspended or it would not be falling. I don't really care about meteorological facts or summations. I'm pretty sure it would be atmospheric facts but i digress. I have my very own psychrometric chart and know how to use it quite well. I also have zero interest in debating what it might have made or should have made or might make somewhere else.

I handle moisture issues and solve problems relating to moisture for a living. I also regularly explain these conditions to engineers and environmental people. So please just let it go. If you THINK the dyno corrects for these conditions AND that the correction is a true and accurate representation then good for you i guess.

I know better. I've seen the same engine hooked to the dyno make 25 hp less on consecutive days due to weather. And it was not raining. Just humid.

And besides i posted the sheet.

[mike leech]

Thank you all for the kind words. Time to go in the car!

[cfmcnc]

Great job Mike and All involved.Its fact dyno on a bad day makes less ,corrects less and you have to change tune to deal with water in the air.Bill C.

[slowbird]

Nicely done Mike!

[455firebird1969]

Maybe the low pressure air that is normally associated with rainy atmospheric conditions is where it went? Your engine is a bad Poncho and that's all I really care about. Congrats on keeping it together and thanks for sharing this info.

[Elarson]

Originally Posted by 455firebird1969

Maybe the low pressure air that is normally associated with rainy atmospheric conditions is where it went? Your engine is a bad Poncho and that's all I really care about. Congrats on keeping it together and thanks for sharing this info.

Humidity displaces oxygen. Think of it this way. Every water molecule in the air going into your engine takes the place of a useful oxygen molecule that would have otherwise gone in.

Rain isn't the culprit directly, but a rainy day has high humidity.

Eric

[455firebird1969]

Originally Posted by Elarson

Humidity displaces oxygen. Think of it this way. Every water molecule in the air going into your engine takes the place of a useful oxygen molecule that would have otherwise gone in.

Rain isn't the culprit directly, but a rainy day has high humidity.

Eric

My initial point was rain is not water vapor. (Mike said he did it in the rain). Water vapor affects density altitude (which affects performance), rain does not. Rain is the result of atmospheric conditions. If he had stated he did it in low pressure air or poor conditions, I would not have provided input. My point is cold air cannot hold as much water vapor when compared to warm or hot air. Simply because it is raining, does not necessarily mean you have a high water vapor content. High humidity does not indicate high water vapor content. If the air is cold, things change. Saying a rainy day has high humidity is vague unless you include the tempurature.

The psychometric chart indicates 50 f. air / at 90% humidity holds 49 grains per pound water vapor.
While, 90 f. air / at 70% humidity holds 150 grains per pound of water vapor.

37 f. air with 100% humidity can only hold 33 grains per pound.

Mikes performance is stellar, and I congratulated him, it's not about his achievements.

All I'm trying to do is help those reading this to understand how meteorology works.

[mike leech]

Originally Posted by 455firebird1969

My initial point was rain is not water vapor. (Mike said he did it in the rain). Water vapor affects density altitude (which affects performance), rain does not. Rain is the result of atmospheric conditions. If he had stated he did it in low pressure air or poor conditions, I would not have provided input. My point is cold air cannot hold as much water vapor when compared to warm or hot air. Simply because it is raining, does not necessarily mean you have a high water vapor content. High humidity does not indicate high water vapor content. If the air is cold, things change. Saying a rainy day has high humidity is vague unless you include the tempurature.

The psychometric chart indicates 50 f. air / at 90% humidity holds 49 grains per pound water vapor.
While, 90 f. air / at 70% humidity holds 150 grains per pound of water vapor.

37 f. air with 100% humidity can only hold 33 grains per pound.

Mikes performance is stellar, and I congratulated him, it's not about his achievements.

All I'm trying to do is help those reading this to understand how meteorology works.

Really? Thats what you're trying to do? I'd rethink that.....


Several credible sources have pointed out the truth about dynoing on a bad air day and its effects. One that owns and runs a dyno. Maybe the learning opportunity is closer to home than you think. No offense. But who the hell thinks the the water grains are not high when its a rainy day. Come on.

A lot dyno cells use shop air for the input. So that adds to the issue as the temp comes from the shop and the water grains and pressure ar fed by the atmosphere.

[Money Pit]

That is one bad bitch! Congrats

[cosgrove]

Good result Mike. I'm sure the power will show in the car.
Torque had a nice sweet spot at 7700, just like you predicted.
Power was down some by your predicted peak of 8600. I can hear the turning gears in your head from Iowa.
Might have been the air, but I bet you get just a little more air in and out of that thing before it ever goes on the pump again.