I'm currently building a bullet proof 1JZ, and I ran into the following problem;
Maybe there is someone who actually put dual valvesprings in a 1jz head, and 1mm oversized 2jz valves, (because this is not a 'drop in') could help...
So first of all 2jz valves are different. The 1jz exhaust valve is stock 30 mm while the 2jz exhaust valve is 29 mm. The 1jz intake valve is 32 mm while the 2jz intake valve is 33,6 mm. So I upgraded to 1 mm Oversized 2jz valves from supertech. This makes my 1jz have an intake valve of 34,6 mm and exhaust stays 30 mm. Anyone who says 2jz valves are a drop in, obviously don't know where they talking about.:icon_cool Of course, it can be done but it takes a lot of work to machine the head.
Thought I share this with other people, becouse I couldn't find anyone on the web who has actually done this personally...
I have some supertech dual valvesprings, wich are actually designed for the 2jz. But the inner valvespring (the little one) doesn't seem to fit the 1jz head.
The problem is that the area just around the valveguides is not machined, it's cast alu. So the inner valve spring doesn't lay flat on the head. I looked at some pictures from a 2jz head and there the surrounding area is machined. Now my question is, if anyone has an 2jz head laying arround, can measure up the distance from the top of the valveguide to the surface just next to the valveguide. Not the surface where the original spring is located, but closer to the valveguide. Here's a pic of what I mean.
The pic is a little unclear but you know what I mean:icon_bigg
Maybe there is someone who actually put dual valvesprings in a 1jz head, and 1mm oversized 2jz valves, (because this is not a 'drop in') could help...
So first of all 2jz valves are different. The 1jz exhaust valve is stock 30 mm while the 2jz exhaust valve is 29 mm. The 1jz intake valve is 32 mm while the 2jz intake valve is 33,6 mm. So I upgraded to 1 mm Oversized 2jz valves from supertech. This makes my 1jz have an intake valve of 34,6 mm and exhaust stays 30 mm. Anyone who says 2jz valves are a drop in, obviously don't know where they talking about.:icon_cool Of course, it can be done but it takes a lot of work to machine the head.
Thought I share this with other people, becouse I couldn't find anyone on the web who has actually done this personally...
I have some supertech dual valvesprings, wich are actually designed for the 2jz. But the inner valvespring (the little one) doesn't seem to fit the 1jz head.
The problem is that the area just around the valveguides is not machined, it's cast alu. So the inner valve spring doesn't lay flat on the head. I looked at some pictures from a 2jz head and there the surrounding area is machined. Now my question is, if anyone has an 2jz head laying arround, can measure up the distance from the top of the valveguide to the surface just next to the valveguide. Not the surface where the original spring is located, but closer to the valveguide. Here's a pic of what I mean.
The pic is a little unclear but you know what I mean:icon_bigg
