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Old 01-29-2010, 08:23 PM
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locked out timing

What is the advantage or disadvantage of locked out timing?
street strip chevy 355, 284 cam 3000 stall, 195 heads, 750hp 150 nitrous. Run 37*. I do have a timing control that will let me knock it down on start.

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Old 01-29-2010, 08:37 PM
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Quote:
Originally Posted by tomthecomic
What is the advantage or disadvantage of locked out timing?
street strip chevy 355, 284 cam 3000 stall, 195 heads, 750hp 150 nitrous. Run 37*. I do have a timing control that will let me knock it down on start.
No reason w/that combo, IMO. Locked timing is used in race-only engines, mainly. A street engine sees much more variation in use, so you need an adjustable (centrifugal and vacuum) timing curve to allow for the needed flexibility. Race engines don't have this problem and can sometimes be set at max advance since they live at high RPM.

What do you base those HP estimates on, or is that a 750 HP carb you're talking about?
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Old 01-29-2010, 08:49 PM
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carb

yes it is a 750 hp holley, I bet you thought I was crazy. I have 308 to the rear on motor. I have my timing in at 3000 do you think that is good or go lower 2400?
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Old 01-29-2010, 09:01 PM
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Quote:
Originally Posted by tomthecomic
yes it is a 750 hp holley, I bet you thought I was crazy. I have 308 to the rear on motor. I have my timing in at 3000 do you think that is good or go lower 2400?
I don't know about crazy, but I was gonna try and see if you'd give the specs out for the cam!! lol

3000 might be a little high, but a LOT depends on the gears, weight, use, gas, etc. Hard to just say more will work- but IF the engine and gas will tolerate the timing in sooner, you could do it.

I'd at least try to bring it in a little sooner, until you get indications of detonation- then back it down some until you're safe.
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Old 01-30-2010, 08:28 PM
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Locking out the distributor advance is very effective on some street motor combos. Especially with long duration cams with lots of overlap.

Can you be more specific on the 284 cam? Cam specs.

how much inital base idle timing do you run? What distributor?

If you want to tryout the timing locked its easy to do and to reverse it again if you don't like it.

With cam specs I can advise further.
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