M20 "I" head Vs "E" head

[liv2race]

Thanks guys. So as stated above.... Even with the p&p job the ports are still not going to be as good as I ports.

anyone have the measurment of the port size of the two?

[ForcedFirebird]

sounds like a super-eta head. IIRC that was an 885 head with simgle springs, 4 CAM JOURNALS DRILLED and smaller ports.

AGAIN!!! The 885 heads ALL had 7 bearing journals!!! The seta cam had 7 journals, so why would there be 3 of them non-drilled?

[ForcedFirebird]

Thanks guys. So as stated above.... Even with the p&p job the ports are still not going to be as good as I ports.

anyone have the measurment of the port size of the two?

Here's a gasket that matches close to the 885 port laid on an eta port...

[whodwho]

AGAIN!!! The 885 heads ALL had 7 bearing journals!!! The seta cam had 7 journals, so why would there be 3 of them non-drilled?

Not ALL of them were 7 journal cams, heads yes. Most I have seen/read on have been 4 and only the later ones were suposedly 7, I have one of the 4 journal ones.

[ForcedFirebird]

Not ALL of them were 7 journal. Most I have seen/read on have been 4 and only the later ones were suposedly 7, I have one of the 4 journal ones.

American seta? Only one year was made and had 7 journals, not sure what you mean by early/late?

[whodwho]

American seta? Only one year was made and had 7 journals, not sure what you mean by early/late?

Yes, and yes only the one model year but it sounds like only the late 88s had the 7 journal ones.

[liv2race]

OK, so, for argument sake. if it is a seta head. it still has smallers ports and a 37CC chamber and not a 42CC.


basicly a large paperweight?

[whodwho]

No, a SETA head is a 885 so the same as an I head

[ForcedFirebird]

Yes, and yes only the one model year but it sounds like only the late 88s had the 7 journal ones.

Hmm.

While looking for more info on this, I came across the fact that Sept 85 was the cutoff for the two different pistons used in the eta's. One having 10.2:1 and the other having 11:1. My car was built in Sept of '85, but can't see in the pics I took weather or not it has the 27 6KA or 27 6EB block (if ti has the early 11:1 block would explain why it's so freakishly fast).

Here I was going off info from r3v about the 8.3:1 compression, but according to the e30zone wiki page, it should be much higher...

http://www.e30zone.net/e30zonewiki/index.php/Building_a_2.7

Now I am going to have to pull the car in the shop and see if I can take a look-see at the block I have lol, can't make it out in this pic...

[whodwho]

American seta? Only one year was made and had 7 journals, not sure what you mean by early/late?

Here is a pic of a 4 journal one, you can see only 4 of the journals are drilled for oil passages.

[liv2race]

No, a SETA head is a 885 so the same as an I head

Thanks man. And then once the machine shop drilled them holes for the oiling it bacame identical to a "i" head.

Correct?


Thanks again so much guys!!!!!

[whodwho]

Correct for the head if it is one of the 4 journal ones, the cam is different(obviously) and has single springs.

Edit: But you need to check the side of the head for the part number to see if it is a ETA or SETA

[liv2race]

yeah this head was fully worked and aftermarket stiffer springs, Im doing my own after market cam, and it has the P&P with the oil holes drilled in.

So, Im good to go! Thanks guys!

Im going to the garage tomorrow. Ill take a bunch of pics then and post up

[ForcedFirebird]

Here is a pic of a 4 journal one, you can see only 4 of the journals are drilled for oil passages.

Thanks!

It's so hard to find accurate info during the times that BMW made changes...

[ForcedFirebird]

Apparently all US models got the deep dish pistons :(

http://www.bmwccn.no/rogaland/Mahle_m20.html