High HP Procharged guys, need advice!

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Apr 22, 2015 | 12:37 PM

speedfreak2685

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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.

Apr 22, 2015 | 02:52 PM

ICRAZY6

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From: Lacon, IL

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.

Apr 22, 2015 | 03:40 PM

speedfreak2685

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I'm thinking I may do the same. Did they cut the other slot in your ballencer for you also?

Apr 23, 2015 | 02:32 PM

stmz28

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Mine is keyed with 2 pins. Brute speed sells a kit to pin the crank

Apr 23, 2015 | 03:08 PM

ICRAZY6

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From: Lacon, IL

Yes, the cut the slot in the balancer and crank

Apr 23, 2015 | 05:44 PM

speedfreak2685

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Quote:

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.

Apr 23, 2015 | 05:46 PM

speedfreak2685

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Quote:

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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Apr 24, 2015 | 09:29 AM

ajrothm

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From: League City, Tx

Definitely double key the crank while its apart.

Apr 24, 2015 | 10:15 AM

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LS1RedZ

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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?

Apr 24, 2015 | 10:17 AM

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speedfreak2685

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Quote:

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

Apr 24, 2015 | 11:44 AM

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LS1RedZ

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From: Waco, TX

What psi were you seeing before the motor crapped out?

Apr 24, 2015 | 01:04 PM

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speedfreak2685

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Quote:

Originally Posted by ls1redz

what psi were you seeing before the motor crapped out?

20-21

Apr 24, 2015 | 01:39 PM

#14

HP52TA

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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?

Apr 24, 2015 | 02:24 PM

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007FJ

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Procharger

Quote:

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.

Apr 25, 2015 | 10:49 AM

#16

speedfreak2685

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Quote:

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

Apr 29, 2015 | 02:30 PM

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95-1LE-Z28

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Quote:

Originally Posted by speedfreak2685

Yes six-speed. 8.65/4.13

Quote:

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?

Last edited by 95-1LE-Z28; Apr 29, 2015 at 02:39 PM.

Apr 29, 2015 | 05:47 PM

#18

speedfreak2685

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Quote:

Originally Posted by 95-1LE-Z28

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.

Apr 29, 2015 | 05:54 PM

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Bob@BruteSpeed

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Quote:

Originally Posted by speedfreak2685

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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