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High HP Procharged guys, need advice!

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Old 04-22-2015, 12:37 PM
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Default High HP Procharged guys, need advice!
I have a 370 with a f1a making 940ish for now and soon to be close to 1000. I'm in the process of tearing down the motor and wondering if somehow double keying the crank is necessary? It's s k1 crank with one key way already in it from factory and a ati dampner.
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Old 04-22-2015, 02:52 PM
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I'm not making near what you are on power but I did have my balancer double key'd to the crank. Just for peice of mind. Had it done when it was at the machine shop.
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Old 04-22-2015, 03:40 PM
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I'm thinking I may do the same. Did they cut the other slot in your ballencer for you also?
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Old 04-23-2015, 02:32 PM
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Mine is keyed with 2 pins. Brute speed sells a kit to pin the crank
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Old 04-23-2015, 03:08 PM
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Yes, the cut the slot in the balancer and crank
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Old 04-23-2015, 05:44 PM
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Originally Posted by stmz28
Mine is keyed with 2 pins. Brute speed sells a kit to pin the crank
Not easy to do with a forged crank. Machine shops have to have a special bit.
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Old 04-23-2015, 05:46 PM
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Originally Posted by ICRAZY6
Yes, the cut the slot in the balancer and crank
Cool deal. Ati said they will cut another slot in the hub for $40 so I'll get them to do that and I'll get the machine shop to put another key slot in the crank while it's out.
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Old 04-23-2015, 06:14 PM
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Originally Posted by speedfreak2685
Cool deal. Ati said they will cut another slot in the hub for $40 so I'll get them to do that and I'll get the machine shop to put another key slot in the crank while it's out.
That's a good way to do it sense you have it apart. Bob
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Old 04-24-2015, 09:29 AM
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Definitely double key the crank while its apart.
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Old 04-24-2015, 10:15 AM
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Yes def double key your setup. I had one on mine and I'm glad a checked it. It was digging into the pulley, now I have two. What size pulley setup do you have? You're a 6 speed right?
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Old 04-24-2015, 10:17 AM
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Originally Posted by LS1RedZ
Yes def double key your setup. I had one on mine and I'm glad a checked it. It was digging into the pulley, now I have two. What size pulley setup do you have? You're a 6 speed right?
Yes six speed. 8.65/4.13
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Old 04-24-2015, 11:44 AM
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What psi were you seeing before the motor crapped out?
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Old 04-24-2015, 01:04 PM
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Originally Posted by ls1redz
what psi were you seeing before the motor crapped out?
20-21
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Old 04-24-2015, 01:39 PM
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With double keying the crank, is it recommended or required to reduce the clearance fit between the ATI damper and crank? Or is this not a concern?
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Old 04-24-2015, 02:24 PM
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Default Procharger
Originally Posted by HP52TA
With double keying the crank, is it recommended or required to reduce the clearance fit between the ATI damper and crank? Or is this not a concern?
Non issue. Same as always just 100% increase in twisting resistance. Mine is not doubled up but I see the peace of mind aspect. I am at 800 with a T56.
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Old 04-25-2015, 10:49 AM
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Originally Posted by 007FJ
Non issue. Same as always just 100% increase in twisting resistance. Mine is not doubled up but I see the peace of mind aspect. I am at 800 with a T56.
Nice. I guess I'm going to do it while it's all apart for good measure
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Old 04-29-2015, 02:30 PM
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Originally Posted by speedfreak2685
Yes six-speed. 8.65/4.13
Originally Posted by speedfreak2685
20-21
I have the same pulley combo going in this year on a 408 and on e85. If you made 940hp with that combo with a 370 and a t56, that gives me a decent idea what I could put down with my combo. Solid numbers for sure.

If you don't mind me asking, what RPM were you shifting at?
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Old 04-29-2015, 05:47 PM
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Originally Posted by 95-1LE-Z28
I have the same pulley combo going in this year on a 408 and on e85. If you made 940hp with that combo with a 370 and a t56, that gives me a decent idea what I could put down with my combo. Solid numbers for sure.

If you don't mind me asking, what RPM were you shifting at?
it stopped making power around 6400ish. not sure if belt was slipping or heads wouldn't flow it or who knows what. I had a little bit of belt misalignment so maybe that was causing it to slip. Time will tell.
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Old 04-29-2015, 05:54 PM
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Originally Posted by speedfreak2685
it stopped making power around 6400ish. not sure if belt was slipping or heads wouldn't flow it or who knows what. I had a little bit of belt misalignment so maybe that was causing it to slip. Time will tell.
On a dyno graph belt slippage will typically show up with highs and lows, as the belt grabs and slips. If your graphs were fairly smooth and your blower doesn't have a lot of black (belt) dust on it, your belt probably wasn't slipping. Bob
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Old 04-29-2015, 06:03 PM
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Originally Posted by Bob@BruteSpeed
On a dyno graph belt slippage will typically show up with highs and lows, as the belt grabs and slips. If your graphs were fairly smooth and your blower doesn't have a lot of black (belt) dust on it, your belt probably wasn't slipping. Bob
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