Well-Known MemberHMEM Supporting Member
- Sep 12, 2014
- Reaction score
- Modena (motor valley) Italy
Hi Michael, for the last engines I built (Porsche 917 and Bugatti T50) and also for this engine I used high speed steel turning , 36SMnPb14 , this steel, despite the lead, is hardenable with good hardness. This engine doesn't have to fly in an airplane, so no quenching is needed.Hi
What material did you use for the valves?. Chips Looks like free turning steel.
What tolerance are you aiming between stem and guide?
Valves have a 3mm stem, the bore is 3.00 mm, my stem is 2.98-2.96.
Some of my friends reduce the stem up to 2.95-2.93 and their motors work fine.
Their theory is that in case of small coaxiality errors between the head and the stem or errors between the cages hole and the 45 degree chamfer ,there are no leakage problems and everything is simpler and faster, maybe they are right.