Have an 87 325is and a year ago lost compression on a couple of cylinders. After a tear down saw that the bores were grooved due to ring failure and a few months ago purchased the motor out of a 86 325 eta that had good compression.
Tore down the 86 block and cleaned everything up. All looks very good from the cylinder bores to the bearing areas on the block and crank. I tried looking up the numbers stamped into the bearings for replacements however I cannot find any that match. Could someone please help me find a good source for all bearings as well as how I can identify the ones I need?
The head from my 87 325is is in good condition and I will be using it, however I read that the i cylinders on models that have metal bumpers (my version) require that the i cylinder skirts be machined otherwise they will not work with the e crank. Is this true as I only read this on one of the many posts?
As I understand the i cylinders were designed to work with the shape of the i head… however from what I read, I can use the e cylinders with the i head which will end up with lower compression. Considering that this will again be a turbo application… would using the e cylinders be a bad decision?
And finally… could someone assist in a good source for the cylinder rings as well as how I can identify the ones I need?
I apologize in advance for the NEWB questions. Although I did all of the work to get my E30 going Turbo with MS this is my first engine rebuild. I know that this effort could cost a ton of money depending upon the work done… but I don’t have a big budget and really want to get new bearings and rings on her, and get up and going again. Stock i engine with 100K already on the clock lasted 5 years as a daily driver post turbo… if I get another 5 out of a “freshened” engine I will be a happy camper.
Thanks in advance.
Tore down the 86 block and cleaned everything up. All looks very good from the cylinder bores to the bearing areas on the block and crank. I tried looking up the numbers stamped into the bearings for replacements however I cannot find any that match. Could someone please help me find a good source for all bearings as well as how I can identify the ones I need?
The head from my 87 325is is in good condition and I will be using it, however I read that the i cylinders on models that have metal bumpers (my version) require that the i cylinder skirts be machined otherwise they will not work with the e crank. Is this true as I only read this on one of the many posts?
As I understand the i cylinders were designed to work with the shape of the i head… however from what I read, I can use the e cylinders with the i head which will end up with lower compression. Considering that this will again be a turbo application… would using the e cylinders be a bad decision?
And finally… could someone assist in a good source for the cylinder rings as well as how I can identify the ones I need?
I apologize in advance for the NEWB questions. Although I did all of the work to get my E30 going Turbo with MS this is my first engine rebuild. I know that this effort could cost a ton of money depending upon the work done… but I don’t have a big budget and really want to get new bearings and rings on her, and get up and going again. Stock i engine with 100K already on the clock lasted 5 years as a daily driver post turbo… if I get another 5 out of a “freshened” engine I will be a happy camper.
Thanks in advance.
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