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General Category >> Rubber Side Down! >> WTB: Dear I say, I need new springs?
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Message started by QNero on 12/09/21 at 11:04:41

Title: WTB: Dear I say, I need new springs?
Post by QNero on 12/09/21 at 11:04:41

So, I just wanted to get your folks' opinion on my Valve Springs and what maybe I should replace them with. Maybe Lancer will pipe-up to sell me some racing springs or not? hint ;)

Inner Spring.

Title: Re: Dear I say, I need new springs?
Post by QNero on 12/09/21 at 11:07:46

So, I just wanted to get your folks' opinion on my Valve Springs and what maybe I should replace them with. Maybe Lancer will pipe-up to sell me some racing springs or not? hint Wink

Outer Spring:

Title: Re: WTB: Dear I say, I need new springs?
Post by TheSneeze on 12/09/21 at 21:10:49

They are within the service limit - why do you want to replace them? They get shorter as they wear out, not longer.

Title: Re: WTB: Dear I say, I need new springs?
Post by DragBikeMike on 12/10/21 at 09:21:11

In my experience, the stock springs hold up well if not overheated. Like Sneeze said, your springs are within the service limit so they are probably OK.

If you want more assurance, you can load test them. A new spring assembly (inner & outer together) exerts 55 lbs. of force at installed height of 1.3". The graph below gives you the load data for a new spring assembly.

Title: Re: WTB: Dear I say, I need new springs?
Post by DragBikeMike on 12/10/21 at 09:26:38

A bathroom scale works OK. Make sure to test them with the spring retainer since it sets the installed height for the inner spring. The installed height for the inner spring is a bit shorter than the outer spring. The retainer sets that up for you. A drill press works good for compressing the spring assembly. I wouldn't settle for anything less that 50 lbs @ 1.30" (10% reduction).

Title: Re: WTB: Dear I say, I need new springs?
Post by DragBikeMike on 12/10/21 at 09:31:08

One of these Proform tools is a nice addition to your tool chest. They are cheap and make the job a lot easier. A lot of folks use these along with a bench vice to test springs. Again, you are looking for 55 lbs. @ 1.30". If you want to be sure, you can check them at the full open height too. The graph I provided will tell you what they should be at the full open height for your camshaft.

Title: Re: WTB: Dear I say, I need new springs?
Post by Fast 650 on 12/10/21 at 09:31:58

Stay with the stock valve springs unless you like replacing the cam and rockers on a regular basis. The stiff race type springs aren't needed and the increased pressure will wear the lobes and rocker pads at a greatly accelerated rate.