Cam Shaft Identification - Alfa Romeo Bulletin Board & Forums

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post #1 of 20 (permalink) Old 04-18-2017, 08:44 PM Thread Starter
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Cam Shaft Identification

I have 2 cam shafts, in one box, came as spare parts.
The car has a 2000cc SPICA engine in it.

Can anyone help identify them from the tag on the box?



How do I tell which one is for exhaust, and which one is for intake?

1968 1750 Berlina, 1973 2000 Berlina
1978 Alfa Romeo 116 Alfetta Sprint Veloce 2000 GTV/4, 1978 2000 Spider
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post #2 of 20 (permalink) Old 04-18-2017, 09:41 PM
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If your cams are in fact 4 cylinder Alfa cams there was no difference between the intake and exhaust cams on all production 1300/1600/1750/2000 models.
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post #3 of 20 (permalink) Old 04-18-2017, 10:55 PM
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I don't know but on my 'slightly' modded 2 litre ASP is marked on the intake cam and SCAB on the exhaust cam... no idea if stock cams are identical on intake and wxhaust but you may want to check the part number stamp on the cams themselves, as it makes a huge difference in determining valve gaps (45/50 on stock, 25/30 on my gta cams... learned the difference the hard and expensive way)




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post #4 of 20 (permalink) Old 04-19-2017, 08:49 AM
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Check the end (butt) of the cam for marking.
However the distinct white reflection on the scab cam likely indicates a "closing ramp". if you can feel it with your finger that will confirm it.

Typically reground cams such as these do not have a closing ramp and lash is specified tighter (.008 - .014) than those with a closing ramp (.016-.018).
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post #5 of 20 (permalink) Old 04-19-2017, 10:18 AM Thread Starter
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I was hoping someone could read the hand written Italian on the label.

I did not see any markings or casting numbers on the cams.

I'll take more pictures of the cams themselves, in a couple hours.

I suppose I could put the cam in a couple of v-blocks, and use a dial indicator, and measure exactly what they are?
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1968 1750 Berlina, 1973 2000 Berlina
1978 Alfa Romeo 116 Alfetta Sprint Veloce 2000 GTV/4, 1978 2000 Spider
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post #6 of 20 (permalink) Old 04-19-2017, 11:06 AM
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Marks are 34-64-64-34 degrees.
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post #7 of 20 (permalink) Old 04-19-2017, 11:13 AM Thread Starter
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Quote:
Originally Posted by 101/105guy View Post
Marks are 34-64-64-34 degrees.
Thank you!

1968 1750 Berlina, 1973 2000 Berlina
1978 Alfa Romeo 116 Alfetta Sprint Veloce 2000 GTV/4, 1978 2000 Spider
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post #8 of 20 (permalink) Old 04-19-2017, 08:33 PM Thread Starter
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OK, found the stamp, and it matches the "PROFILO", profile: 12N2

What does this profile translate to?
Good for street/road/track, or is it max power output at the high rpm range for full race?

Are these cams usable for daily aggressive driving with a SPICA engine?

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1968 1750 Berlina, 1973 2000 Berlina
1978 Alfa Romeo 116 Alfetta Sprint Veloce 2000 GTV/4, 1978 2000 Spider
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post #9 of 20 (permalink) Old 04-20-2017, 01:08 AM
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Interesting......
I have a pair of 11N2 cams. 11 being the lift in mm.
12mm lift is a bunch unless clearances have been checked.

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post #10 of 20 (permalink) Old 04-20-2017, 05:39 AM
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SCAR is exhaust, isn't it? ASP something would be intake.
12mm seems a lot of lift on a street engine. Centerline's stock cam specs shows the highest stock cam lift as 10.1, on 10548 cam. 2 more mm is .080" roughly. That's a lot. You'd need to check piston/valve clearance, and make sure the lobes didn't hit the lifter bores.

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post #11 of 20 (permalink) Old 04-20-2017, 09:03 AM
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Quote:
Are these cams usable for daily aggressive driving with a SPICA engine?
No, both inadequate fuel delivery, and 12mm lifts require head modifications, springs, and short guides.

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post #12 of 20 (permalink) Old 04-20-2017, 10:05 AM
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wwhite...this might be relevant or might not be but "SCAR" was a dealership/race team in the Tuscany area of Italy that successfully campaigned its Alfetta GT track cars in the touring car series in Italy in the 1970s, which might suggest that the cams with that name are strictly race cams
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post #13 of 20 (permalink) Old 04-20-2017, 10:17 AM
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...also regarding the Italian translation since I speak Italian:

fase disctribuzione ...............cam timing

aspirazione ........................intake cam

inizio prima del pmi .............initial before top dead centre

fine dopo il pmi..................final after bottom dead centre

scarico.............................exhaust cam

gioco punterie ...................tappet clearances
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post #14 of 20 (permalink) Old 04-20-2017, 10:18 AM
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... typo......meant to write inizio prima del pms
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post #15 of 20 (permalink) Old 04-20-2017, 11:15 AM
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By the way....
these cams are not regrinds like the ones sbadaro shows.
New, machined from billets and heat treated, just like Formula 1 motors!
Will not work well with a stock Spica pump or with stock set up.

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