I just bought a 1368cc 16v starjet engine to replace the NON 1368cc 16v starjet engine currently in the Sei.

I presume, if i swap the head and head extension over, it'll all just work?

DO you have any further pictures of the head off dave? like the combustion chambers?

Also, what has been done to that head? Ported? Was it necessary to do it? Or just for more power? If I can keep the head, and just swap the extension over, that's be even better

Looks like anything from the head down is normal to me, but not peeked inside yet

Cheers,

Kristian

it cant be good having them bits stuck in the middle, i bad and did it with out taking the head off as it for my self :devil: with the carrier off all valves are shut so no bits should be inside, i blasted it all clean with compressed air then air paraffin cleaner.
i am putting the starjet carrier back on and just using the pulley off a 1.2 to replace the variable one. all the cam belts are same part numbers so it fit.

the head is supposed to have some thing what we used to call center squish years ago,

Are you swapping the cam over at all, and fitting a normal pulley, or blocking the oil flow on the cam? I don't know what you mean by "carrier"?

I will be pulling my head, just to see how different the chambers are. I am fitting a decomp plate anyway, so squish won't be so good....but power will once the turbo is installed


Any questions you have, just ask. I now have the starjet and non starjet, and have FULLY stripped the non starjet (100hp). It has piper cams and new pistons. The cams will go onto the newer engine.

Cheers,

Kristian

i using the star jet cams and hoping that no oil will come out think i am going to space the alternator over instead of changing the pulley, be easier i hope. ive only got a week to finish it

Ah, you have an issue there as well do you?

The only elegant way I found was to buy a punto oil pump, but not cheap

In the Sei engine bay, there was not enough space to move the alternator and belt over.....it hits the engine mount! I don't know WHERE punto mounts are, so you hopefully won't have the same problem.

I can't even understand WHERE the oil comes from? The centre hole is filled by the pulley bolt, there is a cam oil seal in there around the cam.....so where does the oil come from?

Cheers,

Kristian

hole to the side of center i think

aww crap i cant use the 1.2 cam pulley, cam is fatter so pulley wont sit on it

Got a picture? It should fit, but you will need to extend the crank sensor further out, or fit punto oil pump.

Kristian

whoops wrong end, i did edit now

You might also find the entire cam is larger, so you may not be able to drop a 1.2/1.4 cam in there anyway!

Best bet is to swap the stuff over from your other engine on the day you do the swap. Thats what I plan on doing.

Kristian

what is diameter of the 1.4 cam where pulley goes on, on the 1.4 you have there? thanks

Its in the car at the moment, all assembled, so will be hard to check. I'll try and have a look this evening for you though.

Kristian

cool thanks, i wish our eper worked then i could just check part numbers with my 1.2 pulley and a 100hp pulley

eper worked slowley and it has 2 numbers for a 1.4 pulley one is same as a 1.2 one isnt,
i wonder if there angone with a dead non starjet 1.4 engine that would sell me an exhaust cam

Just stick some 1.2 cams in, there easier to source.

I have had my 1.4 cams reprofiled to a 1.2 profile, and it works great

Sorry haven't had time to check the size for you/


Kristian

why did you have them reprofiled to a 1.2?

ive took cam to engineers shop now and he is is going to take the 1mm off so it fit

my car broke on the way back though

dave said:

why did you have them reprofiled to a 1.2?

ive took cam to engineers shop now and he is is going to take the 1mm off so it fit

my car broke on the way back though

Click to expand...

I know it's a very old thread however may I ask how this project progressed. Did you fit the 1.2 pulley on the 1.4 starjet cams and eliminated the Cam Variator? Any other mods you needed to do to fit the 1.2 pulley? Any other info will be appreciated. I am thinking of fitting hotter cams on my 1.4 Starjet but need to find a way to bypass/eliminate the cam variator.

Thanks

A bit of theory ? Here we go (again)

The ONLY way to increase engine power is to give it more fuel to burn !

Problem is that fuel to air ratio (in petrol car such as your 1.2 or 1.4) has to be very tight to the 'stochiometric' value, meaning you can't just put more fuel (i.e by increasing fuel pressure) but you have to feed BOTH more air and fuel . This can be quite easily achieved with a turbocharger.
If you're no the happy owner of a turbocharged car, you can still (like in the good old time) play with valve lifting, valve crossing angle, opening/closing angle etc. but the engine torque will be optimized for just a (very) short range in RPM because of gas speed, inertia, resonant waves etc.

To make the story short, unless you're a very-very good engine engineer with a lot of experience in tuning (I mean not just installing a Cone filter), I'd strongly recommend NOT to play with camshafts …

That being said, if it's for fun/learning/experiment, I can only approve

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

Bernievarian said:

A bit of theory ? Here we go (again)

The ONLY way to increase engine power is to give it more fuel to burn !

Problem is that fuel to air ratio (in petrol car such as your 1.2 or 1.4) has to be very tight to the 'stochiometric' value, meaning you can't just put more fuel (i.e by increasing fuel pressure) but you have to feed BOTH more air and fuel . This can be quite easily achieved with a turbocharger.
If you're no the happy owner of a turbocharged car, you can still (like in the good old time) play with valve lifting, valve crossing angle, opening/closing angle etc. but the engine torque will be optimized for just a (very) short range in RPM because of gas speed, inertia, resonant waves etc.

To make the story short, unless you're a very-very good engine engineer with a lot of experience in tuning (I mean not just installing a Cone filter), I'd strongly recommend NOT to play with camshafts …

That being said, if it's for fun/learning/experiment, I can only approve

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

Click to expand...

Bernie thanks for your advise.

I have modded quite a few cars with cams etc. both for road use as well as race.

The standard starjet cam is a joke. 0-40/40-5 timing 8mm inlet lift and 7.25 mm exhaust.
LATDC is 0.0mm inlet 0.1mm exhaust.
Compare them to the 1.2 16v older model 6-46/46-6 8.5mm lift both valves and LATDC of 0.3mm and this on a 1.2 engine. This was the Euro 2 model.
To get by Euro 4/5 Fiat choked the engine cam wise and by using VVT to retard the exhaust at low to mid revs/load made it breath an EGR rich mixture and till around 50% load made the exhaust rich mixture pass through only one inlet port per cylinder through the Port deactivation system. Basically one inlet port per cylinder is closed by a slider type plate in the intake manifold till over 50% load is reached. After that VVT and EGR is deactivated and the second port on every cylinder is opened. In fact it performs quite well above 3500 rpm as it is now (at those revs and above) a normal 16 valve engine but still limited by the cam duration and lift. But no wonder it is so lazy and pick up is so bad till say 3500rpm )))

My intention is to deactivate the Variable Valve Timing which operates the EGR (The VVT retards exhaust closure and opens the EGR valve), and also eliminate the Port Deactivation system.

If I see this can be done I will fit a warmer cam circa 250 duration, 8.5mm to 9mm Lift. LATDC around 0.5mm

But I need to find out if anyone has used the standard starjet cams on starjet engine with 1.2 or other engine size cam pulley as Dave was trying to do and what mods are needed to do this.

If normal (NON VVT) cam pulleys can used on Starjet standard cams than this will allow for deactivation of VVT as it operates by a hydraulic variator in the cam pulley itself. The same result would be achieved if anyone can confirm that they fitted non starjet (SO NON VVT) cams on starjet (SO VVT) engines using NON starjet so normal 1.2 or 1.4 pulleys.
This will allow for EGR deactivation and removal of the Port Deactivation system.

So basically you get an old school 16 valve engine without the restrictions which should respond well to mild road cams.

Have you any suggestions for me regarding this cam pulley swap?


Thanks

PuntoStav said:

I know it's a very old thread however may I ask how this project progressed. Did you fit the 1.2 pulley on the 1.4 starjet cams and eliminated the Cam Variator? Any other mods you needed to do to fit the 1.2 pulley? Any other info will be appreciated. I am thinking of fitting hotter cams on my 1.4 Starjet but need to find a way to bypass/eliminate the cam variator.

Thanks

Click to expand...

yes i did do it, you need to remove head and block the oil feed to it. i wouldn't bother in your case as setting up hot cams on a 16v super fire for road use is a pain in the arse and not a lot of people can do it.