Wow, didn't look for a few days and this topic is starting to look like the 1jz vs 2jz head flow.
Anywayz.
A few things I have noticed:
- the 1jz headgasket is brand new, fresh from toyota. If the design was inferiour they would have changed it, like you see with the differences between the old and latest 7m headgaskets.
- like it was allready mentioned, both gaskets are designed for different heads, hence there is a reason they're different. Saying a 2j is better because it has one hole more on the lower left corner per cylinder would be an insult to the toyota engineers, like they couldn't come up with the idea to evenly spread the holes around the cycilnders. There is a reason the holes are spread differently around the cylinders.
- just because the gasket blocks off the hole in the lower left side doesn't mean there is no water flowing there, it is just flowing differently and that was designed to be so.
On the hot exhaust side of the cylinder, the 1j has more and bigger holes than the 2j. If you look at the valves on a used engine, you can see the exhaust side valves take a far bigger thermal beating then the intake side so it does seem logical to have more holes on that side than at the intake side. Just my reasoning, why it's different on the 2j I don't know.
For me however it is clear;
1jz head > 1jz HG
2jz head > 2jz HG
Anywayz.
A few things I have noticed:
- the 1jz headgasket is brand new, fresh from toyota. If the design was inferiour they would have changed it, like you see with the differences between the old and latest 7m headgaskets.
- like it was allready mentioned, both gaskets are designed for different heads, hence there is a reason they're different. Saying a 2j is better because it has one hole more on the lower left corner per cylinder would be an insult to the toyota engineers, like they couldn't come up with the idea to evenly spread the holes around the cycilnders. There is a reason the holes are spread differently around the cylinders.
- just because the gasket blocks off the hole in the lower left side doesn't mean there is no water flowing there, it is just flowing differently and that was designed to be so.
On the hot exhaust side of the cylinder, the 1j has more and bigger holes than the 2j. If you look at the valves on a used engine, you can see the exhaust side valves take a far bigger thermal beating then the intake side so it does seem logical to have more holes on that side than at the intake side. Just my reasoning, why it's different on the 2j I don't know.
For me however it is clear;
1jz head > 1jz HG
2jz head > 2jz HG