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Title: Valve spring change time ? Post by: Elnef on September 25, 2014, 08:15:29 am When is it time to change valve spring ?
How much lost pressure is okay ? Lets say 190 build in and 500 with full lift Is it time at 180 or 160 or ? Title: Re: Valve spring change time ? Post by: dangerous on September 29, 2014, 05:31:36 am There is no easy answer to this,
but a simple rule of thumb might be, if you can't restore the pressure with one .015" shim, then time to change them. If they have lost more pressure than this after one season, you may need a better spring, or have an issue with the application. Title: Re: Valve spring change time ? Post by: Erlend / bug66 on September 29, 2014, 07:24:14 am I would think that you change when you get valve float at a rpm you did not get it before?
I've run VW650 springs the last few years, and just replaced them each winter to be safe. Title: Re: Valve spring change time ? Post by: richie on September 29, 2014, 14:44:50 pm K 800s? if so their is a PSI spring that fits and seems to last much longer, more money but you know how that goes ::) >:(
cheers Richie Title: Re: Valve spring change time ? Post by: Elnef on September 29, 2014, 14:52:31 pm wasco jet from pauter ;)
I have been looking at k motion homepage and there is a lot there will fit my set up I belive its a good spring ? Title: Re: Valve spring change time ? Post by: LGK on September 29, 2014, 15:59:25 pm John,
Just a question;are you running titanuim valves,and if yes what sizes? Also i've noticed you are running JPM camshaft,other then if you're running a roller cam design from JPM,what did Johannes advice you to set up the springpackage on the heads? Steve Title: Re: Valve spring change time ? Post by: Elnef on September 29, 2014, 16:56:50 pm Hi Steve
I run normal cam solid lifter Yes ti valves intake 52,82mm 84g exhaust 41,3mm 70g Jpm lifter 94g Berg push rod 80g Jpm advised 190/200 build in and 500 at max lift Let me know what you are thinking John Title: Re: Valve spring change time ? Post by: neil68 on September 30, 2014, 03:40:37 am I would think that you change when you get valve float at a rpm you did not get it before? I've run VW650 springs the last few years, and just replaced them each winter to be safe. I started to experience valve float with my MS230 heads, after 160+ trips down the 1/4-mile drag strip. I replaced them with VW650 springs (available locally) and have just over 100 races on those springs, so I'll see how that goes. I must invest in a spring pressure tool one of these days. |