PEOPLE WHO KNOW valve springs
08-01-2005, 09:26 PM
#1
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PEOPLE WHO KNOW valve springs ok car has a X1 cam had it for 40,000 miles car studders like hell sometimes but then you can run it hard and "seams" to do better up top EVERYONE told me change the springs they are week and to used so I am BUT!!!!!!!!!!!! I checked one of the old ones and a new one and they test the same as fare as strength ??????? any help
08-01-2005, 09:29 PM
#3
Doesn't sound like springs. Shuddering sounds more like a tuning issue. Maybe your O2 sensors are going bad. But if you have 40k miles on your Manley springs, consider yourself fortunate to not have broken one yet. The X-1 is a hot little cam and has some very fast ramps. Congrats on the long spring life.
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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.
08-01-2005, 10:31 PM
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There is nothing wrong with your springs.. It will have power loss at higher rpms if it is the valve springs.. not down low.. That sounds like a "possible" fuel problem to me..it could be loading up with fuel a lil bit and clearing up when you get on it hard.
08-01-2005, 10:36 PM
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well thats what i thought too but EVERY LS1 (MTI,THUNDER RACING,TEXAS SPEEDjust to name a few )Shop told me springs
they explaned as so
the spring are not strong so they cant keep up with the lobs on the big cam at idle or lower rpms but once at certain rpms stuff is moving faster and easyer for the valves to ackt like they are working correct (sealing and **** i guess) and it runs better that is was with them now working alt lowwer rpm's but the car still does not have all that it should
personally never mad too much sence to me but they are the SPECIAL ist
they explaned as so
the spring are not strong so they cant keep up with the lobs on the big cam at idle or lower rpms but once at certain rpms stuff is moving faster and easyer for the valves to ackt like they are working correct (sealing and **** i guess) and it runs better that is was with them now working alt lowwer rpm's but the car still does not have all that it should
personally never mad too much sence to me but they are the SPECIAL ist
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08-01-2005, 11:13 PM
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Well, I really don't think its the springs. From what I've always seen personally, the power loss will be in the higher rpms with worn out springs. My stock springs are shot at the moment and on the dyno you could see where the springs started fluttering the valves and the power was jumping up and down irradically..
08-02-2005, 03:24 AM
#9
A GOOD performance valve spring will lose very little pressure after it's run....some lose none but that is not the norm. However, performance cams are harder on valve springs than stockers and my guess is your springs will continue to show good pressure until one or more of them are in two pieces. At 40K, count your blessings and replace them with EXACTLY what came out. Obviously those springs are a very good match for the intensity of the cam lobes you are running.
A broken spring can wreak slight havoc or total disaster depending on the RPM's when failure occurs....NOT worth the risk. If you installed a performance aftermarket cam and thought you should NEVER have to change them, your going to learn the hard way. At 40K you should put a used one on your trophy mantle and wink at it occassionally when passing thru....
A broken spring can wreak slight havoc or total disaster depending on the RPM's when failure occurs....NOT worth the risk. If you installed a performance aftermarket cam and thought you should NEVER have to change them, your going to learn the hard way. At 40K you should put a used one on your trophy mantle and wink at it occassionally when passing thru....
08-03-2005, 08:42 PM
#12
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i did not think it either but everyone said to try it and everyone told me 40k was alot on springs so change them anyway because of milage
if a coil wouldn't it be all the time or could it come in and out like it is doing.
can I buy one coil and swap it all around,, one each cylinder untile i hopefully find the bad one or are they spicific to sides or cylinder #
if a coil wouldn't it be all the time or could it come in and out like it is doing.
can I buy one coil and swap it all around,, one each cylinder untile i hopefully find the bad one or are they spicific to sides or cylinder #
