924Board.org

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Can anyone who is familiar with the different alternator mounting positions on the 924 N/A lower exhaust side please tell me what model or variation had the alternator mounted further rearward with the belt running about 1"from the timing belt, compared to ones that run about 2" away.
I am guessing it may be on models with aircon?
Is it just a matter of changing the mounting brackets to move the alternator back from its forward position?

Appreciate any info.

Roger

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

None as far as I know.

I can't even imagine how the alternator was moved that way.

Models with air conditioning use the same alternator mounting as models that don't have air conditioning.

This could be someone's idea of a local repair or modification.

Ozzie · Posted: Wed Apr 18, 2007 7:32 am Post subject:

Being from the land os OZ the alt rubbers are different
I got my top rear ones from a suspension place.
4 urethane ones for $26. Only needed 2.
IIRC they were suspension drop link bushes for a toyota landcruiser.

Go to Fulcrum suspension or similar with your old ones.
As for the alt being too far fwd- beats me, mine lines up fine and I have just changed the lower pulley to fit air con.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

leadfoot · Posted: Wed Apr 18, 2007 11:22 am Post subject:

The upper rear bracket has provisions for sliding back and forth as it has elongated bolt holes. The upper front bracket would be different though as it does not have any provisions for moving.
If you want to shift the alts position then a new fron bracket would need to be installed.
Leadfoot
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

1" ahead of the timing belt sounds like the right location to me. Why do you want to move it?
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Thanks guys.
Urethane is the way to go, I`ll look into it.
My top rear mount has no slots and I estimate the holes would be about 25mm offset. Yes Leadfoot, the front brackets are different. I`ve been looking at some pics, there must be at least 2 varieties.
Endwrench`s is mounted back

Mine mounts it further forward, and looks like the waterpump pulley with offset is reversed.

The alternator placement is a critical factor affecting my SC belt drive geometry. I would prefer to run the Alt + WP belt inboard of my SC drive.
Do I just change brackets and what do I ask for when I go shopping?

Cheers, Roger

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Sorry, Roger, your pic links are bad...

SC = supercharger? ...

_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

Ozzie · Posted: Wed Apr 18, 2007 6:07 pm Post subject:

Aussies are RHD and need the alt a bit more fwd tha US models
If the belt lines up vertically with the WP and oil pulley then thats the way they are supposed to be.

_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

The pix were enlarged cropped expanded resized but can you see the difference. SC is my abbreviation of supercharger. I am engineering my blower system and for my application mounting the alternator rearward by 20mm or so has distinct advantages according to my reasoning at this time.
I see the brackets are available.
Leadfoot, you are correct regarding the rear bracket being slotted, now its off I can see it is slotted by 4mm.
Ozzie, Yea RHD, thanks for reminding me.

Is that the dumbarse dregged too many late nites face?
Must admit that factor had me running to the garage to check!
But there`s around 50mm clkearance to the stock manifold and also the steering shaft. I have headers to install and by lining it up visually looks like I`ll have heaps more clearance. ( and steering shaft interference)
I think I will try to get some of the alternative brackets if anyone can tell me what they`re off.

Thanks,Roger

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

A LHD 924 non-turbo ought to do it. Then simply flip the water pump pulley and buy a new lower pulley from the same vehicle.

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Thanx for the pic Ozzie, I`ll swear it wasn`t there last night. It looks the same mount as mine so the variation probably is between RHD and LHD.
Fiat22turbo confirms this, thanks for your input. It`s so good to have info from around the world as the local (350 miles away) Porsche disamantler thought I was on drugs when I enquired about this. Have to buy from the USA.

Thanks guys.

Roger

steeny · Posted: Thu Apr 19, 2007 9:45 am Post subject:

ozzie, that crank pulley looks mighty familiar, but i still dont see an AC belt attached......

RC.. its interesting to note the diffeences between LHD and RHD. if you look up chrenans engine rebuild thread, i'm pretty sure there were some nice pics of the alternator brackets being put back on a basically naked engine. might give you a better idea of whats going on. i'm not sure i can believe that you simply turn the water pump pulley around to make it work.... but i guess anything is possible.

cheers
_________________
1978 924 N/A
she's gone.....

leadfoot · Posted: Thu Apr 19, 2007 10:05 am Post subject:

Well that's strange as they are German cars and they are all LHD...
now who's on drugs....
Fo bushings I cheated and used skateboard truck bushings... 8$ for a pack of 4 in firm or hard.
PET list two bracket part numbers as
20 - 046 903 145 A support /LL
(20) - E 047 903 141 support /RL
I guess these are the euro models...
Leadfoot
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

StienbargerR · Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN

haha, leadfoot, great use of skateboard bushings! That reminds me...my skateboard needs a new set.

Ryan
_________________
1978 924 NA
-250lb lowering springs, Euro Pistons

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Thats exactly what I needed Steeny. Thanx a shipload.

Thats it!
The Oz version has the w/p pulley flipped with a 4mm spacer and a deep (50mm) crank pulley. Phuck nose why.
I`ll get my waterpump pulley turned with PK5 ribs to suit the offset after I get the alt set up. My camry alt pulley is a direct fit on the bosch alt, 17mm shaft and 60mm dia PK5 steel. May get one but probably go alli, 60mm bar is cheap. With a 150mm blower drive it is necessary to go forward to clear the oil pressure relief valve head. With this bracket I can run the alt/wp on the inside with a smaller dia pulley. Sure Leadfoot knows about this. Its critical to work this shit out before I get pulleys machined or establish blower mounting position.
Thanks for your help. Ive posted a want to buy.

Cheers, roger