rocker arms
Thread Starter
Launching!
Joined: Jan 2010
Posts: 201
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From: NJ
rocker arms I had purchased summit racing roller rockers and had one break about 500 miles after installation. The push rod had actually pushed through the rocker arm and the piece of aluminum was laying in the head. Luckily there was no damage done so I put a new one on that summit sent me. I figured it was a fluke and wouldn't happen again. 3 days later I went out and was driving my car and heard a tapping noise and felt like i lost power again. Today I took off my valve covers and a different rocker arm was broken same exact way as the last time. I took them all off and put the stock rockers back on. I can't believe this happened and just wanted to know if anyone else had similar experiences with summit rockers? I am assuming the are cheap quality and my set up is too aggressive for them. I am debating on buying harland sharps or just leaving the stock rockers on. I am just worried about buying the harlands and running into the same issues. Can anyone share there experiences or opinions? I was told roller rockers add about 12 rwhp I would hate to lose that power but I am now paranoid about breaking more rockers and damaging my motor.
Yah, I asked in order to check to see if it was an application issue. @ 1.7:1, it is not. Sorry, to hear about the problem. I have to agree w/ above, stock w/ the trunnion upgrade is the best solution.
Mine use the hillbilly stile trunnion upgrade; tach welded bearing retainers. The Comps are a better solution.
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Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
The cheap roller rockers do this all the time. The people selling them to you aren't gonna tell you about it though. Those blue Scorpions are the worst pieces of crap ever.
If you are dead set on roller rockers, send Tony Mamo from AFR a PM. Have seen threads where he talks about a new design that is supposed to have solved their problems.
For me, they're just not worth the cost. IMO, best thing about a roller rocker is the narrower valve stem wipe pattern on the valve tip that is possible. Just can't get that from a stocker, due to its' geometry. Up until the new roller rocker, that AFR has discussed, there also hadn't been a roller (that I've seen) that has a low inertia tip, like the stock rocker.
I had a set of 1.7 Crane gold rollers with an MS4 cam and patriot 660 springs and never had a single problem! I now have a set of 1.8 gold rollers on a smaller cam and the same springs and they have been flawless.
