383 timing with 6" rods - Team Camaro Tech
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post #1 of 5 (permalink) Old Apr 23rd, 04, 07:46 PM Thread Starter
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Just curious, I did a search and didt find any info about a 5.7" rod 383 vs a 6" for timing. My 383 runs fine with 14 initial 32 total but runs stronger with 18 initial and 36 total. I just keep it at lower timing to avoid detonation. Could it be the 6" rods make my engine the exception to the 32-34 rule for 383s? I know the stroke of the 383 over the 350 increases piston speed. Which is mainly why it needs less timing, but with the longer rods doesnt it slow the piston down a bit? Just curious to hear any info on this.
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post #2 of 5 (permalink) Old Apr 24th, 04, 09:11 AM
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On the dyno my 383 with 6" rods was happiest with 34 degrees total advance.

Mike - '68 Camaro with lots of stuff done to it.

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post #3 of 5 (permalink) Old Apr 24th, 04, 10:02 AM
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It is possible it would wrong strongest with 18* initial and 32* total. A few dyno runs or drag strip passes is the only way to know for sure. But either way, your in the ballpark.

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post #4 of 5 (permalink) Old Apr 24th, 04, 01:56 PM
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If you test it at the track look at your MPH to find best timing, not ET.

Combustion chamber shape has more to do with how much timing an engine likes than rod length.

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #5 of 5 (permalink) Old Apr 24th, 04, 02:07 PM
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I agree with Eric, the cumbustion chamber has much more to do with timing requirements than rod length, in this case.

Mine is happiest with 31-32* total, 16 initial with 10 added using manifold vacuum, as tested on a chassis dyno.

Most aftermarket heads work well with 34-36* total. The Vortec style combustion chamber (not the E-tec) works with a few degrees less.

If you have a true 11.2:1 compression ratio detonation may be hard to avoid depending upon the camshaft. A DCR would be a good check.

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