Are Euro-cams different from US-cams for 3.0 liters??

[Gunter]

Here are some numbers for L and R Euro cams measured by someone who wants to sell them.
The measurements I took from a set of US-SC Cams are different.
Also, the 930-numbers don't bring up anything on Pelican.

’83 SC Euro Cams:

93014710
Bearing Diameter 48.92 all
intake cir. 31.26 all
intake height 38.53 all ??
exhaust cir. 31.26 all
exhaust height 39.56 all ??

93014810
Bearing Diameter 48.92 all
intake cir 31.26 all
intake height 39.56 all ??
exhaust cir. 31.26 all
exhaust height 39.53 all ??

Are these cam-measurements correct for Euro-cams?
Is there a difference between Euro- and US-cams for SC's?

Much appreciated.

[Bill Verburg]

Whatever the market, whatever the MY, all 3.0 cis and 3.2 Motronic n/a cams are the same.

[ChrisBennet]

Originally posted by Bill Verburg
Whatever the market, whatever the MY, all 3.0 cis and 3.2 Motronic n/a cams are the same.

.. are the same profile.
The sprocket retaining hardware (big nut vs bolt) changed around '81 I think.
-Chris

[Gunter]

Thanks for the replies.
When I compare the measurements from the above Euro cams to my stock US cams, I come up with quite a difference.
As you can see above, there is something not right with the lobe heights; the intake lobes should have a higher lift then the exhaust lobes.
Also, why do the 930-numbers not bring up any info?
Does anyone have the actual measurements for an unmolested stock cam for comparison?

[Jim Williams]

Based on what I remember about the cam numbers, there are 3 digits left out of the numbers you give. I think the proper numbers would have a "105" inserted thusly:
930.105.147.10, etc. I believe the .10 was the later cam (cam bolt) and the earlier had a .08, for the cam nut version.

I didn't look this up, it is just what I seem to remember.

[Grady Clay]

Jim is absolutely correct.

Due to the limited space on the end of the cam, Porsche left out the “105” since you were obviously looking at a camshaft.

Good point.

Best,
Grady

[Gunter]

Thanks all.
What I need is the actual measurements of a stock cam because the SC-cams offered for sale to me may have been reground.
Does anyone have some numbers?
Base circle: xxxx?????
Lobe heights:
Intake: xxxx????
Exhaust: xxxx????
Bearing dia.: xxxx????

Much appreciated.

[Jim Williams]

Gunter,

The numbers on a stock cam should appear on the shaft of the cam, as cast numbers. If they don't , they probably have been ground off.

That said, I have a set of SC cams which I believe to be unmolested. Here are the numbers I measure on the :

Bearing diameter................................ 48.95
Base circle......................................... 32.09
Exhaust lobe height (incl base circle).... 39.87
Intake lobe height (incl base circle)...... 38.95

Numbers rounded to nearest 0.01 mm.

Now I'm not a cam expert, but I don't think these numbers, that is your numbers compared to my numbers, would tell a complete story regarding whether or not the cams might be ground to the same or a different profile. A small base circle, combined with a smaller lobe height, could produce the same lift at the valve as a larger base circle and greater lobe height.

For example, on your cam, difference in the exhaust lobe height and base circle is 8.30 mm, while my cam shows only 7.79 mm.

What one would need to do to get a more accurate picture of the lift would be to put the cam journals in V-blocks and use a dial indicator to measure the lift -- lobe height above the base circle.

Perhaps someone like "camgrinder" John Dougherty could provide better insight to your question.

[Gunter]

Many thanks, Jim

[camgrinder]

Gunter, It looks like your cams have been reground. The smaller base circle is the first clue.
The numbers Jim posted are correct for the SC, but the intake is taller vs. the exhaust lobe. The SC/Carrera cams average .306" lobe lift on the intake side , and .270" lobe lift on the exhaust side.
I would look for something stamped on the back of the cam. I am sure they have been reground.

[Gunter]

Thanks John: These cams were offered to me as SC-cams but the measurements made no sense. Before buying, I decided to be sure and asked the seller to have the profile confirmed by going to a "Cam Doctor".
Yes, there are other markings on the cams which indicate an individual cam shop. As I understand it, there are no standards for marks; each shop has there own markings???

[camgrinder]

Yes the markings vary from company to company. If you post whats stamped on them, I might be able to decifer them.

[Gunter]

Seller is not completelysure but this is what he gave me:

There are other numbers on the cams.
The 810 cam is hard to read. it looks like 9301061469R. There is another mark that looks like Y02.
Other marks on 4 separate raised cicles 1 9 C 2 The 710 has 9301051479R.
Than maybe LY01 and the 4 raised circles with what looks like 0 2 D 2.

[camgrinder]

Those look like casting numbers. What I am looking for is something stamped on the end of the cam opposite the timing gear end.

[Gunter]

I'll try to get those but the seller may have gotten cold feet.

[Stophos]

The seller, me, hasn't gotten cold feet I am on vacation until the 17th of April as he told Gunter in my last email. I mentioned that I might have someone back home that could have them re-measured by a qualified shop but it turns out that I don't have anyone back home that can handle it at the moment. If anyone is really, really curious you can buy them ($125.00) and I will ship have them shipped immediately. Also as I told Gunter the lobe measurements may be reversed (intake & exhaust) although I don't know if that changes anything.
See the original 4 sale post here: http://forums.pelicanparts.com/showthread.php?threadid=274679

Thanks - Chris
giuffrec@aol.com

[Gunter]

Take it easy, Chris.
The lobe-measurements are screwy even when reversed.
I did send you an E-mail early this morning explaining that I am still very interested but we have to know what type of cams they are.
Without knowing, the money means nothing.
Why would anyone buy cams without making sure about the profile?
You offered them as SC-cams but, they are not SC-cams as John points out above.
Imagine if someone bought them and find out later that they are not suitable. Please, get real.
Any dealership in your area can point you to a cam-shop to find out the grind as I suggested a couple times.
It is up to the seller to make sure about what exactly is being offered.
Will you call around in your area and find a shop?
Or are you hoping that someone will buy the cams just blind?

[Stophos]

Did my post come off too strong or angry?? Sorry if it did. The suggestion that I would hope that someone will by the cams on the blind sucks. But I am sure Gunter misunderstood my post and intentions so no big deal.
-Chris

[camgrinder]

If you like I will measure them for free... all you have to pay is shipping.

[cab83_750]

John,

You should pass.....it was your devil post (666)!!!!!

Just kidding and trying to ease this thread.