Do new valves need grinding?
Do new valves need grinding?
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Join Date: Apr 2005
Location: Co. Carlow, Ireland
Posts: 455
Do new valves need grinding?
This might sound a bit of a dumb question, but do brand spanking new valves need cutting/grinding?
I was planning on reusing my exhaust valves and I sent them off to the machine shop for bead blasting and regrinding, but unfortunately they've been lost in the post by our splendidly incompetent Royal Mail (which is unfortunately what we have to use here in the UK). Now I'm wondering if I was to order brand new ones would I need to get these ground too? I don't know if new ones come precision cut ready for use, or if they come slightly oversize for grinding down or something?
Thanks for your help, and sorry if this sounds a bit of a naive question!
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Charles
'84 911 3.2
The Home of Kwik-Way Valve Refacer Brands
Exclusive Six-ball Chuck Design
Every Kwik-Way valve refacer chuck features two sets of 3 balls each that grip the valve stem on that part which travels in the valve guide. This patented design ensures perfect concentricity between the stem and the valve head and provides precision and reliability.
The compound compensating, self-centering, six-ball chuck automatically aligns the valve, refacing it concentric with the original centerline of the valve system. This type of 2-point stem support is referred to as a “Centerless” grinding system.
The valve is kept firmly in place by pneumatic action, controlled either by a lock/release button or a convenient pedal. Pneumatic operated change-over also eliminates the need to switch off the motors when changing valves, reducing machining time and increasing life of motors.
The 6-ball chuck supports variable valve rotation speed, which allows the operator to adjust surface speed and ensure the best surface finish for a wide range of valve head diameters. The standard chuck supports valve stems between ø 4 and 14mm, and an optional chuck is available for larger diameters ranging from ø 11 to 21mm. Other valve grinding machines can require up to 9 separate collets to achieve the same range.
The chuck itself is mounted on the head, which can then be inclined up to 62°.
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