How to know the it's a real Hi- Cam?

[bhp135]

hello, just wanna ask if anyone know how to see if someone is selling the used or after market hi-cam is not a normal one? Scare that kena tipu one day lah...

any tips?

 

[sakuraguy]

its hard to tell.

once fitted then u will realise it, the sound .. the power. of course u wont be putting the high-cam on passenger seat when driving ;) ..

stock is fun!

 

[sam1741]

u can take a stock camm for comparison.....

 

[Fluffy]

yeah..compare it with a ur stock cam.hehe

 

[DRiftAGster]

i know u can mearue the lift by using a caliper, but not really sure about measuring the angle though....

comparing with your stock cam will only let u know u r getting something different from your stock cam, it won't help in confirming whether you have really get the spec (lift and angle) of the cams that you have paid for....

too bad i only know 1 of the way to determine 1 of the spec, not sure bout how to measure the angle.... maybe some other sifu can help u....or ask some experienced mechanics...

 

[bhp135]

thank you for the info, i was also thinking about bringing along the caliper but how to compare with my own cam which still inside the car??? hehe... But I heard something like the connection head to fit the cam pulley have some tips to show , but it's not show the degree and lift off course... better than nothing...

 

[Joeker]

Using a vernier caliper, you are able to know the valve lift by measuring stock cam lobe's heel to toe and compare it against the aftermarket cam lobe's heel to toe.

The higher the heel to toe number, the deeper the valve lifts.

As for valve duration, the angle which the lobe slopes away from the circumference of the camshaft's diameter.

By looking at the stock and aftermarket, you will be able to tell the lobe "Fatness"

The "Fatter" the lobe slope, the longer the valve lifts.

However, be carefull of stock grinded cams that claims to be "hi-cams".

Such cams are merely modified lobe heels.

If lobe heels are grinded poorly, will result losing power and possible severe valvetrain damage.

 

[Joeker]

Here a diagram I made comparing between stock and hi-cam.

 

[Fluffy]

great info joeker.