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E30 M3 Throttle Housing Assembly Throttle screws |
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M3Tarmac 
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Joined: 27 Sep 2021 Location: Hampshire Status: Offline Points: 10 |
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 Topic: E30 M3 Throttle Housing Assembly Throttle screwsPosted: 23 Oct 2021 at 4:51pm |
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Anyone able to shed light on the Throttle Screws on each throttle body / intake on the E30 M3 S14 engine? Part # 13541402567, arrowed in pic below.
They seem redundant but are maybe used when tuning the engine? My car is nearing return to the road and I want to set the engine up as best as possible.  |
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Robert
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Joined: 15 Aug 2006 Location: United Kingdom Status: Offline Points: 137 |
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Posted: 23 Oct 2021 at 5:38pm |
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They are used to balance each of the throttle bodies. Very important for smooth running engine. You will need something like the following: Morgan Carbtune - carburetor synchronizer for balancing motorcyclecarbsBut before you do this you must first ensure there are no air leaks anywhere and have checked all valve shimm gaps are within tolerance. The thick plastic/rubber type gaskets that go between the head and the manifold probably need replacing at least as they give up with age. Edited by Robert - 23 Oct 2021 at 5:43pm |
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M3Tarmac
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Joined: 27 Sep 2021 Location: Hampshire Status: Offline Points: 10 |
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Posted: 23 Oct 2021 at 5:42pm |
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Outstanding, thanks Robert.
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Robert
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Posted: 23 Oct 2021 at 5:44pm |
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Sorry, see my re-editted post.
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Mike Fishwick
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Joined: 04 Aug 2006 Location: France Status: Offline Points: 2753 |
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Posted: 23 Oct 2021 at 10:21pm |
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They are not redundant! These are the throttle by-pass screws,
which adjust the volume of air passing through a small orifice
by-passing the throttles. They therefore provide a fine adjustment to
the air intake of each throttle body, and are effective when the
throttles are closed. This permits the vacuum level on each throttle body to be equalised to give a smooth idle at the speed required. The
yellow plastic caps are simply covers concealing the adjusters, which
can be locked in position with a dab of silicone between the cap and the
surrounding aluminium. |
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M3Tarmac
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Joined: 27 Sep 2021 Location: Hampshire Status: Offline Points: 10 |
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Posted: 26 Oct 2021 at 2:47pm |
 Hi again guys,At the other side of the engine, what are these bolts, one on top of each of the primaries on the exhaust manifold for? Photo attached...
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M3Tarmac
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Joined: 27 Sep 2021 Location: Hampshire Status: Offline Points: 10 |
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Posted: 28 Oct 2021 at 9:36am |
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I understand they are for seeing co2 on each cylinder - any further intel on that please?
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