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Re: To rebuild or not to rebuild. (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by WH on October 13, 2000 at 20:29:35:

In Reply to: To rebuild or not to rebuild. posted by Matt on October 13, 2000 at 19:33:43:


Dear forum members I need your help, I have a 1980 635 w/ a blow engine. The B.M.W. specialty shop that is doing the repairs told me that, cranshaft and rods were damaged. They are going to take the crank-shaft/rods to a machine-shop to get them " miked",to see if they can be re-worked. If they cannot reworked they informed me that it would not be worth rebuilding. They also told me that that my cylinder walls in resonably good shape and could probaly getaway without getting my block bored.

They told me that I should consider putting a block out of a 87-88 735 or a 90 735(is supposed to have high compression).


My questions are: Should I consider putting an american block in an euro car? Is it worth spending my kids college money on a complete engine rebuild?

Will I notice the loss of power? Is the specialty shop trying to encourage me to which blocks, so they can get my euro block (arent they rare)?


What is a resonable price for a complete rebuild? What is to much to spend on a 80 euro? Where can i locate euro engine parts?


If anyone has had any experience rebuilding a 6 series engine I would greatly apprecaite your input.

THANKS IN ADVANCE


Buy a used motor..... for $500-$1K you can find a really nice one.

You didn't say where you live but in most big cities there are usally some local German car wrecking yards that probably have what you need..... Or buy from the Roundel --there are usally several for sale ads in the "parts for sale" area. I have had very good luck buying from other BMW CCA owners. As for the companies offering cheapo rebuilds?? You probably get what you pay for.

Buy either a 79-81' 3.5 euro motor or a later E34 one. With the later E34 you will need to switch oil pans/oil filter head/oil pump too I believe. But you will also get the larger valves and higher compression as well....

If you are seriously thinking of spending over $3K and building one yourself just do the M5/M6 motor upgrade. It will be about the same $$ spent....

WH

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