Correct Timing Module for carb 5 HP-500
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Looking for timing specs and the proper module number for carbed HP-500's with Thunderbolt-4 ignition. It appears there may be 2 diff modules in now with diff curves, but same total advance.
Help would be greatly appreciated.
Help would be greatly appreciated.
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If you got to www.mercruiserparts.com you can look up the engine by serial # and check to which module was used on it. I think it should be the HP module with 20* of advance.
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The TB IV ignition amp for the gen V HP500 merc part # 17316A1
is different then the TB IV ignition amp for the gen V 454/502 merc part #15248A1
Also the really early Gen V TB IV HP500 used 17316A2 but this was more like a big square box looks like a crane cap discharge thing , dif than the standard merc ignition amp on the triangular plate
is different then the TB IV ignition amp for the gen V 454/502 merc part #15248A1
Also the really early Gen V TB IV HP500 used 17316A2 but this was more like a big square box looks like a crane cap discharge thing , dif than the standard merc ignition amp on the triangular plate
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There are seven different modules available from Merc with advances that range from 14 deg. (used stock in V-6's but sometimes also in extreme hi-perf V-8's with idling problems) to 24 deg. The part you mention has a 20 deg. adv. With that one you would set the initial timing at 14 deg. adv to give you 34 deg. final at 3000 rpm. All pt.#'s and detailed info in Dennis Moore's "BIG BLOCK CHEVY MARINE PERFORMANCE" Hope this helps more than it confuses. --- Jer
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