Paid for about 3/4 of the last 2 race weekends, no thanks to lots of broken parts....rocker arm, starter solenoid, power-on safety LED's, and I know I'm missing something.
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- Thread starter Magnethead
- Start date
FenderBumper
The "good old days" ??
Nice night. I guess you won it all. That round 3 looks close, but it looks like the hole shot was the difference.
How does a rocker get split like that? Was the piston involved?
How does a rocker get split like that? Was the piston involved?
Rounds 2, 3 and 4 were entertaining. Carrel's Daughter's boyfriend is young's son, and we beat Carroll twice (1st round of super pro, 2nd round of quick) so we kinda ticked that family off in the first 2 rounds. We roll up with a 5.64 on the door so Brad (the younger Young) tells his dad to hold one to match us (he started as a 5.44). Low and behold, that was the difference in the race....along with those 4 teeny tiny numbers.
Round four.....lets just say the announcer thought the timing system had broke. Allen is usually .005 to .010, we're usually under a .025.
We'll know when we pull the heads in the offseason. Broke on the burnout friday night testing...otherwise would have broke first round of super pro. Can hear it in the video, RPM's zing higher than their already-highness. It was the #3 exhaust, lucky we didn't hydraulic the cylinder since the valve wasn't opening anymore.
Round four.....lets just say the announcer thought the timing system had broke. Allen is usually .005 to .010, we're usually under a .025.
We'll know when we pull the heads in the offseason. Broke on the burnout friday night testing...otherwise would have broke first round of super pro. Can hear it in the video, RPM's zing higher than their already-highness. It was the #3 exhaust, lucky we didn't hydraulic the cylinder since the valve wasn't opening anymore.
FenderBumper
The "good old days" ??
So Young tried to shave some time and lost the race? I guess he didn't expect that .0058 reac and thought he had room to play, becauses his sections and speed are faster. That's assuming I'm reading the slip right.
From the pic, the rod seat on that rocker looks distorted, as if it slipped out and jammed the valve into the piston, then got mashed when things came back. I guess if the valve stem is bent, you'll find out sooner or later.
From the pic, the rod seat on that rocker looks distorted, as if it slipped out and jammed the valve into the piston, then got mashed when things came back. I guess if the valve stem is bent, you'll find out sooner or later.
It's just the picture. Allen [Sturgeon] Broke his yesterday too. Couple of other guys keep a whole rack of spares, they've broke 3 in one race. And they're on baby motors. But more people run cheap parts...these harland sharps aint cheap.
We were running 63's all night long, but the tail wind started acting up and we dropped to a 65 (in time trials, we went 5.61 @ 121.8 mph with a strong tailwind). So we split the difference on a 64. Butch dialed up one on his son's advise because they thought we were holding one (we were) and we'd break out, so they wanted to keep things fair, and hope we broke out by more. Almost did.
F
FlFlash
Guest
We've seen some similar roller rocker arm failures, different brands ( I've personaly never seen a HS rocker broken like that ) the most most common cause was a geometry issue where the studs girdle was causeing a misalignment after being torqued down. The guys where checing the valve geometry BEFORE installing and torqueing the girdles down. After the girdles where installed the roller tips where no longer perfectly centered on the valve tips and as the lift increased the roller would go farther off center sideloading the rocker and either fracture the rocker body similar to your pics or seize the roller bearing. We wound up remachining several sets of girdles to a tighter tolerance and to Custom fit some of the aftermarket heads out there, Not sure if your running a stud girdle or not? Something to look at anyway.
Yes we do, We have to keep them way up on the adjusters to make everything clear. Never thought of clamping all the adjusters together re-aligning the studs enough to move the wheels around.
