TheSamba.com :: View topic - Thing Fan Shroud vs. regular Doghouse Shroud

Tue Feb 24, 2004 7:39 pm

Greetings,

I was hoping somebody could clarify a point for me.

What is the difference between a 'regular' Type I fan shroud with a doghouse oil cooler and a Thing, type 181, shroud? It has a dog house offset oil cooler too, right?

The reason I ask is I'm sloooly gathering parts for a motor, and I'm currently giving thought to how I want to cool the motor.

I've seen some of the recent posts on the subject that Jake (Is that right? the type-IV guy in Geogia?) but I didn't really see the final conclusion to his dyno reports.

I would LIKE to JUST have a dog house cooler with whatever the very best stock fan shroud was. I would like to keep the heater ducts as well.

Comments? I did search a bit by the way, but didn't see this particular point addressed.

-jeffrey

Tue Feb 24, 2004 7:41 pm

I tested them directly against each other... I cannot give any results out till it comes out in Ultra VW...

Not taht big of a difference-

Tue Feb 24, 2004 8:07 pm

Hi, Jake,

thanks for your insanely quick reply!

I'll be on the lookout for that 'Ultra VW' issue. I had to go google the name as I'd never heard of it.

For others in a similar situation (i.e., clueless) I offer this URL:

http://www.chpltd.com/ultra_vw/

I see this is a new publication from the UK publisher CHPublications. I am familiar with one of their other offerings, 'Triumph World', as I also have a '62 Triumph TR4. 'Triumph World' is a nice magazine with good tech articles, though somewhat difficult to find, so I suspect the same will be true of Ultra VW.

Larger newstands do seem to carry 'Triumph World', so I'm hoping the same will be true of Ultra VW.

Thanks for your research on the issue, Jake.

-jeffrey

Tue Feb 24, 2004 8:24 pm

I noticed a oil temp drop when i switched from a stock late model Dog House shroud to a 73 Type 181 shroud.

Nothing scientific, but i do feel mine runs cooler.

BTW... i don't dispute Jake's findings.

Tue Feb 24, 2004 8:37 pm

The only reason to switch to a Thing shroud is to get rid of the heater ducts on an engine without heaterboxes. Since you are running heaterboxes, save your money and use a stock Bug shroud.

Tue Feb 24, 2004 10:14 pm

Did the type 181 Thing not have heater boxes? Thus no heater outlets in the fan shroud?

I saw a picture of some kind of gas heater fitted to the trunk of one once. I thought perhaps that was some sort of additional heat for colder climates.

A good friend in high school had a yellow one and we went everywhere in it. I don't think he had a top (I don't remember it ever being up anyway) so I guess I never considered heat.

Fun car.

-jeffrey

Wed Feb 25, 2004 12:10 am

Jake Raby wrote: I tested them directly against each other... I cannot give any results out till it comes out in Ultra VW...

Not taht big of a difference-

Hey Jake,

I saw that motor you blew in VWT. Good job! Could you give a better story then the one in VW trends? It sounds like you did everything to keep that thing running. Not to change the topic.

Wed Feb 25, 2004 4:06 am

The 1973 VW Type 181 (aka THING) had a Gas Heater. It also had a one year only Dog House fan shroud that did not have fresh air outlets.

Wed Feb 25, 2004 8:37 am

Aren't there after market shrouds that don't have the heater ducts? They're like $40. Why would one search (& pay) for a one year only Type 181 shroud? I'm might be missing something... :?

Wed Feb 25, 2004 8:51 am

Blessed Bus wrote: Aren't there after market shrouds that don't have the heater ducts? They're like $40. Why would one search (& pay) for a one year only Type 181 shroud? I'm might be missing something... :?

It's the whole OEM vs Aftermarket issue.

Wed Feb 25, 2004 9:54 am

Glenn the reason you saw the oil temp drop with the thing shroud is that the scoop that diverts air into the oil cooler housing is more "violent" in the Thing shrouds, as well as the shrouds used on later beetles...

This cools the oil better BUT AT THE SAME TIME ROBS AIR FROM #1 CYLINDER... If you could watch the temps as the changes were made you'd see what you compromised for loweroil temps increased the temp of #1 and also #2 slightly in head temps...

I saw it consistently

Wed Feb 25, 2004 1:58 pm

Jake, how do you modify the Thing shroud to not heat up #1?

Wed Feb 25, 2004 9:53 pm

Trim away part of the scoop and make it more of a reversed airfoil.... But then the oil coling goes down hill....

Wed Feb 25, 2004 11:23 pm

Jake the "violent" oil cooler scoop, is that the curved piece of metal that is behind the fan that appears to direct more air to the oil cooler intake slot?

Some Stock VW's have this metal scoop, and others do not. i assume the ones without the metal scoop do a better job at head cooling, at expense of oil cooling as you said.

Is this the "violent" oil cooling piece??

thanks dave

Thu Feb 26, 2004 7:28 am

Yes, The larger scoop was used on 1971 Bus fanshrouds, and the later doghouses with the Venturi ring in back of them...

Thu Feb 26, 2004 11:52 am

Ok, thanks for the info Jake!

I understand the violent oil cooler scoop, but what is this venturi ring (how to identify???)

also when is the Ultra VW article estimated to be published? I can't wait.

I do not subscribe now, it is a tad bit expensive in the USA to subscribe, best I have seen is about $65 a year (but I am sure it will be worth it with your article) I just don't want to subscribe, and end up having your info published in 13 months, and missing it.

Does anyone one sell single copies in the USA?

anyway, thanks again

dave

Thu Feb 26, 2004 2:14 pm

dave menche wrote:
I understand the violent oil cooler scoop, but what is this venturi ring (how to identify???)
dave

The venturi ring is found on the inlet of the 75-79 FI fan shrouds.

Thu Feb 26, 2004 2:14 pm

dave menche wrote:
I understand the violent oil cooler scoop, but what is this venturi ring (how to identify???)
dave

The venturi ring is found on the inlet of the 75-79 FI fan shrouds.

Thu Feb 26, 2004 2:16 pm

dave menche wrote:
I understand the violent oil cooler scoop, but what is this venturi ring (how to identify???)
dave

The venturi ring is found on the inlet of the 75-79 FI fan shrouds.