VALVE SPRINGS AND RETAINERS

World famous APE valve springs are made from premium chrome silicone wire for consistant pressure and excellent fatigue life. Racers as well as street riders have come to depend on APE springs for winning performance. For use with any high lift cam and / or agressive camshaft profile.

For the Hayabusa, APE offers VS1300GSX-2 for turbos, nitrous or cams with radical ramps - See specs below.

PART NUMBER SEAT PRESSURE COIL BIND PRICE
STOCK 43 LBS .430" -
VS1300GSX-2 65 LBS .520 $121.72
VS1300GSX 47 LBS

.515
.385" LIFT MAX

$148.69

 

Valve springs should never be run closer than .050" to coil bind. As you can see, OEM springs will only handle a max .380 lift. However at that lift the pressure is too low to properly control the valves at high RPM. APE springs are over 30 LBS higher at .380 -- and can safely handle up to .470" lift, or allow shimming to even higher pressures depending on the application.

PDF instructions for setting valve springs using assembled height method.


VALVE SPRING SHIMS

.060", .030" and .015" thick valve spring shims. A variety of IDs and ODs available.

Click here to see APE's complete list of valve spring shims.

 

 


TITANIUM VALVE SPRING RETAINERS


You'll never see this happen with an APE titanium retainer....

APE valve spring retainers are machined from aircraft quality titanium bar stock in the APE plant on the latest state of the art computerized CNC machinery.CNC machining allows us to offer such advantages as bored taper keeper holes for exact keeper fit. Special gauging fixtures allow dimensions to be held close to provide exact installed heights when assembling the cylinder head.

The stock retainers for the 'Busa are aluminum - not nearly as strong as titanium. Although they seem to work fine in stock motors, as soon as you increase the spring load above what the factory designed the stock retainers, for you run the risk of pulling the valve keepers through the aluminum retainer and dropping the valve in the motor. Also - the bottom of the stock retainer will contact the valve stem seal at about .380" cam lift. Removing material from the bottom of the stock aluminum retainer will only further weaken the stock retainer. APE retainers are .030 shorter than stock. For cam lifts over .410" you nust use APE short valve guides.

These titanium retainers must be used with APE valve springs. Use either APE #VS1300GSX or #VS1300GSX-2 above.

NO MATTER WHO BUILDS YOUR CYLINDER HEAD, INSIST THAT THEY USE APE TITANIUM RETAINERS.

TVSR1300-PRO - Set of 16 retainers -- $245.95 -

For valve lash shim kits, click here.