valve spring questions
Thread Starter
Instructor
Joined: Jan 2011
Posts: 124
Likes: 1
From: Waukesha WI
valve spring questions
I have a 2000 frc. I am getting my winter mod parts collected. Currently I have a vararam and SLP Powerflo exhaust installed. I have LTs and orx, ls6 intake, and 243 heads that will receive mild massaging. I plan on using an ls2 timing set and a ported ls6 oil pump and probably an underdrive crank pulley.
The cam I have chosen is an EPS 222/226 113 lsa with lift in the high .590's.
My question is will comp cans 918 valve springs be sufficient or are double wound springs be necessary?
I don't tend to rev super high and this vehicle will be used for street use. I doubt it will ever see a track but I tend to drive "spirited" very occasionally.
Also should the cam be a 1 or 3 bolt configuration?
I will appreciate any advice.
Thanks!
The cam I have chosen is an EPS 222/226 113 lsa with lift in the high .590's.
My question is will comp cans 918 valve springs be sufficient or are double wound springs be necessary?
I don't tend to rev super high and this vehicle will be used for street use. I doubt it will ever see a track but I tend to drive "spirited" very occasionally.
Also should the cam be a 1 or 3 bolt configuration?
I will appreciate any advice.
Thanks!
Racer
Joined: Aug 2005
Posts: 465
Likes: 16
Lots of people run the single beehive springs w/o issue. I prefer the redundancy of the dual springs and that's what I install on my engines. Break a spring with the duals and you can survive. Break a single spring and you're probably screwed.
Le Mans Master
Joined: Nov 2009
Posts: 6,119
Likes: 156
From: Huntington tx
Beehive single spring. Your not having a lift greater than .600 and your not sustaining long durations at high RPM's. Why beat your cam lobes to death by the increased ramp pressure.
Heres a excerpt from an article,
Heres a excerpt from an article,
According to tests completed by COMP, the company’s unique Beehive springs offer a huge number of benefits over stock-style cylindrical springs, including reduced valve spring mass, faster valve acceleration, increased valve train rigidity, and reduced valve train component stress among other benefits.
The word has gotten out in the performance world and folks all over the country are using them for a wide variety of applications from street performance to extreme racing endeavors, boat racing to Baja.
The word has gotten out in the performance world and folks all over the country are using them for a wide variety of applications from street performance to extreme racing endeavors, boat racing to Baja.
Drifting
Joined: Sep 2007
Posts: 1,649
Likes: 50
From: Goldsboro NC
i think you missed some of the guys above points. His cam does have pretty high lift and even tho 918's are rated to .600 i personally would and DO have the added security of double springs. Besides if his cam has XER lobes those deliver their own punishment anyways. To the OP i went with a VERY good dual spring. PRC's EHT double spring rated to .675
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Thread Starter
Instructor
Joined: Jan 2011
Posts: 124
Likes: 1
From: Waukesha WI
Ok what is a good beehive spring to look at? Just want to consider all angles.
Drifting
Joined: Sep 2007
Posts: 1,649
Likes: 50
From: Goldsboro NC
If you decide to go the beehive route then the comp cams 918's are good springs. The PAC 1518 springs are really good as well. They have a higher lift tolerance rated to .650 but retain the single beehive spring.
Le Mans Master
Joined: Nov 2009
Posts: 6,119
Likes: 156
From: Huntington tx
My heads are stock LS1 using stock valves. My engine is very strong and the valvetrain is light and very smooth i.e. no clack clackity racket. Hence very SMOOTH sound coming from the heads but one hell of a racket coming out the pipes.
Now if you are going for more lift take the PAC 1513's.
Otherwise, more isn't always "better".
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
My cam is a TSP 228R .588 lift LSA 112, using PAC 1213 beehive springs.
My heads are stock LS1 using stock valves. My engine is very strong and the valvetrain is light and very smooth i.e. no clack clackity racket. Hence very SMOOTH sound coming from the heads but one hell of a racket coming out the pipes.
Now if you are going for more lift take the PAC 1513's.
Otherwise, more isn't always "better".
My heads are stock LS1 using stock valves. My engine is very strong and the valvetrain is light and very smooth i.e. no clack clackity racket. Hence very SMOOTH sound coming from the heads but one hell of a racket coming out the pipes.
Now if you are going for more lift take the PAC 1513's.
Otherwise, more isn't always "better".
you are going to destroy your motor.
Le Mans Master
Joined: Nov 2009
Posts: 6,119
Likes: 156
From: Huntington tx
PAC Single Beehive Valve Springs Rated to .600" Lift
The PAC single valve springs will use your factory seats, seals, retainers, and locks! We recommend stepping up to a dual valve spring kit if you plan to run more than .600" lift and/or a valve larger than 2.08" diameter.
The PAC single valve springs will use your factory seats, seals, retainers, and locks! We recommend stepping up to a dual valve spring kit if you plan to run more than .600" lift and/or a valve larger than 2.08" diameter.
Instructor
Joined: Dec 2007
Posts: 115
Likes: 0
Comps new 918s are good to .625" lift. I run them on my .621" cam and had to shim them to get the correct distance to coilbind.
You dont want to run a dual on such a low lift cam, your springs will be a long way from coild bind, which is less than optimal.
Plus the increased load from the dual springs will actually take away lift, and the weight will make them more likely to be out of control. You need to run a beehive in this situation.
You dont want to run a dual on such a low lift cam, your springs will be a long way from coild bind, which is less than optimal.
Plus the increased load from the dual springs will actually take away lift, and the weight will make them more likely to be out of control. You need to run a beehive in this situation.
