s4r engine rebuilt need help!!!

[Metzis]

Lets take it from scratch because i know a thing or two about bikes but i am not a mechanic or a ducati expert mechanically speaking.

i have right now two motor to spare a 2002 st4 916 full stock and a 916 motor from a 916 bike, wich has in it a pair of pankls con rods, these should be the sp ones i really don't know if they are titanium or combination of alloy like the carillos.

So... should i put on those for road use? If they messure 22mm on the bottom i can't use them at all?
I am being annoying i know and sorry about that but i want to avoid any mistake, because i am feeling that i can't take to "rip down" my bike a third time....
If the 916 motor has sp cams too except from the con rods should i use those? Do they have a bigger lift or duration?

I have some good news too, i found in the workshop a nice pair of termignoni st4 headers. A nice adding for my exhaust project...



P.s Thanks all of u for your helpfull answers!!!!!

[Metzis]

I found a pair o 916 sp cams and they look really aggressive with a lot more duration and probably 1mm of lift more i didn't messure them though...
I mesure the piston pin from my engine and it mesures 20mm, from the 916 sp it mesures 21mm, if this is the instalation hassle i will anyway order new pistons because mine was damaged a little bit from the anorthodox movement of the con rod and i can order the new ones with 21mm pin.
Does anyone know from what metal those pankl 916 sp rods are made?

[brad black]

Go to my reports page and read all about cams, etc. And 916SP power delivery, and all that stuff.

916 SP has an In between rod, small end located, but wide. Good luck finding any pistons with 21mm pin, 916SP, 888SP5 only. Rods will be steel.

900 crank, extra base gasket, sps cams. If you want more power, do the heads. Or buy an s4rs.

[Metzis]

Thanks brad Black for all your help full comments, eventually because i cant find locally a 900 crank and because i have already one from the st4 i will use it as i am going to do with the oil pump from the same motor just in case.... I installed yesterday the sp cams on my heads and oh my god these cams are aggressive... I also managed to check the valve clearence at he vertical head on Monday i will do the other also... I am very curious  to see the dyno results when the whole bike is back together.... Anyway i am on a ferracci high comp piston kit  but also i did like to know if the half bearings from the con rods and the bolts of the con rods are available in the market except the ducati dealers, as oem products.....

[Metzis]

hey guys it is time for me to order new half bearings for my duc but i can't figure out which ones should i order!!! to the numbers now i have both crank and con rods marked with "B" my crank pin messure 42.02 mm and the play between pivot shaft and con rod bearings is 0.052... What half bearing colours should i order because the dealer can't help me and when i told him that the manual says " "b" crank "b" con rod" 1 blue 1 red he told me not a chance " is that true? Should i order or RED or BlUE?  Please help!!!!

[brad black]

generally you need 2 blues, no matter what the manual implies.  get a machine shop to resize the rods to minimum and check the clearance.

[Metzis]

Thanks... i will do...

[Metzis]

The motor block is ready i installed blue half bearings as Brad indicated me and it was the right thing to do   !!! I had tuned my heads with the Gs & As camshafts but after some reading and a lot of consideration + people here told not to put them, i took them again off and put back the std ones i had, for now...  I am not building a race bike and i think i wont be happy neither my engine with the high rev power window those camsafts give. I have already put the corsa camshafts for sale so i can buy probably a FBF set with the money because i want those ++ horse !  I after all ordered a FBF piston kit with 12.5 final comp. Because i used st4 crank and rods i had to machine each piston 1.6mm total because the st4 con rods are little bit more wide than mine, and i saw that after putting the hole thing together otherwise i could machine much more easily the con rods. What centerlines do you people think should i use considering i have a little more comp than stock? I will probably will use a MWR HE filter and a custom combination of termi st4 headers and gb carbon mufflers. Chears

[brad black]

you should have used the 996 rods.

i'd use the same cam timing i always do.

[Metzis]

I thought they were the same :/ anyway i don't think i will have any issues as they look pretty tough too, just a little bit more friction on the piston pin because of the wide conrod!!!! Ok i will go 108/108 centerlines but first i have to make 1000 slow km before i step on the dyno!!!! Thanks again!!!!! I will update asap

[Metzis]

Finaly i fired up my baby today, no weard noises from the engine, it started up quite easy.... I will do few slow kilometer  without revving the engine, because of the new pistons after that i will install new exhaust new friction plates and i will tune it with custom map on the dyno.

[brad black]

get it hot once until the fans come on, then allow it to cool to cold.  that will let the pistons move.  then get it hot again and give it a hard time.  if it has new rod bearings i wouldn't rev it over 6 for a while, but certainly give it full throttle 4 to 6 to bed the rings in.

[Metzis]

Yes that is exactly what my mechanic told me to do... To run it jently untli 5 to 6 rpm. When i fired up i let it go hot i open the cap of the conteiner over the engine so the coolant can bleed easy, i also unscrew the bolts of the oil lines on both cylinders just to be sure about oil circulation, i double check also the belts because they are new... I hope everything will be fine Thanks egain for everything as soon as i have any news from the bike progress i will update....

[Metzis]

first run on the dyno yesterday and it was a bust hp speaking!!!! 95 whp at 7250  9.7 torque at around 5500 something went wrong imo!!! Very nice pull but it dies really soon.... I will tweak the cams and re run on Monday...

[koko64]

95!
Find out what's wrong?