E28 M30 motor
Posted: Sun Jun 20, 2021 5:52 pm
Other than the Motronic system is this basically the same block as the 530i or different in some respects? Could the block be used in the E12?
Firstfives.org
The E12 Registry
https://firstfives.org/phpBB-3.2.1/phpBB3/
E28 M30 motor
https://firstfives.org/phpBB-3.2.1/phpBB3/viewtopic.php?t=6195
Page 1 of 1
Re: E28 M30 motor
Posted: Sun Jun 20, 2021 9:45 pm
If this is a US 2.8 motor, it should have slightly higher compression (9.3:1) than the 3.0 (8:1).
Re: E28 M30 motor
Posted: Mon Jun 21, 2021 6:37 am
and a bit lower HP?
Re: E28 M30 motor
Posted: Mon Jun 21, 2021 11:40 am
I think it made perhaps 8 bhp more than the 530i 3.0 liter.
Re: E28 M30 motor
Posted: Thu Jun 24, 2021 1:00 am
Yes, you can use the block. From the E28, you're basically looking at either the M30B32 or M30B34 from memory, corresponding to the 533i and 535i, respectively. Things get a little weird with the E34/E32 M30B35, notably you'd need
an adapter motor mount bracket for at least one side.
One minor unexpected difference is the coolant fitting that feeds your throttle body to warm it up is not tapped and
threaded and available on the M30B34. I wanted to keep that function, see I tee'd the heater core input hose from the back of the cylinder head to substitute this same function.
The M30B34 has a little more HP, but a lot more torque than the M30B30 3.0L as I recall. Compression is a little different too.
an adapter motor mount bracket for at least one side.
One minor unexpected difference is the coolant fitting that feeds your throttle body to warm it up is not tapped and
threaded and available on the M30B34. I wanted to keep that function, see I tee'd the heater core input hose from the back of the cylinder head to substitute this same function.
The M30B34 has a little more HP, but a lot more torque than the M30B30 3.0L as I recall. Compression is a little different too.
Re: E28 M30 motor
Posted: Thu Jun 24, 2021 4:29 am
in 2007, in my 77 528i, I swapped my original motor to one out an E28 which came with a 5 speed sport gearbox - stupidly I gave that gearbox away! 
I reget doing that.
Anyway once installed this motor was a rocket - I reckon it has a non standard cam - has a lopey idle - gees with the 4 speed box its quick!
All I had to do was swap over the engine mounts, sump, power steering pump brackets, air con brackets, injection system, exhaust manifolds and think maybe the water pump. I might have also had an issue with the rear heater pipes - cant remember. I think I also changed over the clutch.
Then I put it all in the car.
BTW I did the remove from underneath installation - which was mostly okay - took quite a while to line up the 4 x cross member to chassi bolts. - hardest part was reinstalling the air con.
some photos
the engine as purchased ( form a car that had an accident)
removing engine and trans from underneath
comparing old (sans cracked head) and new engine E28 motronic
putting new combination back in
I reget doing that.Anyway once installed this motor was a rocket - I reckon it has a non standard cam - has a lopey idle - gees with the 4 speed box its quick!
All I had to do was swap over the engine mounts, sump, power steering pump brackets, air con brackets, injection system, exhaust manifolds and think maybe the water pump. I might have also had an issue with the rear heater pipes - cant remember. I think I also changed over the clutch.
Then I put it all in the car.
BTW I did the remove from underneath installation - which was mostly okay - took quite a while to line up the 4 x cross member to chassi bolts. - hardest part was reinstalling the air con.
some photos
the engine as purchased ( form a car that had an accident)
removing engine and trans from underneath
comparing old (sans cracked head) and new engine E28 motronic
putting new combination back in
Re: E28 M30 motor
Posted: Thu Jun 24, 2021 7:45 am
Thanks for the info. 