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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 01-27-2008, 07:07 PM   #1 (permalink)
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e30 gurus...i call on u

I pulled the head on my 88 325is, and i have a variance of 0.005 on two cylinders. I sent a couple PM's to those i know, but does anyone have the acceptable variance specifications on the m20?


Dave
Edit: I will uber rep anyone who gets me that right info.
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Old 01-28-2008, 02:04 PM   #2 (permalink)
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I'll look in my bentley as soon as I get home.
Provided my car gets home... (thermo is stuck so she overheated today....)
Not cool.
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Old 01-29-2008, 12:50 PM   #3 (permalink)
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Adam, definitely not cool.

Although, if the head IS out of specs, then i have a viable reaosn to spend dorra on M50...
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Old 01-30-2008, 10:35 AM   #4 (permalink)
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sorry, I know it's a horrible excuse but my car decided that it didn't like to cool itself any more, so I was kinda busy with that.
Hopefully it's just a bad thermostat and no engine damage occured.
To answer your question...
All it says in the book is that "A warped cylinder head can be machined provided no more than .3 mm (.012 in) of material is removed. If further machining is required, the head should be replaced."
It has a picture of a head with a straightedge and a feeler gauge that is labeled "Straight edge and feeler gauge being used to check straightness of cylinder head gasket surface"
I don't see any variance for how straight or tight the straightedge needs to be across the top of the head.
There is a chart that has the max and min measurements for the height of the head (before/after machining)
Sorry I couldn't be more help.
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Old 01-30-2008, 11:23 AM   #5 (permalink)
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Nope that helps. take that much off and you still have a variance of 0.002. that's 0.002 more than i want to have.

m50/s50/2 swap anyone?
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Old 01-31-2008, 10:34 AM   #6 (permalink)
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swap it
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Old 01-31-2008, 10:39 AM   #7 (permalink)
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M30?
There's no replacement for displacement? Cheap powa?
Got my M30 that had had a lot of the once in an engine lifetime stuff (cam, headwork, etc) stuff done to it, 128K... $500
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Old 01-31-2008, 10:50 AM   #8 (permalink)
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ehh i have to completely disagree... Twin Cam > M30

No replacement for technology

if you are going FI on a budget...then the M30 is decent...it needs boost to really come alive...

either way its going to be more power than the M20
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Old 01-31-2008, 01:10 PM   #9 (permalink)
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CHEAP/FAST/RELIABLE

Pick two.

So I get Cheap and Reliable. Maybe not AS fast, but mildly quick.

loads better than the m20. Yes.
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Old 01-31-2008, 02:15 PM   #10 (permalink)
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actually, when i figured the end results, it is prolly gonna run me nearly 1k for an m50 complete swap.

m20 head i located shipped is $325.

Now it is decision time, no expendable income right now so i think the m20 comes back to life.
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