Timing Specs for HP Tbolt IV module
05-24-2004, 08:52 AM
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Re: Timing Specs for HP Tbolt IV module
Mercury used seven different spark adv. modules with the T-Bolt IV. (more than that actually, if you count all three design types used) I suggest you refer to Dennis Moore's BB Chevy Marine Performance book; pages 186 thru 189 for the complete rundown. Otherwise give us the pt.# of the module in question and we can supply the specs. --- Jer
05-24-2004, 09:11 AM
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Re: Timing Specs for HP Tbolt IV module
Originally Posted by z.zuperboat
It Should Have The Advance On The Module
Anyway, I need to replace the module, coil, & trigger this weekend and set the timing. I'm guessing 32-34 total by 4000rpm should be fine but wanted to know the modules characteristics. I didn't know if there was more than 1 "HP" module.
Gary
05-24-2004, 09:28 AM
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Re: Timing Specs for HP Tbolt IV module
The V8-HP module is the only one that doesn't tell you the total advance in the designation (e.g., V8-22). The HP module has 20* of advance, which is all in by 3000 rpm. More specifically, 3.5*at1750, 13.5*at2500, 20*at3000.
Merc issued a Service Bulletin that has a TB-IV trouble shoot guide.
Merc issued a Service Bulletin that has a TB-IV trouble shoot guide.
05-24-2004, 09:29 AM
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Re: Timing Specs for HP Tbolt IV module
Gary - The HP module was 20 deg. advance all in by 3000 rpm.The only differences in the HP modules is where it is mounted- on metal plate or on distributor.
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05-24-2004, 09:31 AM
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Re: Timing Specs for HP Tbolt IV module
The serial numbers for the HP module are 390-9571A1 or 17316A1.
If you can't find the hp module I have a spare V8-24 module from a 454 mag -24 degree advance all in by 3750 rpm.
If you can't find the hp module I have a spare V8-24 module from a 454 mag -24 degree advance all in by 3750 rpm.
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05-24-2004, 09:34 AM
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Re: Timing Specs for HP Tbolt IV module
That would be the second design, V8HP unit. It starts to advance between 1500 and 1750 rpm and increases uniformly to 20 degs. at 3000 rpm. where it's full in. That is the one I use. Gives me a good 12 to 14 deg. advance at idle with 32 to 34 deg. above 3000 to wot. --- Jer
05-24-2004, 09:38 AM
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Re: Timing Specs for HP Tbolt IV module
220BR, powerguy
YES! that's the info I need. Thanks!
BTW, I went through the Merc troubleshooting scematic over the phone with the guy. THAT WAS INTERESTING! Turned out to be the module, but he said the "little comma looking thing" in the distributor was corroded too.Gary
YES! that's the info I need. Thanks!
BTW, I went through the Merc troubleshooting scematic over the phone with the guy. THAT WAS INTERESTING! Turned out to be the module, but he said the "little comma looking thing" in the distributor was corroded too.Gary
