The SVS II Deluxe Valve Refacer is
most accurate Valve Refacer made today..0005 accuracy for standard chuck and .0002 accuracy for high-performance chuck. The Industry's Best.
The Kwik-Way CenterLine Chuck is what makes
SVS II Valve Refacer a cut above all
rest. Other Valve Refacers use Chucks, referred to as "center less". These use rollers to grip
valve stem while
Kwik-way Chuck uses two sets of independent balls that grip
stem at two very distinct points. The advantage being, if you have a center less chuck and you're trying to grind an in-service valve, if there is any out-of-round on
valve stem, that out-of-round is transferred from
rollers on
center less chuck to
valve face. So your face run out will be no better than your stem run-out.
With
Kwik-way Chuck, since it uses two sets of balls that capture
valve in
wear area of
stem, will automatically re-centerline
valve. What that means is when we grind
valve,
face will come out true to
center line of
stem that actually rides in
valve guide.
In other words, if there is some wear on
stem surface
Kwik-Way Chuck is going to compensate for that wear in such a way that
resulting ground valve face is perfectly centered when
valve is back in
engine.
Some valve manufacturers design their valves with a tapered stem. Because of
unique way The Kwik-Way Chuck grabs
valve stem, taper has no influence on
precision of
positioning of
valve in
chuck. Other Valve Refacer Chucks may cause
valve to tilt in
chuck. Without a way to compensate for valve stem taper, you cannot reface
valve with
same amount of accuracy as with a Kwik-Way machine.
The Kwik-Way Chuck is air activated. You simply push a button that will release
two sets of balls and allow you to insert
valve. You will have a range of 4mm to 14.3mm with
standard or high perfermance valve chuck.
Another type if chuck used on other machines is a collet chuck. To give you
range of 4mm to 14.3mm you would need at least 5 or as many as 9 different collets to cover that range. As you now know, with
SVS II, there is no change over required for various stem diameters. And as you change collets there can be problems with repeatability because you can put
collet in
receiver with dirt or grit between
receiver and
collet. In that case, you will get inaccuracy. Also, if you have a tapered valve,
collet will not compress to
same tension at both points so again with a collet chuck and a tapered valve you get inaccuracy.
The same is true with an out-of-round valve. Because
collet wants to compress uniformly around
circumference of
stem. The bottom line is that
other chucks grab
valve stem using a greater amount of
valve surface, which can be a problem if there are any irregularities in that valve.