The rod caps were tightened to their final torque in steps. Finally, the rod bolts were tightened to their final stretch length. This is the most accurate way to tighten rod bolts and is a critical step to ensure good fatigue life.
Our block is now ready to receive the cylinder head.
Cosworth head studs were used to hold the head on. Now we would use ARP studs part number 207-4206. A Cosworth MLS 1.2mm head gasket was also used. Now we would use any high quality MLS head gasket with a folded stopper layer like a JE Pro Seal part number MI1005-039.
Now the 4 Piston head was lowered into position.
The stud threads and the undersides of the nuts were lubricated with ARP assembly lube and torqued down in a cross pattern.
Next our Kelford cams were installed. The cams were put in place and the cam caps hand tightened.
7 comments
interesting comment about the valve job. my experience has been the dimensions and operator are more important than the machinr.
Just some random advice: Manganese bronze needs bigger tolerances compaired to steel guides: They tend to pinch valvestems when warm. Ask me how I know….
A Newen is a CNC single point cutter that cuts in a continuous radius instead of steps. It can also be programmed to open up the seat and blend the seat into the bowls.
How did Toyota make the cylinders of the 2AR-FE’s block so damn strong and rigid? It greatly exceeds the typical limts Honda’s stock cylinders and it even goes pass this semi closed deck 4B11T.
If you are doing any kind of racing that last more than a 1/4 mile, like a 30 minute road racing session, that 4Piston cylinder head will not last long. Expect to find no more valve clearance. Their valve seat job is very poor.
They talk alot and do good marketing on social networks but when there is a real quality problem due to their work they don’t follow up and look for excuses.
We solved this issue by doing a new valve job with new seats and new valves.
This same issue happened on 4 distinct heads all from 4Piston. This same problem happened to a well known USA drag racing team…
And that is exactly what happend to us and we had to redo the valve job!
4piston👎👎