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#667106 - 04/02/09 08:52 AM Engine Timing  
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spktay1 Offline
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Everett, WA
So i just got my ss and its got a motor swap in it or at least i think that it does but any way i ran the code by the bell housing and it says that i have a 77-79 gm 350 engine i was just hoping someone could tell me the correct timing.

#667175 - 04/02/09 02:52 PM Re: Engine Timing [Re: spktay1]  
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Roadie Offline
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Wilmington,N.C
It's 6 or 8 degrees BTDC. The stock MCSS uses 6. Some older engines used 8.
Is the engine stock with the CCC?


Roadie
1986MCSS
#667182 - 04/02/09 03:16 PM Re: Engine Timing [Re: Roadie]  
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Gruvin Offline
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Texas
start with 6 degrees no matter if you are computer controlled or not... If you are not computer controlled, check this out for timing help:
http://www.gofastforless.com/ignition/advance.htm


My first SS! Sold Jan 2004
[Linked Image]
87 SS bought 9-5-04: Sold 6-18-2010 - project 87 finds a new home with another undisclosed MonteCarloSS.com member!
#667304 - 04/02/09 09:50 PM Re: Engine Timing [Re: Gruvin]  
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Aceprowler Offline
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Erie, Pa
Thanks for the heads up.

I have an 70's 4bolt 010 block and searched forever last year to find what I need the timing set to without an computer. My bud swore it was higher btdc, but I'll try mine at 6 for a while see how she runs.

Thanks again!


1984 Monte Carlo SS - "010" 4bolt 350, GN 8.5, 700R4, 3.42
#667362 - 04/02/09 11:57 PM Re: Engine Timing [Re: Aceprowler]  
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Roadie Offline
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Back in the day my 300hp 327 Chevelle had a 8 degree BTDC recommendation. I didn't know anything about setting up the advance curve back then. I did know that if I set it at 14 degrees BTDC it would run a heck of a lot quicker so that is what I ran it at.
At the drag strip, I ran it at 8 and it turned a 15.7 et. I ran it at 14 and it turned a 14.7 et. This was done on the same day. My speed in the quarter on a hot summer afternoon was typically 97 mph with a best of 99mph running at night. Back then running in C stock we were required to use a maximum width slick of 7". I ran a cheap recap "cheater" slick that got very little traction on the drag strip.

My point is that you need to set up the ignition advance curve for best performance.


Roadie
1986MCSS
#667391 - 04/03/09 12:56 AM Re: Engine Timing [Re: Roadie]  
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Chevrolord Offline
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Back in the day, they had so many different factory camshafts, I think I've seen specs from 2-4 up to 12-14.

#667638 - 04/03/09 05:02 PM Re: Engine Timing [Re: Chevrolord]  
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Roadie Offline
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The total advance and how fast it comes in, is what needs to be considered when setting up the curve. I used the stock 300hp cam at first and then switched to the 350hp 327 cam and they both seemed to need the about the same initial setting with the factory advance curve. I wish I had known how to set up the curve back then. I could have coaxed a few more hp out of the engine.

The piston rings lost their tension and it started burning oil around 60k, probably because of the advanced timing (and cheap cast iron rings) and my lead foot. This initiated a ring job. There was no detectable wear in the engine.


Roadie
1986MCSS
#667643 - 04/03/09 05:07 PM Re: Engine Timing [Re: Roadie]  
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Gruvin Offline
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A very large book could be written in ignition timing advance and timing curves. I have always found that 6 degrees BTDC was a great starting point on any engine running parts designed in the last 30 years and of course tuning is always in the best interest of the car owner. You can tune for MPG, tune for performance, tune for a blend.


My first SS! Sold Jan 2004
[Linked Image]
87 SS bought 9-5-04: Sold 6-18-2010 - project 87 finds a new home with another undisclosed MonteCarloSS.com member!
#668875 - 04/06/09 10:14 PM Re: Engine Timing [Re: Gruvin]  
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02intimidator Offline
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Matawant, NJ
Set it @ 29* btdc @ 3000 rpm. That is a good starting point.


Just your typical N/A 9 sec Street Car.
#668950 - 04/07/09 12:19 AM Re: Engine Timing [Re: ]  
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Roadie Offline
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If you are using the stock setup, the advance you get just revving the engine sitting still is way different from full throttle advance under load.

However, I read in Chevy High Performance several years ago that if you disconnect the map sensor and plug the vacuum end of the line and rev it up, the computer thinks you are at full throttle under load and you can see the appropriate advance curve.


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1986MCSS
#669015 - 04/07/09 01:53 AM Re: Engine Timing [Re: Roadie]  
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SS402 Offline
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Beaverton, Oregon
adjust the initial timing for highest vacuum and compare with a timing light, engines that require excessive advance can be a indication of poor combustion chamber design for the selected piston..


George
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