3.0 SC - can it be rebuilt to 3.4?
 

Can this be done with P/Cs and ? If so, can it be done and still pass CA smog cert.? Will existing CIS still work?

Thinking ahead and wondering, if it's possible, would it be a lot less work/$ than a 3.2 or 3.6 upgrade? Is Mahle the only brand to consider?

It can certainly be done.

3.2, 3.3, and 3.4L are all possible configurations wtih 98, 100, and 102mm pistons respectively. LNEngineering makes some great stuff, and is what I used on my racecar. Based on the weight and the quality, they work perfectly with J&E pistons to get any compression ratio you want as well.

Induction is another story though... I don't do a lot of work with CIS, so hopefully someone else can answer

You will need a 3.2 crank/rods and some compatible 98mm pistons. CIS could be used if you choose the right cam and corresponding pistons. If you are going to go to that much trouble to build a 3.4 I would personally not use CIS.

SEarch for posts on rdanes 3.4. He did it with CIS.

The smog jockeys won't know if you increased displacement. They may know if you changed induction. They likely wouldn't know if you put a 3.2 in your car or even a 3.6, as long as it looked factory and the tailpipe was clean (IE you ran a cat).

I don't know what crank and bore combination = 3.4. I know the 3.0 rods are the same size (crank end) as the new GT3 stuff.

You could probably find someone to build you a great engine and then do the swap out in a relatively short time, if you didn't want yours to be down for too long.

Another option is to keep your engine just for smogging and make the new engine simply bolt in. $500 to $1k to R&R every two years isn't too bad to pass smog.

Doug

3.2L crank plus the 98mm piston/cylinder combination for the 74mm stroke. 100mm pistons will net 3.5L

Thanks, all.

I stopped by my mech. who said yeah, but the CIS wouldn't handle it very well, so I'm going to take Doug's advice and leave mine as it is.

I just have to somehow get over the sound & fury of Doug's RSR clone
(you sure didn't make things easier for me after you gave me a ride in that beast of yours, Doug:)! - thanks - unforgetable).

You guys on this board are sure nice to us newbies.

I know it might sound crazy for a newbie, but you've obviously had some car experience. Dropping a Porsche engine is only surpassed by a VW ( because it weighs nothing). You can easily drop a 911 engine faster than getting the B series out of your GT. If you have as many cars as I and it looks as you do, then you can certainly find room for another boxster engine :)

What I'm getting at is the idea of of two engines is not that far fetched. You keep the CIS engine (core value of $3k) and build up what you want for the other 729 days between biannual checks. Sounds funny, but I find the most tedious thing in dropping an engine is the darn CV bolts :D

54 Healey.........things we dream about with the screen down and some serious B road activity. Welcome

haha dont you think swapping engines to pass smog is a little extreme! Why not just get to be buddies with a mechanic. Or just ask other porsche or hot rod guys if they know anybody that sells lick em and stick em's

Great idea, Luke! But I don't turn wrenches or drop engines - only washers and screws (after I've cross threaded them), always into unreachable regions.

I miss that old Healey, and the bugeye, both of which I drove with the tops down, the screen layed down (removed altogether on the Sprite) thru several N.E. Ohio winters, often in the dead of night (with the Sprite's muffler removed - woke up lots of sleeping cows on them B roads).

You being in Terre Haute, with similar brutal winters, need I say more about youthful fanatic sports car exuberance:)?

Thanks again for all the input - maybe one day I'll bite the bullet and end up with a screamin Porsche hot rod.

3.4 CIS done right will give any stock 3.6 a run. BTDT.