• Welcome to Overclockers Forums! Join us to reply in threads, receive reduced ads, and to customize your site experience!

need clarification from block design folks

Overclockers is supported by our readers. When you click a link to make a purchase, we may earn a commission. Learn More.

Mikoto

Registered
Joined
Jul 2, 2002
I just got a guy at a commercial warehousing project I manage to let me have access to his drill press. It is really BIG and cool looking:D I may soon have access to a mill but I'm not holding my breath, and wouldn't know what to do with CAD anyway.

I want to start playing around with block design. I don't have any really good ideas yet, I would just like to try to get a couple of functional waterblocks under my belt for the time being.

I want to know about the characteristics of heat transfer in alluminum relative to copper. In other words, is it reasonable (accurate?) to assume that a block that performs well, made of alluminum will also perform well(predictably) when constructed of copper. Can one predict, based on the conductivity of the substance how those numbers will shake out?(e.g. core temp. Al block=40C yields core temp. Cu block=35C; all other variables being equal)

Please forgive my lame attempt to clarify as I don't have to slightest bit of engineering expertise. If it is still unclear tell me so and I will try again.

The reason I ask at all is that I would rather ruin a whole mess of alluminum than a whole mess of copper;) Preferring instead to make several Al blocks leading to one Cu block.


thanks
 

NeoMoses

Member
Joined
Jul 7, 2001
You are very wise, my friend. Yes, you can expect similar results from aluminum and copper. For example if you make 3 different blocks out of aluminum, the best performing Al block will also be the best performing Cu block. (All else equal).
I'll try to find some numbers or equations relating Temps with al to temps with copper.
 

JFettig

Hey! I showered! Senior
Joined
Jan 5, 2002
Location
MN
another copper vs al
al is tons easier to machine, tons cheaper, your temp idea is about rite

only use aluminum if you have other aluminum components(radiators, other blocks) otherwize use copper...
 

Albigger

Member
Joined
Sep 22, 2002
maskedgeek said:
another copper vs al
al is tons easier to machine, tons cheaper, your temp idea is about rite

only use aluminum if you have other aluminum components(radiators, other blocks) otherwize use copper...

i agree, but even if you do have a copper rad i would still make test blocks out of alum. and test for a week or so (long enough to get a sense of how it performs). this should be fine (as far as corrosion goes). Then when you settle on a design make it out of copper
 

EgeWorks

Member
Joined
Aug 3, 2002
Location
Melbourne, Australia
I'v had a Cu rad and an Al block running for months - no prob with corrosion, just a little additive. But my next set of blocks will be Cu just to be safer + they look prettier than Al.
 

EgeWorks

Member
Joined
Aug 3, 2002
Location
Melbourne, Australia
Car antifreeze ~5 -10% = Ethelene Glycol + Boron. I can't get water wetter where I am but it is supposed to be good too.

This stuff is only an inhibitor - theoretically there will still be corrosion/deteriation, but it is very slow.
 

NeoMoses

Member
Joined
Jul 7, 2001
I have found that Dex-Cool (orange anti-freeze) actually inhibits corrosion better than water wetter. I came to this conclusion after putting non-anodized aluminum tops on copper blocks and running them both for 2 weeks. After 2 weeks, the Dex-Cool hoses were still clear and the hoses in the system with water wetter were completely coated with corrosion. In both setups, the system was completely closed and distilled water was used.
 
OP
M

Mikoto

Registered
Joined
Jul 2, 2002
Thanks for all the replies guys.

I just didn't want to pick poor designs due to variance in conductance.

I'll report back if I actually make one work:D

EDIT: thanks for pointing that out Masked, thats especially important to me as I have never machined anything.
 

Since87

Member
Joined
Jul 30, 2002
Location
Indiana
NeoMoses said:
I have found that Dex-Cool (orange anti-freeze) actually inhibits corrosion better than water wetter. I came to this conclusion after putting non-anodized aluminum tops on copper blocks and running them both for 2 weeks. After 2 weeks, the Dex-Cool hoses were still clear and the hoses in the system with water wetter were completely coated with corrosion. In both setups, the system was completely closed and distilled water was used.

Great info. Thanks for passing that on.
 

JFettig

Hey! I showered! Senior
Joined
Jan 5, 2002
Location
MN
i ran my s-type proto for like 2 weeks, it had some corosion(no inhibitors)
 

utabintarbo

Registered
Joined
Aug 4, 2002
Location
Michigan
NeoMoses said:
You are very wise, my friend. Yes, you can expect similar results from aluminum and copper. For example if you make 3 different blocks out of aluminum, the best performing Al block will also be the best performing Cu block. (All else equal).
I'll try to find some numbers or equations relating Temps with al to temps with copper.

While not totally accurate theoretically, it will be close enough for your purposes.

This was the subject of much debate on another forum (I'm sure maskedgeek remembers :rolleyes: ) with the conclusion (if any) stated above. It will do, given the tools you have access to now...

Bob