The black nitride valves are stainless steel valves, with a black treatment that hardens the valves. The Inconel valves are made from a Nimonic 751 alloy which has better resistance to heat then the stainless steel. The Inconel valves are only used on the exhaust side, it is the only side that it is needed to use a higher temperature alloy.
Inconel valves should be used, when an engine yield more then 250Hp if the engine yields more then 800hp we suggest using our Sodium filled/Inconel valves.
Yes, we can custom make any make or model of valve, however a minimum run of 50 of each valve would be required for custom manufacturing, in stainless steel material or Inconel, for Titanium valves, we require 100 valves per szie.
The Nitrided Valve hardness is about 800 Vickers = equivalent to 52 Rc (equivalent because is just a thin layer.
Our stainless valve has a 1,460 F. (approx 1900 F EGT) The INCONEL valves have 1,600 F (approx 2200 F EGT)
Depends on many factors like operating temp., seat hardness, rpms, etc. but a reasonable number are 1000 miles in racing applications
All our pistons come with a specification sheet, please read that sheet carefully. Piston diameter must be measured at the gauge point indicated on the sheet. Required clearence depends on the diameter, alloy, type or forging (full Skirt or Slipper design) application, operation conditions.
The clearence between Rod and Writs pin is 0.010-0.012mm (0.0004"-0.0005")
A) 4032 High Silicon (aprox. 11% of Silicon but enhanced with additional Copper, Nickel & Magnesium) Low expansion alloy. B) 2618 Low Silicon High Expansion alloy. Because most use the 2618 they say it is better, but that is not always like that. In fact they are pretty similar and the difference is not that big
4032 expands 18% less than 2618
For Steel rods: 0.040” (1mm). For Aluminum rods: 0.060” (1.5mm).
Our pistons come with Pins and Locks, however the Rings are sold seperatly
The 8mm shims are sold seperately, and one should alway measure the clearence between cam and valve tip to know what size shims are needed.