Aluminum Valve Covers - do they help keep head temps down?
bus914 - October 14th, 2013 at 08:22 PM
Do they help keep head temps down?
bajachris88 - October 14th, 2013 at 09:25 PM
Be cool if they had copper! 
Craig Torrens - October 14th, 2013 at 09:35 PM
| Quote: |
Originally
posted by bus914
Do they help keep head temps down?
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no
matberry - October 14th, 2013 at 09:47 PM
| Quote: |
Originally
posted by Craig Torrens
| Quote: | Originally
posted by bus914
Do they help keep head temps down?
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no
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x2
68AutoBug - October 14th, 2013 at 11:01 PM
| Quote: |
Originally
posted by bus914
Do they help keep head temps down?
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HI
I have these finned alloy tappat covers.. I believe that they should work on keeping heat down.. the alloy fins work as a heatsink in which hot air
blows over the fins..
cheers
Lee
HappyDaze - October 15th, 2013 at 05:20 AM
They may increase the 'impression ratio'.
Governor - October 15th, 2013 at 06:28 AM
| Quote: |
Originally
posted by HappyDaze
They may increase the 'impression ratio'.
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Only of they have EMPI written on them ...lol
vlad01 - October 15th, 2013 at 03:36 PM
physics says yes they work! in practice it would only be few 100ths of a degree as the fins have stuff all surface area. In fact the stock black
covers will radiate heat faster since its black
lets put it this way, I were to use that sized heat sink on my computer's CPU with that many fins, it would die in about 3 min and CPU will burn.
What I have is a square of silicon about 10mm x 10mm that has just under 1.5 m2 of surface area for the heat sink and still runs hot. how much heat
does an engine make?
modulus - October 15th, 2013 at 03:39 PM
| Quote: |
Originally
posted by HappyDaze
They may increase the 'impression ratio'.
|
I guess that's the ratio of:
What you think they might do
===================
What they really might do
i.e. about 10:1.
bus914 - October 15th, 2013 at 04:13 PM
Yeah I thought that there may be some benefit since Porsche carrera engines were fitted with similar looking ones on the bottom. Considering that the
covers are insulated from the head by a cork gasket there will never be proper heat transfer anyway. Unless the idea is that they start transfering
heat once they get saturated with oil?
68AutoBug - October 15th, 2013 at 04:40 PM
well they do look COOL... lol
I get cool just looking at them...
Mine are higher than normal vw tappet covers , so that high lift ratio rockers etc could be used... the spring bales are about 20mm approx
higher..
VW used chromed tappet covers in scandinavia in the 50s [60s] as the chrome holds the heat... needed in extremely cold weather..
the bails wouldn't transfer any heat so its only cooling the oil that flows onto them...
the push rod tubes were made thin to transfer the heat from the oil as the cooling air from the engine flows over them..
the [hot] cooling air is always cooler than the oil..
LEE
HappyDaze - October 15th, 2013 at 04:42 PM
| Quote: |
Originally
posted by modulus
| Quote: | Originally
posted by HappyDaze
They may increase the 'impression ratio'.
|
I guess that's the ratio of:
What you think they might do
===================
What they really might do
i.e. about 10:1.
|
I was thinking more along the lines of:-
Number of
=========
Number of 
Joel - October 15th, 2013 at 04:44 PM
About the only thing they help is creating more oil leaks.
68BUS - October 15th, 2013 at 05:19 PM
| Quote: |
Originally
posted by bus914
Yeah I thought that there may be some benefit since Porsche carrera engines were fitted with similar looking ones on the bottom. Considering that the
covers are insulated from the head by a cork gasket there will never be proper heat transfer anyway. Unless the idea is that they start transfering
heat once they get saturated with oil?
|
If is was in a porsche it may be more about weight reduction of a few grams. Use the ribs as strength and lose some material out of the channels.
Or they decided it looked good.
Which falls under the 10:1 ratio rule.
vlad01 - October 15th, 2013 at 06:33 PM
| Quote: |
Originally
posted by 68BUS
| Quote: | Originally
posted by bus914
Yeah I thought that there may be some benefit since Porsche carrera engines were fitted with similar looking ones on the bottom. Considering that the
covers are insulated from the head by a cork gasket there will never be proper heat transfer anyway. Unless the idea is that they start transfering
heat once they get saturated with oil?
|
If is was in a porsche it may be more about weight reduction of a few grams. Use the ribs as strength and lose some material out of the channels.
Or they decided it looked good.
Which falls under the 10:1 ratio rule.
|
yep, the ribs for rigidity.
just about every modern synthetic plastic type rocker covers have ribs just like those and that ain't for cooling
AA003 - October 16th, 2013 at 06:43 AM
| Quote: |
Originally
posted by 68AutoBug
VW used chromed tappet covers in scandinavia in the 50s [60s] as the chrome holds the heat... needed in extremely cold weather..
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One for mythbusters.
vwo60 - October 16th, 2013 at 07:38 AM
Until some one actually does a controlled test to determine if they reduce the temperature or not, it is all a guess work.
matberry - October 16th, 2013 at 08:13 AM
| Quote: |
Originally
posted by Joel
About the only thing they help is creating more oil leaks.
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68BUS - October 16th, 2013 at 09:03 AM
Regarding the oil leaks thing. That is a benifit.
Saves time changing oil. Just top it up regularly and it cleans as it goes.
Saves money on oil filters too cause you don;t need to change them.
Geeez, you motorsport guys need to get with the program
HappyDaze - October 16th, 2013 at 09:10 AM
| Quote: |
Originally
posted by 68BUS
Regarding the oil leaks thing. That is a benifit.
Saves time changing oil. Just top it up regularly and it cleans as it goes.
Saves money on oil filters too cause you don;t need to change them.
Geeez, you motorsport guys need to get with the program
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And most importantly, very ENVIRONMENT - FRIENDLY !
The oil is returned to the EARTH....where it came from.
vlad01 - October 16th, 2013 at 11:00 AM
| Quote: |
Originally
posted by AA003
| Quote: | Originally
posted by 68AutoBug
VW used chromed tappet covers in scandinavia in the 50s [60s] as the chrome holds the heat... needed in extremely cold weather..
|
One for mythbusters.
|
no need, its physics. highly reflective metallic surfaces like aluminum and chrome will reduce radiated heat.
look up black body radiation.
try a frying pan thats bare alloy on the bottom and black on the inside. Heat it up nice and hot. hold it out in front of your face. you will feel the
heat blazing out on the black side, turn it around and virtually nothing from the shiny alloy side. Its physics 
BRUTUS - October 16th, 2013 at 02:25 PM
I used to roughen and then paint my aluminium ones black, but was regarded by most as somewhat eccentric...
Craig Torrens - October 16th, 2013 at 02:30 PM
| Quote: |
Originally
posted by HappyDaze
And most importantly, very ENVIRONMENT - FRIENDLY !
The oil is returned to the EARTH....where it came from.
|
AA003 - October 17th, 2013 at 06:29 AM
| Quote: |
Originally
posted by vlad01
| Quote: | Originally
posted by AA003
| Quote: | Originally
posted by 68AutoBug
VW used chromed tappet covers in scandinavia in the 50s [60s] .
|
One for mythbusters.
|
no need, its physics. highly reflective metallic surfaces like aluminum and chrome will reduce radiated heat.
look up black body radiation.
try a frying pan thats bare alloy on the bottom and black on the inside. Heat it up nice and hot. hold it out in front of your face. you will feel the
heat blazing out on the black side, turn it around and virtually nothing from the shiny alloy side. Its physics
|
Nothing to do with physics. Read again.
vwo60 - October 17th, 2013 at 08:51 AM
I powder coat all my alloy tappet covers flat black, do not have a leak on any of mine, use the correct size orings under the head of the bolts that
hold them on, make certain that the bolts have a unthreaded section under the head for the oring to seal on. replacement orings are avialable from any
bearing place, i cannot comment on the bale type alloy tappet covers as i have never used them.
vlad01 - October 18th, 2013 at 08:40 AM
| Quote: |
Originally
posted by AA003
| Quote: | Originally
posted by vlad01
| Quote: | Originally
posted by AA003
| Quote: | Originally
posted by 68AutoBug
VW used chromed tappet covers in scandinavia in the 50s [60s] .
|
One for mythbusters.
|
no need, its physics. highly reflective metallic surfaces like aluminum and chrome will reduce radiated heat.
look up black body radiation.
try a frying pan thats bare alloy on the bottom and black on the inside. Heat it up nice and hot. hold it out in front of your face. you will feel the
heat blazing out on the black side, turn it around and virtually nothing from the shiny alloy side. Its physics
|
Nothing to do with physics. Read again.
|
wtf? 
it has everything to do with physics.
everything single thing in the universe is govern by physics.
Hello... wake up!
bajachris88 - October 18th, 2013 at 09:16 AM
He's talking about Scandinavia in the 50's.
A physics text book doesn't have a formula to determine that
Sociology is a different science altogether.
AA003 - October 18th, 2013 at 07:12 PM
By George he's got it!
Bizarre - October 18th, 2013 at 08:58 PM
where is Baja Wes when you want him ???? 
68AutoBug - October 18th, 2013 at 10:53 PM
Maybe its sciencetology ... lol
well if the alloy tappet covers are painted matt black...
I believe it will make no difference.....
there are many people who believe flat black paint will work wonders with heat..... just spray it on...
I believe I may have painted My cylinders SILVER with hi temperature paint...
the push rod tubes are painted silver. [metallic]
cheers
LEE