Tapping noise from valvetrain - problem solved!
This is a discussion on Tapping noise from valvetrain - problem solved! within the Internal Engine forums, part of the LSx Technical Help Section category; I shattered the ring and pinion as soon as I drove onto the highway after having my upgrades and stuff ...
02-25-2008, 09:23 AM #21
I shattered the ring and pinion as soon as I drove onto the highway after having my upgrades and stuff installed. I took off in first easy and then got on and slammed it in second and boom there went the 10 bolt. At the time I was excited but very ticked too...lol. So at the time I just had them rebuild it because I didn't have the $$$ for a 12 bolt or 9". I'd like to buy a set of fuel rail covers but that's not a top priority for me right now.
On the 13.2 run I had my stock tires on...I can't seem to think which brand they were at the time but right now I have the eagle f1 gs-d3's. I'm going to slide on the m/t's on for the track this weekend if I have enough miles on her by then.
I have a brand new set of bmr sfc's (black tubular) just sitting at my house. I would love to have the ws6 hood or a raptor hood myself.
I haven't thought about adding more oil to see if it would go away....hmm... I'll check into that.
02-25-2008, 11:04 AM #22
I run AFR heads on my chevelle, and AFR also did the custom camshaft through Comp Cams. After dyno time, installed the engine and all was well. Although there was more lifter noise than should have been on such a mild hydraulic roller,,,much like you described. Car ran fine and dynoed fine though. The cam sounded more like a solid roller.
Well,,,,,after being in the car for about a year and putting about 6,000 miles on it,,,a lobe was wiped off the camshaft and several others scored,,,with ruined rollers as well.
After calling around to AFR and Comp,,,I found that AFR installed "SOLID ROLLER" valve springs with WAY too much spring pressure,,,even after AFR had Comp custom grind a HYDRAULIC roller for the car and knowing what was going in, (it was even in the damn paperwork),,,they sent me a set of heads with the wrong spring setup.
Anyway,,,,it explained the lifter noise it had,,,,simply too much spring pressure was collapsing the lifters, the excessive pressure (630 lbs. over the nose, 310 lbs. at the seat) eventually wore down a couple of lobes since at the time,,,,Comp Cams hydraulic rollers were made from soft cast iron.
Anyway, after finding who to blame,,,,AFR did nothing to fix the problem and were absolutely no help at all. Comp Cams custom ground another hydraulic roller camshaft,,,(which by the way are now all billet steel cores) and sent the correct springs, (400 lbs. over the nose a 260 lbs. at the seat) as well as a new set of roller lifters. Did I mention that 10 of the AFR springs were broken as well???? The springs they setup the heads with were for a huge solid roller up to .750 lift with incredible pressures, those tend to not like extended rpm street use,,,, create tons of heat,,,, and generally break as a result. Funny though the car never skipped a beat.
Well $2,500 later, the engine is now very quiet with no lifter noise at all, and running strong.
I would be interested in seeing if those springs you had DaddySS are indeed the wrong spring pressures. Something to look into,,,as your situation sounds frightenly much like mine, and the camshaft company was not to blame at all in my case.
You didn't mention if your camshaft core was cast iron or billet steel. I am guessing softer cast iron.
I was glad to hear that Comp Cam switched to billet steel cores for all hydraulic rollers now, same core they already used for the solid rollers.
Last edited by Firebirdjones; 02-25-2008 at 11:09 AM.
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