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(Post Link) post #1 of 16 Old 28-03-09 Thread Starter
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Help High Compression Pistons @ Twin Spark 2.0

Hi guys,

i am interested at the moment of upgrading my 2.0 twin spark engine (155hp). At the moment i have a kn filter installed, supersprint exhaust, racing cat 200cells and an ECU remapping

I want to install, forged high compression pistons and better camshafts and improve the valvs.

Regarding the camshafts i will use the catcams.

My problem is what to do regarding the high compression pistons. Which brand to use: Wisecco, woessner, CPS, accralite, mahle., or other?

Moreover, what the compression rate should be? I want to drive the car every day reliably. Friends here in Greece told me max 12:1 not more.

Is anyone here which used any?

Thanks in advance!

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(Post Link) post #2 of 16 Old 28-03-09 Thread Starter
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Re: High Compression Pistons @ Twin Spark 2.0

none?
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Re: High Compression Pistons @ Twin Spark 2.0

Are you going to remove the variable valve timing?

To be honest I would hold off on the pistons until you receive your head from being ported/blueprinted. Unless you are going down the forced induction route.
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Re: High Compression Pistons @ Twin Spark 2.0

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Originally Posted by 4lfa_male View Post
Are you going to remove the variable valve timing?

To be honest I would hold off on the pistons until you receive your head from being ported/blueprinted. Unless you are going down the forced induction route.
dear 4alfa,

no, iwon't remove the variable valve timing, why?

moreover i m not going down the force induction route.

i am thinking to use 85mm pistons of high compression (the normal size is 83mm)

thanks
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Re: High Compression Pistons @ Twin Spark 2.0

a fella called PJD30 on www.alfa156,net might be able to give you some guidance or may even ahve forged pistons for sale.
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Re: High Compression Pistons @ Twin Spark 2.0

What sort of power output are you looking for? 12:1 CR is very high.

Sorry, I didn't read your first post properly. If you will be using the car everyday its best to keep under 12.1 CR, then there will be no need for high compression pistons.

I would suggest getting the head ported and the inlet valve diameter increased slightly. Then remap the engine again. You could achieve a significant gain in power without losing the 'driveability' of the engine.

Last edited by Alitalia; 28-03-09 at 22:48. Reason: Didn't read first post fully.
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Re: High Compression Pistons @ Twin Spark 2.0

12:1 will give near 180 BHP ime. The problem is with the high compression pistons and variator is that at 3500 RPM the valves WILL hit the pistons in that setup, you really need to inhibit the variator to prevent the 25' advancement, then it really needs remaping again too.
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Re: High Compression Pistons @ Twin Spark 2.0

What fuel do you have available? I think the current CR is close to the limit for 95 RON, unless you have higher RON easily available, you'll be pinking all the time...
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(Post Link) post #9 of 16 Old 29-03-09 Thread Starter
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Re: High Compression Pistons @ Twin Spark 2.0

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Originally Posted by SEARs View Post
a fella called PJD30 on www.alfa156,net might be able to give you some guidance or may even ahve forged pistons for sale.

thanks mate, i am a member there...i ll check it
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Re: High Compression Pistons @ Twin Spark 2.0

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Originally Posted by 4lfa_male View Post
What sort of power output are you looking for? 12:1 CR is very high.

Sorry, I didn't read your first post properly. If you will be using the car everyday its best to keep under 12.1 CR, then there will be no need for high compression pistons.

I would suggest getting the head ported and the inlet valve diameter increased slightly. Then remap the engine again. You could achieve a significant gain in power without losing the 'driveability' of the engine.
Thanks mate for your answer. A friend here in Greece adviced me that if i want to drive my car every day i need to use (max) 11,5:1

i want o achive 3-4kgs torque and 25-30 hp in total (including the camshafts and valvs)

of course i will remap it and be careful with the gas (100 octane)

The thing is that will be it reliable?
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(Post Link) post #11 of 16 Old 29-03-09 Thread Starter
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Re: High Compression Pistons @ Twin Spark 2.0

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What fuel do you have available? I think the current CR is close to the limit for 95 RON, unless you have higher RON easily available, you'll be pinking all the time...
super unleaded is easilly found here. 1lt/098 euros

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Re: High Compression Pistons @ Twin Spark 2.0

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super unleaded is easilly found here. 1lt/098 euros

Lucky
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Re: High Compression Pistons @ Twin Spark 2.0

Alfa Romeo forum: 2 litre conrods/pistons for sale
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Re: High Compression Pistons @ Twin Spark 2.0

I would not suggest changing the cams, just get the head reworked by a specialist and I mean an absolute specialist; Guy Croft Racing Engines • Index page

If you are using it every day it will be a nightmare with different cams.
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Re: High Compression Pistons @ Twin Spark 2.0

thanks a lot man
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Re: High Compression Pistons @ Twin Spark 2.0

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Originally Posted by 4lfa_male View Post
I would not suggest changing the cams, just get the head reworked by a specialist and I mean an absolute specialist; Guy Croft Racing Engines • Index page

If you are using it every day it will be a nightmare with different cams.
the guy will rework the head is one of the best in Greece.

Regarding the cams, i am thinking to install not racing ones, but the road ones.

In the past i had installed on my 1.6 ts the cams of the 2.0 ts, with no probs in the city
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