How much HP/TQ will a GM Crank handle ?
03-09-2006, 08:38 AM
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Re: How much HP/TQ will a GM Crank handle ?
Not a question of if but when Rob. Years ago I learned of what is referred to as an S harmonic. It will either happen on 1, 3, and 5 or on 2 and 4. The bearings on either combination will show signs of the crank flexing. GM cranks are brittle and will micro fracture. One of my customers that runs 470 CID truck pull engines magnaflux's his customers cranks every year when they come down. These engines see 9500 rpm some of them and make around 800HP. He has had 2 failures of GM cranks but both had Fluid's on them. He doesn't like fluids. He has out of 7 engines 2 left with GM steel cranks that he feels are on borrowed time after 6 years of torture.
Pulling the pans and checking the bearings will tell you the most. Having the cranks mag'd is a very good idea.
Pulling the pans and checking the bearings will tell you the most. Having the cranks mag'd is a very good idea.
03-09-2006, 01:10 PM
#12
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Re: How much HP/TQ will a GM Crank handle ?
Originally Posted by cstraub
Not a question of if but when Rob. Years ago I learned of what is referred to as an S harmonic. It will either happen on 1, 3, and 5 or on 2 and 4. The bearings on either combination will show signs of the crank flexing. GM cranks are brittle and will micro fracture. One of my customers that runs 470 CID truck pull engines magnaflux's his customers cranks every year when they come down. These engines see 9500 rpm some of them and make around 800HP. He has had 2 failures of GM cranks but both had Fluid's on them. He doesn't like fluids. He has out of 7 engines 2 left with GM steel cranks that he feels are on borrowed time after 6 years of torture.
Pulling the pans and checking the bearings will tell you the most. Having the cranks mag'd is a very good idea.
Pulling the pans and checking the bearings will tell you the most. Having the cranks mag'd is a very good idea.
Chris thanks for the hookup on the Balancers!!
Rob
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03-09-2006, 01:27 PM
#14
Re: How much HP/TQ will a GM Crank handle ?
Originally Posted by docmanrich37
I would say as much as these little shiney things can throw at them.Like to see them someday.Strip what P.R. are you doing these year ?
I still like your belt tensioner better. My belt flaps pretty good .I figure Tickfaw and Royalpurple In Lousinia May and June
Emerald beach Poker run,Destin FLin August
I am waiting on the New B Max HT drives ..I have none now
and we have a locall powerrun/party here that looks like I am going to miss.Rob
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The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
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The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
03-09-2006, 03:36 PM
#15
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Re: How much HP/TQ will a GM Crank handle ?
Rob,I don't personally know how much hp a stock 1053 gm crank will take BUT a few years ago I was at Baker Engineering in Nunica,Mi getting a circle track car chassis dynoed and they had at least 10 if not more gm bbc steel cranks lined up against the wall broken off clean on various rod journals. The shop manager told me that most of them were out of boat motors . What are you using for lifters,springs and rocker arms to crank your motor up to 6300? What kind of spring pressures? My motor is set to buzz to 6000 rpm's (limiter) but Tyler Crockett told me to try to stay below 5800 because Hyd roller cams didn't "like" the high rpm's. I have touched the rev limiter at 6000 when running a 30 pitch and it didn't seem any different than 5800,Smitty
. What are you using for lifters,springs and rocker arms to crank your motor up to 6300? What kind of spring pressures? My motor is set to buzz to 6000 rpm's (limiter) but Tyler Crockett told me to try to stay below 5800 because Hyd roller cams didn't "like" the high rpm's. I have touched the rev limiter at 6000 when running a 30 pitch and it didn't seem any different than 5800,Smitty
03-09-2006, 04:13 PM
#16
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Re: How much HP/TQ will a GM Crank handle ?
Originally Posted by cstraub
Not a question of if but when Rob. Years ago I learned of what is referred to as an S harmonic. It will either happen on 1, 3, and 5 or on 2 and 4. The bearings on either combination will show signs of the crank flexing. GM cranks are brittle and will micro fracture. One of my customers that runs 470 CID truck pull engines magnaflux's his customers cranks every year when they come down. These engines see 9500 rpm some of them and make around 800HP. He has had 2 failures of GM cranks but both had Fluid's on them. He doesn't like fluids. He has out of 7 engines 2 left with GM steel cranks that he feels are on borrowed time after 6 years of torture.
Pulling the pans and checking the bearings will tell you the most. Having the cranks mag'd is a very good idea.
Pulling the pans and checking the bearings will tell you the most. Having the cranks mag'd is a very good idea.
03-09-2006, 06:42 PM
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Re: How much HP/TQ will a GM Crank handle ?
Originally Posted by articfriends
What are you using for lifters,springs and rocker arms to crank your motor up to 6300? What kind of spring pressures? My motor is set to buzz to 6000 rpm's (limiter) but Tyler Crockett told me to try to stay below 5800 because Hyd roller cams didn't "like" the high rpm's. I have touched the rev limiter at 6000 when running a 30 pitch and it didn't seem any different than 5800,Smitty
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