Any Issues with Locked-out timing - Chevelle Tech
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post #1 of 22 (permalink) Old Mar 21st, 06, 6:03 AM Thread Starter
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Darren
 
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Any Issues with Locked-out timing

I was thinking about locking out the timing on my car. The last several years its been just street driven, but I'm hoping to find some time this year to get a couple of outings down the 1320.

I'm using a 6AL MSD box, a 85551 Pro-Billet distributor and an MSD 8970 Multi-step retard box with a 25 degree retard start (which I will use).

I was wanting to cleanup the idle a little and looking for abit more low speed throttle response.

Is there any other issues with running locked out timing on the street other than starting?

Thanks in advance.

Darren
1971 Chevelle
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post #2 of 22 (permalink) Old Mar 21st, 06, 10:31 AM
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Re: Any Issues with Locked-out timing

I just locked out the timing on my Camaro. same box and Pro Billet dist. I have 14:1 compression, and at least in my shop, it has no problems starting. I use a summit mini starter. I guess if the engine were real hot it may, but not so far. I run 37-38*. It idles MUCH better, I can't see any drawbacks. You do not have a vacuum advance, right?

Jay Campbell
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post #3 of 22 (permalink) Old Mar 21st, 06, 11:06 AM
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Re: Any Issues with Locked-out timing

Same box, same distributor, MSD crank trigger...locked at 37 degrees.
No problems starting...hot or cold. No start retard box either.

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post #4 of 22 (permalink) Old Mar 21st, 06, 11:46 AM Thread Starter
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Re: Any Issues with Locked-out timing

Quote:
Originally Posted by jbird
You do not have a vacuum advance, right?
Jay,

Correct, no vacuum advance.

I wasn't sure weather I would need the start retard hooked up or not, I figured I have it, might as well use it.

I don't have near the compression that you do, only 10:1. I'm also using a Tilton mini started with a 1000 cold cranking amp battery.

I was going to shoot for about 37 to 38 degrees locked.

Also..............if I do decide to lock the timing, I do away with the springs and weights right?

Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems HP1000
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Mosier axles
30x12.5 ET Street Radial
525++ rwhp
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post #5 of 22 (permalink) Old Mar 21st, 06, 11:48 AM
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Re: Any Issues with Locked-out timing

No Issues With Mine Locked Out At 38 Degrees. Msd 6al And Dist. And Timing Computer And Retard Control.

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post #6 of 22 (permalink) Old Mar 21st, 06, 12:17 PM
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Re: Any Issues with Locked-out timing

Quote:
Originally Posted by 71454Chevelle
Jay,

Correct, no vacuum advance.

I wasn't sure weather I would need the start retard hooked up or not, I figured I have it, might as well use it.

I don't have near the compression that you do, only 10:1. I'm also using a Tilton mini started with a 1000 cold cranking amp battery.

I was going to shoot for about 37 to 38 degrees locked.

Also..............if I do decide to lock the timing, I do away with the springs and weights right?
Yes, look in your documentation for the instructions. It's an easy deal, but you do have to remove and reinstall the dist. gear. Not a big deal at all.

Jay Campbell
Campbell Competition Motorsports
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post #7 of 22 (permalink) Old Mar 21st, 06, 1:54 PM
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Re: Any Issues with Locked-out timing

I have 3 engines/cars all locked out.I like the idle alot better.I would hook up the retard .it just makes it easy on the starter!!
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post #8 of 22 (permalink) Old Mar 21st, 06, 2:02 PM
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Re: Any Issues with Locked-out timing

mines locked out as well, my start retard only retards 10* but i do use it.

2 possible drawbacks i noticed when i locked it out. The thing is harder to start when its cold and been sitting a while but not a big deal. The other thing is that if my battery doesn't have a pretty good charge it will just crank and never fire. Its not like other motors were if the battery is low and is cranking slow it will just fire right before the battery gives out. I got stuck in the staging lanes cause my bottle heater was on and took too much juice . But it looks like you have a better battery so go for it, ill never run a curved distributer again.

Kyle
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post #9 of 22 (permalink) Old Mar 21st, 06, 7:11 PM
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Re: Any Issues with Locked-out timing

I have mine locked out as well, 34 degrees. Idle quality & throttle response are great. No real issues with cold starts even though I have a retard box that kicked the bucket after only one year of service

Ron
68 Chevelle Conv. HT383 430HP/490TQ 9.5/1 Comp, Vortec Heads, LT4 Hot Cam, RPM Air Gap Intake, Demon 750 Mech. Sec, MSD Ignition. Trans - 2004r. Converter - CK Performance 3000 w/Lockup. Rear - 3.73 10 Bolt Posi, Nitto Drag Radials 275/50/15.
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post #10 of 22 (permalink) Old Mar 21st, 06, 9:22 PM
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Re: Any Issues with Locked-out timing

I did not realize this was such a popular thing to do. What are the benefits of locking out the timing? What circumstances cause this to be better than a curve? I have the same box and distributor (8555) and with the curve being so easy to custumize...why lock it out?

Jim M.
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post #11 of 22 (permalink) Old Mar 21st, 06, 10:57 PM
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Re: Any Issues with Locked-out timing

I locked mine out, and the whole deal just became so much more stable, idled better, everything better except maybe gas milage. It is a breeze to put the timming light on it now. Just try it with a solid roller from a dragster motor with the weights jumping all over the place. Impossible to time.

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post #12 of 22 (permalink) Old Mar 22nd, 06, 1:45 AM
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Re: Any Issues with Locked-out timing

I locked mine out one day at the track (MSD HEI Pro Billet) when I noticed it was about 15 mph slow. Turned out the weights were binding up so I just locked it out at 36*. Been running great for over 5 years since. The car idles rock steady now also. Throttle response didn't really improve, but I think it's in the carb. Oh, no starting probs either.... Kragen battery and Delco starter.

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post #13 of 22 (permalink) Old Mar 22nd, 06, 11:03 AM
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Re: Any Issues with Locked-out timing

I don't understand how a car idles at 36*. How is that possible?

Jim M.
'67 Velle
468
th-400
12-bolt,4.10s
My Chevy...
The Velle 468 Int

"It's all in the smoke!"
Video 1 Video 2

No time slips yet, 2013!!!
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post #14 of 22 (permalink) Old Mar 22nd, 06, 11:27 AM
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Re: Any Issues with Locked-out timing

Quote:
Originally Posted by Pro67Chevy
I don't understand how a car idles at 36*. How is that possible?
Very simple and does so well.
Is your vacuum advance plugged into a manifold vacuum source? Almost the same results...with the engine at idle.
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post #15 of 22 (permalink) Old Mar 22nd, 06, 12:05 PM
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Re: Any Issues with Locked-out timing

Car is not running yet but it will have no vac advance. I knew it bumped it a few degrees but I didn't realize it was that much. Maybe locked-out timing is worth playing with when I'm done.

And there is no pinging? I will be running 94 octane with 10.7 comp. closed chamber heads and small dome pistons.

Jim M.
'67 Velle
468
th-400
12-bolt,4.10s
My Chevy...
The Velle 468 Int

"It's all in the smoke!"
Video 1 Video 2

No time slips yet, 2013!!!
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