Ive now had 2 Rs Cosworths being a 4x4 and a rwd and both have decided to Snap the exhaust cam at the rear 2nd cam cap from the back!

Can anyone tell me if this is common or why this happens ?

Am i guessing it could be the heat from the turbo/exhaust at the rear on that side or perhapes to many revs up to 6.5k ? and engine strain form pushing it hard ? (I have heard some miffs in the past about heat.)

This is a pic of the latest one that snapped but the other was in the dead same place.

Both Rs Cosworths were and are stage 3 est 350hp

Any help would be great please as dont want to do it again lol

 

What kind of condition is the rear bearing in? this bearing is the furthest thing away from the oil supply and can suffer, I imagine if its worn and the next one down isnt then it will be causing the cam to flex as the valve springs put pressure on it and will eventually snap. I suggest that you may need a new rear cam cap, the way to test is remove the followers, put the cam in with one cap at a time and test for play.

 

Hmm intresting i shall have to look at that!

Ive brought a whole new engine for the cossie so i wont be using that head again or cams but im just miffed why it happend on 2 diffrent cossie's

Thank you

 

i think your damaging the cams on fitment. if you dont tighten them down equally ie- 1/4 of a turn on each nut then you can snap the cam.

 

the wear will be more in the cap than the head or the cam itself as the cap takes all the thrust from the springs

 

my mate snapped his exhaust cam in the exact same place mate : dont know why but i said he should stop driving it like a cunt ive only ever seen/known about his cam snapping so for yours to go in the same place twice there must be somthing going on...............

 

Im just jinxed as it was 2 diffrent cossies it happend to me with! And i do drive like a cunt to!

 

lol , the funny thing is he wasnt even drivein was he dean?

 

no thats right he said it was his mate i still cant believe what happened to that cam