PDA

View Full Version : Is cutting valve cover to expose cam gears necessary?


sharky
30-06-2005, 07:28 PM
I recently bought some spoon cam sprockets and it was mentioned to me that it might be a good idea to expose the cam gears. Is this necessary? I was told that it makes tuning the camshafts easier. Will i need to have the gears regularly tuned warranting cutting the valve cover?
garett
30-06-2005, 07:54 PM
well it does... cos you will have to take the cover off every time you wanna play with them... make sure you do it properly though please dont use some wack ass saw, get it professionally done with a bandsaw. unless you have these kinds of tools.


prolly not necessary really
tanghy
30-06-2005, 07:56 PM
do not cut!
not worth risk
u only tune it once and that's it
tanghy
30-06-2005, 07:57 PM
having an exposed cover risks pebble bouncing up going into the belt, seizing up yr head and basically costing you thousands
strepto
30-06-2005, 08:00 PM
that it might be a good idea to expose the cam gears.

No. No No No No NO! Its is not a good idea! The camgears are sealed for a reason. First of all, they rotate at a speed twice as fast as the RPM (One crank rotation = 2 camgear rotations) and you don't want anything near them. Second, cutting the valvecover exposes the timingbelt and tensioner to dust and humidity. And you dont want that, as all. Humid air and condence can actually stretch the timingbelt over time, which can be disasterous for the engine.

Use a cut one when tuning on the dyno. Ones done - make sure you use a solid non-cut one.
sharky
30-06-2005, 08:04 PM
thats what i thought, it had me stumped because i couldnt work out why i would need to adjust the cam timing more than once after it was set, unless the bolts worked loose which i doubt unless of couse i put the front end into something.
strepto
30-06-2005, 08:15 PM
Thats why I love the Corsa camgears. They have a locknut which prevents slipping. I can be locked at every degree.

http://home.comcast.net/~bigteggie/stcorsa/7.jpg
http://home.comcast.net/~bigteggie/stcorsa/5.jpg
http://home.comcast.net/~bigteggie/stcorsa/2.jpg
sharky
30-06-2005, 08:22 PM
would locktite on the bolts help prevent any slipping?
strepto
30-06-2005, 09:19 PM
No. Use ARP assembly lube for the locknuts, and make sure to torque and loose the nuts three times before you give it the final run.
sharky
30-06-2005, 10:47 PM
cheers dude, the guy who is going to fit and tune them for me has been racing since the craddle, he should know what he's doing but i will keep your advice on hand
Limbo
30-06-2005, 11:17 PM
you can get the clear covers so that you can look at them if you like, JDM style...
PhatSol
01-07-2005, 12:03 AM
First of all, they rotate at a speed twice as fast as the RPM (One crank rotation = 2 camgear rotations) and you don't want anything near them.

The camgears rotate at half the speed of the crank. 2 crank rotations = 1 camgear rotation.

http://home.comcast.net/%7Ebigteggie/stcorsa/7.jpg

Won't those camgears be rather unbalanced due to the lock bolt being off centre?
sharky
01-07-2005, 06:19 PM
you can get the clear covers so that you can look at them if you like, JDM style...

nah, sleeper is better ;)
Boost
01-07-2005, 06:30 PM
in regards to those cam gears shown.. there are only 21 or so hole position. How does one get the exact deg. of advancing or retardation with on those number of holes.?
How many degrees can those gears rotate?. Cause with the HKS RB20 cam gears they allow for 20 deg. of advancing and retarding. And with the gears shown, it doesnt look like it can provide 20deg. looks like on 10degs.