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Timing Specs 77/78 M90 635CSi EURO

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Klaus
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Timing Specs 77/78 M90 635CSi EURO

Post by Klaus » Fri Oct 12, 2018 7:22 pm

Can anybody please check what the factory timing is supposed to be for an 77 or 78 m90 EURO 635? I currently have it set with the 22 deg mark at 2200 rpm with both vacuum hoses disconnected and plugged. Engine has notable ping under heavy acceleration from about 3-5k rpm.

Thanks in advance,
Klaus

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Hefeweizen
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Re: Timing Specs 77/78 M90 635CSi EURO

Post by Hefeweizen » Sat Oct 13, 2018 7:57 pm

Klaus,
that is what I read also for my M90. Problem is that I do not see a timing mark at all at that RPM. I do see something at 1100 rpm that I think may be the timing mark. I do have still issues with my Throttle adjustment and get to my timing adventure again once I have that solved
Rainer
85 635CSi (Silver, Daily Driver)
79 633CSi (Red Euro, Project)

"If you think a good European mechanic is expensive, try a bad one!"

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Hefeweizen
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Re: Timing Specs 77/78 M90 635CSi EURO

Post by Hefeweizen » Sat Oct 13, 2018 10:58 pm

You can also visit http://www.firstfives.org/ .

The have a wealth of knowledge there. There is also a tech article under "Technical FAQ" on ignition timing. =D>
Rainer
85 635CSi (Silver, Daily Driver)
79 633CSi (Red Euro, Project)

"If you think a good European mechanic is expensive, try a bad one!"

m6dave
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Re: Timing Specs 77/78 M90 635CSi EURO

Post by m6dave » Mon Oct 15, 2018 7:53 am

Klaus wrote:
Fri Oct 12, 2018 7:22 pm
Can anybody please check what the factory timing is supposed to be for an 77 or 78 m90 EURO 635? I currently have it set with the 22 deg mark at 2200 rpm with both vacuum hoses disconnected and plugged. Engine has notable ping under heavy acceleration from about 3-5k rpm.

Thanks in advance,
Klaus
Question about timing - thanks in “advance” :mrgreen: :mrgreen:

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Klaus
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Posts: 194
Joined: Mon Dec 18, 2006 4:03 am
Location: Las Vegas, NV

Re: Timing Specs 77/78 M90 635CSi EURO

Post by Klaus » Sun Oct 21, 2018 4:47 pm

:D ... no pun intended!

But on a serious note... can somebody please post a picture of an emission label showing the timing specs of an early M90 L-Jet. I know that the reference mark is at 22 degrees, I really would like to know what the target rpm is. The only reference is found so far shows 1700 rpm with both vacuum lines disconnected and capped.

Thanks!

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