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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!!
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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
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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
Bad planning on your part does not make your issue an crisis to me
Bad workmanship by other garages does not entiltle you to better rates at me
Syncro, syncro , syncro and more syncro, this is the syncro way of life
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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
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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.
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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.
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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
Bad planning on your part does not make your issue an crisis to me
Bad workmanship by other garages does not entiltle you to better rates at me
Syncro, syncro , syncro and more syncro, this is the syncro way of life
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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
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07-07-2018, 11:20 AM (This post was last modified: 07-07-2018 11:54 AM by monkslayer.)
Post: #9
RE: 20v head on 2.5i Engine?
Finally managed to semi compelte Audi 7A engine. After getting some advise from the motorgeek forum in the states, decided against implanting the head on the SA block and used the Audi 7A block, all the internals and head as is. In order to use the 92.8mm 2.5i SA crank,I had to get golf 2.0 16V pistons and unfortunately the merchant sold me a mix and match of 4 83mm and 1 82.5 piston.This meant having to source a 83mm piston to make a set of 5 as no second hand ones can be found. I had to fork a steep penny to settle it.:-(.

As it is, this where i am now: Audi 2511ccm,5 cylinder 20V..

[img][Image: 43203798152_ea21fd8ece_b.jpg]
IMG-20180707-WA0021 by MONK, on Flickr[/img]

[img][Image: 29382416838_bc6dbc38e3_b.jpg]
IMG-20180707-WA0020 by MONK, on Flickr[/img]

[img][Image: 43203798532_ac7fd165fe_b.jpg]
IMG-20180707-WA0019 by MONK, on Flickr[/img]


Next project in line is to setup a harness for the coil pack conversion(Will be using the Audi 2.0TFSI coil packs), install a 60-2 trigger wheel and sensor to go along with it.I plan to eliminate the dizzy completely if i can. Not sure if there is any performance gain to be honest, maybe just smoother idle and power delivery i would imagine. Any advise for those who have done this before would really be appreciated. Definitely my first rodeo but really excited. However, just when i am just about to finalize the 5 cylinder, this drops on my doorstep at a steal of a price:

[img][Image: 43252384531_5895b50500_b.jpg]
IMG-20180707-WA0016 by MONK, on Flickr[/img]

Couldn't pass it up, because you don't get these engines at these prices in my part of the world. Audi 2.8 V6 30v(APR code), complete with harness, instrument cluster , ignition and key. Now , I'm in a dilemma on whether to continue with the 5 cylinder 20V install or to ditch it and swap it for the Audi V6!!life can be cruel at times!Confused.

What do you guys think, if you had to choose between the 2.5L 5 cylinder 20V or the 2.8 v6 30V, which would you pick?
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07-09-2018, 08:38 AM
Post: #10
RE: 20v head on 2.5i Engine?
IMHO the 2.5 5cyl is a better choice,

I may be a mechanic, but i can't fix stupid
Bad planning on your part does not make your issue an crisis to me
Bad workmanship by other garages does not entiltle you to better rates at me
Syncro, syncro , syncro and more syncro, this is the syncro way of life
Visit this user's website Find all posts by this user
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