Ignition timing small block chevy
08-08-2004, 12:10 PM
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Ignition timing small block chevy
Whats the correct initial and total timing (3000 rpm?) for a chevy 350 small block. Mine are Volvo 350 cubes, 270 hp. Volvo info sheets show either 6 or 8 degrees initial and 23-24 at 3000. Yet another Volvo sheet shown 30 total timing. Whats up with that? The engines are stock. Don't want to burn parts with too much advance but I've gotta get all the power these little things can produce. Oh yea, they can't get the plug gaps straight either....some info sheets show 28th and some 35th. Using ACMR43Ts.
Help!!!!!
Help!!!!!
08-08-2004, 07:19 PM
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Re: Ignition timing small block chevy
what fuel do you run? what is the compression ratio and more importantly the cranking pressure? if it is a non vortec motor optimal is going to be somewhere between 34 and 36 FULL advance with a non quench / swirl cylinder head design...
vortec cylinder heads, due to the quench and turbulance created prefer 29 - 32*
AC delco R43T and TS should be gapped at .035... with an electronic ignition system...
adding more total advance may induce detonation and destroy the engine if you are not running enough octane for the engine design and load imposed on them... hence reducing full advance eliminates this issue but also kills power
forget initial timing altogether.. set total advance and let the initial fall where it may.. as long as it is enough to get her to idle well
vortec cylinder heads, due to the quench and turbulance created prefer 29 - 32*
AC delco R43T and TS should be gapped at .035... with an electronic ignition system...
adding more total advance may induce detonation and destroy the engine if you are not running enough octane for the engine design and load imposed on them... hence reducing full advance eliminates this issue but also kills power
forget initial timing altogether.. set total advance and let the initial fall where it may.. as long as it is enough to get her to idle well
08-08-2004, 07:50 PM
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Re: Ignition timing small block chevy
On the dyno my SBC made peak hp with timing set at 36*. I have played around with timing and I get the same top end RPM/Speed with timing set at 34* as I do with timing set at 36*. 34 is safer and just as fast so that is where I am at.
08-09-2004, 03:55 AM
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Re: Ignition timing small block chevy
Originally Posted by jaroot
vortec cylinder heads, due to the quench and turbulance created prefer 29 - 32*
AC delco R43T and TS should be gapped at .035... with an electronic ignition system...
AC delco R43T and TS should be gapped at .035... with an electronic ignition system...
BH
08-09-2004, 07:08 AM
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Re: Ignition timing small block chevy
My 1988 350 Mag, 270 hp, runs timing at 32* max @ 3800 rpm (8* initial) and the plugs are gapped at .035.
I set timing for max advance and don't worry about the initial setting.
I set timing for max advance and don't worry about the initial setting.
08-09-2004, 09:25 AM
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Re: Ignition timing small block chevy
Originally Posted by Iggy
My 1988 350 Mag, 270 hp, runs timing at 32* max @ 3800 rpm (8* initial) and the plugs are gapped at .035.
I set timing for max advance and don't worry about the initial setting.
I set timing for max advance and don't worry about the initial setting.
Roby
08-09-2004, 10:26 AM
#8
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Re: Ignition timing small block chevy
Running Merc Thunderbolt IV ignition. Module is the V8-24, full advance is in @ 3750 RPM. T-Bolt IV system doesn't use a centrifugal advance, fully electronic.
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