Here are the clearance notches right after they were cut.
After the block was cleaned, aligned bored, surfaced, sent to WPC for Cryo treatment and to have the cylinder walls WPC treated, we dropped in the King main bearings and the Manley crank. To hold the crank the 4 bolt main caps were fasted down with a Cosworth Stud kit. Cosworth no longer makes parts so now we would probably use ARP studs, part number 207-5403. The studs have a higher torque than stock so the block needs to be aligned honed after they have been installed as the higher torque means a higher clamp load and the bearing bores often distort differently. We used ARP installation lube on the stud threads and under the nut face to ensure that the correct torque values were reached. The studs were tightened in an X pattern across the bottom of the engine.
Our Manley stroker crank is now in place and read for the rods and pistons.
We had previously gapped the rings, hand filing them to have the correct gap and matching them to each bore. The piston pin was lubricated and installed into the rod and piston and the retaining clips were seated. Now the rings are spun onto the JE pistons with the gaps staggered. The rod bearings were installed onto the rod and rod cap and lubricated. The rod bolts were lubricated with ARP’s special assembly lube which is critical for getting the correct torque. Finally, the pistons and rings were lubricated as well as the cylinder walls in anticipation of them being installed.
Using a ring compressor tool, the pistons were tapped into the bores and the rod caps were installed and loosely tightened by hand.
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👎👎