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Old 05-12-2009, 11:43 AM   #1
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Question timing adjustment after engine rebuild? 99-00

Hi,

how would you go about the timing adjustment after the engine rebuild.

The NB crank and cam sensors are static (not adjustable as the 90-97 CAS) to 10 BTDC at idle.
When my engine rebuild is done I will have to check this, right?!

Should I switch in my OEM injectors, connect my OEM ECU (which I indeed can, cause I am running my MS2 parallel with a boomslang harness) and then switch back to the 460cc injectors and go set the timing for the MS?

How did you or would you do this? (I.e. am I correct with my suggestions?!)

Greets
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Old 05-12-2009, 12:59 PM   #2
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Were you running the MS prior to rebuilding the engine?

If so, do nothing. Simply re-install, start it up, and you should be within a degree or two of correct. Nothing done during the engine rebuilding process will change the positional relationship of the crank and cam indicators relative to their sensors.

If you want to be ultra-conservative, you can do what I do for every first-time start up. Unplug the injectors, and have somebody crank the engine while you observe the timing mark with a light. So long as it's within +/- 10 degrees or so of 10, it'll be fine to connect the fuel and start it up for the
proper timing adjustment.
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Old 05-12-2009, 01:39 PM   #3
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That would be easy then...

I thought the rebuild would maybe change the trigger angle I need at the MS.
(P.S.: Yes I had the engine running with the MS2 before.)

I will be ultra-conservative and check with the injectors unplugged

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Old 05-12-2009, 02:02 PM   #4
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There should be no change. The timing wheel can fit onto the crankshaft only one way (unless you flip it over backwards) and the position of the indicator on the camshaft gear cannot be changed unless you have the cams themselves set incorrectly.
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Old 05-12-2009, 02:39 PM   #5
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But why is the trigger angle different for every car then.... ?

What depends the trigger angle from? Depending from how the CKP/CMP-circuit is made? Other influences?

Just for me to know.

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Old 05-12-2009, 09:16 PM   #6
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Quote:
Originally Posted by Zaphod View Post
But why is the trigger angle different for every car then.... ?
Is it? Honestly, I haven't done many NBs, but I wouldn't expect there to be much variance between them.
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Old 05-13-2009, 03:15 AM   #7
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When I started last year, Abe send me his MSQ and his trigger angle was at 4.00 degrees. Mine is at -6.00 degrees. (Up to -20 degrees is possible with MS2 - I asked that at msextra.com) -

What bugs me now, as I see this - That would give me an absolut 10 degrees between those two values...

O.K. The NB 99-00 has got two marks at the pulley, a (supposedly) white and a yellow. My German handbook is somewhat indifferent about the use of those two. Now I just had another look at the English handbook - that makes it all clear. The right (white) mark has to line up with the T mark at the timing belt cover and the left yellow mark has to be at the 10 mark at the timing belt cover... Maybe I should have known this before.

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