background: SADI roller cam
Thread Starter
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
background: SADI roller cam
Some bona fide professional background on the ADI / SADI material as used in some roller camshafts.
Rather involved engineering treatise on Austempered Ductile Iron including Selective (SADI)
the link below is a Download of 16-page PDF of 2006 paper by R.A. Harding
http://www.kovmat.sav.sk/full.php?rr=45&cc=1&ss=1
Rather involved engineering treatise on Austempered Ductile Iron including Selective (SADI)
the link below is a Download of 16-page PDF of 2006 paper by R.A. Harding
http://www.kovmat.sav.sk/full.php?rr=45&cc=1&ss=1
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
My whole take on the cam failures on engine breakin. In years past it was unheard of back when the steel industry in America was alive and well. Then about 20 years ago cam companies started buying low grade steel cam cores and they knew that they had a problem. So they came up with the heat treated hardening idea called "Austempered". So now you had a slightly harder ductile iron cam. The failures continued to happen even with the most meticulous builds with the best assembly lubes. They try and put the blame on new emission friendly motor oils. But the root of the problem is crappy metal in the original cam blanks that is only partially solved by heat treatment. I was also bit in the *** with a Comp Cams XE H-roller Austempered cam.
After that fiasco I only buy the Billet steel cams and you don't have to worry even with big solid roller cam springs.
After that fiasco I only buy the Billet steel cams and you don't have to worry even with big solid roller cam springs.
Thread Starter
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
I like the billet steel rollers GM has used in OE serial production motors.
? y'all remember that Cast Iron OE flat tappet cam you pulled from a fifty-year-old chevy V8 ?
? remember how the casting had a raised "CWC" logo in-between lobes ?
? remember how that name-brand cast iron hi-po cam you replaced it with had that same "CWC" logo ?
Here is foundry where those cast iron cores aka blanks came from ... both then ... and now ... pioneers of automotive SADI
http://www.cwctextron.com/history.html
fyi ... textron is a behemoth
? y'all remember that Cast Iron OE flat tappet cam you pulled from a fifty-year-old chevy V8 ?
? remember how the casting had a raised "CWC" logo in-between lobes ?
? remember how that name-brand cast iron hi-po cam you replaced it with had that same "CWC" logo ?
Here is foundry where those cast iron cores aka blanks came from ... both then ... and now ... pioneers of automotive SADI
http://www.cwctextron.com/history.html
fyi ... textron is a behemoth
Last edited by jackson; Mar 4, 2019 at 06:55 PM.
