Hi all.
I have a 911 3.2 short stroke engine with 290hp and 247ft lbf. Max power is at approx. 6900rpm. Rev limiter set at 7200rpm.
It was built in 2016 and has the following spec:
- 3.0 SC 204hp engine case, crank and cam towers
- 3.0 SC 180hp heads with 39mm intake ports.
- 3.2 Mahle RSR piston and cylinder.
- Webcam 120/104 "RSR" spec cams.
- Aasco race springs.
- Aasco titan retainers.
- Twin plug.
- PMO 46mm throttle bodies.
- Full sequential ecu.
- Eisenmann exhaust with 39mm primaries and modified muffler.
Engine always driven on good quality oil.
So to the case:
I have issues with wear on some of the rockers and cams I have to address. Other rockers and cam lobes are very good. See this thread:
https://forums.pelicanparts.com/911-engine-rebuilding-forum/1032992-colour-camshaft.html
I know I have to change to new cams and I have been thinking that the Aasco valve springs might be too tough on the cam lobes and thus one of the reasons for the wear I have found. So before I start buying parts I thought I would discuss this with you here on Pelican.
Should I change back to original valve springs and retainers? Can they handle the lift and profile my cams has?
Should I buy new billet cams or hardweld my old ones?
Should I hard weld my old rockers or buy factory new ones, and should the hard weld ones be coated with hard chrome and why(the technical reason)?
What combo of the above or other combos will be the best solution for my engine? And this time it must be durable for many years, obviously.
I do NOT track the car, it is only street driven, though quite inspirated at times.
Perhaps Webcam, Camgrinder, Steve Weiner, other reputable engine builders or you guys can give my good input
Here's the cam and valve spring specs and the wear problems:
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