2V heads are out. Now what?? Need advise please.

Its vitually impossible.

 

12:1 compression

 

If you do approach the magic 300 number someday, be careful of something a lot of 308 modders overlook --- the transmission.

The stock transfer case on the 308 isn't really up to the task. The problem is that the gear shafts are cantilevered, and under the higher forces applied by the extra ponies, they deflect too much causing the gears to mesh improperly and then fail. The increased thrust loads on the shafts / bearings (the gears are Helical) are also problematic. The (270HP) 328 transfer went to an improved, much stronger configuration in which the outboard ends of the shafts are supported by an additional set of bearings and thrust washers in the case cover.

This lessen learned came to me from the folks at Carobu, who discovered this weakness directly --- I'm not sure at what power level this occurs as those guys have taken 308 engines way north of 300HP!

You may wish to give them a ring to see what they feel is a safe power limit for the stock 308 transfer. Or, perhaps if someone at their shop belongs to this board, maybe they will chime in.

Oh yeah, before a bunch people start arguing with me ---- take it up with the experts at Carobu --- I'm just relaying what they told me.

 

Well, keep in mind the folks at Ferrari saw fit to change the design at only the 260/270 HP (stock 328 engine) mark --- it's not too difficult to get a 2V 308 engine up to that level...

Dump your emissions stuff, slip in 10.5:1 pistons, EFI, modern ignition electronics with hot maps, and you'll be right in there!

 

That is probably right for track use, but for street use it doesn't seem to be a problem. I ran about 15k miles at about 360 hp then another 5k at 500+ with mo hint of a problem. We'll see how it deals with 600+ when I finish the new engine.

 

HP I have no idea; for speed around corners I suggest driving lessons. Best $2k investment you can make.

Ken

 

Nitrous . .. you'll get the number you're looking for .. . you didn't specify how long .

Your engine management will make it a piece of cake.

 

Mark ---

Agreed.

It certainly is also very dependent on how hard one is driving the car, to be sure.

 

Best to save your 2 Grand and do research first. I would talk to guys like Nick's Forza (www.nicksforzaferrari.com) or other "speed shops" before deciding on something. I saw a thread somewhere here that states a port & polish job was anywhere from $1,500-$2,000, you might want to (use the search engine) check these out. I doubt you'd get 300+Hp's out of it but its a good start (I think). Good luck man!

 

4th & 5th are the weak parts . .. that's why no one sees problems unless they track . . . really track that is . . . not to be confused with "I drove on a track" .

 

If you really only have 2k the research will probably convince you to go buy a Vette

I assume you're doing all the work yourself . . I thought I was optimistic about cost

 

Here's a nice 5th gear failure Since it's a 308 gearbox doubt it was from too much power . .. engine probably seized/cam belts broke humming down the freeway to do something like this yes?

 

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Probably camshafts and careful tuning.

 

This doesn't answer your question directly but if my budget were $2000 I would look for very light weight (but strong) wheels. They would improve acceleration, braking, handling, improve mpg a tiny bit etc. and would not add any stress to the engine. Completely reversable too if you decide to sell it without them. Of course the problem is you might like the style of the originals and there may be little or no selection of such wheels.... never looked into it. I think that is the best bang for the Buck but only if they are quite a bit lighter.

 

You are going to get some mixed opinions about P6 cams in an otherwise stock engine. They work with cars, but barely from what I've read. With EFI you can get away with a lot more and it will probably drive just fine and make 260-270hp, but the low end will be softer than stock unless you increase the compression ratio.

On an otherwise stock engien you would be better off with the early car cams I think. You won't make quite as much peak hp, but the will end up with more power in the low-mid range where you drive most of the time.

Porting is always good....but a good porting job will be a lot more like $5k+ than $2k and would work best with a cam change to match (the early carb cams again would be my choice).

 

Seems to me you are going to burn up better than half of your budget on gaskets, bearings and fluids before you even start to look at mods. I think it is an unrealistic number to start with and at that budget you should focus on reliabilty / maintaince concerns.

There is a wonderfully warm feeling about reving the crud out of an engine when you KNOW everything is in proper order. I suggest you step back and look at it from this direction. Pull the bottom end apart, inspect everything and freshen that. With the bottom end in order you can build the top when you have more of a budget to do so. There are few 2V virgins left, I know as I am there with my own car and what I found in the bottom end far exceeds the budget you have set.

Dave

 

http://www.ferrarichat.com/forum/showthread.php?t=187421