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Dynoed Hawk 525 today, had a problem...
Dynoed first engine today. With Mercury Thunderbolt ignition on, engine would rev up to 5000 RPM, the we would lose ignition.(back fire through carb) Did this 3 times in a row. New coil, sensor,cap and rotor from mercury. Does this system have a rev limiter in it??? How about in the module? Its a v8 module.... Put an MSD distributor in with a 7AL box, and engine ran perfect! Right to 5700 RPM not prob. Anyone have any answers? Need to figure this out by Monday cause engine is coming off dyno Monday afternoon.
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If you're referring to a Hawk 525sc, what was your total advance?
And is it a T bolt IV or V. The Vs all had a rev limiters built in, IVs did not. |
Its because of the thunderbolt...THEY SUCK !!!!!!
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[QUOTE=rdoactive;3094982]If you're referring to a Hawk 525sc, what was your total advance?[/QUO
It is a 525SC...28 to 30 degrees with the merc thunderbolt ignition back firing at 5000 rpm.(3 times) then installed the msd . It ran good . So we advanced to 32 then to 34 and the ignition never cut out. The HP kept climbing.....made 583HP at 5500RPM w/ msd. BTW, diff camshaft than stock from Hawk. Comp Cams cam. , this thing made good power for a 454 with a little blower!!! Had smaller pully, but never even used it. 583 HP at 5500 RPM was with the stock pulley. |
[QUOTE=kreed;3095075]
Originally Posted by rdoactive
(Post 3094982)
If you're referring to a Hawk 525sc, what was your total advance?[/QUO
28 to 30 degrees with the merc thunderbolt ignition back firing at 5000 rpm.(3 times) then the msd was good . advanced to 32 then to 34 and the ignition never cut out. The HP kept climbing.....made 583HP at 5500RPM w/ msd. BTW, diff camshaft than stock from Hawk. Comp Cams cam. , this thing made good power for a 454 with a little blower!!! Had smaller pully, but never even used it. 583 HP at 5500 RPM was with the stock pulley. Im leavin it . The small pulley will now sit on the shelf for a brighter day !!!! |
Those engines run pretty high CR, and if I remember only reccomended only about 26 degrees. I did run about 28 with a smaller pulley, a V6 Tbolt IV, on 93 octane.
The V6 module gives a lot more initial timing. Hoping you're using bushings and light springs for a short advance curve with the MSD distributor. Check the PN on the Tbolt module, mine reved over 5000rpm, no problem. |
[QUOTE=kreed;3095075]
Originally Posted by rdoactive
(Post 3094982)
If you're referring to a Hawk 525sc, what was your total advance?[/QUO
It is a 525SC...28 to 30 degrees with the merc thunderbolt ignition back firing at 5000 rpm.(3 times) then installed the msd . It ran good . So we advanced to 32 then to 34 and the ignition never cut out. The HP kept climbing.....made 583HP at 5500RPM w/ msd. BTW, diff camshaft than stock from Hawk. Comp Cams cam. , this thing made good power for a 454 with a little blower!!! Had smaller pully, but never even used it. 583 HP at 5500 RPM was with the stock pulley. Im sure it could have been something like a bad pickup in the merc distributor, etc. |
Originally Posted by rdoactive
(Post 3095114)
Those engines run pretty high CR, and if I remember only reccomended only about 26 degrees. I did run about 28 with a smaller pulley, a V6 Tbolt IV, on 93 octane.
The V6 module gives a lot more initial timing. Hoping you're using bushings and light springs for a short advance curve with the MSD distributor. Check the PN on the Tbolt module, mine reved over 5000rpm, no problem. |
Its 8.5 to 1 Comp. started at 28 degree timing and went up from there. Ended up at 34 degrees, still only making 4.55 lbs boost. So thats where the engine made most power. It just started to fall off at 5700 RPM. Dyno guy said engine is in no danger at 34 degrees.
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[QUOTE=MILD THUNDER;3095129]
Originally Posted by kreed
(Post 3095075)
That sounds good man. I have the same setup. 454, dart aluminum heads, 741 roller cams, 177 blowers, stock pulleys. They make nice power for some little motors! Compression on the hawk 525's were around 8.5:1 i think. Which is where i am with mine. I use a msd ignition. Im sure it could have been something like a bad pickup in the merc distributor, etc. |
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