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alain-montreal · 01-24-2009, 06:27 PM

hi
my mane is alain
just bought a 1972 2800 3.0s with an non runing motor....the motor broke on the highway with a big klong noise in the motor the last owner said....but with the car come a 735i 1990 motor working with 180 on each piston
i use to work on volkswagen...so i konw my mechanics
but how hard is it to swap the motor and can i swap the card head with the injected one ...i would like to keep the car as original has possible
thanks
my english is not so good sorry

nuts4bmw · 01-24-2009, 07:53 PM

Hello Alain,

I envy you with your new car, and welcome to the site.

If I were you, I would disassemble the original motor to see if it can be rebuilt. It will cost some money but in the end the overall job could be easier. You won't have to change motor mounts, worry about the wiring or fitting the transmission to a new block.

Of course this is all just my opinion, especially because you want to keep the car as original as possible.

alain-montreal · 01-24-2009, 08:08 PM

ya sure
i was planning to open the broken motor and see if it was fixable
but form the forum i wwant to know what have to be change ...some people said that the motor would fit right away and i can put the carrb head on the 735 motor and don t use the injected system?? is that true

M635 · 01-24-2009, 09:38 PM

Originally Posted by alain-montreal

some people said that the motor would fit right away and i can put the carrb head on the 735 motor and don t use the injected system?? is that true

The 735i motor is a 3.5l M30 B35 engine. It should fit into your classic, but obviously there will be modifications to make it fit. But honestly, I've never heard that you can make an injected engine into a carb? Could that really happen?

nuts4bmw · 01-24-2009, 09:45 PM

If you swapped the heads you could which is what Alain want to do I believe. Which raises the question: are the heads interchangeable from these two motors?

alain-montreal · 01-25-2009, 07:58 AM

exactly ,
are they interchangeable ?
look like i recicieve wrong information
i learned that the 735i was in a bavaria 1974 and has a 4 speed gearbox with it

Poon · 01-25-2009, 08:52 PM

I believe both of them use M30's.

They engine should literally bolt right in. The bavaria's and 2800's, and 3.0 csl's all used M30's. I would suggest keeping the 735i's fuel injection system, simply for ease of use, but to keep it old school you can twin carburate it.

http://cgi.ebay.com/ebaymotors/Cars-...1%7C240%3A1318

There is a 2800 here that has the same modification done. The trannies, should also bolt up.

-Andrew Poon

alain-montreal · 01-30-2009, 03:25 PM

anybody have parts for the 2800/2500/3.0s????

82eye · 01-31-2009, 05:56 PM

There is a Bavaria here at one of the wreckers with the Solex big dual carb set up. I don't know if you need the head, but the intake, carbs, fuel pump, and fuel pump relay should all be available. I'll have a look in the next couple days to see if it is still available.

These guys might be able to help too: http://i-vol.com/bmwbavaria/index4.htm

01-24-2009, 06:27 PM	#1 (permalink)
alain-montreal newbie Name: alain Joined: Jan 2009 From: montreal Posts: 25 iTrader: 0 Thanks: 3 0 Times in 0 Posts '92 BMW 525iT '72 BMW 2800 3.0s	just bought 1972 2800 3.0s with broken motor! How hard to swap motor? hi my mane is alain just bought a 1972 2800 3.0s with an non runing motor....the motor broke on the highway with a big klong noise in the motor the last owner said....but with the car come a 735i 1990 motor working with 180 on each piston i use to work on volkswagen...so i konw my mechanics but how hard is it to swap the motor and can i swap the card head with the injected one ...i would like to keep the car as original has possible thanks my english is not so good sorry

01-25-2009, 08:52 PM	#7 (permalink)
Poon Senior Member Name: Andrew Joined: Mar 2007 From: Surrey Posts: 387 iTrader: 1 Thanks: 1 6 Times in 6 Posts Poon's pictures '72 BMW 2002 '80 BMW 320is '76 BMW 2002	I believe both of them use M30's. They engine should literally bolt right in. The bavaria's and 2800's, and 3.0 csl's all used M30's. I would suggest keeping the 735i's fuel injection system, simply for ease of use, but to keep it old school you can twin carburate it. http://cgi.ebay.com/ebaymotors/Cars-...1%7C240%3A1318 There is a 2800 here that has the same modification done. The trannies, should also bolt up. -Andrew Poon __________________ www.germanautosports.com '72 2002 Chamonix (Rust Bucket) '76 2002 Mintgrun (Summer DD) '80 320is Imola (Year 'round DD)

01-31-2009, 05:56 PM	#9 (permalink)
82eye Member Name: Dale Joined: Sep 2008 From: Saskatchewan Posts: 51 iTrader: 0 Thanks: 1 2 Times in 2 Posts	There is a Bavaria here at one of the wreckers with the Solex big dual carb set up. I don't know if you need the head, but the intake, carbs, fuel pump, and fuel pump relay should all be available. I'll have a look in the next couple days to see if it is still available. These guys might be able to help too: http://i-vol.com/bmwbavaria/index4.htm __________________

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01-24-2009, 07:53 PM	#2 (permalink)
nuts4bmw Senior Member Name: Art Joined: Oct 2008 From: Surrey Posts: 234 iTrader: 0 Thanks: 5 5 Times in 4 Posts nuts4bmw's pictures '95 BMW M540i	Hello Alain, I envy you with your new car, and welcome to the site. If I were you, I would disassemble the original motor to see if it can be rebuilt. It will cost some money but in the end the overall job could be easier. You won't have to change motor mounts, worry about the wiring or fitting the transmission to a new block. Of course this is all just my opinion, especially because you want to keep the car as original as possible.

01-24-2009, 08:08 PM	#3 (permalink)
alain-montreal newbie Name: alain Joined: Jan 2009 From: montreal Posts: 25 iTrader: 0 Thanks: 3 0 Times in 0 Posts '92 BMW 525iT '72 BMW 2800 3.0s	ya sure i was planning to open the broken motor and see if it was fixable but form the forum i wwant to know what have to be change ...some people said that the motor would fit right away and i can put the carrb head on the 735 motor and don t use the injected system?? is that true

01-24-2009, 09:45 PM	#5 (permalink)
nuts4bmw Senior Member Name: Art Joined: Oct 2008 From: Surrey Posts: 234 iTrader: 0 Thanks: 5 5 Times in 4 Posts nuts4bmw's pictures '95 BMW M540i	If you swapped the heads you could which is what Alain want to do I believe. Which raises the question: are the heads interchangeable from these two motors?

01-25-2009, 07:58 AM	#6 (permalink)
alain-montreal newbie Name: alain Joined: Jan 2009 From: montreal Posts: 25 iTrader: 0 Thanks: 3 0 Times in 0 Posts '92 BMW 525iT '72 BMW 2800 3.0s	exactly , are they interchangeable ? look like i recicieve wrong information i learned that the 735i was in a bavaria 1974 and has a 4 speed gearbox with it

01-30-2009, 03:25 PM	#8 (permalink)
alain-montreal newbie Name: alain Joined: Jan 2009 From: montreal Posts: 25 iTrader: 0 Thanks: 3 0 Times in 0 Posts '92 BMW 525iT '72 BMW 2800 3.0s	anybody have parts for the 2800/2500/3.0s????

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just bought 1972 2800 3.0s with broken motor! How hard to swap motor?