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Camshaft Pulley Key/Dot

 
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Joined: 18 Sep 2013
Posts: 118
Location: Scotland

PostPosted: Mon Dec 09, 2019 11:55 pm    Post subject: Camshaft Pulley Key/Dot Reply with quote

I have put my camshaft pulley on backwards. It has been running like this for a long time with the indented dot lined up with the cam cover pointer and the flywheel on the zero mark.

Now I just found out that the dot should be on the back (closest to the pointer) of the pulley, not the front!

Can anyone confirm if the camshaft pulley woodruff key and TDC dot are either in line with each other or 180 degrees out from each other (ie, it doesn't matter if it's backwards) or if I need to redo my pulley and valve timing.




The most helpful thing would be a photo of a 924 camshaft pulley from the side with the dot, showing the position of the key slot and the dot.
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1981 N/A daily driver.
Modifications: Headlight relays. Vacuum gauge. Cold start switch. Kill switch. Ported cylinder head, intake and exhaust. Brake booster venturi delete. 53/35mm throttle body. M62 supercharger mounted but not connected
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Joined: 18 Sep 2013
Posts: 118
Location: Scotland

PostPosted: Tue Dec 10, 2019 2:03 am    Post subject: Reply with quote

Found images.




So there are indented dots on BOTH sides, but not in the same place!

The one in line with the keying groove must be the timing dot. Thus it doesn't matter if the pulley is on backwards as it will always end up in the same place.
_________________
1981 N/A daily driver.
Modifications: Headlight relays. Vacuum gauge. Cold start switch. Kill switch. Ported cylinder head, intake and exhaust. Brake booster venturi delete. 53/35mm throttle body. M62 supercharger mounted but not connected
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scm924s  



Joined: 22 Oct 2010
Posts: 226
Location: Gloucester UK

PostPosted: Tue Dec 10, 2019 3:03 am    Post subject: Reply with quote

You will find 924 owners over here who have supercharged their cars and may be interested in your cars development.


https://porsche924.co.uk/
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1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold
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Euro924S2  



Joined: 06 Mar 2008
Posts: 182
Location: UK

PostPosted: Tue Dec 10, 2019 6:18 am    Post subject: Reply with quote

Thanks Stan. I didnít notice that in his signature until you said! I ran an M62 on my 924 for a few years before more recently swapping to an m90. Worth noting at this point though Iím yet to make any more power with the M90 so the more efficient m62 was plenty!

Glad you found the answer to your question about the cam. Tbh though, if itís running then it must be right as cam timing canít be more than a couple of teeth or so out until it dramatically affects the running.
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
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Euro924S2  



Joined: 06 Mar 2008
Posts: 182
Location: UK

PostPosted: Tue Dec 10, 2019 6:19 am    Post subject: Reply with quote

Edit....turns out my signature on here is so out of date it still says I have a M62! That was about 6 years ago it changed to M90!
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
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Raize  



Joined: 18 Sep 2013
Posts: 118
Location: Scotland

PostPosted: Tue Dec 10, 2019 6:48 am    Post subject: Reply with quote

Euro924S2 wrote:
Thanks Stan. I didnít notice that in his signature until you said! I ran an M62 on my 924 for a few years before more recently swapping to an m90. Worth noting at this point though Iím yet to make any more power with the M90 so the more efficient m62 was plenty!

Glad you found the answer to your question about the cam. Tbh though, if itís running then it must be right as cam timing canít be more than a couple of teeth or so out until it dramatically affects the running.



Given how well the car was running before with the pulley on backwards it's not surprising that it can go on both ways. The belt would probably be more central with the pulley on the right way round, but it doesn't overhang, so... who cares.

As for the supercharger, it's rather delayed by the sorry state of the rest of the car unfortunately.
_________________
1981 N/A daily driver.
Modifications: Headlight relays. Vacuum gauge. Cold start switch. Kill switch. Ported cylinder head, intake and exhaust. Brake booster venturi delete. 53/35mm throttle body. M62 supercharger mounted but not connected
Back to top
View user's profile Send private message
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