Thunderbolt IV HP question

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01-20-2004, 08:26 AM

Dangerous Dave

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Thunderbolt IV HP question

Does anyone know the total advance and at what rpm a Thunderbolt IV HP is? I know they usually say right on them what it is but mine just says HP. Thanks
Dave

01-20-2004, 09:45 AM

jpclear

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Merc's pt # should be there somewhere and I suspect that it is a 17316 A1. If so, that module has a 20 deg. advance. It starts to advance above 1500 and is full in at 3000. --- Jer

01-20-2004, 09:51 AM

mopower

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Just looked at mine and I too have the V8-HP module. These were for 420hp 454s I believe. They have less advance than others , so you have more initial timing for a smoother idle. And like JP said the curve doesn't start till 1500 , while the others begin as early as 800. I switched to these last season trying to cure an idle problem.