s2 xxxhp 90% ready

[aronmatic2]

everybody said, impossible to change the old aircon system to the newer.
now its working perfect. almost everything was plug and play.
not a difficult thing.

[zlobo]

good work Aron

[aronmatic2]

here is one for the inside:

[Jamo]

Pics?

[aronmatic2]

the facelift in this month:
new dash
newer 2 windows aircondition system
we trying to give some fresh air to water radiator and air filter
new tranny kulisse(i broke)
new alternator
thats it for this month
pictures tomorrow

[aronmatic2]

the sparkplugs was fine braun-black.

[S4turbo]

WHat did your plugs look like, they could tell if detonation was a problem. Is there any way debries from your damaged piston could have entered the other cylinders?

Ceramic coating of pistons would give them better resistance against high temperatures.

J

[aronmatic2]

High temp! detonation or piston expanding more than normal. block machined to tight to the piston maibe?

the pistons are fitted to 0.05mm in the block.
that is perfect. experts made.

[Pirvu Eugen]

High temp! detonation or piston expanding more than normal. block machined to tight to the piston maibe?

[aronmatic2]

i had very small ignition angle on high boost area.
its around 8-10derees.
i will try 25-28degrees and lower boost next time.
its may help to lower the temperature in cylinder.

[kwlw]

i think i had material problem with my pistons. this pistons have to hold 730nm easy, if the stock pistons hold 600nm.
1 piston damaged hard and all the cylinder walls was schratched.
any idea?

There can be several reasons. Like detonation, preignition, material flaw, design flaw, etc.

Also it can be expansion issue, like Jamo said.

Sau

[aronmatic2]

i think i had material problem with my pistons. this pistons have to hold 730nm easy, if the stock pistons hold 600nm.
1 piston damaged hard and all the cylinder walls was schratched.
any idea?

[Jamo]

I have to say, the graph of your dyno run is the best I have seen up to approx 5000 rpm, where a couple of other high HP graps passes you. I would say probably one of the most driveable I5 engines out there if you can tune is to last a little bit longer.

It has the spool up of a 2871 on a 2,2 engine, it spools better than a 3071 on a 2,2 engine, and it would be nice to see the whole rpm graph at one time. I bet it is a wild thing to ride!

Best wishes for your further development!

Johan

That's very very very interesting to hear, Hope the new engine holds up Aron what an earth cause the piston to do that?????

I know Ross pistons expand more than JE pistons, there's a thread on here about it something to do with silicon content.

[S4turbo]

Very good numbers

I have to say, the graph of your dyno run is the best I have seen up to approx 5000 rpm, where a couple of other high HP graps passes you. I would say probably one of the most driveable I5 engines out there if you can tune is to last a little bit longer.

It has the spool up of a 2871 on a 2,2 engine, it spools better than a 3071 on a 2,2 engine, and it would be nice to see the whole rpm graph at one time. I bet it is a wild thing to ride!

Best wishes for your further development!

Johan

[aronmatic2]

Is it aftermarket piston, or just orginal one machined for lower comp ratio?

Sau

they are ross forged race pistons.