M70 starter on an M30

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shocka
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M70 starter on an M30

Post by shocka »

My friend has an e34 535i and he heard you can use a m70 starter. He's got one on the way, im looking forward to seeing if it works.

Just putting this out there, more to come. No performance gains obviously, but they do sound amazing.
Shawn D.
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Post by Shawn D. »

It's not really worth posting about it until it's confirmed to fit and function properly.
Mike W.
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Post by Mike W. »

In case you're thinking it must be more heavy duty, maybe not. Remember you are only cranking over one cylinder at a time (ok, somewhat more especially with a 12) and 3.5 cylinders are larger than 5/12. As an illustration of that, early M30s used the same starter as 4 cylinder M10s, a 1.0HP one. Later M30s used 1.2 and later M10s 1.1, so still not much difference between the 4 and 6 engines. And for trivia sake, yes, they are interchangable. :D (M10 and M30 that is, I have no idea about M70s)
Shawn D.
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Post by Shawn D. »

Mike W. wrote:In case you're thinking it must be more heavy duty, maybe not. Remember you are only cranking over one cylinder at a time...
... but the duty cycle is worse.
shocka
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Post by shocka »

No, i think its just interesting. Not as a "performance mod" at all haha. Im not surprised the m10 and 30 share a starter, dont the flywheels interchange too?
e38740imd
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Re: M70 starter on an M30

Post by e38740imd »

Bump.

I've read a few articles about this. But not as much info as I expected

And I'm looking to do the samething

Any reports about a damaged flywheel in the process? If not I gonna do this upgrade. Looks just to be a bolt and go affair
e38740imd
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Re: M70 starter on an M30

Post by e38740imd »

Re Bump.

For anyone else trying to do this.

It works. Just Bolt and go. The m70 starter has two terminals on the body of the starter. I used one as an additional ground to the starter. Do you need too? Prolly not. But it doesn't hurt
Mike W.
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Re: M70 starter on an M30

Post by Mike W. »

Interesting. How big is it? Does it have a PS (HP) rating on it like some do? Advantages/disadvantages, other than if you tried to use it as a core. :D
e38740imd
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Re: M70 starter on an M30

Post by e38740imd »

It is definetly bigger. It's just a more powerful starter. You should have faster start ups theoretically

This is the only pick I have of it on the block. Engine already installed in the car.

The power rating was on the literature in the box. I got an autozone version. Lifetime warranty with unlimited replacements. And it's only 155 plus tax

http://imgur.com/a/fFtqIXO

http://imgur.com/a/3Dcdkx3
Shawn D.
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Re: M70 starter on an M30

Post by Shawn D. »

e38740imd wrote: Oct 17, 2021 1:36 AM It is definetly bigger.
Sounds like a negative. The benefit of an M30B35 starter is that it's smaller than a B34 starter and is easier to r & r.
e38740imd
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Re: M70 starter on an M30

Post by e38740imd »

Only Negative of using the m30 Starter is that because of its size, the intake manifold will need to be removed as you can no longer hit the top bolt straight on. The angle is too sharp to just use extensions. So it's kinda sad 😔
CanadianMiniFan
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Re: M70 starter on an M30

Post by CanadianMiniFan »

Just a thought, somebody mentioned the m70 starter “sounds cool”, the reason v12s sound cool, as in spaceship smooth, when cranking is because there is more than one piston on compression stroke at a time, so the transition between cylinders is seamless, unlike a lesser cylindered engine. I imagine the m70 and m30 starters both sound like electric motors in isolation.
e38740imd
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Re: M70 starter on an M30

Post by e38740imd »

I can confirm

M30 with the v 12 starter sounds the same.


The v12 itself sounds cool starting up
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