Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
20v head on 2.5i Engine?
08-31-2017, 03:28 PM
Post: #1
20v head on 2.5i Engine?
Hey guys,

Has anyone installed the Audi 7a 20v head and swapped it on their 2.5i engine in the SA microbus? I have the original 2.5 5 cylinder engine with the 10v head. I recently upgraded from the CIS to EFI with an aftermarket ECU. It would be interesting to know if it is possible to replace my 10v head with a 20v one and if so what else i need to do ! pics would be additionally helpful for those who have done it!!
Find all posts by this user
Quote this message in a reply
08-31-2017, 09:01 PM
Post: #2
RE: 20v head on 2.5i Engine?
(08-31-2017 03:28 PM)monkslayer Wrote:  Hey guys,

Has anyone installed the Audi 7a 20v head and swapped it on their 2.5i engine in the SA microbus? I have the original 2.5 5 cylinder engine with the 10v head. I recently upgraded from the CIS to EFI with an aftermarket ECU. It would be interesting to know if it is possible to replace my 10v head with a 20v one and if so what else i need to do ! pics would be additionally helpful for those who have done it!!

I got 2.6 20v turbo setup in my Syncro. You must use a RS2 head gasket and pocket the pistons. oil to air oilcooler
Find all posts by this user
Quote this message in a reply
09-01-2017, 01:22 PM
Post: #3
RE: 20v head on 2.5i Engine?
(08-31-2017 03:28 PM)monkslayer Wrote:  Hey guys,

Has anyone installed the Audi 7a 20v head and swapped it on their 2.5i engine in the SA microbus? I have the original 2.5 5 cylinder engine with the 10v head. I recently upgraded from the CIS to EFI with an aftermarket ECU. It would be interesting to know if it is possible to replace my 10v head with a 20v one and if so what else i need to do ! pics would be additionally helpful for those who have done it!!

we fitted a full 7A motor with Vw mp9 to a syncro runs great
125kw, 2.3i

I may be a mechanic, but i can't fix stupid
Syncro, syncro , syncro and more syncro, this is the syncro way of life
Visit this user's website Find all posts by this user
Quote this message in a reply
09-01-2017, 01:44 PM (This post was last modified: 09-01-2017 04:04 PM by monkslayer.)
Post: #4
RE: 20v head on 2.5i Engine?
When you mean pocket the pistons, i presume you mean use the RS2 pistons? Also in addition, I have read in other swaps that one needs to use the overbored VW 9A pistons(83mm) and also corresponding 144mm rods. I figure this is the same design as the RS2, is it? Sorry for the noob questions, newbie here, just making sure i have my bases covered! P.s: I am looking at a NA motor not turbo'd.

Guys who have done the swap, part numbers would be appreciated and pictures too!

Also looking for a 20V head and accessories ..

Cheers

(08-31-2017 09:01 PM)Mobilesolarpower Wrote:  
(08-31-2017 03:28 PM)monkslayer Wrote:  Hey guys,

Has anyone installed the Audi 7a 20v head and swapped it on their 2.5i engine in the SA microbus? I have the original 2.5 5 cylinder engine with the 10v head. I recently upgraded from the CIS to EFI with an aftermarket ECU. It would be interesting to know if it is possible to replace my 10v head with a 20v one and if so what else i need to do ! pics would be additionally helpful for those who have done it!!

I got 2.6 20v turbo setup in my Syncro. You must use a RS2 head gasket and pocket the pistons. oil to air oilcooler
Find all posts by this user
Quote this message in a reply
09-04-2017, 04:18 PM
Post: #5
RE: 20v head on 2.5i Engine?
You must pocket the 2.5 pistons. The 20v N/A motor comes alive from around 4000rpm. So get new rod bolt.
Find all posts by this user
Quote this message in a reply
09-07-2017, 12:52 AM
Post: #6
RE: 20v head on 2.5i Engine?
Thank you for the heads up. I think it will be easier to get the forged 9A pistons or the audi/VW 2.0T FSI pistons and install them. Apparently the rods on the 2.5i ar already 144mm so I may have saved myself an expense on that, though ultimately i may just go forged on those depending on funds.

Now, just to source a complete 20v head!Confused

Cheers

(09-04-2017 04:18 PM)Mobilesolarpower Wrote:  You must pocket the 2.5 pistons. The 20v N/A motor comes alive from around 4000rpm. So get new rod bolt.
Find all posts by this user
Quote this message in a reply
09-07-2017, 07:52 AM
Post: #7
RE: 20v head on 2.5i Engine?
20 valve heads are HTF, luckily i have one and a 7a block with pistons etc, still need to decide what i am going to build with it, unless i get a good offer for it as is, then it can go

easiest i would say is to source a complete 7a motor, a few small external mods, new cambelt and seals, and its a straight fit

I may be a mechanic, but i can't fix stupid
Syncro, syncro , syncro and more syncro, this is the syncro way of life
Visit this user's website Find all posts by this user
Quote this message in a reply
09-07-2017, 03:06 PM (This post was last modified: 09-07-2017 03:07 PM by monkslayer.)
Post: #8
RE: 20v head on 2.5i Engine?
The 7a motor sounds enticing but i want to see if i can stick to using my current block which i had redone hardly 200kms ago. I guess I will PM you to see whether i can be convincing enough!
Tongue

(09-07-2017 07:52 AM)syncromad Wrote:  20 valve heads are HTF, luckily i have one and a 7a block with pistons etc, still need to decide what i am going to build with it, unless i get a good offer for it as is, then it can go

easiest i would say is to source a complete 7a motor, a few small external mods, new cambelt and seals, and its a straight fit
Find all posts by this user
Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)