General Car Related Discussion. To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.

MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibilty??

Thread Tools
 
Search this Thread
 
Old 04-08-2006 | 05:18 PM
  #1  
TwoCossieBob's Avatar
TwoCossieBob
Thread Starter
Regular Contributor
 
Joined: Jul 2003
Posts: 249
Likes: 0
From: Berkshire
Default MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibilty??

Hi All

Please can someone help? I have an urgent need to get my MKII XR2 Fiesta racer going again after an engine failure!

Will a MKIII XR2i CVH engine/head be ok to use with my MK11 Fiesta XR2 standard pre lean burn Weber (DTF?) carb and Ford ECU? I must retain the carb because the regulations do not allow the use of fuel injection on my car.

My blown up XR2 engine was a pre 1986 lean burn one with the true hemispherical head chambers. Can I just swap the engines over and retain my carb or are the compression ratio's or the fixing of the relevant inlet manifold different? Does it make any difference to what I plan if the XR2i engine was originally mechanically or elctronically fuel injected?

Does anyone know?

Thanks
Bob
Old 04-08-2006 | 05:26 PM
  #2  
Rick's Avatar
Rick
15K+ Super Poster!!
 
Joined: May 2003
Posts: 15,885
Likes: 17
From: Stockport, Cheshire
Default

the 2i heads have the same chambers as the pre lean burn heads.
Old 04-08-2006 | 05:52 PM
  #3  
TwoCossieBob's Avatar
TwoCossieBob
Thread Starter
Regular Contributor
 
Joined: Jul 2003
Posts: 249
Likes: 0
From: Berkshire
Default MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibilty??

Thanks for that Rick.

Do you or does anyone else know if the piston tops and compression ratio will allow me to use the MKII carb instaed of the injection?

Thanks
Bob
Old 04-08-2006 | 06:00 PM
  #4  
Rick's Avatar
Rick
15K+ Super Poster!!
 
Joined: May 2003
Posts: 15,885
Likes: 17
From: Stockport, Cheshire
Default

compression ratio is identical on all 1.6 engines expect the turbo at 9.5:1 (8.3:1)

The carb will go straight on. The head of an xr2i, late xr3i and fiesta turbo has cut outs in the inlet ports for the injectors. The inlet manifild for the carb doesn't, so just blanks these off.
Old 04-08-2006 | 06:17 PM
  #5  
Fiecos Dan's Avatar
Fiecos Dan
PassionFord Post Whore!!
 
Joined: Oct 2003
Posts: 4,775
Likes: 0
From: S/E Kent, Thanet
Default

efi's are 9.75:1 c/r by memory.


What do you want to do?

2i engine on carb?
if so then yes it will work.

2i bottom end with lean burn head and carb?
Yes as long as pistons dont go past 0.5mm above block on TDC. And this will give you a higher C/R which is good for a N/A car.
(i dont know what xr2i pistons look like)

Xr2 l/b bottom end with 2i head, and carb?
Yes but the compression ratio will be lower.
Old 04-08-2006 | 06:56 PM
  #6  
Rick's Avatar
Rick
15K+ Super Poster!!
 
Joined: May 2003
Posts: 15,885
Likes: 17
From: Stockport, Cheshire
Default

2i engine on carb?
if so then yes it will work.
Thats the one
Old 04-08-2006 | 08:12 PM
  #7  
Fiecos Dan's Avatar
Fiecos Dan
PassionFord Post Whore!!
 
Joined: Oct 2003
Posts: 4,775
Likes: 0
From: S/E Kent, Thanet
Default

Originally Posted by Rick
2i engine on carb?
if so then yes it will work.
Thats the one
Old 04-08-2006 | 09:02 PM
  #8  
TwoCossieBob's Avatar
TwoCossieBob
Thread Starter
Regular Contributor
 
Joined: Jul 2003
Posts: 249
Likes: 0
From: Berkshire
Default MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibilty??

Thanks for the advice Rick and Fiesta Cossie.

I want to put the XR2 carb and ecu etc onto the XR2i engine (complete bottom end and head), so I assume its ok to go ahead unless anyone else says differently?

Thanks
Bob
Old 04-08-2006 | 09:14 PM
  #9  
digita1dragon's Avatar
digita1dragon
Advanced PassionFord User
 
Joined: May 2003
Posts: 2,136
Likes: 0
From: Bristol / Solihull
Default

Injector cut-outs need addressing dont they?
Old 04-08-2006 | 09:37 PM
  #10  
TwoCossieBob's Avatar
TwoCossieBob
Thread Starter
Regular Contributor
 
Joined: Jul 2003
Posts: 249
Likes: 0
From: Berkshire
Default MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibilty??

So I need to address the injector cut outs?

How is this done? Any info please?

Thanks
Bob
Old 05-08-2006 | 03:27 AM
  #11  
Alan s1's Avatar
Alan s1
PassionFord Post Whore!!
 
Joined: Apr 2004
Posts: 7,053
Likes: 0
From: oxfordshire/berkshire
Default Re: MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibil

Originally Posted by TwoCossieBob
So I need to address the injector cut outs?

How is this done? Any info please?

Thanks
Bob
From memory my m8 put a rebuilt xr21 (efi) engine in his xr2 mk2 with the carbs and all the old bits and bobs like ecu ect all i can rember was he had to use 2 inlet gaskets or some thing

And the car went like fook when it was all fitted
Old 05-08-2006 | 07:58 AM
  #12  
Fiecos Dan's Avatar
Fiecos Dan
PassionFord Post Whore!!
 
Joined: Oct 2003
Posts: 4,775
Likes: 0
From: S/E Kent, Thanet
Default

As said, i'm not to sure if the xr2 inlet and gasket will cover the injector cut outs.

Might need to make a 1 off gasket out of thin gauge ally or copper, and put abit of good sealant on it around the injector cut outs.


if not and if the L/B head can fit (matters on piston design), this will give you a better C/r and a head designed for carbs.
Old 05-08-2006 | 08:06 AM
  #13  
Alan s1's Avatar
Alan s1
PassionFord Post Whore!!
 
Joined: Apr 2004
Posts: 7,053
Likes: 0
From: oxfordshire/berkshire
Default

Originally Posted by fiesta cossie
As said, i'm not to sure if the xr2 inlet and gasket will cover the injector cut outs.

Might need to make a 1 off gasket out of thin gauge ally or copper, and put abit of good sealant on it around the injector cut outs.


if not and if the L/B head can fit (matters on piston design), this will give you a better C/r and a head designed for carbs.
That rings a bell
Old 05-08-2006 | 08:41 AM
  #14  
Fiecos Dan's Avatar
Fiecos Dan
PassionFord Post Whore!!
 
Joined: Oct 2003
Posts: 4,775
Likes: 0
From: S/E Kent, Thanet
Default

Originally Posted by Alan s1
Originally Posted by fiesta cossie
As said,

Might need to make a 1 off gasket out of thin gauge ally or copper, and put abit of good sealant on it around the injector cut outs.
That rings a bell

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mk3ste
Restorations, Rebuilds & Projects.
19
17-10-2021 10:09 AM
TPM961
Restorations, Rebuilds & Projects.
19
15-01-2018 10:50 AM
nicodinho
Ford Non RS / XR / ST parts for sale.
6
07-10-2015 12:56 PM
mondeomark
Cars & Parts Wanted.
0
28-09-2015 06:28 AM
sridgett
General Car Related Discussion.
13
27-09-2015 06:03 PM



Quick Reply: MKIII XR2i CVH & MkII XR2 CVH Head/Engine Compatibilty??



All times are GMT. The time now is 12:29 PM.