Rocker to spring clearance
#1
Member
JUNIOR BUILDER
Thread Starter
Join Date: Apr 2007
Location: West Palm Beach, Florida
Posts: 71
Rocker to spring clearance
Building a SBC. Isky EZ roll solid lifters, Comp Gold 1.6 rockers and 1.550 springs.
7.950 pushrods give good geometry, but I end up with only .025 clearance between the retainer and the rocker arm.
Is this enough or do I need to look at lash caps or other solution for more clearance?
Steve
7.950 pushrods give good geometry, but I end up with only .025 clearance between the retainer and the rocker arm.
Is this enough or do I need to look at lash caps or other solution for more clearance?
Steve
#4
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JUNIOR BUILDER
Thread Starter
Join Date: Apr 2007
Location: West Palm Beach, Florida
Posts: 71
Thanks guys. I'm in a quandary. Probably going to look at other rocker arms. I have .045 locators with a 1.900 install height. I hate to trash these rockers or put floating aluminum in the pan.
Steve
Steve
#6
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JUNIOR BUILDER
Thread Starter
Join Date: Apr 2007
Location: West Palm Beach, Florida
Posts: 71
I'm getting a lot of input on this. Most recommend a minimum of .040 to .050 clearance between the rocker and the retainer/spring.
I'm curious as to what happens with less? Am I sure to make contact with the rocker with only .025? It is a blower motor and won't see more than 7000 RPM.
Steve
I'm curious as to what happens with less? Am I sure to make contact with the rocker with only .025? It is a blower motor and won't see more than 7000 RPM.
Steve
#7
Senior Member
DYNO OPERATOR
Join Date: Jan 2004
Location: central Illinois
Posts: 459
Rocker
Better not take the chance. Heat expansion can change clearances.
There is nothing wrong with adding clearance by carefully removing material from the rocker arm. Just don't let any particles get into the trunnion or roller tip area. Tape them off if you have to. Rinse them afterward and soak them in oil to pre lube them.
You should be able to do a full set in less than an hour.
There is nothing wrong with adding clearance by carefully removing material from the rocker arm. Just don't let any particles get into the trunnion or roller tip area. Tape them off if you have to. Rinse them afterward and soak them in oil to pre lube them.
You should be able to do a full set in less than an hour.
#9
Originally Posted by ssym
I'm getting a lot of input on this. Most recommend a minimum of .040 to .050 clearance between the rocker and the retainer/spring.
I'm curious as to what happens with less? Am I sure to make contact with the rocker with only .025? It is a blower motor and won't see more than 7000 RPM.
Steve
I'm curious as to what happens with less? Am I sure to make contact with the rocker with only .025? It is a blower motor and won't see more than 7000 RPM.
Steve
Curtis
#10
WOW ! :shock: :shock: :shock: :shock: :shock: :shock: :shock:
http://www.youtube.com/watch?v=a-fs8CFnZ_g
WHAT action makes the valve spring rotate like this ?!!!
http://www.youtube.com/watch?v=6Vz4mjPKXJ0
http://www.youtube.com/watch?v=a-fs8CFnZ_g
WHAT action makes the valve spring rotate like this ?!!!
http://www.youtube.com/watch?v=6Vz4mjPKXJ0