911 Cooling Shrouds - Improving Internal Air Distribution

[Tony Z]

Wally

What are the chances that you got a picture of that shroud from the front? (where you mount the fan, looking into the shroud)

[eugene]

This is the inside if a Klaus shroud with the air distributor.

[Wally]

Very cool Eugene!

By the looks of it, you also have the special welded-up heads from Rolf Klaus!
Could you give more info on these heads and what motor you use them on?

What version of the Klaus cooling system is yours?

Thanks,
Walter

PS Sorry , don't hav emore pics or info on the GWD type 1 shroud, but its around for quite some time now..

[eugene]

Hi wally. No this are not my engine. Is a picture Klaus has send to me to help me with the shroud installation. He did not have the english instructions made jet when i received the shroud. I dont know a lot abouth his heads other that that can be seen from the pictures from his catalog. But he claims he is near the 100hp/l. I also noticed the fins on the top off the heads in this picture. Above the plug. They seems longer that the fins from some other pictures of his heads. Probably machined from a small block of alu and welded on top for strenght. He also uses the additional fin like other german tuners. But he don't use the GB plug position and he wrote: ''Because of to much differences between the compared engines, I could not
yet find out till today, if there is a gain of torque or power output using the GB heads. But they will get a crack to both sides of the spark hole after some
time.'' I think his chambers are reshaped. At least as much i can judge from the pictures.
I have the 3rd version of his shroud but i did not buy the RSK. I was considering it but he said that there is too much work on the heads to carry it by myself and had not any instruction written couse no one have bought the RSK in order to instal it be himself and that it will interfer with ordinary aftermarket exhaust like BAS,... He said the RSK is working great and he is using it for engines from 2.4 and up and really make a difference when driveing top speed for long time.
The pieces i have brought from him are indeed top quality and he was also kind to answer to all (dumb) questions a made.

I will take some better pictures of the shroud when i will home. I dont have any on the comp.
The engine will be a 100x71 with the NOS mahle nicasil i have posted pictures on the STF some time ago. I have Thorsten lifters -thanks for the link BTW. AMC new castings reworked by me with 44x38 valves and some moods to the chamber. I don't know for the cam yet I have a cheap USA 298° but i would like a split duration-lift. I would buy one from klaus but are crazy expensive and he is not selling cams alone. Rammele had some split cams listed if i remember correctly, but not any more and is difficult to get anything from him. I'm not fan of the Shlecher- no enough lift. And sure don't want to buy the whole cam package for a RAT cam- but would love one. So any options to get a split duration-lift from europe? Do you know anyone who will grind a custom one?

Sorry for the off topic. I will pay off wit some pictures when i get to my shroud.

Best Regards

[Wally]

Thats excellent Eugene!
I thought I recognised his heads from your pic
The measurements he takes with his heads (which you mentioned) do concur with his cataloque writings and website

I remember (yeah, I know..) that Wilke Tuning from germany used to make and advertise split-duration cams. Not sure if they still exist tho. Site hasn't been updated for ages...
http://www.wilke-motorenbau.de/index.htm

But the most available are the split duration/lift cams from webcam and they also make you a custom split-duration/lift at a very small extra cost. You can contact them directly or order a custom one throught aircooled.net.
My turbo engine will use a custom webcam with Thorsten lifters. I have good faith that combo will live a long life, but as always, no guarentees...

Greets,
Walter

[eugene]

As promised- pisc of the klaus shroud of the 3rd generation. Note the complex shape on the back plus the mentioned internal air distributor. Sure some development went into this. The shroud uses a smaller porsche turbo like fan. 225/250mm diameter.

[Bad bug]

Eugene does you fan ring carry this code 901 106 101 5r on the fan ring. Why i am asking is because i think i have a turbo 911 fan and i am not sure. Also i need to change the fan it has some of the blades with cracks in them.