camshaft

[leemh1234]

my nova gsi has just snapped the cam shaft again (4th) time think its time to change the head back to standad 1 then if it does it again then block.money money money..y me? :cry:

[Nick]

right , nice one...

[General Baxter]

my nova gsi has just snapped the cam shaft again:

how? its a soild tube of metal

[Mike.]

snapped the shaft again, theres something wrong there mate, its not as if the cam shafts weak in the first place :?

i think your better off changing back to the original head mate

[Adam]

Camshafts dont tend to snap.

What head are you using?

[leemh1234]

gsi polished and ported head and yes it snaps in the middle :evil:

[Adam]

gsi polished and ported head and yes it snaps in the middle :evil:
Hmm, very strange.
Its bad enough for one to go, but 4 :o

Were they snapping before you had the ported head fitted?

[Nick]

ported and polished shouldn't make one slightest bit of difference.

is the head warped at all ?

[Aragorn]

sounds like the top of the head isnt flat or the rocker box isnt flat and when bolting it up its putting pressure on the cam

[Stuart]

or that there is a blocked oil feed causing the shaft to not get oil and then snap.......

[addgsi]

what cam do u keep usin standerd or uprated?

[m.d.]

take the head off and get its parralellism from the headgasket face to the rockerbox face checked, if this is warped then it will cause the rockerbox to bend stressing the cam,

my mate had this problem on his gte, just changed the whole rockerbox and cam for another one and it was fine.

or you could make your next cam an upprated one (brand new) and if it brakes, send it back :wink: