GT11 + Dual Valvespring Noise?
04-02-2008, 09:55 PM
#1
8 Second Club
Thread Starter
iTrader: (7)
Join Date: Dec 2002
Location: Maryland
Posts: 1,086
Likes: 0
Received 0 Likes
on
0 Posts
GT11 + Dual Valvespring Noise? I recently installed a GT11 camshaft and a set of patriot dual valvesprings on an engine that I built (stock cube turbo LS2). At idle and especially above 1600 RPMs there is a significant amount of valvetrain noise, much more than the stock sewing machine sound (just a lot louder version of the stock sewing machine sound). I am using stock heads and stock pushrods. I am using GM lifters P/N 17122490. I am highly doubting a piston to valve issue (the new pistons have valve reliefs cut into them).
Is this normal or is should I be checking my lifters for proper operation?
Is this normal or is should I be checking my lifters for proper operation?
Last edited by FastBlackTA; 04-02-2008 at 10:23 PM.
04-03-2008, 08:23 AM
#3
8 Second Club
Thread Starter
iTrader: (7)
Join Date: Dec 2002
Location: Maryland
Posts: 1,086
Likes: 0
Received 0 Likes
on
0 Posts
Second thought: The rear oil dumbell-looking seal was installed, but could it be damaged? The engine has great oil pressure (+40 psi), but if it is damaged will it divert oil from the valvetrain area?
04-03-2008, 12:13 PM
#7
Stock pushrods (7.38") are too short for that cam and they're way too flimsy to hold the pressure of dual springs. Not surprised you're getting some racket. Try chrome moly 7.425" pushrods.
__________________
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
Trending Topics
04-18-2008, 04:18 PM
#10
8 Second Club
Thread Starter
iTrader: (7)
Join Date: Dec 2002
Location: Maryland
Posts: 1,086
Likes: 0
Received 0 Likes
on
0 Posts
Update: valvetrain noise was reduced a LOT by the 7.425 pushrods.
However, I noticed a ticking noise from one of the valves last night that got worse and worse, but only at idle. Once in gear and moving, no noise at all.
It isn't an oil pressure "issue," but my theory is that the high oil temps of my tubocharged motor (oil temps can get as hot as 240 degrees) thinned my 5W-30 oil and couldn't keep my lifters pumped up like they were supposed to be. I changed to a 10-40 oil today and it helped the valvetrain noise a LOT...now it is very minimal. Oil pressure increased about 5 psi or more at least.
I just hope that no damage was done to the lifters when I was hearing the loud tapping noise from the drivers side of the engine. Any thoughts?
However, I noticed a ticking noise from one of the valves last night that got worse and worse, but only at idle. Once in gear and moving, no noise at all.
It isn't an oil pressure "issue," but my theory is that the high oil temps of my tubocharged motor (oil temps can get as hot as 240 degrees) thinned my 5W-30 oil and couldn't keep my lifters pumped up like they were supposed to be. I changed to a 10-40 oil today and it helped the valvetrain noise a LOT...now it is very minimal. Oil pressure increased about 5 psi or more at least.
I just hope that no damage was done to the lifters when I was hearing the loud tapping noise from the drivers side of the engine. Any thoughts?
Last edited by FastBlackTA; 04-18-2008 at 04:26 PM.
05-01-2008, 03:43 AM
#15
TECH Apprentice
Join Date: Jan 2008
Location: Gladstone, Queensland, Australia
Posts: 366
Likes: 0
Received 0 Likes
on
0 Posts
Mine is noisy on the drivers side too. The lifters may lack oil pressure on that side. Typical of LS series engines, 5W30 oil worsened the problem 10 fold, 15 40 going in tonight
