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924RACR · Posted: Thu Jul 12, 2007 10:12 pm Post subject: Camshaft ID - early vs. late?

Anyone know how to tell the difference between early vs. late camshaft? I've got a few laying around, want to make sure I don't get that crappy emissions cam from the early cars in there. Presumably a number on the cam should correspond?

I doubt I have an early cam, really, but would like to make sure!!
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
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Smoothie · Posted: Fri Jul 13, 2007 1:09 am Post subject:

Allegedly, a number starting with 047_ may indicate the early cam and 046_ the later one. For additional vagueness and confusion look here - http://www.924board.org/viewtopic.php?t=8895
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endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Just put a caliper accross the lobe and the short ones are the early ones.

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

924RACR · Posted: Fri Jul 13, 2007 1:33 am Post subject:

Works OK unless mine are all one type! Well, I suppose except to cross-check against what's already in the car...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Allright, I went out and measured them. The little one is 1.98" and the big one is 2.04".

Man, what a pain

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

924RACR · Posted: Fri Jul 13, 2007 11:12 pm Post subject:

Thanks, dude!!

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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

924RACR · Posted: Sat Jul 14, 2007 11:15 pm Post subject:

Thanks Smoothie and Todd - sure enough, I've got one of each. One is an 047, looks to have the smaller lobes, and a 046 with apparently bigger lobes. Then there's one in the head (spare head which I'll be building), also looks like an 046 late cam by measuring the lobes.

Easiest would be to simply re-use my existing cam, but I believe it has some damage to some lobes, which will hurt efficiency a little! That plus I have I think some damaged lifters which could use to be removed from the rotation, no pun intended...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype