total timing
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total timing

  1. #1
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    Default total timing

    Have a merc 600 SC (502). Only upgrades are superchiller, hyd roller cam, 750 carbs, Brodix race-rite BB2 plus heads. What total timing should I set it at. The stock 600SC was 33 BTDC.

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  3. #2
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    I would not go over 33.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    I actually am not a fan of too much timing (gain not worth it) but I heard to little will get the exaust to hot on a supercharged application. What is your prefered timing range, Thanks

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    The chamber design of the head you have is much better then OEM. Better chamber means better flame travel which means better combustion. With this said you should need less timing to ignite the flame front. I would say 30 to 32 would be optimal and safe on 93 octane.


    Just curious how much split at say .050" does the camshaft have?
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Thanks, I have the cam card at home. Ill post specs tomorrow.

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    Quote Originally Posted by blown daytona View Post
    Have a merc 600 SC (502). Only upgrades are superchiller, hyd roller cam, 750 carbs, Brodix race-rite BB2 plus heads. What total timing should I set it at. The stock 600SC was 33 BTDC.
    Set at 32 and lets go Boating Sunday

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    Just went on the crane cams website. Going by memory (6 years ago I installed the cam) I think it was 112, outside possibility was 114. Teague sold me the upgrades back then(except the heads, which I just installed last month). So if you know what he prefers? Ill dig out the cam card when I get home Thanks

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    Quote Originally Posted by SuperSoaker View Post
    Set at 32 and lets go Boating Sunday
    I am shoting for sunday. Maybe the last chance to get out. Im probably going to be forced to launch at the Navy Rec Center because my little truck may not get the boat back out on other ramps. Hope to see you out there!!!

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    hope the water is flat for that end of the river so we can do another Bay run

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    21 Daytona Outlaw's Avatar
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    All my research shows to start out @ 28 and creep up on it.
    #55

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    BTC cardcarrying member SuperSoaker's Avatar
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    What did you go with 30/32???

    Sunday is looking good

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    Havent set it yet, Just so happens when I dropped the distributer in it landed at 28. Ill do it Sunday when I pull it out of the garage. What ever I get closest to on the 1st try 31-32. Im not going to run it hard. I just want to make sure everything is good and Ill fine tune it next year

  15. #13
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    Quote Originally Posted by cstraub View Post


    Just curious how much split at say .050" does the camshaft have?

    112 lobe center, lift: .610 I, .632 E Duration @ 50: 236 intake 244 ex. 8:1 Compression ratio with approx 10 lbs boost.

  16. #14
    steelcomp was here
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    That much boost with pump gas I wouldn't run over 30 to start, and creep up on it if you want more. I would guess you'll only gain a few hp if any.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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