BMW M3 Forum (E90 E92) - View Single Post - Build Journal of Signature Wheel Track Project

Signature Wheel BMW · 01-07-2022, 11:34 AM

Our S65 only has 68k miles and is getting Supertech Inconel Exhaust valves, black nitrided intake valves, and springs. Valves will get 5-angle jobs and light ported.

The S65 reaching higher mileage will have 2 weak links: Rod bearings and valve springs. Older valve springs tend to float at high RPM, will end up breaking or snapping the valves which is called "dropped valve". This is catastrophic on the track. If you plan to boost, good idea to get main bearings done and might as well get the crank polished and balanced at that point.

My big surprise is the S65 comes ported out of the factory. BMW puts in a lot of thoughts for this motor, makes it unique.

01-07-2022, 11:34 AM	#22
Signature Wheel BMW Major 1178 Rep 1,146 Posts Drives: Signature BMW Join Date: Sep 2016 Location: IG: signature_kc iTrader: (0)	Supertech Valves Springs and Valves Our S65 only has 68k miles and is getting Supertech Inconel Exhaust valves, black nitrided intake valves, and springs. Valves will get 5-angle jobs and light ported. The S65 reaching higher mileage will have 2 weak links: Rod bearings and valve springs. Older valve springs tend to float at high RPM, will end up breaking or snapping the valves which is called "dropped valve". This is catastrophic on the track. If you plan to boost, good idea to get main bearings done and might as well get the crank polished and balanced at that point. My big surprise is the S65 comes ported out of the factory. BMW puts in a lot of thoughts for this motor, makes it unique. Attached Images __________________ Kohlmann \| BMW Addict \| Signature Performance Wheels \| OBSESSED WITH PERFECTION \| IG: Signature_KC \| Email: kmann.signature@gmail.com Last edited by Signature Wheel BMW; 01-10-2022 at 11:43 PM..
	Appreciate 4 dparm3928.00 k_mann425.50 DrFerry10035.50 reidetailing1105.00 Quote