CVO Technical > EVO
Easy way to check spring spacing for bigger cam
ltank:
S&S built me Custom V124 with 10.2:1 compression and a 585 cam. Bike runs fine but now I want more power. I want to install a 600 cam. S&S looked up VIN but can't tell me what the spring packing was set for.
Normally motor has a 640 cam but I don't know it they set it for the 585 cam that won't work for the 600 cam. Is there an easy way to check without removing the heads? If I remove the heads then I gotta remove the cylinders replace the base gaskets too and new piston rings. A big hassle but that's the safest thing I guess. Can I remove the forward rocker box, install the new cam and measure the spring oil seal to collar clearance? Or am I missing something. Any help is appreciated. Thanks
MCE:
Leave the piston in the cylinder. Just pull the pin out and leave the piston in the bore, if it comes to that.
(Saves you from disturbing the rings at least)
You'll probably have to pull a head and use the Trock fixture to test the spring compressed height and
clearance. It helps to know what springs (part #) were installed too. Then check those with a spring
tester at the installed/compressed heights.
Otherwise you'd be guessing. Feeling lucky? lol
johnsachs:
--- Quote from: ltank on December 13, 2018, 07:34:02 PM ---S&S built me Custom V124 with 10.2:1 compression and a 585 cam. Bike runs fine but now I want more power. I want to install a 600 cam. S&S looked up VIN but can't tell me what the spring packing was set for.
Normally motor has a 640 cam but I don't know it they set it for the 585 cam that won't work for the 600 cam. Is there an easy way to check without removing the heads? If I remove the heads then I gotta remove the cylinders replace the base gaskets too and new piston rings. A big hassle but that's the safest thing I guess. Can I remove the forward rocker box, install the new cam and measure the spring oil seal to collar clearance? Or am I missing something. Any help is appreciated. Thanks
--- End quote ---
Why would you need to replace the piston rings because you pulled the cylinders off if they aren't worn out of specs ? ???
There is a jig made that may allow you to remove the valve springs with the engine in the frame. Check 1 intake and 1 exhaust. S&S is fairly consistent on their installed heights(valve protrusion) from cylinder to cylinder. Usually 2.040" - 2.060", on both intake and exhaust, both cylinders.
John
MCE:
Protrusion on S&S' stuff is usually very consistent. (Usually within a few thousandths)
prodrag1320:
why would you have to even remove the cylinder? just try not to disturb it when removing the head.as far as springs go,the head should be removed as valve to valve & valve to piston should also be checked,not just coil bind
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