Gen2 to Gen3 cyl head swap - Help! - MR2 Owners Club Message Board
 
LinkBack Thread Tools
post #1 of 12 (permalink) Old March 14th, 2017, 12:43 Thread Starter
Registered User
 
Join Date: Jun 2008
Location: Fort Myers FL
Posts: 60
OldTrader Rating: (0)
Gen2 to Gen3 cyl head swap - Help!

Currently replacing Gen2 cylinder head with Gen3 (on gen2 block) Learning nothing lines up! Latest problem, the water neck housing that bolts to the gen3 cylinder head has a 3 bolt flange, the gen2 has 2 bolt flange. Modification? Would appreciate help from somebody who has done this swap.

Thanks in advance.
drbhs is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old March 14th, 2017, 16:50
Registered User
 
Join Date: Jan 2006
Location: Alexandra, New Zealand
Age: 56
Posts: 6,830
OldTrader Rating: (3)
I didn't think it was actually possible due to a number of oil & coolant ports not lining up.

Jim
benckj is online now  
post #3 of 12 (permalink) Old March 14th, 2017, 17:38
Registered User
 
Join Date: Apr 2007
Location: Australia
Age: 32
Posts: 150
OldTrader Rating: (1)
No - I believe they will bolt up. You need a different Head gasket so the water lines can flow correctly. ATS can probably help here.

The water neck on the Gen 3 is totally different to the Gen 2. You'll need to source a Gen 3 water neck if your head didn't have one. You can buy these through toyota like I did, if you can't source second hand.

Good Luck!
> P E T E < is offline  
 
post #4 of 12 (permalink) Old March 15th, 2017, 09:32
Registered User
 
Join Date: Nov 2015
Location: Canada, Saskatchewan
Posts: 174
OldTrader Rating: (0)
Quote:
Originally Posted by > P E T E < View Post

The water neck on the Gen 3 is totally different to the Gen 2. You'll need to source a Gen 3 water neck if your head didn't have one. You can buy these through toyota like I did, if you can't source second hand.
Bet you could use the prime or tcs gen4 waterneck adapter.
pcdevine is offline  
post #5 of 12 (permalink) Old March 15th, 2017, 14:33
Registered User
 
Join Date: Oct 2012
Location: Wellington, New Zealand
Posts: 730
OldTrader Rating: (0)
Quote:
Originally Posted by benckj View Post
I didn't think it was actually possible due to a number of oil & coolant ports not lining up.

Jim
It's possible but you need to run a GEN3 oil pump and cam covers. There are a few other things you need too but not sure what they are as I have not done this myself.
GDII is offline  
post #6 of 12 (permalink) Old March 15th, 2017, 15:10 Thread Starter
Registered User
 
Join Date: Jun 2008
Location: Fort Myers FL
Posts: 60
OldTrader Rating: (0)
Funny, all my replies are coming from all you blokes from down under! Have gone to Gen3 water neck, I believe I saw some other modifications for oil and vacuum on line. I thought this was going to be an easy swap, but I haven't had anyone that has actually done it.
drbhs is offline  
post #7 of 12 (permalink) Old March 15th, 2017, 18:32
Registered User
 
Join Date: Apr 2007
Location: Australia
Age: 32
Posts: 150
OldTrader Rating: (1)
Flupstar has done it, but he hasn't posted on these forums for years. I think he's pretty busy these days.

If memory serves be correct the easiest thing to do is run an external oil cooler rather than the Oil to water cooler. This is due to the way the coolant lines flow between the Gen 2 and 3.

I can't remember what running gear you use (Gen 2 or 3) for the water and oil pump.....I would guess Gen 2.

Last edited by > P E T E <; March 15th, 2017 at 20:03.
> P E T E < is offline  
post #8 of 12 (permalink) Old March 15th, 2017, 19:59
Registered User
 
Join Date: Mar 2009
Location: Modesto, CA
Age: 27
Posts: 1,507
OldTrader Rating: (49)
You can use a gen3 head gasket straight up with a gen2 block (and a gen2 head even)

You'll need a gen3 water neck, as mentioned. You'll also need to (ideally) drill and tap one of the bottom bosses for the EVAP thermoswitch (thing with the blue vacuum nipples), off hand IIRC it's 3/8 NPT

You don't need to modify anything timing wise, IIRC. The cams are placed in the same relative position, just bolt on the cam gears and use your gen2 components.

Obviously, you'll also need a gen3 fuel rail since gen2 does not fit.

What are you doing for electronics?
L0s7 is offline  
post #9 of 12 (permalink) Old March 15th, 2017, 20:05
Registered User
 
Join Date: Mar 2009
Location: Modesto, CA
Age: 27
Posts: 1,507
OldTrader Rating: (49)
Plus in/ex manifolds and throttle body, but you should have already realized that
L0s7 is offline  
post #10 of 12 (permalink) Old March 16th, 2017, 11:25
Two Much
click here to visit the sponsor page
 
mister3's Avatar
 
Join Date: Mar 2004
Location: in your bushes
Age: 45
Posts: 19,843
OldTrader Rating: (379)
for the gen3 head use this coolant neck adapter:
https://twosrus.com/catalog/product_...oducts_id=1045

then your stock gen2 coolant neck bolts right up -- super simple

PLEASE LEARN TO READ

PLEASE DO NOT PM ME. IT IS JUST AS EASY TO EMAIL ME DIRECTLY AS IT IS TO SEND A PM
mister3 is offline  
post #11 of 12 (permalink) Old March 16th, 2017, 13:41 Thread Starter
Registered User
 
Join Date: Jun 2008
Location: Fort Myers FL
Posts: 60
OldTrader Rating: (0)
Quote:
Originally Posted by mister3 View Post
for the gen3 head use this coolant neck adapter:
https://twosrus.com/catalog/product_...oducts_id=1045

then your stock gen2 coolant neck bolts right up -- super simple
Thanks for the tip this is exactly what I was looking for.
drbhs is offline  
post #12 of 12 (permalink) Old March 20th, 2017, 11:19 Thread Starter
Registered User
 
Join Date: Jun 2008
Location: Fort Myers FL
Posts: 60
OldTrader Rating: (0)
Using AEM engine management. Could you email me any pics you may have of modifications at drbhs@hotmail.com, Thanks in advance.
drbhs is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MR2 Owners Club Message Board forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: (0 members)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome