Hot VW's Article Titled "Cooling Solution"

[rockerarm]

Hello all. Hot VW's magazine ran this 1 page tech tip article in Aug 2010. Basically, it evolved around a bone stock 1600 dual port engine that was experiencing elevated cylinder head temps that pegged the 340 degree Auto Meter gauge. Their conclusion was the aftermarket cylinder heads were plugged with casting material and nearly non existent.
My question is has anyone experienced this?
Thanks in advance, Bill.

[Erik G]

just looking at cylinder heads, they almost all need to be cleaned of casting flash all over. The new CB's look really nice
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[Danwvw]

How hot did the heads get after opening the holes?
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[rockerarm]

Hi. The article stated that after their repairs the cyl head temp dropped to a maximum of 260 degrees, a decrease of 80 degrees.
Bill

[Danwvw]

It's hard to believe that drilling out gaps between fins alone could make such a difference. Was there something else also done?
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[skills@eurocarsplus]

[Erik G]

[Mr.Duncan]

That's why I HATE when a customer gives me an EMPI HEAD

100% blocked. Not even joking.

Useless.

(well you can drill them to make them flow again)
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[Zundfolge1432]

Go back to my engine build thread "mystery engine" you'll see me shining a light through the fins as well. Stock heads are usually good but sometimes become blocked with dirt and oil and or a careless job of cleaning. Good idea to restate this, it's little things like this that are sometimes overlooked.

[ALB]

[Dan Ruddock]

The exhaust of the cooling system is just as important as the intake. If the airspeed is too high around the head because most of the head is plugged up the air does not have enough time to pickup the heat as effectively.

This is common sense folks.

Dan

[richparker]

[Danwvw]

There sure are some misconceptions of the laws of thermodynamics here on the samba. This is not the first time I've run into odd thinking when it comes to head temperature. But Yes not talking about holes If they drilled holes and got lower head temps then that's real data.
(This head first photo below) I would think would run cooler in the center than the others above:
Why? Because the cold intake manifolds are cast with more direct contact to the rest of the head than the other two above.
Now that being noted! look at the area around the exhaust ports. This is where heads are the hottest so air movement through and around those exhaust ports is really important. And this would make the Panchitos and the Stock heads the winners for perhaps more uniform cooler temperatures. Air moving between the intakes would make little difference. Well it may help a little when coming off the freeway and coming to an idle when there is little evaporative cooling in the intakes. And unless your in a rocket ship or doing Mach 2 or something air moving around the surface is going to cool more the faster it is moving. I would bet that the stock head cools best. longer fins! (At least they look longer to me and maybe follow the curve of the chamber better) but without holding a Panchito 44 I can't be sure. Someone needs go get some data about the Panchito heads and post it. So much depends on how rich or lean the engine is running though it may make fin cooling not as big a factor as the main jetting being a little too lean causing heating.

Below are stock vw 311 heads and I will be happy to post more photos and measure the fins on them if anyone is interested.
More on them here: Are these 311 heads any good?

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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[DesertBob]

What are the best tools to use to clean up the flashing? My heads are really ugly.
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74 Super Beetle (German Look Project)
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[Glenn]

[mondshine]

Glenn-
That's because the food stylist that assembled that Whopper makes 5-10K a day!
Very different than the kid with pimples on his face who makes yours.

They will go through cases of buns, for a "perfect one", then super glue on extra sesame seeds where they're skinny.
A case of tomatoes might yield 5 perfect slices...
Well you get the idea

[Glenn]

[Erik G]

[Pat D]

That picture is from an off the shelf Panchito Glenn, they all look just as clean as that one.
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Pat, Im too fast slow me downs!

[Glenn]