Another 918 down the drain.
I said it before on pt.net and I'll say it here. It looks to me that the spring is not only broken but the bottom looks bent. Looks as though the spring was done in by coil bind. Does anyone else see what I'm seeing here or am I looking at it different than everyone else?
I would wait for install specifics before blaming the springs too although I know Comp has had issues in the past with the 918's. I ran these with a .603"/.600" lift cam for 12K miles with zero problems. The 918's were originally rated to .625" lift before they came out with their duals then they reduced its "rating" to .600" to get people to buy the duals.
I said it before on pt.net and I'll say it here. It looks to me that the spring is not only broken but the bottom looks bent. Looks as though the spring was done in by coil bind. Does anyone else see what I'm seeing here or am I looking at it different than everyone else?
Also...He said they were the new 918s. I thought the new design was rated for .625 or .650 (can't remember which) and the old design was rated for .600. Either way, it a bad day.
So on this engine, was preload checked? Pushrod length checked? I'd bet $100 somebody threw a 7.4 pushrod in that motor, TQ'd it to 22ft lbs and went about their merry way.
I'll bet you $500
I know from reading the post in the other forum where this occured that the end user didn't know the installed height of the spring. Just threw them in. I think that's what happened here and coil bind was achieved. That doesn't look like the old broken 918 problem where they'd break on the top coil. It looks all jammed up in the bottom like the coils bount up and the rockers smashed it to ****. LS1 Tech Stories
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I have no idea why anyone uses those single beehive comp crap springs. I understand the science behind them and all the hooplah but the proof is in the pudding and I see all sorts of breakage complaints with these. I've never seen ONE single complaint of breakage on Patriot Golds yet and they cost less.... Why everyone doesn't run them boggles my mind
You were running a .64X" lift cam. Those take special spring and pushrod prep. Ideally, you should run shorter pushrods on the exhaust lobes and you need to make certain that your springs over your intake valves have enough installed height to keep you out of coil bind (see installation error).
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
You were running a .64X" lift cam. Those take special spring and pushrod prep. Ideally, you should run shorter pushrods on the exhaust lobes and you need to make certain that your springs over your intake valves have enough installed height to keep you out of coil bind (see installation error).
Stock Z06 cam
springs I'll bet you $500 I know from reading the post in the other forum where this occured that the end user didn't know the installed height of the spring. Just threw them in. I think that's what happened here and coil bind was achieved. That doesn't look like the old broken 918 problem where they'd break on the top coil. It looks all jammed up in the bottom like the coils bount up and the rockers smashed it to ****.
I know from reading the post in the other forum where this occured that the end user didn't know the installed height of the spring. Just threw them in. I think that's what happened here and coil bind was achieved. That doesn't look like the old broken 918 problem where they'd break on the top coil. It looks all jammed up in the bottom like the coils bount up and the rockers smashed it to ****.