Alfa 2.7 v6 turbo.... crazy idea or not?

Post Reply
User avatar
Luis
Gold
Gold
Posts: 99
Joined: Mon Apr 04, 2005 5:57 am
Location: A Coruña, Galiza, Spain

Alfa 2.7 v6 turbo.... crazy idea or not?

Post by Luis » Thu May 31, 2007 5:25 am

We know the 2.8 conversions mixing 2.5 and 3.0 v6 engine parts.

But, what about mixing 2.0 v6 turbo and 3.0 v6 engine parts?

3.0 is 93mm * 72.60

2.0 is 80mm * 66.20

So 2.7 must be 93 * 66.20

I have to search for 2.0 v6 turbo at junkyards....
User avatar
SimonB
Gold
Gold
Posts: 188
Joined: Sat Dec 11, 2004 3:02 pm
Location: Cambridge, UK
Contact:

Post by SimonB » Thu May 31, 2007 7:10 am

There is a guy parting one out just over the border in Portugal! See www.alfanord.pt

It is listed on the homepage.
¡Si me gusta conducir, es porque conduzco un Alfa!

'84 GTV6 UK spec back on the road after 4 years!
05 Corolla daily driver
User avatar
Mats
Verde
Verde
Posts: 4059
Joined: Mon Nov 29, 2004 12:26 am
Location: Gothenburg, Sweden
Contact:

Post by Mats » Thu May 31, 2007 7:12 am

Why do you want to make the extremely short stroke 3.0 even shorter in strroke? The limiting factor is the exhaust rocker in the head so there is no use giving up 10% displacement IMO.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-

GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
User avatar
Micke
Verde
Verde
Posts: 810
Joined: Sun Dec 05, 2004 11:33 pm
Location: Finland
Contact:

Post by Micke » Thu May 31, 2007 10:38 am

To stirr the soup I'd continue on Mats' mumbling and tell you to put 24V heads on it. 10 krpm rules :twisted:
User avatar
Mats
Verde
Verde
Posts: 4059
Joined: Mon Nov 29, 2004 12:26 am
Location: Gothenburg, Sweden
Contact:

Post by Mats » Thu May 31, 2007 10:57 am

I bet the 24v can rev 10k with stock geomery, just buy expensive parts and it will work.
Then you also need to update the whole driveline, perfect. :)
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-

GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
User avatar
GTV6GPTT
Gold
Gold
Posts: 105
Joined: Wed Dec 22, 2004 7:02 pm
Location: Melbourne
Contact:

Post by GTV6GPTT » Fri Jun 01, 2007 9:20 am

do you think wasting the time to go from a 2.5 to a 2.7 when you are talking turbos is really worth it in price? im sure a few extra psi and the rigth comp will be alot easier.
Greg Gordon
Verde
Verde
Posts: 1552
Joined: Mon Nov 29, 2004 7:06 pm

Post by Greg Gordon » Fri Jun 01, 2007 10:22 am

I agree. It's a lot easier and less expensive to get more power via more boost, cooler intake air temps etc.
kens
Silver
Silver
Posts: 19
Joined: Thu Dec 21, 2006 3:05 pm
Location: Texas

Re: Alfa 2.7 v6 turbo.... crazy idea or not?

Post by kens » Mon Mar 07, 2011 12:58 pm

I got this very same crazy 2.7 idea! My 164 Super 2.0 V6 TB threw a rod. Throwing rods should be expected when you let a teen drive a high mileage turbo car and they opt for 6500+ rpm on a long straight highway.

The damage included a horse shoe like rod, one fully destroyed piston and broken skirts on a second piston. For the price of a new rod and two pistons/liners, I could have purchased a very nice used 2.0 V6 replacement engine.

At some point it struck me that I could merge the broken 2.0 turbo V6 with my 40k mile 3.0 block with pistons. The build objective was simply to test this low budget modification. The 2.7 build substituted the 2.0 crank into the 3.0 block. The 3.0 block was dated 1992 and had all surfaces for mounting the turbo bracket and knock sensors, oil filter housing. Drill, tap and mount. Engine simulation software suggested that using the 2.0 heads would not be a huge disadvantage. I rolled the dice by choosing not to have the engine balanced. The 2.0 and 3.0 flywheels weigh the same. Yet, visually the hollowed balance section is much different. I opted for the 3.0 flywheel.

2.7 V6 turbo details:
Squadra Tuning 2.0 chip set
uprated injectors
Heads refreshed with new guides, seals and springs
3.0 flywheel

The car has been on the road for about a month with very good results. The car was expected to be rather rough running due to the chance merge of Squadra Tuning 2.0 maps and larger injectors. However, driving is quite smooth and very enjoyable. Unfortunately, the large increase in power is matched by fuel consumption. Previously the fuel consumption of 21 MPG is now about 16 MPG US, about 15L/100km.

Ken
grant
Platinum
Platinum
Posts: 304
Joined: Sat Nov 25, 2006 9:14 pm
Location: San Jose, California
Contact:

Re: Alfa 2.7 v6 turbo.... crazy idea or not?

Post by grant » Thu Mar 24, 2011 11:31 am

Unless Squadra specifically mapped that ecu for your unique engine, the high fuel consumption is probably because of the larger injectors you installed.

The narrowband o2 sensor can only pull so much fuel at cruise and around town..
BMW's are the ultimate driving machine!




I'm kidding -- please don't ban me.
la_strega_nera
Platinum
Platinum
Posts: 494
Joined: Tue Feb 21, 2006 10:05 pm
Location: Sunny Euro-Brisney

Re: Alfa 2.7 v6 turbo.... crazy idea or not?

Post by la_strega_nera » Wed Apr 20, 2011 9:40 pm

Some calculations I did show a hybrid built from a 9.5:1 3l with a 2.5l crank drops the compression off to 8:5 compression...
1966 GTV
1982 Suzuki "Bathurst" Katana
1995 Cagiva Mito (race kitted 250 powered)
User avatar
Giuliettaevo2
Verde
Verde
Posts: 776
Joined: Sun May 08, 2005 11:56 pm
Location: Netherlands

Re: Alfa 2.7 v6 turbo.... crazy idea or not?

Post by Giuliettaevo2 » Thu Apr 21, 2011 9:27 am

Squadra build a 2.8 Tb Spider 916.

It has the Spider 3.0 12v engine with a 2.5 crank. compression drops from 10:1 to 7.7:1.

330bhp and 420+ Nm is not too bad for a 12v i guess. :twisted:

In the link above you can read more about it in Dutch... Google translate is your friend. :wink:
Drive it like you stole it...
Post Reply