Valve Spring Questions...
Thread Starter
Burning Brakes
Joined: Jun 2005
Posts: 860
Likes: 0
From: Jacksonville Florida
Valve Spring Questions...
In going with an aftermarket cam, I have seen certain ramp rates and amounts of lift require dual valve springs. I personally have no issue with them but have heard many different things regarding maintenance, long-term issues, etc....
What's the truth behind them? More difficult to install? Any quirks related to using duals like excessive warm-up time required for engine or replacement/maintenance of springs frequently?
What's the truth behind them? More difficult to install? Any quirks related to using duals like excessive warm-up time required for engine or replacement/maintenance of springs frequently?
Thread Starter
Burning Brakes
Joined: Jun 2005
Posts: 860
Likes: 0
From: Jacksonville Florida
Looking at both the Thunder Racing "Old Man Cam" or the "Cheater" both of which have at least one side with .600 lift. Everyone says this is beyond the capacity of the Comp 918's and would require going to duals like the 921's....
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Most performance springs will require more care and checking than the stock setup. However, I have seen guys with stock springs get some miles on them and if put on a dyno will also show the stock springs are no longer keeping up and require replacement. I wouldn't say duals are more difficult to install, but you will need a new set of seals because you have to remove the seals to get the new seat into position. There is one beehive that should keep up with that cam, the PAC 1518 is designed for long life and has higher lift capability. If you go to PAC's web site you will find the cost very high, but they can be had from vendors for less money. As far as warm up time, I think its just good practice to make sure the oil temp is up before romping on it anyway, even stock so if you follow that philosophy then there is really no special precautions. I always wait until my oil is up to 180 degrees before going much over 2,000 RPM. That way I know the whole motor is being properly lubricated and the oil is flowing back to the pan relatively quickly. I do this on all my cars.
Racer
Joined: Jan 2006
Posts: 415
Likes: 1
From: Ft. Wayne In
I have over 14000mi on golds with cam in my sig.No issues.You should heat cycle new dual springs a time or two before going to high rpm's on them.
Burning Brakes
Joined: Apr 2003
Posts: 908
Likes: 4
From: TROY MI
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Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I takes about 7-8 miles this time of year. With all the LEO's hiding, can't really get on it anyhow around here. Car will go away soon for the winter though. Once the ground starts to freeze, I can't open my garage door any more until the spring thaw. 
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