| Author | Topic |
|---|
Location:
Auckland NZ
Registered:
November 2002
|
|
1jz head on a 2jz block
|
Tue, 19 November 2002 03:26
|
 |
Hey,
Has anyone tried/measured this yet, I no it is quite common in japan they call the result a 1.5j but would be interested to know if someone has given it ago does anything have to be retapped/modified, and will the 1jz 5spd bolt onto the back of the 2jz block? Because I have a built short block 2jz sitting in my garage and it would make an interesting conversion into my jzx100 chaser
Cheers
James
|
|
|
I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 04:37
|
|
Interesting? Yes.
Functional? Maybe.
The head itself will physically bolt on, but I can't specifically comment on all the ancillaries.
I suppose you have to ask whether the 1JZ head will actually flow as well as the 2JZ head. I am wondering why it is done and what advantage is gained.
Cheers Dave.
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 05:07
|
|
The "1.5JZ" is quite common in Japan now, but you have to understand why they do it. There are plenty of JZA70 owners with worn out 1JZ's, and it turns out that a brand new 2JZ bottom end is cheaper than rebuilding the 1JZ bottom end - so they simply swap in the new 2JZ core and leave everything else as is. The result is a fresh engine with the extra benefit of another 500cc.
I haven't heard of anyone with a 2JZ-GTE who replaced the head with a 1JZ-GTE item - I can't think of any reason this would be an improvement.
|
|
|
Location:
Auckland NZ
Registered:
November 2002
|
|
|
Location:
Southern Sydney
Registered:
August 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 06:24
|
|
It was my understanding that the 1jz head was the one designed by Yamaha and so was a technically supperior design then the 2jz which was designed in house at toyota.
However, the 2jz head is sure to have a larger flow capacity and therefore be better suited to a High HP engine?
|
|
|
Location:
boston mass usa
Registered:
November 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 08:14
|
|
|
well a few ppl have dont it here in the states but i personally dont see the benifits of it really all the main diff. the 1j is a .02 head shave. the 2j has bigger ports intake and exhaust, also the 2j is alot better for air flow. but as said in jp its use full because of the price here in the states there are more 2jz then 1jz hanging around
|
|
|
Location:
Auckland NZ
Registered:
November 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 08:37
|
|
Hey,
Thats cool I appreciate all the feedback I understand that the 1j head might not flow as much as a 2j but my car runs the VVT-i head which from what I can decifer in the jap sites is better than the earlier model. Secondly does the R154 box fit on the back of the 2jz (I think they used this box on the NA 2JZ??)
Cheers
James
|
|
|
I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 09:12
|
|
The R154 will bolt up behind the 2JZ, provided you have the correct bellhousing etc. These are found behind 1JZGTEs. They used the W58 behind the GE.
I think I have worked it out now....you want to put the 2JZ bottom end in your Chaser with the VVTi head on top?
If so, you need an oil supply to the VVTi. Also you may want to flow your head just to make sure it's up to the job of the bottom end, and possibly look into 2JZGTE VVTi cams (at least get the specs so you can compare with yours).
|
|
|
Location:
newcastle
Registered:
June 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 09:13
|
|
|
Just a point of interest have you had the 1jz vvti on a dyno or g tech im interested in how much power can be squeezed from these
|
|
|
Location:
Auckland NZ
Registered:
November 2002
|
|
Re: 1jz head on a 2jz block
|
Tue, 19 November 2002 19:58
|
|
|
Haven't yet had it on the dyno, but should have within the next week or so, will post the results if interested. But have pulled a 13.4@101mph down the quarter, with 3inch TRD Exhaust, and TRD air filter and computer being the only mods.
|
|
|
Location:
newcastle
Registered:
June 2002
|
|
Re: 1jz head on a 2jz block
|
Wed, 20 November 2002 08:55
|
|
13.4 's not bad how much boost do you run and how much will this turbo take ??
what computer mods have you run .will the engine still run vvti
|
|
|
Location:
Melbourne
Registered:
November 2002
|
|
Re: 1jz head on a 2jz block
|
Thu, 21 November 2002 12:03
|
|
|
And what tyres were you using?
|
|
|
Location:
Auckland NZ
Registered:
November 2002
|
|
Re: 1jz head on a 2jz block
|
Sun, 15 December 2002 09:31
|
|
|
Running 1.1 bar boost, which is pretty much the limit of the whole thing, as for tyres nothing special just some bridgestone's on the factory 17in TRD wheels
|
|
|
