Tuning 1368 8 v head

[Martini Gasolini]

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Posted this in the Grande Punto section with no repply.
Seems like the cinq/sei owners are more into engine tuning

1368 8v head any good?
Anyone compared it against the trusty old 1242 75 head?
Bought a grande Punto engine the other day,2007 mod.
Took the engine apart and found some things of interest.
Intake valves are 33 mm in dia,instead of 31mm,and has only 5 mm shaft,compared to the 75 heads massive 7 mm.
It is also 3 mm longer than the 75 ones,and uses therefore thinner shims.
Clever!
Will be using lightweight Cosworth lifters with lashcaps anyway.
But i don`t have any 75 head to compare with,think the 1368 head seems to have a much more rough surface.
Will be using this in a Fiat 850 with throttle bodies and engine management.
Would love to hear if someone has been looking in to this.

Also,anyone know if p75 camshaft will fit in the 1368 head?
Apart from the cam sensor on the 1368,they look similar.
Easier to get an aftermarket camshaft to the 1108/1242 range.
Martini Gasolini

 

[Todger182]

I would say the 1368 cam has a better lift over the 1242 (p75) 866 cam. People have looked into using that cam but hard to come by seperated from the engine.

Most of us lot though recycle the sei or cinq head and just fit the cam plus re-shimming.

Thanks

 

[ycming]

Sounds interesting, but do keep us updated tho is the old 1242 8vcam fits the new 1368 8v engine!

Ming

 

[Martini Gasolini]

Hey,knew there would be some answers over in this section!

Measured the standard 1368 8v camshaft,9,5mm in lift.

Can flywheels be swapped on those engines aswell?
Have a lightened 1242 flywheel back home in Norway that i could use.
The dual mass from the 1368 eights in at 6,5 kg.

Martini Gasolini

 

[Todger182]

Yea you can use the flywheels. Depends on which is bigger though.

Normally bigger flywheels can perform better with reduced weight.

Just done my mystery flywheel today, quite alot taken off it but it's not a hardcore amount .

Thanks

 

[arc]

these 'bigger' flywheels are no bigger, they just have a larger clutch face on them

 

[Todger182]

these 'bigger' flywheels are no bigger, they just have a larger clutch face on them

Doh!

Thanks ARC

 

[dave]

careful isn't the 1368 8 v head vvt? if its anything like the 16v then it will have different end on the cam where pulley fits and take a different size oil seal

 

[ycming]

careful isn't the 1368 8 v head vvt? if its anything like the 16v then it will have different end on the cam where pulley fits and take a different size oil seal

How does a head makes a engine VVT ????????

Ming

 

[dave]

How does a head makes a engine VVT ????????

Ming

the cam pulley and different oil ways for the thing that makes the oil go into the pulley to adjust it

i dont know for sure if its a problem on the 8v, just suggesting the op checks.

the 16v grande seems head is bathed in oil at postive pressure, if you take the sprung diafram (sp?) out of the crank case vent an fit oil catch tank with out it, it pumps all the oil out into the tank in seconds

 

[ycming]

Hmm, how does the VVT stuff work in the Fiat ??

the only experience i have with any sort of these stuff is vtec .... Is it a similar concept ?

Ming

 

[arc]

it's not really a full VVT system, it just alters the timing of the exhaust cam so that the cat heats up quicker.

 

[ycming]

it's not really a full VVT system, it just alters the timing of the exhaust cam so that the cat heats up quicker.

How does it alter the timing tho? Is it through electronics or ?

ming

 

[arc]

solenoid that directs oil flow one way or the other, which effects the cam pulley

 

[dave]

it's not really a full VVT system, it just alters the timing of the exhaust cam so that the cat heats up quicker.

but the 8v only has 1 cam so inlet must get altered too? unless it work very fast. am sure some one said the 8v is vvt thats why it needs locking tools to do cam belt

 

[Brooky]

Just done my mystery flywheel today, quite alot taken off it but it's not a hardcore amount .

Thanks

How much you get off?

 

[Todger182]

2 Kg's probs too much but it did weigh in at a fair bit. It will give me some more "oomf" at the wheels hopefully.

Thanks

 

[Martini Gasolini]

Took mine from 6,5 to 3.9 kg with lathe and mill.
Scrappy picture,but there is a flywheel mounted on the rotary table there
Could go further by drilling the outer rim,but was happy with that result.
If it is so that the Punto 1242 will fit on my 1368 engine is the flywheel up for grabs,if someone of you are into mucho power!
Got a good 200 mm disc on it.

Martini Gasolini

 

[whitz]

Took mine from 6,5 to 3.9 kg with lathe and mill.
Scrappy picture,but there is a flywheel mounted on the rotary table there
Could go further by drilling the outer rim,but was happy with that result.
If it is so that the Punto 1242 will fit on my 1368 engine is the flywheel up for grabs,if someone of you are into mucho power!
Got a good 200 mm disc on it.

Martini Gasolini

i hope you balanced it properly

 

[Martini Gasolini]

i hope you balanced it properly

Yupp,no worries.
Got it dynamically balanced afterwards.
Was only 11 grams out

Martini Gasolini