M20 engine DOHC or SOHC? - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 01-25-2004, 01:49 AM
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lilboi is an unknown quantity at this point
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Is the e30 with the m20 engine a dohc or a sohc? I had to replace the valve gasket today and i noticed it had two cams. Am i wrong? Here's a picture to brighten things up.
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#2 (permalink) Old 01-25-2004, 11:27 AM
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single cam shaft and dual rocker arm shafts.

It takes a little viewing to see it.

The rocker arms shafts are one for exhaust and one for intake.

The Cam shaft is in the middle.

All M20 use the same valve cover gasket.

Later,
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#3 (permalink) Old 01-25-2004, 12:00 PM
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May as well adjust the valves.
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#4 (permalink) Old 01-26-2004, 02:37 AM
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lilboi is an unknown quantity at this point
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is that hard? what tools do i need

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#5 (permalink) Old 01-26-2004, 03:36 PM
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lol if you have to ask, dont try.

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#6 (permalink) Old 01-26-2004, 09:39 PM
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lilboi is an unknown quantity at this point
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Of course i won't do it myself. I plan to do it with my friend. If its to hard, i will hold off on it. If its moderatly easy then i'll get the tools i need.

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#7 (permalink) Old 01-29-2004, 04:34 PM
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I wouldn't do it yourself if you aren't comfortable under the hood of your car. It is a VERY precise andjustment. It needs to be between 10 and 12 thou (or 10-12 thousandths or an inch). You also need to make sure that you secure the adjustment back properly. If you go less than that, you will break your rockers. If you go looser, they will have the well known m20 "ticking" sound.

The pic below is when I broke a rocker arm on my old m20 engine. Not a fun job to replace rockers!
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For Sale
1987 325is body
1995 325 motor
Performance upgrades: Genie headers, BMP cams, full custom exhaust (dual 2 1/4&quot;, mandrel bent, stainless), K&amp;N filter
Other upgrades: Sony deck, Sony 10-disc changer, sony 6x9's, high end alarm (keyless entry, motion sensors, logic sensor, etc.)
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#8 (permalink) Old 01-29-2004, 04:35 PM
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broken piece
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For Sale
1987 325is body
1995 325 motor
Performance upgrades: Genie headers, BMP cams, full custom exhaust (dual 2 1/4&quot;, mandrel bent, stainless), K&amp;N filter
Other upgrades: Sony deck, Sony 10-disc changer, sony 6x9's, high end alarm (keyless entry, motion sensors, logic sensor, etc.)
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#9 (permalink) Old 01-29-2004, 05:08 PM
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I hope this labeling helps a bit too.
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For Sale
1987 325is body
1995 325 motor
Performance upgrades: Genie headers, BMP cams, full custom exhaust (dual 2 1/4&quot;, mandrel bent, stainless), K&amp;N filter
Other upgrades: Sony deck, Sony 10-disc changer, sony 6x9's, high end alarm (keyless entry, motion sensors, logic sensor, etc.)
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