[mike leech]

Originally Posted by yruslo

Congrats on the HP Mike....will you make Beech Bend NMCA in May?

I'm not sure right now. They canceled my shoulder surgery due to the viral infection I had. Right now they rescheduled the surgery for May 11 but it would appear that may not happen depending on how quickly everything is cleared up but I get the greenlight.

If the car is running and I can move my arm I'll be there

[mike leech]

We actually gave up a few peak numbers but increase the average a bunch. This is actually what I feel is our best pull even though it's down 3 hp.

[Gary H]

Originally Posted by mike leech

We actually gave up a few peak numbers but increase the average a bunch. This is actually what I feel is our best pull even though it's down 3 hp.

Mike, what was the difference between the peak HP run and the better average one. Timing change?

[S/st 54]

Congrats Mike and all involved! I agree bad weather dyno day will show less power. But what I don't get is how you guys get into a dyno with dyno operator you trust,whenever you feel like it or when the weather is good. My experience is when my guy calls me To tell me what day his dyno is freed up I gota go no matter what the weather is or it could be months before he gets a open time to try it again ......anyway congrats hope your shoulder surgery doesn't keep ya down to long so you can get on the track soon!




69goat1 my guy said the same thing about humidity and 20+hp

[Jim Robertson]

Nicely done. Congrats to you and the crew for going where no e-head have been and for sharing such a significant milestone. Has any other e head achieved this power level? Did you move timing around during the pull with the digital box? Care to share any numbers on the ignition timing? Maybe I missed it but who's carb and what was the Cfm rating? Best if luck at the track with that beast.

[mike leech]

Originally Posted by S/st 54

Congrats Mike and all involved! I agree bad weather dyno day will show less power. But what I don't get is how you guys get into a dyno with dyno operator you trust,whenever you feel like it or when the weather is good. My experience is when my guy calls me To tell me what day his dyno is freed up I gota go no matter what the weather is or it could be months before he gets a open time to try it again ......anyway congrats hope your shoulder surgery doesn't keep ya down to long so you can get on the track soon!




69goat1 my guy said the same thing about humidity and 20+hp

While I will agree I am very fortunate to be taken extra serious buy some very competent folks in the automotive motor sports industry. I still have to deliver on my end. For example when someone is squeezing me into their Dyno schedule I need to be agreeable about which day works for them. And if it's raining that day then that's that. I would have loved to have dynode on Monday of this week. 40 water drains 37° 29.92 on the barometer. That there is horsepower air.

[mike leech]

Originally Posted by Gary H

Mike, what was the difference between the peak HP run and the better average one. Timing change?

We made a cam timing change.

[10second70GP]

That's impressive congrats !

[69Goat1]

Originally Posted by S/st 54

Congrats Mike and all involved! I agree bad weather dyno day will show less power. But what I don't get is how you guys get into a dyno with dyno operator you trust,whenever you feel like it or when the weather is good. My experience is when my guy calls me To tell me what day his dyno is freed up I gota go no matter what the weather is or it could be months before he gets a open time to try it again ......anyway congrats hope your shoulder surgery doesn't keep ya down to long so you can get on the track soon!




69goat1 my guy said the same thing about humidity and 20+hp

My Blower motor is sitting at the machine/dyno shop right now. I could have it dynoed any day I want. We watched the weather in the past and did it off the forecast. They have plenty of other engines they can put on the pump if I decide to wait and lots of those guys don't care about the air and use their time just to tune to peak HP/Torque and make sure the engine is broken in correctly.

I have decided not to dyno this one because it's just a street car engine and will see very little track action and I can spend the money toward something it needs much more...

[mike leech]

Originally Posted by Jim Robertson

Nicely done. Congrats to you and the crew for going where no e-head have been and for sharing such a significant milestone. Has any other e head achieved this power level? Did you move timing around during the pull with the digital box? Care to share any numbers on the ignition timing? Maybe I missed it but who's carb and what was the Cfm rating? Best if luck at the track with that beast.

As far as i know there is NO other NA pontiac running that has made tgat much hp on the dyno. For now......2 are coming soon

Let alone ehead cast intake and 1 carb. If so go right ahead and post a sheet.

[blueghoast]

That's bad ass Mike, Great job.

GT.

[mike leech]

Originally Posted by blueghoast

That's bad ass Mike, Great job.

GT.

Thanks Gary, and all others who commented as well.

[Hooter]

Damn Mike. Nice job. Way to make some steam.

[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.

[Tom Vaught]

This website does a fine job of explaining Air Density equations and Density Altitude Calculations, as well as having several very good calculators.

There are several different ways to get numbers for your air density calculations.

Enjoy.

https://wahiduddin.net/calc/density_altitude.htm

(Dyno Correction Factor Calculator)

https://wahiduddin.net/calc/calc_cf.htm

(Engine Tuner's Calculator - using dew point)

https://wahiduddin.net/calc/calc_hp_dp.htm

Tom Vaught

ps no need to argue about the weather. There are a hundred opinions from weather people on how to do it and they are still wrong 15% of the time.

[455firebird1969]

You didn't say you did it on a bad-air day, you said it was in the rain. I'm saying rain does not mean bad air. Like it or not, cold air cannot hold water vapor like hot air.

[mike leech]

For pete's sake please stop. You have an opportunity to learn something here. Please don't waste it.

[Half-Inch Stud]

Originally Posted by mike leech

We made a cam timing change.

There must be great satisfaction in being able to move the cam timing for improved (best) performance. Someday....HIS

[mike leech]

Originally Posted by Half-Inch Stud

There must be great satisfaction in being able to move the cam timing for improved (best) performance. Someday....HIS

The bop belt drive is the bomb. Very nice piece and easy to manipulate Cam timing to your satisfaction


Just make sure you have plenty of valve clearance for the changes you want to make