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360 LA Timing For Initial Start #2893966
02/28/21 07:09 AM
02/28/21 07:09 AM
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Keizer, Oregon U.S.A.
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elmor353 Offline OP
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Just put together a 360 with 9.7 to 1 compression, Comp XE268H cam with 224in 230ex duration@ .050, .477in .480ex lift and 110 lobe separation. I'm trying to figure out what I should set the timing for initial start?

Re: 360 LA Timing For Initial Start [Re: elmor353] #2893985
02/28/21 10:09 AM
02/28/21 10:09 AM
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Lincoln Nebraska
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RapidRobert Offline
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15 BTDC. after breakin you can work with the curve & the total to stay under the pinging point.


live every 24 hour block of time like it's your last day on earth
Re: 360 LA Timing For Initial Start [Re: RapidRobert] #2893988
02/28/21 10:34 AM
02/28/21 10:34 AM
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Central Pa
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moparjim79 Offline
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Just curious, whats the rest of the drivetrain setup, and what kind of vehicle?

Re: 360 LA Timing For Initial Start [Re: elmor353] #2894046
02/28/21 01:08 PM
02/28/21 01:08 PM
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crackedback Offline
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15-20 and after it fires, bring it up to break in RPM and set timing at 35-38 and let it run. It's not going to ping with no load on it at 38* and will keep exhaust temps down.

Worry about what the operating environment timing events are after you get it broken in.

Re: 360 LA Timing For Initial Start [Re: moparjim79] #2894137
02/28/21 05:33 PM
02/28/21 05:33 PM
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Keizer, Oregon U.S.A.
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elmor353 Offline OP
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It's going in a Volare wagon, 727 w/ 2200 stall converter, 8.25 rear w/ 3.55 sure-grip. It's going to be a cruiser/parts chaser. Maybe a "little" spirited driving when possible.

Re: 360 LA Timing For Initial Start [Re: elmor353] #2894220
02/28/21 10:04 PM
02/28/21 10:04 PM
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Central Pa
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moparjim79 Offline
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You're going to love the mid range that setup is going to provide. Sounds like a great cruiser.

Re: 360 LA Timing For Initial Start [Re: moparjim79] #2894264
03/01/21 03:22 AM
03/01/21 03:22 AM
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Fulton County, PA
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CMcAllister Offline
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Initial start just to run it in? 30 or so. You might like the idle quality and crisp response so much, you'll just lock the advance out.


If the results don't match the theory, change the theory.
Re: 360 LA Timing For Initial Start [Re: elmor353] #2894419
03/01/21 03:14 PM
03/01/21 03:14 PM
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Bend,OR USA
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Cab_Burge Offline
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Originally Posted by elmor353
Just put together a 360 with 9.7 to 1 compression, Comp XE268H cam with 224in 230ex duration@ .050, .477in .480ex lift and 110 lobe separation. I'm trying to figure out what I should set the timing for initial start?

Idle timing or total timing?
Which heads are you running?
With stock iron heads I would set the initial idle timing at 14 to 18 BTDC and shoot for 32 to 34 BTDC, aluminum heads a little more, maybe, after testing to see what that motor likes scope
I haven't built or work on a SB Mopar with aluminum heads yet so no hands on experience with them yet, soon though up devil


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 360 LA Timing For Initial Start [Re: Cab_Burge] #2894515
03/01/21 06:15 PM
03/01/21 06:15 PM
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Keizer, Oregon U.S.A.
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elmor353 Offline OP
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Yeah Cab, this is only my second small block. The first being a stock 85 360 that I freshened up. We used a Speed-pro cam w/ 214in 224ex duration @ .050 .444in .466ex lift, 69 340 intake, same style 2200 stall converter, 727 and 3.91 sure-grip. It wasn't a powerhouse but, in my brother's 68 Dart was fun to drive. This engine has a point and a half more compression and a little bit bigger cam. I think my buddy will be happy with it. Figure with decent headers this should make around 330-350 hp, at least that is what the general consensus is. I read that a 350 chebby with a similar set up and same spec cam made 340 hp. Almost forgot, we are running the stock 1977 factory heads, 1.88 intake valve, with no port work, just a 3 angle valve job and 340 valve springs.

Re: 360 LA Timing For Initial Start [Re: crackedback] #2894519
03/01/21 06:19 PM
03/01/21 06:19 PM
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S.E. Michigan
ZIPPY Offline
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Originally Posted by crackedback
15-20 and after it fires, bring it up to break in RPM and set timing at 35-38 and let it run. It's not going to ping with no load on it at 38* and will keep exhaust temps down.



iagree


Rich H.

Esse Quam Videri




Re: 360 LA Timing For Initial Start [Re: crackedback] #2895123
03/03/21 09:17 AM
03/03/21 09:17 AM
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Windsor, ON, Canada
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Diplomat360 Offline
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Originally Posted by crackedback
15-20 and after it fires, bring it up to break in RPM and set timing at 35-38 and let it run. It's not going to ping with no load on it at 38* and will keep exhaust temps down.

Worry about what the operating environment timing events are after you get it broken in.


Agreed, this is a great ballpark figure.

My 360 motor has 23 initial, total mchanical of 35 by 2000 RPM, but a loose converter (4k stall) and 4.10 gearing which helps as well.

Good starting point though, then go tuning after your break-in is done, good luck!







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