New LS2 build....2 broken rocker tips
New LS2 build....2 broken rocker tips Motor is a stock rebuild with EPS 226/230 and TEA stg 2 243s w/.45 HG. Started out with 7.4 cheap PR (thought they were stronger) which it destroyed almost all of them and broke the tip of an inner spring after test driving it. Checked PR length and came up with 7.350 and put some BTR PRs in and went ahead and changed all the springs since wasn't sure of dual springs that came with heads (bought used) with some BTR .650 springs. After about 100 miles on the street it broke 2 intake rocker tips (stock w/trunion upgrade) while idling.
Question is, could this have been from previous event with too long pushrod weakening them or am I looking at bigger issues?
Additional notes: morel 5315s, PTV was checked by builder and was good, heads are milled .020, preload is about .50 (1/2 to 3/4 turn)
Thanks for any help
Question is, could this have been from previous event with too long pushrod weakening them or am I looking at bigger issues?
Additional notes: morel 5315s, PTV was checked by builder and was good, heads are milled .020, preload is about .50 (1/2 to 3/4 turn)
Thanks for any help
The previous springs Ti retainers were reused and probably even the seats. Went back with BTR 650 springs instead of what came on the head from TEA. This was after the PR incident. Could this have caused binding? Its awfully concerning that I destroyed some PRs and now Im breaking stock rockers which seems to never happen.
New LS2 build....2 broken rocker tips What's the lift on the intake side?
Maybe the longer PR's you had, which destroyed your lifters, contributed to weakening the rocker arms?
That's really all I can come up with.
Maybe the longer PR's you had, which destroyed your lifters, contributed to weakening the rocker arms?
That's really all I can come up with.
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Verdad Gallardo New LS2 build....2 broken rocker tips
Originally Posted by turboost
Lift is .598 on the intake. And as far as I know there is no lifter damage. Do you know something I don't....
Point is still valid though. If the PR's were trashed with the 7.4's, and after measuring and coming up with a 7.350, it's highly likely the PR's beat the absolute **** out of the lifters, hence them (the PR's) being the part that gave up the ghost.
And still, all I can come up with is the longer PR's contributed to weakening, possibly cracking a few of the rocker tips. This doesn't happen very often at all. I'm just thinking out loud here...
I replaced the springs after the PR incident due to breaking one of them.
Going to be removing the heads soon and assessing the damage. I'll pull the lifters as well and check them. The builder clayed the piston and said the valves never touched them so that's what I meant by PTV was good. If it is a PTV issue, why would it break at idle as opposed to 4k rpm? A lot of questions that I hope to find a smoking gun during disassembly but would like to have a good hunch before. Really appreciate the ideas so far.
Going to be removing the heads soon and assessing the damage. I'll pull the lifters as well and check them. The builder clayed the piston and said the valves never touched them so that's what I meant by PTV was good. If it is a PTV issue, why would it break at idle as opposed to 4k rpm? A lot of questions that I hope to find a smoking gun during disassembly but would like to have a good hunch before. Really appreciate the ideas so far.
That's strange.
I would start all over from the beginning with the top end.
Also,
check out Manton or Trend for PR's. I got a nice set of Manton's 11/32' sized to my exact specifications. 7.363". and 4 at 7.353".
They'll cut them to whatever length you need, and how every many you need at different lengths, too.
I would start all over from the beginning with the top end.
Also,
check out Manton or Trend for PR's. I got a nice set of Manton's 11/32' sized to my exact specifications. 7.363". and 4 at 7.353".
They'll cut them to whatever length you need, and how every many you need at different lengths, too.