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chris sthill
Newbie
ny
318 tt

Posts: 1
Reg: 10-2011

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Saturday, October 22, 2011 - 03:43 pm, by:  chris sthill (Socachris) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i am having a lot of trouble with my 1jz head on the 2jz block . i popped my timing belt and messed up 2 of the valves on the jz head , and noticed that the number 6 piston ring land broke so i decided to single turbo it and i changed the piston to the 1jz pistons but I'm only getting 10 on my vacuum gauge. Could it be because i have the 1jz pistons in there and the 1jz head gasket dropping my compression like crazy???? if i try to full throttle it i would see at leave 10 on the gauge but no power please help......
David Ward
TryHard
Victoria
2.5 TT & 3.0 TT

Posts: 498
Reg: 10-2006

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Saturday, October 22, 2011 - 04:35 pm, by:  David Ward (Djwtoyota) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

How much research and advice did you seek before going down that path Chris?
Not sure what relevance going to a single turbo has to your problems?
Do you mean 10 psi vacuum on your boost gauge?
Not sure what the last sentence is meant to say though?
David Ward
TryHard
Victoria
2.5 TT & 3.0 TT

Posts: 499
Reg: 10-2006

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Saturday, October 22, 2011 - 04:46 pm, by:  David Ward (Djwtoyota) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I may stand to be corrected here but I thought the 1jzgte head was supposed to be non-interference? Is that so?
chris sthill
Newbie
ny
318 tt

Posts: 2
Reg: 10-2011

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Saturday, October 22, 2011 - 04:57 pm, by:  chris sthill (Socachris) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Well David ,the 1jzgte head is non interference but when that head is on a 2jz ge block the valves are in danger due to the fact the pistons are slightly different. and yes its 10 psi on the boost gauge ... sorry for that
David Ward
DieHard
Victoria
2.5 TT & 3.0 TT

Posts: 501
Reg: 10-2006

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Saturday, October 22, 2011 - 05:09 pm, by:  David Ward (Djwtoyota) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I'm guessing that being the case, it would increase the compression ratio excessively, without a thicker head gasket?
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 6510
Reg: 03-2006

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Saturday, October 22, 2011 - 06:23 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

So you have 1JZGTE pistons inside a 2GZJE block ?

I thought the 2j had a larger bore , thus meaning you cant use the 1j pistons ?
Shane Haverkamp
DieHard
nsw
soarer TT

Posts: 657
Reg: 10-2007

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Saturday, October 22, 2011 - 08:59 pm, by:  Shane Haverkamp (Havabeer) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

if the piston wasnt the right size wouldnt it be all dodgy and rough at idle like your only running on 5 pistons.
Adrian McGuire
DieHard
Queensland
soarer 2.5 turbo

Posts: 536
Reg: 12-2010

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Saturday, October 22, 2011 - 09:05 pm, by:  Adrian McGuire (Adro) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Have you done a compression test ?
Matt Newman
TryHard
QLD
soarer tt

Posts: 470
Reg: 11-2007

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Saturday, October 22, 2011 - 10:53 pm, by:  Matt Newman (Soarersrock) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Daniel the piston is the same its the stroke that changes :-)
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 6513
Reg: 03-2006

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Sunday, October 23, 2011 - 07:11 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks Matt , I thought there was 2mm difference in the bore sizing , thanks .
Matt Newman
TryHard
QLD
soarer tt

Posts: 472
Reg: 11-2007

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Sunday, October 23, 2011 - 11:57 pm, by:  Matt Newman (Soarersrock) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

no problems the extra 500ml comes from a 10mm longer stroke and i guess a bit extra in the head (not 100% on that though)
Chris Sthill
Newbie
ny
318 tt

Posts: 3
Reg: 10-2011

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Monday, October 24, 2011 - 11:29 am, by:  Chris Sthill (Socachris) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

well i decided to buy another 2jz ge non vvti this time and see how it goes., due to the crank sprocket moving around on its own... i came to the conclusion that the keyway broke out of its groove....Yes i was told i could put the 1jz pistons and it would be fine ....so my question is does the 1jz gte is better then the 2jz ge better in compression wise?
Adrian McGuire
DieHard
Queensland
soarer 2.5 turbo

Posts: 537
Reg: 12-2010

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Monday, October 24, 2011 - 11:52 am, by:  Adrian McGuire (Adro) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

the 1jz gte motor runs a decompressed motor because of the turbo. it runs at about 8.5/1 compression. the 2jz ge block being N/A runs at about 11.3/1 compression. if you are building a 1.5jz turbo motor i would have thought you had to run the same compression rate as the 1 jz otherwise when it comes on boost there will be far to much compression for the block and head to handle which will result in head gasket failure at the least.
Matt Newman
TryHard
QLD
soarer tt

Posts: 473
Reg: 11-2007

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Monday, October 24, 2011 - 06:25 pm, by:  Matt Newman (Soarersrock) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

just change the pistons over and its a basically a gte block but no oil squirters :-) i have some 2jzgte pistons and rods if your keen to.

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