Boring out an '86 2.5 gtv6

[AlfaTango1]

I see you arr in Berkley. Is this going to be a street car or track car? With the SC it won't pass California emissions.

[as-of-now]

Quote:

Originally Posted by AlfaTango1 I see you arr in Berkley. Is this going to be a street car or track car? With the SC it won't pass California emissions.

[SimonDB]

Although the 24V V6 is based on the 12V one, I do not think it is possible to put the 24V heads on a 12V block. You would need to find a complete 24V engine. The 164 24V is the easiest because Alfa had less time to make changes and adapt it to being transverse and FWD. People have fitted later 24V motors but things get more complicated. There is loads of stuff about this on the GTV6 forum. People in South Africa have fitted the 3.2 from the 156/147 GTA as well as monster 3.7 versions of this engine. Money wise it depends where you are and what is available, it might be worth buying a built up engine from South Africa for example but then there is transport, customs etc and you still have to get it fitted. The 2.5 is a lovely engine, its just not one of the quickest things on the road anymore (25-30 years on!). Supercharger wise, I think its designed to come on and off in couple of hours for emissions tests! As far as actual emissions are concerned, it shouldn't affect them if the injection is set up right.

[Gabor K.]

Also things to be taken into consideration, costwise, is that you cannot put a supercharger on an old engine without overhaul of the engine first! Depending on the general state of the engine one must calculate additional cost for this in the project. Changing parts not up to spec. could easily double the price of the project!

[mjr]

Well thats not a rule of thumb though is it. it purely depends on mileage. If the engine is relatively low mileage, 60k 70k, and its healthy, there is no reason at all you can't just bolt on the SC. remember we are talking 7-10psi for a reasonable 220-230hp on the 2.5, which a healthy motor is more than up to, with the stock rev limiter left in place.

[AlfaTango1]

Quote:

Originally Posted by SimonDB 0 years on!). Supercharger wise, I think its designed to come on and off in couple of hours for emissions tests! As far as actual emissions are concerned, it shouldn't affect them if the injection is set up right.

[as-of-now]

Quote:

Originally Posted by mjr Well thats not a rule of thumb though is it. it purely depends on mileage. If the engine is relatively low mileage, 60k 70k, and its healthy, there is no reason at all you can't just bolt on the SC. remember we are talking 7-10psi for a reasonable 220-230hp on the 2.5, which a healthy motor is more than up to, with the stock rev limiter left in place.

[as-of-now]

I don't think I mentioned this, but in addition to the $3100 kit, what else would I need to buy?

I see water injection, a connecting rod kit, forced induction non interference pistons, and supercharger crankshaft pulleys. these all look like great items, but it would bump up the cost of my project by quite a bit.

I am confused as to what is actually necessary for the setup I want to run (MP62 @10-12 lb of boost). I know I say that I want a reliable machine, and I can only assume that buying the extra parts (and maybe more) would improve the reliability of my GTV6, but at the end of the day, I need to be realistic here as to what I set myself up for spending.

Any idiot can probably assume this, but I'm no mechanic. Thanks for bearing with me.

[AlfaTango1]

For ease of use and reliability I'd go with a 3.0 from a 164L. They are easy to find and cheap and for the most part even the intake runners would pass at most smog stations. You could always use the regular GTV6 plenum. You would be amazed at what an extra 30 hp does to a 2800 lb car. If you could find an S engine great or you could spend some money on S cams or GTA cams and probably still make budget.

[Gabor K.]

These engines are now 22-28 years now, so even they had no mileage O-ring and gasket change would be due. It would be at bit of a gambling just to install a kit relying on low mileage. Just for your info companies in germany doing turbo conversions would demand that the car had less than 60.000km(37.300mls)! to give any guarantee for the job, and that is for much newer cars than this one. 75.000 mls(120.000km) would be out of the question without overhaul and repacking the engine. Well, that depends on how much one likes to gamble.

[as-of-now]

Quote:

Originally Posted by AlfaTango1 For ease of use and reliability I'd go with a 3.0 from a 164L. They are easy to find and cheap and for the most part even the intake runners would pass at most smog stations. You could always use the regular GTV6 plenum. You would be amazed at what an extra 30 hp does to a 2800 lb car. If you could find an S engine great or you could spend some money on S cams or GTA cams and probably still make budget.

[AlfaTango1]

An S or L engine is not a very complicated swap, now a 24V is. You can even run the original L Jet engine management system with no issues. My L has 149,000 on it and it pulls like a train, my S had about the same. There are many L's lying around that you could pick up in California with strong engines. The Alfa 3.0 is very robust. I still have to say this is the best way to go since the blower will get rejected the first time you go to get it smogged. Well you could always register it in a state that doesn't have these issues and take the chance that way

[as-of-now]

Quote:

Originally Posted by AlfaTango1 An S or L engine is not a very complicated swap, now a 24V is. You can even run the original L Jet engine management system with no issues. My L has 149,000 on it and it pulls like a train, my S had about the same. There are many L's lying around that you could pick up in California with strong engines. The Alfa 3.0 is very robust. I still have to say this is the best way to go since the blower will get rejected the first time you go to get it smogged. Well you could always register it in a state that doesn't have these issues and take the chance that way

[mjr]

Do yourself a favour, an email greg or ring him at the shop, you will get a million opinions on this forum, So talk to greg and get the facts from the horses mouth, then you can make a well informed decision, as to whether you want to boost, or go the 3.0 non boosted route.

[AlfaTango1]

Transverse or longitudinal it's still just an Alfa V6 with two heads on each side and a flywheel in back (or side in an fwd car). If you took the GTV6 or Milano intake plenum and swapped it with the 164 runners you could not tell the difference.