Technical camshaft types

jonjg · Oct 27, 2015

hello. ive got a few camshafts around and just wondered if anyone knew the difference with them. i have got an 866 in the fiat at the mo, but the 1 in the head im rebuilding has 4x4 stamped into it. also got 2 with 176 stamped into them. any info would be great.

henseyseries3 · Oct 27, 2015

I got told it as just and identification stamp as my seicento mpi cam has 4x4 stamped in it and my 866 obviously has 866 in

purf · Nov 1, 2015

Is the 4x4 cam better than the 176? My old Cinq sporting had the 176. I couldn't find any old posts with info.

RobW · Nov 6, 2015

4x4 cam is a torque profile from a Punto auto, 176 is a stock cinq Sporting cam

you want the 866, has more lift than the stock 176

purf · Nov 7, 2015

Was the 4x4 sometimes fitted to seicento mpi cars then. Maybe that's why mine is rubbish at higher rpm. I will check my cam!

henseyseries3 · Nov 8, 2015

purf said:
Was the 4x4 sometimes fitted to seicento mpi cars then. Maybe that's why mine is rubbish at higher rpm. I will check my cam!

My mpi had a 4x4 cam fitted it hits a wall at about about 5500rpm when you feel the power drop off the 866 from a punto 75 makes a difference even on a stock engine from mid to high range rpm

purf · Nov 8, 2015

Might explain why mine hits a wall at 5k rpm. It's terrible compared to my previous spi cinqs. Anyone know what cam is fitted to the 1242 8v punto?

LeonL · Nov 10, 2015

As far as i know a 4x4 is from a punto 60 and later mpi engine's.
Don't know if they are any good

cc1 · Nov 11, 2015

henseyseries3 said:
My mpi had a 4x4 cam fitted it hits a wall at about about 5500rpm when you feel the power drop off the 866 from a punto 75 makes a difference even on a stock engine from mid to high range rpm

The 866 is a very good upgrade but the 5.5k wall is probably due to ignition timing and not the fueling. Fitting a Supersprint manifold with an 866 is a must.

henseyseries3 · Nov 11, 2015

cc1 said:
The 866 is a very good upgrade but the 5.5k wall is probably due to ignition timing and not the fueling. Fitting a Supersprint manifold with an 866 is a must.

More then likey haven't really took it out properly with the 866 in to see if there's any diffrence thay far up the Rev range

Ian S · Nov 13, 2015

http://forum.clubcento.co.uk/viewtopic.php?f=18&t=568

Thread about the timing of these cams.

henseyseries3 · Nov 13, 2015

Wow reading that's has made me realise nice an upgrade the 866 is for an mpi seicento

Ian S · Nov 13, 2015

I fitted an 866 in my Cinq a few months ago.

Compared to the standard cam, which felt like it had a bit of a hollow between 1000 and 4000, then a bit of peak, then flattening off above 6000, the 866 is smooth everywhere, but with more get up and go everywhere. That hollow and that peak have gone and it feels better. It's very nice. And a fair bit louder everywhere.

Idles better than before. But I've shimmed it better than it was. Spot on now with the inlet valves the same and the exhaust valves the same, where they were a bit all over the place before.

purf · Nov 13, 2015

Going to scrappy tomorrow to hunt one down. Punto 60 is there. Fingers crossed. That's where i got my last one ?

henseyseries3 · Nov 14, 2015

Ian S said:
I fitted an 866 in my Cinq a few months ago.

Compared to the standard cam, which felt like it had a bit of a hollow between 1000 and 4000, then a bit of peak, then flattening off above 6000, the 866 is smooth everywhere, but with more get up and go everywhere. That hollow and that peak have gone and it feels better. It's very nice. And a fair bit louder everywhere.

Idles better than before. But I've shimmed it better than it was. Spot on now with the inlet valves the same and the exhaust valves the same, where they were a bit all over the place before.

Mines a little lumpy on tick over but over the that's it runs great in think mine just down to the ecu needing to get used to the extra lift and duration of the new cam damn mpi micro ecus

purf · Nov 14, 2015

SPI ecu's need to relearn too.

purf · Nov 14, 2015

I was lucky!

It was in a Punto 60 team. Looks like the tensioner bearing had failed as it was flapping about and the belt was off. Leading to it being scrapped... cost £22

henseyseries3 · Nov 15, 2015

I would have took the whole engine but your head on that bottom end with the cam in win win there

purf · Nov 15, 2015

Yes im trying to restrain myself from getting carried away with this Sei. Would love another 1242 but have other car priorities...

gazmac · Feb 7, 2016

Hi guys I found what I believe is an 866 cam in a punto today !
What is making me question it is it says 998 as you look at it is that correct I looked at the pic above and it looks the same as mine so is it an 866 and what are these shims people keep mentioning what do I need to put it in my 1.1 spi Cinq ?
Your help and knowledge is greatly appreciated
Garry

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