Cams and rockers

[tikihut]

]I recently purchased a 3.2 hot rod motor. With approximately 30k mi. My builder says there’s damage to the rockers. Currently running rsr cams with pauter rockers. Previous owner thought the cams were a little peaky. My builder suggested different cams with a broader power band and rebuilt Porsche rockers. I’m curious. What’s the difference between rockers and also what would be a good cam choice ?
Any input would be appreciated!

[H-viken]

Did say what type of damage? Pauter rockers aren’t cheap I remember correctly

[tikihut]

My understanding is due to wear. I suppose cams can be reground and rockers rebuilt.

[cabmandone]

Seems like cam and rocker wear to the point they need replaced with 30K on them would indicate other problems. Maybe the oil tubes in the cam towers are plugged and the cams aren't getting proper oil?

[reclino]

With hot cams.and high dollar rockers, they may have also used stiffer valve springs. Stiff springs are known to accelerate wear on the rockers and cams.

[tikihut]

I believe that is the case Thanks guys!

[Jonny042]

I've spent quite a bit of time looking at cam profiles lately and yeah, if they are RSR sprint cams they are pretty racy. Maybe too much so, depending on what the motor is being used for. If that's 30K race miles at 8000RPM then it's just regular wear

[stownsen914]

Originally Posted by Jonny042

RSR sprint cams they are pretty racy. Maybe too much so, depending on what the motor is being used for. If that's 30K race miles at 8000RPM then it's just regular wear

That's what I was going to say

[tikihut]

]Makes a lot of sense. The motors going in a 73 track car with minimal street use. I’m all about driving it vs. rebuilding. Thinking 964 cams and stock rockers might be a reliable way to go. Thanks for the input guys!

[targa72e]

964 cams may be too mild if the rest of the engine was built around sprint cams. This could result in to much dynamic compression. Generally you would be looking at also running very a very high compression ratio with sprint cams. You might want to post more information about the rest of the engine build. I would also be a good idea to talk with the company's that supply camshafts about your engine details and desired outcomes, they can probably make a good recommendation.

john

[Mark Henry]

The wear is likely the springs are too heavy or running to close to coil bind, I'd want to do a full check of the heads.

[stownsen914]

Re: cams, it may be a good idea to talk to one of the cam grinders and discuss what you're looking for in terms of usage, sportiness, etc. RSR cams would indeed be a bit peaky for street motor. 964 cams might be a bit mild, especially if the engine is carbed or ITBs.