Cam Regrinds

Description

We re grind your stock or OEM Factory cam specific measurements and certified Regrinds. We make a 3d pint of. The cam you send us and with that 3d imige me find the best optimal preforence tp give you a more efficient cam lobe for best duration and lift via best performance Shipped with USPS First Class.The perfectly round section of the cam lobe. when the roller of the rocker arms is riding on this part of the cam the valve is fully shut.
FLANKS
the steep sides of the lobe, this is the part of the cam lobe which starts pushing the valves open on one side of the lobe and helps steadily and safely close the valve on the opposite side of the lobe
NOSE
This is the tip of the lobe, the point at which maximum lift is acheived, if you measure a camshaft from the tip of the nose to the opposite side of the base circle and then subtract the base circle diameter that gives you your cam lift value
LIFT
this is the height of the lobe above the base circle, in essence how far it will open your valves. the 6A13TT has a 1.7:1 rocker cam follower. this multiplies the lift by 1.7
for example if you measure your cam lobe lift to be 5mm, the valves will have a maximum lift of 8.5mm
5 * 1.7 = 8.5
DURATION
Camshaft duration, this is a number given in degrees of crankshaft rotation for how long your camshaft will keep the valves open.
keep in mind that for every one turn a camshaft makes the crankshaft rotates twice.
there are two ways of describing duration,
1 - "
Advertised
" duration which is the number in degrees of crank rotation from the instant the valve starts to open to the instant it becomes closed again this is how most places market their cams to the general public HKS 272. Tomei 264, etc etc
2 - "
Duration @ 0.050"
" (50 thousanths of an inch valve lift.) this is the duration in degrees of crank rotation from the instant the valve passes the 0.050" open point until it is 0.050" away from being closed again. this is what most people like me or engine builders talk in as valves don't generally flow any appreciable ammount of air until the valve is at least 0.050" open. (some places use 0.040" which is 1mm this all depends on the cam maufacturer) obviously this number will be lower than "Advertised duration" because it starts after the instantanous opening point and ends before the final closing point.
for example a HKS cam for an RB26 may have an advertised duration of 272 but its @0.050" duration will be 230ish
A stock VR4 camshaft has about 240 degrees of advertised duration. so that means the angle between the opening point on the camshaft to the closing point will be 120 degrees apart
CENTER LINES
this is where the middle of the camshafts duration occurs in the engines cycle. exactly halfway between the opening and closing points. this is often the point of maximum lift too.
this is measured in degrees of crankshaft rotation.
for example if your cams are set up at 105 intake 110 exhaust it means the centerline of the intake camshaft occurs 110 degrees after TDC and the centerline of the exhaust occurs 110 degrees before TDC
given that a stock cam is 240 degrees (120 either side of the centerline) on these theoretical centerlines 105/110 the intake valves will start opening 15 crank degrees before the piston reaches TDC and the exhaust valves close 10 degrees after TDC this means the intake an exhaust valves are open at the same time for 25 degrees in the time leading upto and shortly after TDC. this is whats called overlap and this is directly effected by the camshaft centerlines. Centerlines and overlap is what you change when you have adjustable cam gears. and is had massive effects on how an engine behaves and where and how it makes its power.
I don't know what the stock centerlines are on a VR4 as I have yet to measure that.
One of my technicians will analyze your camp and make out out specific blueprints and then we contact you about type of profile and options we grind camshafts of every type from basic and stock 2 Street and aggressive lobes ATV 2 horizontal shaft engines 2 Marine and Truck