So I'm installing the kit available from CB and ACN (maybe others).
http://www.cbperformance.com/ProductDet ... tCode=2183
http://vwparts.aircooled.net/CPR-s-12V- ... on-kit.htm
What do people do to seal up that big hole around the pulley?
Max
Alternator
-
Max Welton
- Posts: 3025
- Joined: Mon Jun 03, 2002 12:01 am
Alternator
You do not have the required permissions to view the files attached to this post.
Last edited by Max Welton on Mon Sep 07, 2015 3:40 pm, edited 1 time in total.
-
Max Welton
- Posts: 3025
- Joined: Mon Jun 03, 2002 12:01 am
Re: Alternator
Also, I need a heavy-gauge ring connector. My 68 type-3 generator took a large spade.
What gauge is the heavy wire?
Max
What gauge is the heavy wire?
Max
-
aircooledtechguy
- Posts: 1709
- Joined: Sun Oct 28, 2001 1:01 am
Re: Alternator
Isn't that area technically before the fan?? There shouldn't really be a huge amount of pressurized air on that area of the shroud to worry about. 'Course I'm not running a type3 motor so YMMV. . .
-
Max Welton
- Posts: 3025
- Joined: Mon Jun 03, 2002 12:01 am
Re: Alternator
Yes, that part of the shroud is low pressure air on it's way into the fan. If that space is unsealed warm air from under the deck is pulled into the cooling system. Probably not much of a problem when moving, but if you stop, that upside-down tub that is the engine bay fills with hot air.
Max
Max
-
Max Welton
- Posts: 3025
- Joined: Mon Jun 03, 2002 12:01 am
Re: Alternator
So the alternator is in and the wiring mods complete. The car has been down for three weeks but it fired at the first hit of the key. Bus voltage went straight to 14 at 1000 engine RPMs as seen by the MS2.
I haven't done anything yet to fill the big gap around the pulley. I will probably fab something but will be watching temps closely in the meantime.
I am also a little concerned with the belt tension. It seems a little tight at the limit of adjustment. I am used to running the stock belt a little looser, but the stock pulley is larger than what came on the alternator.
I haven't done anything yet to fill the big gap around the pulley. I will probably fab something but will be watching temps closely in the meantime.
I am also a little concerned with the belt tension. It seems a little tight at the limit of adjustment. I am used to running the stock belt a little looser, but the stock pulley is larger than what came on the alternator.
-
Piledriver
- Moderator
- Posts: 22753
- Joined: Sat Feb 16, 2002 12:01 am
Re: Alternator
The T4s have a filler piece there around the alt, would be too big for that alt/hole, but may provide some ideas.
It is actually setup to seal around and draw air through the alternator, which has forced air cooling from the fan housing on the other end.
If your setup is also blowing into the alt it may be a feature to "seal" it in a similar fashion, allowing airflow through the alt, and only through it, works as something of a dynamic seal while better cooling the alternator..
It is actually setup to seal around and draw air through the alternator, which has forced air cooling from the fan housing on the other end.
If your setup is also blowing into the alt it may be a feature to "seal" it in a similar fashion, allowing airflow through the alt, and only through it, works as something of a dynamic seal while better cooling the alternator..
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
-
Max Welton
- Posts: 3025
- Joined: Mon Jun 03, 2002 12:01 am
Re: Alternator
So here's a note for others thinking about this kit.
It comes with a 10 x 965 belt. I got the belt on, but it was fiddle-tight. Tight enough that there was a thrumming sound coming from the engine. Tight enough to change the gap between the VR sensor and the fan-mounted trigger wheel. It was giving my sync losses until the belt got some heat in it.
So I tried a 10x1005 (Napa 25 7390). It was way too loose and slipped a little. But the funny noise and the sync hits were gone.
Now I have a 10x980 (Napa 25 7380). The alternator is at the extreme lower end of the adjustment range of the bracket but the tension seems reasonable. Maybe a 10x990 would be just right.
Max
It comes with a 10 x 965 belt. I got the belt on, but it was fiddle-tight. Tight enough that there was a thrumming sound coming from the engine. Tight enough to change the gap between the VR sensor and the fan-mounted trigger wheel. It was giving my sync losses until the belt got some heat in it.
So I tried a 10x1005 (Napa 25 7390). It was way too loose and slipped a little. But the funny noise and the sync hits were gone.
Now I have a 10x980 (Napa 25 7380). The alternator is at the extreme lower end of the adjustment range of the bracket but the tension seems reasonable. Maybe a 10x990 would be just right.
Max