16 replies to this topic

[merther]

New build engine. 1.3 roller rockers 

Would you notice a difference in tappet noise at certain revs? For example, if I’m driving in 4th at 60mph I can hear them tapping away but when I come to a junction or ticking over they are really quiet. Another example, if I sit the car and hold it at certain revs, I can hear the tapping louder than at other revs. If that makes sense. I can also hear the odd intermittent rattle along with the tapping when I hold it at a constant rev (around 3k) any ideas appreciated. 

 

[DeadSquare]

What camshaft have you fitted ?

[whistler]

You need to check if the rockers are touching the inside of the rocker cover.

[ADRay]

Has the noise been present since first start, or did it begin after any time?

I redid my head earlier this year, and mine was making a similar noise after a while. I thought it was tappet noise, but it turned out that the head gasket had blown between cyl 2-3. No leak, no mix of oil and coolant, just a heck of a racket.

[nicklouse]

What cam? What rockers? What cover?

Edited by nicklouse, 19 September 2025 - 10:54 AM.

[merther]

What cam? What rockers? What cover?

Swiftune sw8 cam. Med roller rockers 1.3 ratio. Standard tin type rocker cover but I try and opoull the rocker forward as much as possible when tightening to stop it hitting the rockers. 

[imack]

rockers 1.3 ratio. Standard tin type rocker cover but I try and opoull the rocker forward as much as possible when tightening to stop it hitting the rockers. [/quote]

The tin covers are usually OK. In my experience the rockers normally foul the back inner face of the rocker covers

Edited by imack, 19 September 2025 - 11:40 AM.

[nicklouse]

 

What cam? What rockers? What cover?

Swiftune sw8 cam. Med roller rockers 1.3 ratio. Standard tin type rocker cover but I try and opoull the rocker forward as much as possible when tightening to stop it hitting the rockers. 

 

What is a standard cover to you?

 

never had issues with standard steel (original) covers with 1:1.5 rockers.

take the cover off and repeat your stationary revving.  

[merther]

https://www.ebay.co....ASABEgLk3PD_BwE

 

this is the cover type, I’m running roller rockers but 1.3 ratio. 

[nicklouse]

https://www.ebay.co....ASABEgLk3PD_BwE

 

this is the cover type, I’m running roller rockers but 1.3 ratio. 

Should not be a problem.

[sonscar]

If you are very unlucky it could be piston slap when running lightly loaded,unlikely but out there.Steve,

[alpder]

Was the new cam fitted complete with the optional spring kit?

[absx2]

I`m guessing you followed the camshaft break in procedure for a good 20 minutes on initial start up 

 

I always hate that bit as it seems wrong 

[merther]

Was the new cam fitted complete with the optional spring kit?

Yes it has there road springs fitted.

[merther]

 

I`m guessing you followed the camshaft break in procedure for a good 20 minutes on initial start up 

 

I always hate that bit as it seems wrong 

 

Yep ran for twenty mins at 2k rpm