it seems counterintuitive that the engine temps would decrease as engine rpms increase...???
ABC'S of 80's Cooling Part IV - Hood Vents
- Thread starter SUMOTOY
- Start date
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concrete- engine RPMs increase leading to radiator fan RPMs increasing. An aux. temp gauge will show you your vehicle generally gets *warmer* at idle (little airflow through rad, low RPMs = low RPM rad. fan), and *cooler* at speed on flat roads (more airflow, higher RPM rad. fan) and during higher RPM idle (higher RPM rad. fan).
alaskacruiser said:
Also water pump is pushing more water.
i understand how it would cool while driving.....and i guess thanks to WALKING EAGLE i see that it would pump more coolant...so that does make sense. I was just thinking that if you were sitting idle and you started to rev the motor it seems it would get hotter not cooler.
- Thread starter
- #85
WE et. al:
Take a look at the before and after temps I posted above (post #76), and comment on them. That's what you have, pick away. I didn't use a temp probe, I used a highly convenient IR temp gun and zapped the same areas before and after. And there was a significant temp difference. With that, and the observed (not measured) driveablity, I concluded it's a good mod *for me*.
I understand the demand for more data, but my time invested in Parts I,II,III, and IV is more than I normally do on any tech forum. And my measures are more than most here have done to date. I have a passive interest in doing more measures. I also note a very passive interest by some of the pundits of making simple changes (or none) and putting up the *right* numbers on a stock truck.
Compare something, the same thing, or something better, more ideal. Or, just ignore it because you find the data insufficient.
I'm looking forward to watching a high view thread doing nothing except
and 
Cheers
Scott Justusson
Take a look at the before and after temps I posted above (post #76), and comment on them. That's what you have, pick away. I didn't use a temp probe, I used a highly convenient IR temp gun and zapped the same areas before and after. And there was a significant temp difference. With that, and the observed (not measured) driveablity, I concluded it's a good mod *for me*.
I understand the demand for more data, but my time invested in Parts I,II,III, and IV is more than I normally do on any tech forum. And my measures are more than most here have done to date. I have a passive interest in doing more measures. I also note a very passive interest by some of the pundits of making simple changes (or none) and putting up the *right* numbers on a stock truck.
Compare something, the same thing, or something better, more ideal. Or, just ignore it because you find the data insufficient.
I'm looking forward to watching a high view thread doing nothing except
and Cheers
Scott Justusson
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Gentlemen,
Let us please not degenerate ourselves to the chat board level today, OK?
Let us please not degenerate ourselves to the chat board level today, OK?
Ok Boys. Calm it down.
SUMOTOY - Please do not use abbreviations for anyones names anymore
SUMOTOY - Please do not use abbreviations for anyones names anymore
To continue the hijack.....CJ is used often for concretejungle...even though it's the abreviation of my name or the name of a J@@P, i don't get my panties in a wad. Seems like WE for walkingeagle would be fine and much easier to type. . .
hijack off....
hijack off....
Sumotoy has done some mods on his truck, and has taken the time to post about them. He has done more research and spent more time documenting and explaining it then you will ever get from me or most of the people on any forum. Take his information any way you want for what it's worth to you. There's no reason to beat him down for not doing his research the way you would like to see it. If the data isn't up to your standards, do it yourself. If you don't like his approach, ignore the posts. He's not holding a gun to your head and telling you to pick up a grinder and start cutting holes in your hood- he's posting up his experiences. I for one am interested in what other people do and try to learn from their triumphs and mistakes. Quit picking his data apart, please. Offering suggestions is one thing, this is turning into a bitch session.
-Spike
-Spike
-Spike- said:
xactly!
Stumpalama said:
I beg your pardon?
Stumpalama said:
I think he's referring to the abbreviation complaint, not your request.
Damn, things can get blown way out of proportion in text.
-Spike
Oh,
Anyway, I'm gonna cut someplace, I just haven't made up my mind where yet....
Anyway, I'm gonna cut someplace, I just haven't made up my mind where yet....
- Thread starter
- #94
Repost Of Before/after Vent Temp Data
I'd be more interested in comments directly to post 76, the data in which I post below.
IME, I find these temps are more significant than I normally see. That's an indicator to me that the 80 with a supercharger installed has a lot of trapped heat under the hood. And venting it appears to be a sound option to reducing those temps.
I'd like to see a comparo of someone elses data (don't care the method as long as it's repeatable) that would support, refute, accept, or conflict with my measures and observations. Stock or Supercharged truck.
Until I see that data, I'm quite pleased with the simplicity of the mod, and the results of it applied to my 80.
Peace
ST
****** BEFORE AND AFTER HOOD VENT TEMP DATA******
Combined from ABC Cooling Thread III and IV (pre and post hood vent temp data)
Raytek IR temp gun same spot in each test
A/C on fresh air (non recirc), Aux Fan on, 20minute heat soaked engine. Lift hood, zap temps within 10seconds.
Ambient temp 95F and 87F respectively
* BEFORE VENTS:
185-200F Airbox Temps
160-180F Firewall Temps (both sides)
* AFTER VENTS:
125-135F Airbox Temps
116-118F Firewall Temps (same both sides)
CONCLUSIONS OF DATA (Note: ambient temp drop of 8F):
65-75F drop in measured Airbox Temps
40-60F drop in measured Firewall Temps
And observed better hot start, better hot idle, better tip in throttle response, better SC response at all speeds, and better A/C efficiency.
ST
I'd be more interested in comments directly to post 76, the data in which I post below.
IME, I find these temps are more significant than I normally see. That's an indicator to me that the 80 with a supercharger installed has a lot of trapped heat under the hood. And venting it appears to be a sound option to reducing those temps.
I'd like to see a comparo of someone elses data (don't care the method as long as it's repeatable) that would support, refute, accept, or conflict with my measures and observations. Stock or Supercharged truck.
Until I see that data, I'm quite pleased with the simplicity of the mod, and the results of it applied to my 80.
Peace
ST
****** BEFORE AND AFTER HOOD VENT TEMP DATA******
Combined from ABC Cooling Thread III and IV (pre and post hood vent temp data)
Raytek IR temp gun same spot in each test
A/C on fresh air (non recirc), Aux Fan on, 20minute heat soaked engine. Lift hood, zap temps within 10seconds.
Ambient temp 95F and 87F respectively
* BEFORE VENTS:
185-200F Airbox Temps
160-180F Firewall Temps (both sides)
* AFTER VENTS:
125-135F Airbox Temps
116-118F Firewall Temps (same both sides)
CONCLUSIONS OF DATA (Note: ambient temp drop of 8F):
65-75F drop in measured Airbox Temps
40-60F drop in measured Firewall Temps
And observed better hot start, better hot idle, better tip in throttle response, better SC response at all speeds, and better A/C efficiency.
ST
Cut?
-Spike
-Spike
-Spike- said:
holes, in the hood and fenders.
Tin-snips?..
Air nibbler. Much more satisfying to work with powa tools. 
-Spike
-Spike
Stumpalama
Forum Junkie
Whew... Thanks Spike... That's exactly what I meant... No offense intended to you CDAN (I figured it was OK to abbreviate your name as I had seen it before with no objection from you). Sorry, I was refering to Walking Eagle's comment's.It sounded fine when I read it over before posting.
BTW I think my abbreviated nickname would be AHOLE but I don't think stumpalama breaks down that way
Homer Simpson put hole in his hood with a pick axe. They were "speed holes".
Ned: Whatcha diddely-doin', neighbor?
Homer: Aw, putting speed holes in my car. Makes it go faster.
Ned: Is that so? Well, gee, maybe the old Flanders-mobile could use
some -- [a shot rings out] aah! [Ned collapses]
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I'd actually like to see some simpler data. Next time you go for an extended drive measure the MPG. 1 way with vents open and the other with them closed.
From my own experience, I saw a measurable increase when I had finally got the engine temps under control. Tools R Us also feels that there was some benefit here as well.
All that other stuff aside I'd prefer data showing the benefit as a final outcome and not individual changes.
From my own experience, I saw a measurable increase when I had finally got the engine temps under control. Tools R Us also feels that there was some benefit here as well.
All that other stuff aside I'd prefer data showing the benefit as a final outcome and not individual changes.
- Thread starter
- #100
(Anyone can read my complete post history, if you have a double/triple syllable screen name, I've abbreviated it. It is now a non issue.)
Mr. Vogt:
I appreciate the offer you made. The 'abbreviated' version of my other responses: The data I collected is there, the conditions and observations noted. My simple target was that airbox temp, and I've reduced it more than I expected with hood vents, with many good incidental observed benefits. Surely (Airplane 1980), it would prove more effective to use *your* tool to post your data.
Let us know what you find.
ST
Mr. Vogt:
I appreciate the offer you made. The 'abbreviated' version of my other responses: The data I collected is there, the conditions and observations noted. My simple target was that airbox temp, and I've reduced it more than I expected with hood vents, with many good incidental observed benefits. Surely (Airplane 1980), it would prove more effective to use *your* tool to post your data.
Let us know what you find.
ST
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