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Old 01-27-2016, 09:22 AM   #16
Peterbuilt84
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Thought I'd throw up an update on this. Pulled the head off a couple days ago. Took it to the machine shop and had it checked. Head is warped pretty bad. Also found that the whole motor is full of stop leak. The coolant passages in the head are pretty much full.

Plan now is to take a look at the m10 I picked up for free and see what can be used.
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Old 01-27-2016, 12:17 PM   #17
TobyB
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Thanks for the update. And yes, if the head's been really warped, then the pistons
may not be healthy-
M10's aren't hard to find. If the freebie isn't good, keep looking. Don't spend a lot.

Good luck,
t
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Old 01-27-2016, 10:17 PM   #18
Peterbuilt84
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Quote:
Originally Posted by TobyB View Post
Thanks for the update. And yes, if the head's been really warped, then the pistons
may not be healthy-
M10's aren't hard to find. If the freebie isn't good, keep looking. Don't spend a lot.

Good luck,
t
Thanks! My goal is to keep this on the cheap. Even though a motor swap is super tempting right now.

Also discovered that a rust hole about 8 inches long formed on the firewall right behind the battery. It's been letting water seep in and the carpet is soaked. Looks like another few things to add to the list of to dos lol.
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Old 01-28-2016, 01:24 PM   #19
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Took a look at the e21 donor motor. It has holes in the head for the injectors. Would it work if I just plugged these? Maybe tap them and screw in a pipe plug? Not sure if there is a better way to go about it. Input appreciated!!
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Old 01-28-2016, 03:26 PM   #20
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If it's the 1.8i (I think it is) then yep, just plug them some way. Reasonably securely!

t
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Old 01-28-2016, 03:33 PM   #21
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m10 cars are fun as hell and the gearing is not stupid short like the m42, which I think is nice. Keep it original!
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Old 01-29-2016, 09:29 AM   #22
packratbimmer
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M10 rules

https://www.youtube.com/watch?v=t5Db...ature=youtu.be

and the M10 318i is super light!
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Old 01-30-2016, 07:16 AM   #23
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I am finding it darn near immpossible to find M10 parts in Southern ontario. And I am running out of cranks and other parts.
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Old 02-02-2016, 04:44 PM   #24
Peterbuilt84
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Another update. Confirmed the "new" motor is a 1.8. Pulled the e21 m10 head off and took it to the machine shop. He said it's in good shape and can be used. Cylinder walls and water jackets look good. Probably going to try to tap the hole and run pipe plugs. Also looked into it and saw some people use a ball bearing and JB weld. Seemed kind of ghetto to me. Definitely easier though.

Plan now is to swap the e21 motor into the e30. Anyone have a good link? TobyB it seems like you are knowledgeable on this topic.

Maybe I should start a build thread...
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Old 02-03-2016, 08:21 AM   #25
packratbimmer
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See if you can find freeze plugs that small. Just pop them in if you can
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Old 02-03-2016, 05:26 PM   #26
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I've never stuffed one into an E30, only a 2002.

I like the freeze plug idea, if you can find one that fits.
Tapping is difficult, and it runs the (small) risk of cracking the head.
If you tap it, find a size that's easy to tap, then JB weld (or other epoxy)
it in there.

If it's an E21 head, it's a 2L engine, and that will be a nice torque bump.
And the EFI can deal with it, we've proven on the 2002's.

I would put the E30 oil pan on, and you can put together an E30
oil pump out of the best parts.

hth

t
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Old 02-09-2016, 12:48 PM   #27
Peterbuilt84
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Quote:
Originally Posted by packratbimmer View Post
See if you can find freeze plugs that small. Just pop them in if you can
Freeze plugs never crossed my mind. Something to look into. Thanks for the idea!

Quote:
Originally Posted by TobyB View Post
I've never stuffed one into an E30, only a 2002.

I like the freeze plug idea, if you can find one that fits.
Tapping is difficult, and it runs the (small) risk of cracking the head.
If you tap it, find a size that's easy to tap, then JB weld (or other epoxy)
it in there.

If it's an E21 head, it's a 2L engine, and that will be a nice torque bump.
And the EFI can deal with it, we've proven on the 2002's.

I would put the E30 oil pan on, and you can put together an E30
oil pump out of the best parts.

hth

t
Forgive me for my ignorance, but is 2L an engine code? I noticed the pistons look different in the 2 motors.

Are there any other parts that need to be swapped besides the oil pan? I am planning on tearing apart both motors next to each other and hopefully I will notice any differences.

Are the oil pumps different? Something to research.

Thanks for the help!
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Old 02-09-2016, 01:29 PM   #28
packratbimmer
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2L refers to 2 liters. Oh, and an E21 car can also have an E21 head casting (a bit confusing). Yes, the piston dome should match the combustion chamber. The M10 had a number of piston styles over the years/generations.

I would suspect that your E21 1.8 engine has a 1.8 casting if there are injector ports in the head?

Last edited by packratbimmer; 02-09-2016 at 01:33 PM. Reason: clear
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Old 02-09-2016, 01:47 PM   #29
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Yeah, sorry, longer stroke crank makes it 2 liters.

If the pistons look different, then yes, one is a 2 liter engine- all the 1.8i pistons look the same.

I THINK the 1.8i pistons work with the head that says E21 on the side- the dome fits,
and nothing's too shrouded. But you don't want to use the flattop E21 pistons with the
1.8i head- you'll get a compression ratio that's more suited to a tractor!

Can you post pix?

t
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Old 02-09-2016, 04:35 PM   #30
Peterbuilt84
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Quote:
Originally Posted by packratbimmer View Post
2L refers to 2 liters. Oh, and an E21 car can also have an E21 head casting (a bit confusing). Yes, the piston dome should match the combustion chamber. The M10 had a number of piston styles over the years/generations.

I would suspect that your E21 1.8 engine has a 1.8 casting if there are injector ports in the head?
That's what I thought, that 2L meant 2.0 liter. The e21 head does have a 1.8 casting on the side.

Quote:
Originally Posted by TobyB View Post
Yeah, sorry, longer stroke crank makes it 2 liters.

If the pistons look different, then yes, one is a 2 liter engine- all the 1.8i pistons look the same.

I THINK the 1.8i pistons work with the head that says E21 on the side- the dome fits,
and nothing's too shrouded. But you don't want to use the flattop E21 pistons with the
1.8i head- you'll get a compression ratio that's more suited to a tractor!

Can you post pix?

t
My plan is to use the entire e21 motor with the e30 injection grafted on. So it should all work together like stock.

I will try to snap some pics tonight of everything.
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