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I was just lightly cruising when the outer spring broke on #4 intake valve. The springs are from a MS4 cam kit from Texas Speed with about 20k miles of daily driving on them with 1 hard track day.
Car runs and has power to do 60+MPH but runs a bit funny and shakes a bit. Since the inner spring is still intact, there is no metal in the oil, and the car doesn't run too bad really - I think my valve is OK. I really don't want to pull the head to check but what do you guys think, just do a compression test and if that is OK consider it fine and install a new spring?
you know you don't have to pull the head to change it ???? when you change it on the car (engine) you fill the cylinder with air that alone will tell you much !!!
you know you don't have to pull the head to change it ???? when you change it on the car (engine) you fill the cylinder with air that alone will tell you much !!!
Yes, I am going to get that spark plug air compressor adaptor thingy tool
Sucks...but with a cam like that, 20k miles is about as far as I'd take it before I put fresh springs in anyway. MS4's, especially the older ones, are pretty damn brutal on the valvetrain.
It'll take you a couple hours the first time but fill the cylinder with air and get a Comp valve spring compressor to make it a pretty easy job.
Sucks...but with a cam like that, 20k miles is about as far as I'd take it before I put fresh springs in anyway. MS4's, especially the older ones, are pretty damn brutal on the valvetrain.
It'll take you a couple hours the first time but fill the cylinder with air and get a Comp valve spring compressor to make it a pretty easy job.
When you say older MS4's do you mean the MS1-3? I thought the Texas Speed "MagicStick" was the cam and MS4 just means version 4 (which is the latest version).
I think I saw Texas Speed post before about how 20k miles on their MS4 was time for new springs if you do most of those hitting high RPMs often like in track conditions. Where if you spend most of it at cruising speeds you could go 40k or even 60k miles. I should call and confirm them later with one of their techs.
The issue is with the springs themselves. Texas Speed had issues with multiple batches of the PRC valve springs. In fact they no longer offer them. Call them up, tell them what happened and send them pics and theyll send you a new set of their new PAC springs for either free or a discount.
Fixed the one and everything is good again.
Almost time to put the car away for the winter so will plan to replace the entire set in the spring, hopefully Texas Speed will give me a discount on a new set of PAC springs.
Broke a valve spring
