crank 2nd keyway
#1
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Join Date: Apr 2009
Posts: 5
crank 2nd keyway
OK, here goes. I had a motor (sbc 350/671 blower 8.5 compression plan on 6#boost) built by a local "company", they build/built racing motors but I'm not sure how many blower engines they have built. Here's the rub, the motor is all together less the blower which I will put on. I have been reading up on this and every artical I read says the crank MUST have the 2nd keyway cut, well it doesn't. So has anyone ever cut one without removing the crank from the motor or is that just NOT an option. Since we are "only" running 6-7 lbs of boost do we really need the 2nd keyway? And ofcoarse these guys are no longer in bussiness and I will have to take it somewhere else to have it done. Any help out there? thanks!
#2
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Join Date: Dec 2004
Location: out of my mind in Kalamazoo, MI
Posts: 179
Re: crank 2nd keyway
Originally Posted by kenglish
OK, here goes. I had a motor (sbc 350/671 blower 8.5 compression plan on 6#boost) built by a local "company", they build/built racing motors but I'm not sure how many blower engines they have built. Here's the rub, the motor is all together less the blower which I will put on. I have been reading up on this and every artical I read says the crank MUST have the 2nd keyway cut, well it doesn't. So has anyone ever cut one without removing the crank from the motor or is that just NOT an option. Since we are "only" running 6-7 lbs of boost do we really need the 2nd keyway? And ofcoarse these guys are no longer in bussiness and I will have to take it somewhere else to have it done. Any help out there? thanks!
#4
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Join Date: Oct 2007
Location: Staunton,VA.
Posts: 254
671 blower 2nd key
checkout add #1287512. There is a lot of stress on the front of the crank when using a blower. Needs to be cut 180degrees from other key. There are wieand street kits that people buy to put on a stock engine that do so w/o pulling the engine down. I dont remember this kit for adding a key being around about 10 years ago or more. I had to make my own to cut the 2nd key in. Kris
#5
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Join Date: Nov 2003
Location: NORTHEAST
Posts: 290
All the blower eigines we have built have all had a second key way and it can't be done in the engine.
It sounds like your going to roll the dice on this one and most guys will use the BBC snout
It sounds like your going to roll the dice on this one and most guys will use the BBC snout
#6
Senior Member
RACING JUNKIE
Join Date: Mar 2003
Location: Fountain,MICHIGAN
Posts: 856
Re: crank 2nd keyway
Originally Posted by kenglish
OK, here goes. I had a motor (sbc 350/671 blower 8.5 compression plan on 6#boost) built by a local "company", they build/built racing motors but I'm not sure how many blower engines they have built. Here's the rub, the motor is all together less the blower which I will put on. I have been reading up on this and every artical I read says the crank MUST have the 2nd keyway cut, well it doesn't. So has anyone ever cut one without removing the crank from the motor or is that just NOT an option. Since we are "only" running 6-7 lbs of boost do we really need the 2nd keyway? And ofcoarse these guys are no longer in bussiness and I will have to take it somewhere else to have it done. Any help out there? thanks!
AD#1287512 in the Classisfied.
This will do what you NEED!!!
I have always Doubled Keyed My Blower
Motors,but that was because we ran in Excess of 25lbs og BOOST!
I have a Street Deal going as we Speak,and i beleive that this Fixture is going to get a Try?
Later
G 8)
#7
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RACING JUNKIE
Join Date: Mar 2003
Location: Fountain,MICHIGAN
Posts: 856
Re: crank 2nd keyway
Originally Posted by radicalz
Originally Posted by kenglish
OK, here goes. I had a motor (sbc 350/671 blower 8.5 compression plan on 6#boost) built by a local "company", they build/built racing motors but I'm not sure how many blower engines they have built. Here's the rub, the motor is all together less the blower which I will put on. I have been reading up on this and every artical I read says the crank MUST have the 2nd keyway cut, well it doesn't. So has anyone ever cut one without removing the crank from the motor or is that just NOT an option. Since we are "only" running 6-7 lbs of boost do we really need the 2nd keyway? And ofcoarse these guys are no longer in bussiness and I will have to take it somewhere else to have it done. Any help out there? thanks!
Using a Balancer on a Blower Motor is the 1st MISTAKE!!
Always use a Blower Hub,that way you have 6-Bolts on the Lower Pulley.Verses the 3-with a Balancer.
Had a Fellow Years back that would Tear Off a Steel Balancer about Twice a Month until i Double Keyed the Crank,and Installed a C/M Hub!
Later
G 8)
#8
Junior Member
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Join Date: Nov 2007
Posts: 17
2nd keyway is a darned good idea if only for piece of mind at 7 lbs.
Balancer should be one with a steel center. OEM (cast) is going to be a problem.
ATI makes them with 3 bolt chevy pattern or the 7 bolt chrysler pattern. Just depends on what style pulleys you are using.
Don't know where you are but if it helps, keyway cutting for blower hub use is something I do about once a month.
Any perf. machine shop or even a general machine shop should be able to handle this.
Dave Koehler
http://www.koehlerinjection.com
Balancer should be one with a steel center. OEM (cast) is going to be a problem.
ATI makes them with 3 bolt chevy pattern or the 7 bolt chrysler pattern. Just depends on what style pulleys you are using.
Don't know where you are but if it helps, keyway cutting for blower hub use is something I do about once a month.
Any perf. machine shop or even a general machine shop should be able to handle this.
Dave Koehler
http://www.koehlerinjection.com