This is a discussion on broken rocker within the Internal Engine forums, part of the LSx Technical Help Section category; I was driving home from work one day with the cruise set @ 80mph when i heard a loud lifter ...
10-11-2007, 08:32 AM #1
I was driving home from work one day with the cruise set @ 80mph when i heard a loud lifter type ticking coming from me engine and the check engine light was flashing. I drove home 3 miles and tore off the valve cover. What i found was that the roller bearings from my rocker arm on cyl. 5 exhaust had come out of the arm assembly and i had a broken valve spring also. I have comp. dual springs so the valve was still up so i installed a good rocker arm and did a compression test. Much to my demise i have no compression in that cylinder. I have a mti x1 cam, hardened comp pushrods, and the comp springs along with titanium keepers. My question is what went wrong? I wasn't running the engine hard, and have had the cam/springs installed for at least 20,000 miles. Also what is the chances that i have damaged the piston? I know it is probably 50/50. I had went to the strip the weekend before, but i had driven at least 500 miles after that without any problem. Thanks
10-11-2007, 02:37 PM #2
10-11-2007, 05:50 PM #3
I'm pretty sure that i have a bent valve. My question is the possibility of the valve putting a hole in the piston when it made contact. I wasn't running it hard like i said, maybe like 1700 rpm or so. Thanks for the input though.
10-12-2007, 04:53 PM #4
- Join Date
- Oct 2005
- 2002 Vette
Stock rockers? Unfortunately, the stock rockers were designed with lower spring pressures and lower lift cams. I have been an advocate of aftermarket rockers for a long time and have taken crap for it, but the fact of the matter is GM designed the valve train for lower spring loads and as you build it up you put a lot more stress on it. The wipe pattern of the rockers is very wide as well and I think guys are going be having guide issues in the future as well. Either go with a set of correctly setup aftermarkets or get yours rebuilt by Harland.
10-15-2007, 05:27 AM #5
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