1JZ Head Info

HamsMKIV · 11-28-2005, 08:25 PM

I was on the phone with Eric (Zazzn) this evening and we were pondering 1JZ valve specs. I happen to have my head sitting on my bench so I went out to measure it. Everyone posts up what they "think" they know about 1JZ vs. 2JZ so I thought we could put this crap to bed.

Eric, I think we need to create a sticky that is an actual comparison between both the 1JZ and the 2JZ with actual specs, no myths. I have both shortblocks on engine stands so we can do this legit.

Here are the head specs:

1JZGTE
Intake Valves: 31mm
Exhaust Valves: 30mm

2JZGTE
Intake Valves: 33.6mm
Exhaust Vavles: 29mm

- Chris

Ckanderson · 11-28-2005, 08:36 PM

how about taking the 1jz to a flow bench?

tissimo · 11-28-2005, 09:49 PM

Quote:

Originally Posted by Ckanderson

how about taking the 1jz to a flow bench?

HamsMKIV · 11-28-2005, 09:52 PM

Okay so who's the dickhead who gave me a -1 rating for posting up 1JZ head info? That's pretty messed up!

lol "Thanks for the 1JZ head info" and a big ole' -1 RED rating for it.... Fookers.

- Chris

tissimo · 11-28-2005, 10:09 PM

lol.. i have never got this rating thing.. i dont even know what my rating is/how to check it haha...

Interesting on the vavles though.... I wonder how the intake (manifold) flow compairs between the two.... How do the intake ports compair? seems the 1jz has a higher velocity intake to give it some low end i guess??

RudyMTR · 11-28-2005, 10:09 PM

Quote:

Originally Posted by HamsMKIII

Okay so who's the dickhead who gave me a -1 rating for posting up 1JZ head info? That's pretty messed up!

lol "Thanks for the 1JZ head info" and a big ole' -1 RED rating for it.... Fookers.

- Chris

Sent you a +1 to offset you -1, and great info... BTW

Ckanderson · 11-28-2005, 10:10 PM

ok i +1n'd ya....

eps · 11-28-2005, 10:19 PM

Oops, that was me. It was supposed to be a +1! Sorry.

JZA70 QC · 11-28-2005, 10:20 PM

Quote:

Originally Posted by HamsMKIII

Okay so who's the dickhead who gave me a -1 rating for posting up 1JZ head info? That's pretty messed up!

lol "Thanks for the 1JZ head info" and a big ole' -1 RED rating for it.... Fookers.

- Chris

That's prity low! You give use good info and some idiot does this

prity stupid if you ask me, it happened to me too not long ago. How can you figure out hoo did this cause I want to know hoo did it to me.

Anyways great info man

thanx alote and can you check the intake port differences?
1JZ HEAD

2JZ HEAD

Great thread by the way

Quote:

Originally Posted by tissimo

lol.. i have never got this rating thing.. i dont even know what my rating is/how to check it haha...

Clic on your User CP

NJsupraA70 · 11-28-2005, 10:21 PM

Great info. Thanks!

HamsMKIV · 11-28-2005, 10:22 PM

Quote:

Originally Posted by eps

Oops, that was me. It was supposed to be a +1! Sorry.

LOL that's funny. No worries dude, I was kidding around anyhow.

I'm a dickhead and I know it!

- Chris

HamsMKIV · 11-28-2005, 10:23 PM

Ok so next, like tomorrow, I'm going to compare the 1JZ and the 2JZ internals with pictures. I have stock 2JZ internals all broken down, but I need to pull the 1JZ shortblock apart to compare. I think getting the nitty-gritty specs will give us a lot of info.

- Chris

JZA70 QC · 11-28-2005, 10:27 PM

Quote:

Originally Posted by HamsMKIII

Ok so next, like tomorrow, I'm going to compare the 1JZ and the 2JZ internals with pictures. I have stock 2JZ internals all broken down, but I need to pull the 1JZ shortblock apart to compare. I think getting the nitty-gritty specs will give us a lot of info.

- Chris

Great man

FINALY we'll get all the real specs and differences.

ZaZZn · 11-28-2005, 10:32 PM

See the real qestion is can you run 2.6 MM over stock my gut says NO way. but it would have been a nice upgrade for the 1jz for sure to run stock 2jz valves.....

Anyways, why don't we all do our selfs a favor and give each other +1

tissimo · 11-28-2005, 10:34 PM

dont people put 2jz +1mm valves in 7ms.. or was that just talk.. thats 2mm???

HamsMKIV · 11-28-2005, 10:42 PM

I don't know... Maybe the stock sized intake valve would work out ok, but that would still be a big upgrade. I don't know if there's enough room up there to do it. I have a close up shot of the head on my other computer. I'm not sure, I'll have to ask my machinist if he thinks there's enough room to go bigger there. Either way, the +1mm shelf valve for the 2JZ would only be stock size for us. I think we'd have to go with a custom valve for the exhaust side, but that wouldn't be a big deal.

I do think it's interesting that the intake side is 2.6mm smaller.... Very interesting.

- Chris

JZA70 QC · 11-28-2005, 11:00 PM

Don't want to change the subject but what thickness head gasket will you use if you keep your GE pistons on your 1.5J Hams?

HamsMKIV · 11-28-2005, 11:05 PM

Quote:

Originally Posted by JZA70 QC

Don't want to change the subject but what thickness head gasket will you use if you keep your GE pistons on your 1.5J Hams?

Oh I don't have GE pistons... Have you not seen my new shortblock? I thought I posted pics of it... Oh well here it is:

I'm going to run a stock Toyota HG actually. I've gone 10.92 @138 with my MKIV on a stock shortblock and stock Toyota HG. And that was 300' short of the 1/4 running out of gear and bouncing off the rev limiter

- Chris

JZA70 QC · 11-28-2005, 11:15 PM

I ment 2JZ-GE pistons if you thought I ment JE pistons

Sorry for the mix up,, yea I saw that thread with you new shortblock, man great project but didn't you say you wanted more compression on your 1.5J

or maby I hallucinated this

HamsMKIV · 11-28-2005, 11:20 PM

Oh yeah, I had custom made higher compression pistons made. I want big time response because I was sick of the no-response 1JZ single. I wanted more displacement and more compression. My pistons are punched .040 over and they're 9.0:1.

- Chris

tissimo · 11-28-2005, 11:23 PM

Quote:

Originally Posted by HamsMKIII

Oh I don't have GE pistons... Have you not seen my new shortblock? I thought I posted pics of it... Oh well here it is:

I'm going to run a stock Toyota HG actually. I've gone 10.92 @138 with my MKIV on a stock shortblock and stock Toyota HG. And that was 300' short of the 1/4 running out of gear and bouncing off the rev limiter

- Chris

showoff

HamsMKIV · 11-28-2005, 11:25 PM

LOL you goof

Spoolin Turbo · 11-29-2005, 01:37 AM

I told you guys already that the 1JZ was +1mm over the 2JZ on the exhaust side. Keep bringin up old news.

What kinda rods you got in your new block. Look like Eagle rods.

perf0rmance · 11-29-2005, 01:59 AM

I know this is off topic, but I'd like to know what your compression would be if you slapped a 1JZ onto a stock GTE block with a stock toyota MHG.

As for the stock 1JZ head, HAMS, could you get some pictures of the dome and compare it to the 2JZ head? I'm curious to see how they differ.

joseph

GrandLordKhorne · 11-29-2005, 05:58 PM

Two questions… First of all, other than face diameter, how do the valves from a 2J compare to the 1J (length, shaft diameter, weigh, ext?)… I was also wondering how 2JZ rods compare to 1JZ rods and if anyone has ever seen aftermarket H beams for a 1JZ other than the Greddy”s??

11-28-2005, 08:25 PM	#1
HamsMKIV Your Neighborhood Pikey Join Date: Nov 2002 Location: Dallas, TX Age: 35 Posts: 3,363	1JZ Head Info I was on the phone with Eric (Zazzn) this evening and we were pondering 1JZ valve specs. I happen to have my head sitting on my bench so I went out to measure it. Everyone posts up what they "think" they know about 1JZ vs. 2JZ so I thought we could put this crap to bed. Eric, I think we need to create a sticky that is an actual comparison between both the 1JZ and the 2JZ with actual specs, no myths. I have both shortblocks on engine stands so we can do this legit. Here are the head specs: 1JZGTE Intake Valves: 31mm Exhaust Valves: 30mm 2JZGTE Intake Valves: 33.6mm Exhaust Vavles: 29mm - Chris __________________ Out of the game for a while. Last edited by HamsMKIV; 11-28-2005 at 08:39 PM.

11-28-2005, 09:52 PM	#4
HamsMKIV Your Neighborhood Pikey Join Date: Nov 2002 Location: Dallas, TX Age: 35 Posts: 3,363	Okay so who's the dickhead who gave me a -1 rating for posting up 1JZ head info? That's pretty messed up! lol "Thanks for the 1JZ head info" and a big ole' -1 RED rating for it.... Fookers. - Chris __________________ Out of the game for a while.

11-28-2005, 10:23 PM	#12
HamsMKIV Your Neighborhood Pikey Join Date: Nov 2002 Location: Dallas, TX Age: 35 Posts: 3,363	Ok so next, like tomorrow, I'm going to compare the 1JZ and the 2JZ internals with pictures. I have stock 2JZ internals all broken down, but I need to pull the 1JZ shortblock apart to compare. I think getting the nitty-gritty specs will give us a lot of info. - Chris __________________ Out of the game for a while.

11-28-2005, 10:42 PM	#16
HamsMKIV Your Neighborhood Pikey Join Date: Nov 2002 Location: Dallas, TX Age: 35 Posts: 3,363	I don't know... Maybe the stock sized intake valve would work out ok, but that would still be a big upgrade. I don't know if there's enough room up there to do it. I have a close up shot of the head on my other computer. I'm not sure, I'll have to ask my machinist if he thinks there's enough room to go bigger there. Either way, the +1mm shelf valve for the 2JZ would only be stock size for us. I think we'd have to go with a custom valve for the exhaust side, but that wouldn't be a big deal. I do think it's interesting that the intake side is 2.6mm smaller.... Very interesting. - Chris __________________ Out of the game for a while.

11-28-2005, 11:20 PM	#20
HamsMKIV Your Neighborhood Pikey Join Date: Nov 2002 Location: Dallas, TX Age: 35 Posts: 3,363	Oh yeah, I had custom made higher compression pistons made. I want big time response because I was sick of the no-response 1JZ single. I wanted more displacement and more compression. My pistons are punched .040 over and they're 9.0:1. - Chris __________________ Out of the game for a while.

11-28-2005, 08:36 PM	#2
Ckanderson Republican Join Date: Jun 2003 Location: Southbay. Age: 27 Posts: 8,440	how about taking the 1jz to a flow bench?

11-28-2005, 10:09 PM	#5
tissimo Stock is boring :( Join Date: Nov 2002 Location: Melbourne, FL Age: 25 Posts: 5,728	lol.. i have never got this rating thing.. i dont even know what my rating is/how to check it haha... Interesting on the vavles though.... I wonder how the intake (manifold) flow compairs between the two.... How do the intake ports compair? seems the 1jz has a higher velocity intake to give it some low end i guess??

11-28-2005, 10:10 PM	#7
Ckanderson Republican Join Date: Jun 2003 Location: Southbay. Age: 27 Posts: 8,440	ok i +1n'd ya....

11-28-2005, 10:19 PM	#8
eps Banned Join Date: Aug 2004 Location: USA Age: 24 Posts: 341	Oops, that was me. It was supposed to be a +1! Sorry.

11-28-2005, 10:21 PM	#10
NJsupraA70 ........................ Join Date: Aug 2002 Location: .. Age: 29 Posts: 4,120	Great info. Thanks!

11-28-2005, 10:32 PM	#14
ZaZZn Moderator l337 M0d3r4t0r Join Date: Feb 2002 Location: Toronto/Montreal Age: 28 Posts: 11,999	See the real qestion is can you run 2.6 MM over stock my gut says NO way. but it would have been a nice upgrade for the 1jz for sure to run stock 2jz valves..... Anyways, why don't we all do our selfs a favor and give each other +1

11-28-2005, 10:34 PM	#15
tissimo Stock is boring :( Join Date: Nov 2002 Location: Melbourne, FL Age: 25 Posts: 5,728	dont people put 2jz +1mm valves in 7ms.. or was that just talk.. thats 2mm???

11-28-2005, 11:00 PM	#17
JZA70 QC Member! Join Date: Sep 2005 Location: Somewhere cold Age: 30 Posts: 289	Don't want to change the subject but what thickness head gasket will you use if you keep your GE pistons on your 1.5J Hams?

11-28-2005, 11:15 PM	#19
JZA70 QC Member! Join Date: Sep 2005 Location: Somewhere cold Age: 30 Posts: 289	I ment 2JZ-GE pistons if you thought I ment JE pistons Sorry for the mix up,, yea I saw that thread with you new shortblock, man great project but didn't you say you wanted more compression on your 1.5J or maby I hallucinated this

11-28-2005, 11:25 PM	#22
HamsMKIV Your Neighborhood Pikey Join Date: Nov 2002 Location: Dallas, TX Age: 35 Posts: 3,363	LOL you goof

11-29-2005, 01:37 AM	#23
Spoolin Turbo Banned Join Date: Mar 2003 Location: Canada Age: 29 Posts: 2,385	I told you guys already that the 1JZ was +1mm over the 2JZ on the exhaust side. Keep bringin up old news. What kinda rods you got in your new block. Look like Eagle rods. Last edited by Spoolin Turbo; 11-29-2005 at 01:40 AM.

11-29-2005, 01:59 AM	#24
perf0rmance GT40 1.5JZ Join Date: Mar 2003 Location: California Posts: 1,201	I know this is off topic, but I'd like to know what your compression would be if you slapped a 1JZ onto a stock GTE block with a stock toyota MHG. As for the stock 1JZ head, HAMS, could you get some pictures of the dome and compare it to the 2JZ head? I'm curious to see how they differ. joseph

11-29-2005, 05:58 PM	#25
GrandLordKhorne Evil Turbo Penguin... Join Date: Nov 2004 Location: South Mass, almost RI Age: 30 Posts: 578	Two questions… First of all, other than face diameter, how do the valves from a 2J compare to the 1J (length, shaft diameter, weigh, ext?)… I was also wondering how 2JZ rods compare to 1JZ rods and if anyone has ever seen aftermarket H beams for a 1JZ other than the Greddy”s??

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