Yella Terra failure
#4
11 Second Club
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Pay a visit to Harland Sharp or upgrade the stock rocker arms to bronze bushings.
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Coonass350 (12-01-2023)
#9
11 Second Club
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#13
TECH Senior Member
#14
The Scammer Hammer
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Bronze wears slowly. Powdered metal... Once it starts to wear, it's very quick. AFR says stock (bushing upgraded) rockers are fine. I ran them on my AFR 205's @ .631 lift.
I'll run them on AFR 260's @ .632 lift if I wind up getting them.
That's just the conversation we had. When I was thinking about having Darin do my LSA's (and I still might) he wanted me to go with CHE guides and stock rockers.
I'll run them on AFR 260's @ .632 lift if I wind up getting them.
That's just the conversation we had. When I was thinking about having Darin do my LSA's (and I still might) he wanted me to go with CHE guides and stock rockers.
#15
TECH Apprentice
iTrader: (1)
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I never cared for those rockers. You can see from the pics that the metal crystalized. Metals will crystalize under wear and stress and fracture along the crytalization line. In otherwords, the metal or heat treating process was below the grade for the anticipated stress.
Since this did not happen to all of the rockers, it tells me Yella Terra has either quality control problems or engineered the product too close to the safety line to save money. Well engineered products engineer in a safety factor of 20% greater than the anticipated loading.
Look at Cranes, Howards, or Crower if you think you should stick with a roller tip.
Since this did not happen to all of the rockers, it tells me Yella Terra has either quality control problems or engineered the product too close to the safety line to save money. Well engineered products engineer in a safety factor of 20% greater than the anticipated loading.
Look at Cranes, Howards, or Crower if you think you should stick with a roller tip.
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grinder11 (10-02-2021)
#16
TECH Senior Member
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Bronze wears slowly. Powdered metal... Once it starts to wear, it's very quick. AFR says stock (bushing upgraded) rockers are fine. I ran them on my AFR 205's @ .631 lift.
I'll run them on AFR 260's @ .632 lift if I wind up getting them.
That's just the conversation we had. When I was thinking about having Darin do my LSA's (and I still might) he wanted me to go with CHE guides and stock rockers.
I'll run them on AFR 260's @ .632 lift if I wind up getting them.
That's just the conversation we had. When I was thinking about having Darin do my LSA's (and I still might) he wanted me to go with CHE guides and stock rockers.
#18
TECH Addict
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This used to be a really common problem with aluminum rocker arms in general, in race motors they used to toss them out after a season or less of use.. Way back ,, engine builders really avoided the AL rockers because street drivers would run them too long.
#19
TECH Senior Member
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I don't think many guys realize how limited a lifespan aluminum rockers have compared to steel ones. They fatigue out. Same as with aluminum connecting rods.
#20