Hello..

I have secound engine for coupe 20VT, and I think about 2.4 conversion.. What I have to modify in my standard engine ? Project for 350HP with GT28RS turbo..

I known.. I will need:
- 2.4 stilo/kappa crank
- forged rods: where can I get it ?
- forged pistons: 2.0 or 2.4 ?
- block is standard 2.0 or 2.4 ?

Help me please, we do not have 2.4 coop in Poland yet..

PM JohnS for details on the 2.4
He may refer you to Barbz but it's worth checking out on the pistons and rods. You should be able to use the same block.

Don't forget that you'll have to pay for a standalone ECU and mapping. i.e. MoTeC.

i have all you need

also complette engine

I am looking for forged rods for 20vt 2.0, I cant see any products under ebay Nitrous?

Why not buy the short block JohnS is selling in the for sale section? Complete with pistons, rods, crank for £3.5k. I dare say that's cheaper than it'd work out to for the parts alone.

Mariusz.

I've almost finish my 2.4l conversion (first in Russia). The only necessery parts you need are:
1) 2,4l (Kappa or Stilo) crank
2) Forged pistons (to lower CR)
3) 2,4l (shorter) rods. It's absolutely unnecessery to use forged rods. You need forged rods only if you plan to raise RPM limiter to 7500 or higher. Otherwise stock rods will easily handle 500hp. We've checked this MANY times on different Fiat and Lancia twincam engines.
4) Oil sump (it's more "deep" then stock 20VT)


I was fccuking lucky to buy mint Kappa 2,4l engine here in Moscow (can't believe it myself), almost perfect condition. So conversion cost me about 700 bucks ))))))))

BTW, stock cylinderhead of this engine has bigger valves (33.5 inlet, 28 exhaust), so you can use it without paying money for Stage 3,4 or whatever. Porting and polish easy to do yourself, and 3angle seats do not give much on Turbo motor.

The only problem is mapping. I use russian sport ECU called Korvet (it cost about $300), everything work perfectly!

So, stroking to 2.4 - is not so difficult.


Good luck!

OMG, ECU for $300??!! Where, where?!

BTW Well done mate. That's the sort of stuff I like to see.

Hi Michael,

Do you have any pictures of this Monstro ?

So you have changed the complete engine on your Coupé, or did you only change the parts you listed?

Did you also change the Cylinder head?

Have you changed camshafts?

Have you changed injectors?

Is there any english manual for the russian sport ECU called Korvet?



Mariusz: Good luck with the conversion

I will make pictures of the engine on this weekend.

I will swap the hole engine, now the motor is finished and is on "cold running in" on a special stand. Before puting it in the car I will measure torque and hp on flywheel.

But shortblock itself seems to be the same on 2,4 and 2,0

I used cylinder head from this Kappa engine. It has bigger valves (33,5 inlet, 28 exhust), also I did porting and polish exhust channels.

I am trying to make tubular manifold now, but yet - no results...

I've made also "non full-based" camshafts from my srock 20VT cams. I've raised lift on 1 mm, and phases are 280 / 260 (in / out). Fiat cams have very tough "working surface", so you can remove some metall from the surface without any risk. My friend's Delta (engine like on Coupe 16VT) did 50k already on such cams - perfect!

I use now stock injectors with 4,5 bar of fuel pressure, but I think I will cnange them to Siemens Deka 440cc.


About the ECU:

here's the web-site of the company: Korvet site

They have no english version, but you can try babelfish.

This ECU is very simple and very reliable. The later model (it cost about 450$) even support ANY kind of injection (water, metanol, NOS), antilag etc... You only need special driver to maintain 5 cylinders. And this ECU is absolutely must have on 16VT (we have 700hp Lancia Delta running on it)

We use "Tuner Pro" soft, and you also have to change some sensors on the engine (AFM, temperature, RPM). But for MUCH chiper one )))

2) Do you use 2 liter Turbo pistons?

4) Do you use Stilo sump?

1) I use custom forged pistons (CR is 8.8/1)
2) I use Kappa 2,4l sump (I think it's the same as Stilo's)

Which flywheel do you use MichaelZ?

Now I have Kappa's flywheel installed. I've lightened it a bit and balanced together with the crank. But I plan to use Alfa 164 Q4's clutch, so maybe I'll have to change the flywheel. I think I will have some other problems when fitting the engine on the car. Sump form is a bit different, so maybe I'll have to remove or weld a part of the front bridge.

i dont know where ive read it but is it true about the alfa 156 2.4 crank fitting, ive probly read it wrong but recon cranks shouldnt be that expencive

Michael, nice project!
Are you using the Integrale gearbox or what? Does that fit with the 5-cyl?

I think Fiat never used 5 cyl engines on 156. 156 2,4 is V6, isn't it?

The only Fiat cars with same 5 cyl shortblock are: Coupe, Lancia Kappa, Fiat Stilo...

Yes, I use Alfa Q4 gearbox, but with Evo "main pare", strengthned synchros and visco drive (another gel). I also havу custom front anti roll, but not sure yet if it will fit coupe without changes...

I was Fccuking surprised when I saw that my 6-gear box from LE has special "window" for 4wd distributing box!!! But the form of gearbox allows to fit Alfa or Grale box to 5 сyl. You only have to weld a bit the sump.

I'm not sure yet about the clutch, will it fit, or maybe I have to switch to Alfa 164Q4 (to do so you have to cut stock 20Vt Flywheel (make "working surface" wider, that also helps to raise pushing strength of the clutch).

I see, the Dedra Intergale/Alfa Q4 box then.
The 2.4 5-cyl was used in diesel form in Alfas!

so that would be a cheaper route if people wanted to go 2.4l by buying a alfa engine for the crank then change everythink over to the fiat block

the Kappa/stilo 2.4 blocks are not the same height as the 20VT blocks. I cannot remember the difference in height but it is about 9mm. So if you swap all the parts into a 20VT block you will get an engine with about 30:1 compression ratio
I don't know about the 2.4 JTD block and its suitability but the crank is different to the 2.4 stilo (and there are two revisions of the stilo crank)

Yes, blocks heights are not the same.

So you should use shorter rods and lower pistons to gain necessery CR.

thats what i ment use the jtd crank from the alfa but change the rods and pistons that should give you the bases for the 2.4l

MichaelZ:
Are the Kappa valves suited for turbocharging?

No they are not...

Do you mean materials of the valves?

I think you can use stock inlet valves, but better to use custom exhaust valves, as they suffer more pressure...

I have used cylinder head, it was in medium condition, so I've changed all valves (exhaust are now from titan) and guides and tappets etc...

JohnS - did you really ever TRIED stock valves on turbo? Because of cause it's always simple to change every part and pay 4000 pounds for the engine.


We have here two stock n/a 20V coupes, that was turbocharged without any changes in Head (except cams, they were filed to have bigger lift). All other parts are stock. One of these coupes run 60000km (40000miles) already, and not long ago we changed timing belt - the head is in perfect condition - no signes of tear and wear at all.

20vt valves are sodium filled to handle the extra heat, the n/a vales aren't so I doubt they will last ?

Yes, it's official explanation. But I've seen with my own eyes TWO n/a coupes with turbos (pressure is 1,2-1,4) with stock n/a valves - they're running great with no problems.

Only time can decide that one Michael, tuned coupes with sodium cooled valves have still been burnt away over time. I doubt the standard valves will last.

ask rob40, he has one.. might see it today at the rolling road, am hoping for over 280bhp.

There is usually a reason Fiat fits certain parts costing extra. As sodiumfilled valves.