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I have a "E12" Head running cam bearings...


Ryan_71-02

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Anyone have any objections or problems with running cam bearings? The head had a seized camshaft cut out of it but was amazingly NOT warped. Has anyone else ever run with them? Should I toss it and find another head? Search turned up little mention of camshaft bearings.

Ryan

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We used to do it all the time, as long as the shop makes sure they are secure and aligned you should not have any problems. If it is the center bearing remember there needs to be a oiling hole for the camshaft spray bar.

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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Preyupy,

I'm not trying to hijack this thread, but I just have to ask; is your turbo 2002 the incredible car that was displayed at Griot's?

No amount of skill or education will ever replace dumb luck
1971 2002 (much modified rocket),  1987 635CSI (beauty),  

2000 323i,  1996 Silverado Pickup (very useful)

Too many cars.

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There was a time when you could get a good head for less than the $$$ it took to repair the cam line so there were a lot of them tossed because of that. Now they are worth more and it makes sense to repair them.

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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Where are you ? I have a great shop here that I use for my race heads, the big camshafts need a larger bore for the front and center bearings. They are very used to working on M10 heads now.

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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I used Heads Up in Auburn WA. They are awesome and work on nothing but cylinder heads. They did all the machine work and assembled the head for me a couple years ago. Been sitting in a sealed plastic bag ever since and am just now getting the last of my sidedraft engine parts together for the build. Just want to run into the least amount of problems...

Ryan

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I use Heads Up too, they are the only shop I have found anywhere close to Seattle that can do a good job on the line bore on our heads. One of the problems most shops have is the back bearing bore is a different diameter than the other two and they have trouble indexing to it. I have used them for a number of years and they have been great to work with.

1970 1602 (purchased 12/1974)

1974 2002 Turbo

1988 M5

1986 Euro 325iC

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  • 13 years later...

Hi all,

 

       Old post but same topic.

 

    I have a '76 2002 that has a  89.25mm flat top piston M10 (8:1 compression?).  The head I purchased used was said to have been prepped by TEP. It has very large lift unidentifiable cam. Lobes like Ostrich eggs.  The cam bores are larger for it so my stock #5 Albrex cam won't fit.  The big cam doesn't play nice with the lower compression.

 

Can someone recommend a fix? I'm thinking to regrind the big cam to a mild spec. 

 

Can someone recommend a reputable shop to do this and also not break the bank?

 

Thanks, Tom

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Were your original pistons flat-tops?  Or... were they changed to flat-tops to accommodate the "ostrich egg" cam?

The '76 standard piston is 88.97, and the first oversize is listed as 89.22 according to the manual.

I've always wondered if the flat tops on a E12 head were the 8.1:1 CR and the "baby grands" provided the 8.3:1 CR.

Maybe the flats were used only in the 49-state '76 cars with the #5 cam?

My pistons are the original (still in spec) and the stock #2 cam is in the E12 head.

 

PistonID.thumb.JPG.aa972ca7ad50253bd05dfbe416b66b63.JPG

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1 hour ago, John76 said:

Were your original pistons flat-tops?  Or... were they changed to flat-tops to accommodate the "ostrich egg" cam?

The '76 standard piston is 88.97, and the first oversize is listed as 89.22 according to the manual.

I've always wondered if the flat tops on a E12 head were the 8.1:1 CR and the "baby grands" provided the 8.3:1 CR.

Maybe the flats were used only in the 49-state '76 cars with the #5 cam?

My pistons are the original (still in spec) and the stock #2 cam is in the E12 head.

 

PistonID.thumb.JPG.aa972ca7ad50253bd05dfbe416b66b63.JPG


John,

 

I suspect all E12 heads on U.S.-spec cars got some form of piano-top pistons and only E21 heads on U.S.-spec cars were mated to flat-top pistons.

 

There appear to be both 8.1 and 8.3 versions of the piano-top E12 pistons (below). While hardly dispositive, note that the NOS versions below marked “8.1” are also marked “USA”. The U.S. supplement of the Owner’s handbook that came with my ‘76 identified the compression ratio as 8.1:1, not providing different ratios for CA and 49-state versions. I know: none of this is authoritative! Just the ramblings of some old guy…

 

Best regards,

 

Steve

 

IMG_1408.png

IMG_0416.png

1976 2002 Polaris, 2742541 (original owner)

1973 2002tii Inka, 2762757 (not-the-original owner)

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