Ducati John / S4 SPS cams

Got my S4 back on the road today, its been fitted with SPS cams by Ducati John, seems a top job.

Only taken it 6000 rpm so far as I need to make sure the fueling is correct by taking it to a dyno centre but the cams so far seem a good investment, thought they may have screwed up the bottom end torque, not at all, its smoother and the induction noise is wonderful now!

just wait till you can take it to the red line (well +7k rpm anyway) its a different beast and the monster it always should have been

With some tweaking of the ECU, it should go all the way to eleven!! My Beelzebub does!!

can you do that ? and is that wise ?

Originally Posted by Scotty

just wait till you can take it to the red line (well +7k rpm anyway) its a different beast and the monster it always should have been

fully tested now, can't believe the difference, where it hit a brick wall before is now is the start of it waking up all the way up to the 10,000 rpm mark

rarrrr

want a race ?

Originally Posted by Scotty

rarrrr

want a race ?

yes, will have to be on my 125 though, eats scooters for breakfast, bored out to 180

[bigredduke]

That brings back memories! I had one of those as a commutetoworkhack for my first job after leaving school. It was a 1973 model 'L' registration, same colour as well. It never once let me down despite constant abuse & lack of maintenance. The engine was so sweet, revved like buggery & would happily cruise all day at 65mph. Looked like a real heap though, even then!

[Grumpy]

i've been thinking about changing the cams on my s4 ( i've aleady fitted a stage 2 ecu), but was unsure as to which ones to use. Are the sps cams the same as supplied in the factory kit? or are they just a better option to fit?

Originally Posted by white537

i've been thinking about changing the cams on my s4 ( i've aleady fitted a stage 2 ecu), but was unsure as to which ones to use. Are the sps cams the same as supplied in the factory kit? or are they just a better option to fit?

Yes them same, the factory kit uses the SPS cams.

did you get a dyno printout Shaun ?

Originally Posted by Scotty

did you get a dyno printout Shaun ?

Aye I did, will post it later.

Torque 67 ft-lb
Power 107 BHP

The dyno chappy said he could have squeezed 110 BHP out of it but wasn't any point in thrashing the b*ks off it.

The above values are at the back wheel so well up on standard, most manufacturers use at the crank values which distorts matters.

Well worth it, £25 is all they charged me.

so is there much of a dip at 5k ?

Originally Posted by Scotty

so is there much of a dip at 5k ?

remember you saying that you had a bit of flat spot around 5k, no flat spot in fact in pulls like a train, bit of a dip at 7.5 but can't notice it on the road.

umm i must get a dyno run done
just for interest like