e36 vs e30 m42 valve springs
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kizzu

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e36 vs e30 m42 valve springs
« on: June 10, 2016, 01:21:35 PM »
Hi guys,
I'm new to the forum so please bear with me. So I bought a 92 m42 off an e36 and would like to fit it in my e30. I would like to flow the head to achieve a higher compression and maybe even port it. I would also like to raise the limiter to 7.5k once tuning the engine. So my questions are:
1) should I opt for a safer 7k or is the engine capable of 7.5k with stock internals?
2) being an e36 engine should I swap to the e30 double valve spring setup or the e36 ones will be suitable as well?
3) should I get an e36 loom and ecu or the e30 one?
4) What other mods should I go after to increase horsepower whilst keeping stock internals?
Ps: the engine will be running stock internals with an e30 intake and exhaust manifold and ARP headstuds.

ANY input is highly appreciated :)

Thanks!
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Darky

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Re: e36 vs e30 m42 valve springs
« Reply #1 on: June 10, 2016, 09:18:49 PM »
You can't use the e30 valve springs with e36 valves.
6mm e36
7 mm e30

Unless you get new retainers collets and that top bit can't remember it's name at the moment.
All have to work together.

As far as loom goes match to inlet manifold or your tuning.
But m44 maf is technically the best but then your tuning. Not many can tune the m44.
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Mimikrakra

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Re: e36 vs e30 m42 valve springs
« Reply #2 on: June 11, 2016, 07:45:51 AM »
Hi, my M42 takes 7.5K since 6 years without problem. Even with a reprog the Pmax is still at 6.4K.
You will have to change the oil carter to put it in your E30.
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http://www.m42club.com/forum/index.php?topic=18485.0

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kizzu

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Re: e36 vs e30 m42 valve springs
« Reply #3 on: June 11, 2016, 02:37:18 PM »
Quote from: Mimikrakra on June 11, 2016, 07:45:51 AM
Hi, my M42 takes 7.5K since 6 years without problem. Even with a reprog the Pmax is still at 6.4K.
You will have to change the oil carter to put it in your E30.

Are you running everything stock? And what m42 variant? e30 or e36?
So increasing the limiter to 7.5 and tuning it accordingly won't increase high end hp?
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kizzu

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Re: e36 vs e30 m42 valve springs
« Reply #4 on: June 11, 2016, 02:39:18 PM »
Quote from: Darky on June 10, 2016, 09:18:49 PM
You can't use the e30 valve springs with e36 valves.
6mm e36
7 mm e30

Unless you get new retainers collets and that top bit can't remember it's name at the moment.
All have to work together.

As far as loom goes match to inlet manifold or your tuning.
But m44 maf is technically the best but then your tuning. Not many can tune the m44.
There are 6mm retainers from vac to adapt to double springs from the 7mm ones.. Didn't get the m44 bit though..
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Darky

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Re: e36 vs e30 m42 valve springs
« Reply #5 on: June 11, 2016, 05:29:50 PM »
Ok then didn't know vac did that.
It would be the way to go then.
E30 m42 valve springs are rated as the best oem springs bmw ever made, don't know why they went cheap on the e36.

Simply put the the best Dem ecu is the e36 m44 it's the only one with maf, rather than that flapper door thing.
But it is a cow to tune, very few do it.

E36 m42 and e30 m42 you have to match to the inlet manfold your using otherwise you are tuning it.
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