,
The Supertech exhaust valves are made of heat resisting Inconel and have a tulip shape for best exhaust flow. For the best heat transfer and strength the exhaust stem is only minimally reduced near the valve head.
You can see the valve backside shapes of the intake (left) and exhaust (right) valves here. The shape is much better for flow. You can see the the reduced diameter stem on the intake valve very clearly here. You can also see the minimally reduced exhaust valve stem as well. On a turbo engine dealing with heat trumps getting the best flow. We used the stock size valves to avoid clash on overlap which can be an issue with big valves on the K motor. We would only run oversize valves on a K motor that is full race that has the VTC and VTEC deactivated.
Stock Honda valve oil seals are used. OEM is usually the best for most applications.
Kelford valve springs and light weight titanium retainers were used to keep things happy. Turbo engines need more valve spring tension to avoid valve float, especially with performance cams with more lift.
The Kelford valve spring is beehive wound out of high quality wire with ground ends and shotpeened after heat treat. Conical springs resist surge by nature and are desirable. The titanium retainers are machined out of bar stock.
Stock Honda valve seats are used to locate and maintain correct installed height of the springs as well as protect the aluminum of the head from chafing.
11 comments
Very good write up I just wondered when you switched heads do you have to use k20 head parts or can you use the k24 parts in the new head ?
Yes you can.
What ecu did you guys use go run it i have hear that k pro cannot run it
It depends either K pro or K flash
Hey awesome write up but was there any modifications done to the k20z3 head for the oil passage or is it a straight up pug and play
You need to modify the front cover.
What exactly must be done to the front cover?
You have to weld a piece on to cover a place that is uncovered. It is pretty apparent when you put the cover against the block
How did u mofidy the sensor plates?
I am thinking to do the same for my Accord Euro CU2 (AUS). In US is called Acura TSX 2nd gen. Do you think the K24Z3 block will mate with K20Z3 cyl. head without any modification of the water passage?
Awesome write up, I would have loved to see dyno numbers of this swap. I also have a k24z2 and I’m trying to find the best head to swap too. I really don’t want to change out all the internals. I’m not finding a lot of write ups for our engine sadly.