Results 21 to 36 of 36
This is a discussion on Cam Question within the Internal Engine forums, part of the LSx Technical Help Section category; thx Orion...
01-27-2011, 11:38 AM #21
- Join Date
- Feb 2009
- Ugy Lower Corner of AL
Navy Blue Metallic
- 98 T/A w/a little mods...
01-27-2011, 12:26 PM #22
01-27-2011, 12:41 PM #23
01-27-2011, 01:43 PM #24
I think I paid 60 bucks for my LS2 chain and timing gears. If the gears looks good, you can get away with just the chain. You'll have to get a puller to get the crank gear off if you decide to change it.
01-27-2011, 02:35 PM #25
The 918 beehives are a good spring, with 125 lbs. of seat pressure and good to .600 lift. I'd use em if I had a choice.
My wifes car however has a Crane version of the LS6 cam which isn't crazy with lift (.551) but for some reason it came with a double spring setup with titanium retainers. Overkill for that cam but it works.
01-27-2011, 02:58 PM #26
- Join Date
- Mar 2009
- pompano beach florida
- 2002 Camaro Z/28 Pewter
jones have you looked into 918's lately? A couple years back they were sending out some bad batches that were breaking on a lot of cars. Supposedly they fixed the issue but i have to say everytime on on forums and see broken springs a lot of times they are still 918's even new ones in fact there were just 2 threads about them on tech each with under 15k on them. To the op id looks into some duals as said but that might be overkill for you look into some pac 1218's or 1518's.
01-27-2011, 03:06 PM #27
Haven't looked into the beehive 918's lately. I wouldn't be afraid to run them though if I were building something that could use them. Usually my stuff requires more seat pressure.
I've had my fair share of broken springs (not 918's). Sometimes that stuff happens. I'd be worried more about proper installed height, seat pressure, open pressure, coil bind, and retainer to valve seal/guide clearance.
If all that is good, then it's just up to the spring to do it's job at that point. Most of the time harmonics or coil bind breaks the springs.
Alot of other good springs on the market too though.
01-27-2011, 03:09 PM #28
I've read, and followed the COMP 918 spring problems for awhile. It did seem like they corrected it, but isolated cases of breaking have come up. I run 918's on a .586 (Maybe a tad more, been awhile) cam, and I guess if I were to replace them I would run the PAC 1518, or the double. That's said, I think if set up properly, most of the spring failures would have been avoided.
01-27-2011, 03:19 PM #29
Ran the engine on the dyno,,,,installed in the car, drove about 3,000 miles tops.
Broke 9 out of 18 of those springs. I still have them here in the box. AFR set the heads up, I ran them out of the box. Evidently, they were a bad batch or AFR did a piss poor job installing them.
I called comp,,,,got a set of their dual 1.625" springs, I installed them to their specified install height. Engine has been fine ever since,,,5 years and probably 25,000 miles.
I've still got the box full of those broken pieces of junk,,,lol.
01-27-2011, 03:23 PM #30
Never heard of half (9) breaking. That definitely sounds like a quality control problem.
01-27-2011, 03:27 PM #31
Ya Comp is huge, they probably grind 90% of everything that is floating around out there. I've always liked comp and their customer service, custom cam grinding etc....has always been super.
I'll snap a pic of those springs just for giggles, I have them packed in a box,,,give me a little time to find them.
01-27-2011, 03:31 PM #32
01-27-2011, 04:16 PM #33
01-27-2011, 06:20 PM #34
Here you guys go,,,something to ponder. Sorry it took so long, they've been packed in a box for a few years. Evidently at some point between Ohio and moving here the box got wet, so don't mind the surface rust.
Hi-Po,,,,I was wrong on the count,,,,it was 7 broken and not 9,,,,but still........the top row are the good ones left. The rest are broken.
These are PAC double springs with a damper with electroplate polishing. If you look closely you can see those broken 7 springs were all inside secondary springs.
This also pounded the hell out of the PC valve seals (lucky no valve guide damage). Not only that but it took out 2 roller lifters and both associated cam lobes. Evidently when the inners broke it bound up the spring, and when the lobe came around and the rocker tried to push the spring down it wouldn't compress,,,which in turn ruined those lifters and wiped the lobes off the cam.
This was an expensive $1,500+ repair that required another custom ground cam, all new lifters, and completely tearing the engine down to remove debri.
01-27-2011, 06:33 PM #35
First I've heard anything bad about AFR, I would bet the employee no longer works for them. AFR and Tony Mamo run a real smooth operation from what I've experienced. Sorry to see that carnage, I'm sure it was devastating.
01-27-2011, 06:43 PM #36
What tipped me of was a strange squeak in the motor, which turned out to be one of the roller lifters. So I started tearing it down and that's what I found. I still have the old cam too with 2 lobes completely gone and the lifters here that were all chewed to hell.
Ya it was a screw up at AFR. They worked in conjunction with Comp to custom grind the cam for this combo according to their head flow numbers etc....Then they sent me the heads with these springs, which had too much seat pressure to begin with (I later found that out from Comp after the disaster). Talking with AFR and letting them know it was a $1,500 repair,,,they were pretty much silent about the whole thing, wouldn't offer any assistance, not even an appology. I still have the guys name I delt with here somewhere. They just left me hanging with the whole mess.
I'm not saying I wouldn't use AFR again, they make a killer head. I just don't trust their assembly procedures, and any head from them here on out will get torn down and inspected thoroughly from now on.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By Kidreynolds in forum Texas MembersReplies: 5Last Post: 12-21-2009, 12:34 PM
By casperss in forum Internal EngineReplies: 19Last Post: 12-05-2009, 04:19 AM
By PFM in forum Internal EngineReplies: 3Last Post: 09-23-2009, 06:08 AM
Question: TSP cam package question...By Stormzracing in forum Internal EngineReplies: 17Last Post: 05-20-2009, 10:55 AM
By XtinKt in forum Internal EngineReplies: 0Last Post: 02-04-2006, 06:40 AM