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Author
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Topic: Stress relieving;waste of time for high rpms?
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powrshftr
Journeyman Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 06-03-2003 08:30 PM
   
Maybe Alex or some of the other guys who race for a living will have some experience with this... Will stress relieving the block,(and possibly the crank and rods) have any positive effect on durability,or is it just a waste of time.I can get the work done very cheap by a friend who manages a local company that provides stress relieving services for local oil refineries.I didn't just pick this one out of thin air,I came across it in some reference material.Thanks guys.------------------
DRIVE IT LIKE YOU STOLE IT!!!!!!!!!!!
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powrshftr
Journeyman Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 06-03-2003 10:36 PM
P.S. How did things end up at the races?I hope those NHRA guys are all married to fat,ugly,mean,bitchy,smelly toothless women.Guess my buddy was onto somethin' when he said "ya' know what N.H.R.A. stands for?...NO HOT RODS ALLOWED."Also,you should be getting an email from me regarding some parts soon.Thanks,
Scott------------------
DRIVE IT LIKE YOU STOLE IT!!!!!!!!!!!
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RonnieT
Gearhead Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99
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posted 06-03-2003 10:56 PM
Stress relieving is typically done on parts before the final machining is completed. Cast parts such as the block have no inheirent stresses, so stress relieving is usless. i think that poilshing the beams on the rods and ensuring the crank journals have a good radius would be a better investment. Most of the crank failures I have seen have started at stress risers at corners due to the radius not being sufficient.------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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indyphil
Gearhead Posts: 2398
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 06-04-2003 09:22 AM
Not sure what you mean by cast parts have no internal stresses. I thought They can pick up residual stress as they cool. I heard that using a "seasoned" block (such as an old truck block that has done some haulin') is good for this reason. Maybe I just heard wrong.
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 06-04-2003 09:41 AM
If at all possible, it should ALWAYS be done as part of the machining process.
Years ago all of the manufacturers used to do it to the HP engine parts.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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powrshftr
Journeyman Posts: 77
From: Sarnia,Ontario,Canada
Registered: Apr 2003
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posted 06-04-2003 06:59 PM
Thanks Alex,I kinda thought so,but nobody around here builds much more than "RV cam" type of crap,so I couldn't get an intelligent answer!Talk to you soon!
Scott------------------
DRIVE IT LIKE YOU STOLE IT!!!!!!!!!!!
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RonnieT
Gearhead Posts: 827
From: Port Allen, La. 70767
Registered: Jun 99
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posted 06-05-2003 06:30 PM
Maybe saying no stress was wrong, but cast parts have very low residual stress when compared to forged or cold worked materials. I have dicussed this with the metallurgist at work on some of the equipment. There are more stresses introduced into a block by the accessories and parts that are bolted on than are there from the manufacturing. When I have the metallurgist cornered one day I'll ask him about the benefits of stree relieving engine parts. He did work for a automaker at one time. ------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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