#770 (912E) Project thread *Tangerine Cooling System installed!) Options

[Bulldog9]

I'm restoring a 912E, total gut & rebuild. New to this forum, been on the 912 board and several others for a while. I've never worked on an air cooled car engine before, or VW/Porsche of any type, so this has been a real learning process. Been lurking here for a while, figured it was time to post. I've been on 912BBS since 2011, for those interested, this link goes back to day 1. http://www.912bbs.org/vb/showthread.php?43391-770-Update

[Bulldog9]

R&R'd the steering rack and front cross member today, things are coming along! Here is a before & after. Details are on the main build thread. Also test fit the sachs/Boge strut inserts, fit perfectly. Will be cleaning them up over the next few days.

http://www.912bbs.org/vb/showthread.php?43...70-Update/page4

[barefoot]

R&R'd the steering rack and front cross member today, things are coming along! Here is a before & after. Details are on the main build thread. Also test fit the sachs/Boge strut inserts, fit perfectly. Will be cleaning them up over the next few days.

http://www.912bbs.org/vb/showthread.php?43...70-Update/page4

You don't show torsion bars or rear bushings in front A-arms, beware that worn OEM bushings sag and cause bars to rub the ID of the A-arm and create grooves and corrosion pits that may result in fracture of the bars. Replacement of the bushings is easy and should be done if you haven'r already been there.
If the torsion bars have the coating warn away be sure to polish the bars to remove any grooves or corrosion and re-coat.

[Bulldog9]

Snow day today, so I figured I'd try my electric heater box part duex.... Round 1 was ineffective as the stock rear blower was unable to push what I thought was enough air. After looking around I decided to try a larger enclosure and go for a 125CFM 4" fan...

Parts:
4" 12V brushless double ball bearing fan
4" metal electrical box & cover
3" PVC drains (x2)
4" PVC plastic box cut down to 3/4 for spacer
125W 12V heat element

I used my dremel to cut holes in the metal box and cover for the inlet and outlet. The Heat element bolts directly inside the box and air is pulled into the inlet, through the heat element through the fan and out the other end. Because the fan is 4" and the outlet is 3" I had to make a spacer to create airspace for air movement. I cut a hole in the metal plate cover for the box, slipped the drain through the hole. I drilled holes in the fan housing that lined up with the standard cover screws and sandwiched the fan and spacer between the box and cover. JB Weld over any large seams/joints, and then wrapped the whole unit in duct/foil tape.

The result? A solid 10-12 degree raise in temps.... lol. I think the issue is too much fan/air volume and thus too little temperature rise. I imagine pulling air through the tubes from the back of the car will slow the volume down, but maybe not enough. This was one of the reasons I went for a higher CFM fan. I will have plenty of time to play around with the system and will probably put in a variable speed control for the fans. Was a fun snow day project though.

Finished product. Saw a 10 degree rise in the house (70-80). Took the unit out to the garage, let the thermometer settle to 40, ran it for 5 minutes, temp output was 52. clearly not enough. More development to follow.....