Dear COUPE-lovers.
I live in Belgium and i'm running a green 20VT coupe for almost 6 years. After a year the turbo was used and i replaced it with a GT2860RS and made a FMIC conversion and an APEXI boost controller. I always ran it with 1,2 bar boost.Performance was great and i never had any problems with it.I have now 183000km on the tacho.
But now comes the problem: it seems like the engine consumed a lot of oil in the last 1000km and i broke the engine. °((the conrod of cil 1 and the main bearings next to cil.1),and the piston has touched the cyl.head slightly.
Is it possible to use a 2.4 STILO-engineblock ?
I know it doesn't have the oil feed for the turbo, but this can be solved. My only concern is the height of the block.
I found someone who has a forged stilo block modified for turbo conversion, and it's tempting to buy it.
Can i use this block together with my original cylinder head? And what gasket do i need,cause it looks like the cooling jackets are a bit different around the cylinders.
I'm not interested to get more than 350 hp. But i want to have it more driveable in the low revs.I really love this car and it's always giving me a smile on my face when i throttle it.I hope there are some people who can help me with this.I see a lot of 2.4 conversions on the original 2.0 block, but never on the original Stilo-block.
Greets

Hello Bart!

I don't know too much about the stilo block but I will try to help.

You can use the stilo block and plumb an oil way for the turbo.
It will fit fine and I *think* you can use the coupe head.

But to be on the safe side, I would say use the the silo head and new vales to deal with te heat ect I.e sodium valves or better.

If you hit want 350bhp, then you may be better off staying with the 2L engine.

I know that all the 2.4 and 2.5L coupes use the stilo block so it's not a problem!!

Marco

pretty sure its not the stilo block that is used marco, is it not just the crank but custom rods and pistons but in the original 20vt block

the best person to speak to about these conversions is Barbz or John_S

give one of these guys a pm Bart, not sure if John_S is still on the forum so i would pm Barbz as he is the pioneer of these

good luck, be good to see another 2.4 and i did consider doing this conversion with the gt28rs turbo as i love low and mid range torque

cheers

You know the first words you'd mutter after flooring it in a 2.4? Cowabunga!

Mine is running standard 20vt 2.0 block, Stilo Abarth 2.4 crank along with custom rods and pistons

Thanks for the answers
It seems like the STILO block is 7mm higher than the 2.0.
So maybe i will have to reweld the downpipe slightly.
Are the crankshafts still original(concerning hardness)that you use on your 2.4 conversions?
greets

Someone I know is using a stilo block.
Don't you lot read Autoitalia

Lots of alterations required to oil ways,brackets exhaust etc etc etc.
Also the compression ratios are different as are the squish angle and volume.

And that's not half the issues you'll face so unless your experienced or buy the platform from someone whose used this engine before then stick with the 2.0.

John.s ran a 2.0 and mavric ran a 2.0 with a 2.4 crank with custom pistons and rods.

Only people to use stilo engine is me and Barbz.
That said Barbz has got some secret project in the pipeline so not sure if that involves a further transplant.

I am using a stilo block as well - the only advantage beyond the 2l-block is this 7mm more height. Therefore you can use longer, means stronger pistons.
This becomes relevant from engine power about 600HP...
Juergen

Ok thanks ,so there are still a lot of issues to solve before using this block.

Not necessarily. Strokers can never rev is well as short stroke engines, and some turbos need to be revved to make the power.

Compare my car(2.0) to Barbz's(2.4). After 7000rpm his power starts to tail off where as mine goes right up to the 8250rpm limit and is still climbing. Totally depends what setup you're going for.

A big turbo will need more energy from the exhaust than a smaller unit. Therefore a bigger engine like 2,4l, which will deliver more exhaust in lower revs, will improve start up behaviour of these big turbos.
A short stroker will need more speed to get the same amount of exhaust like the 2,4l. Moreover the 2,4l has better geometric characteristics - a longer lever - which will affect in a better response in lower revs as well.
Disadvantage of a long-stroke 2,4l: at high revs your engine has not enough time to fill the big looong pots with enough air, any more. Now the cylinder charge becomes worse in direct comparison with a shorter 2l.
Therefore it is very very important for a long strok engine to have a very efficient cylinder head - still more than for a short 2l.
For example - the 16V Turbo engine has about the same stroke like the 2,4l engine - about 90mm.
And there are a lot of 16V Turbo engines, which rev about 8000rpm or even more.
8250rpm with hydraulic valve lifters is an absurdity anyway. Do you have a mod to meachanical valve lift?!
I modified my hydraulic valve lifters to get more revs out of it... we will see, what they can do - with 2,4l.
Back to the pistons - the 2,4l pistons become very short in a 2l block - therefore they won't do the torque which is needed to get >600HP. Thus you will need 560NM to get 600HP with 7500rpm... Very very much, maybe too much for a short 2,4l piston for 2l block. The additional 7mm from the higher Stilo block may help here to get a stronger piston design!
Juergen

isnt that the whole point - who can rev their car like that on the road? And having had race engines in my kappa, one like yours with power still climbing at 8000, and another built as a torque monster, I know which is quicker on track too

Hence the building of a 2.4 set for low pickup over high revs, but with solid lifter conversion in case I need to rev out rather than change gear

Me.

Is it finished yet?

Bart, would be nice to meet up one day! You're pretty close.

Yes ,it looks to be pretty close.
Do you have experience with these engines?
Maybe we can meet.

Alas the legal issues drag on - I'll PM you