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Discussion Starter #1
If you,or anyone you know have had any of the following :
*blowby issues
* the Ducati crankcase drilling/venting "modification" done to your bike
* oil on your tires
*a blown motor
* oil injested into the airbox then into the cylinders
* oil spewing out of your bike from various places ( namely the airbox or upper motor )
*blown head gasket
* smoke out of your exhaust
or if you needed motor work done
( motor rebuild , crankcase drilled for the crank case vent mod etc ) including having oil in your airbox, please post up.
 
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Re: 999/749 problems (999Duc)

I only have like 80 miles on mine now but I have residue of oil where the case halves meet on the extreme bottom of the engine and have found the same on the outside of fairing halves in a wind blown streak.
I wipe it and watch the level.
 
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Re: 999/749 problems (Busamouse)

I have 23000 miles on an 2003 999S. With exception of a rear sub frame replacement, no problems. It has had a belt service and regular oil changes with Mobil 1 15/50. Never added oil. The bike has been great! The finish is showroom.
 
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Re: 999/749 problems (theo)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by theo »</TD></TR><TR><TD CLASS="quote">I have 23000 miles on an 2003 999S. With exception of a rear sub frame replacement, no problems. It has had a belt service and regular oil changes with Mobil 1 15/50. Never added oil. The bike has been great! The finish is showroom.</TD></TR></TABLE>

Thats great
. Just wondering why you posted in this thread?
 
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Yes I have a lot of experiance with the problem. If you study the crank-case vent you will see that the oil return hole in the vent is insufficant to drain back the oil. The problem only occures on a few bikes and it only happens at higher RPM's. The transport of the oil becomes exponential with oil temperature. We have fixed many of these problems. I do not like adding the additional vent to the cases. The problem is most offten seen in the 998 model. Ducati is working on several redesigns to fix the problem. I suggest that you change the crank-case breather to a corsa type vent (open vent about 1") and use a 748 RS read valve installed in the air box. The 748RS valve will close the circuit durring hard throttle chops so you do not reverse pressurize the sump. It will take some minor modes to change the vent, the tubing is much larger, generaly we make a step down transition to go from one vent hose size to the other. I hope this helps. If you need additional info please contact me directly and I can explain it to you over the phone. Good Luck, don't worry the problem is fixable. And the bikes power and response will increase with the reduced crank-case pressure.
 
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Re: 999/749 problems (999Duc)

There may be more than one problem out there, but I had a s#!t load of oil draining from my '04 999. I got new pistons, rings and cylinders all done by the dealer, and it was their analysis that came to that conclusion. If you have this problem, drilling holes or improving the venting on your case is only a band-aid for a more serious problem.
 
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Discussion Starter #7
We have done the piston cylinder change mode on several bikes, and we still had blow-by which is the cause of the oil propogation. The true fix is to better vent the crank-case. Changing the pistons and cylinders does not solve the problem in all casees. Let me explain to you the problem, you have a very over-square piston 100mm bore by 62mm stroke, at high RPM you have some level of piston rock, and ring flutter. This causes some of the compression mixture to leak past the piston/rings and pressurize the crank case. At high RPM and oil temperature you start transporting oil through the vent. The return hole in the vent is to small to allow all the oil to return it is transported up the vent into the air-box. We have tried and experimanted with many fixes pistons-cylinders, pistal- pistons, etc the best fix is to modify the breather as I previously stated. We do leak down tests on the engines both cold and hot and the engines are tight, good ring seal, the problem is not ring seal or cylinder wear, it is caused by piston rock and ring flutter. The new engines with the deep sump will be much less prone to have this problem. Fix the vent if you need conformation and don't belive me ask someone who knows Ducs, I would try Bruce at BCM or John Hacket at JHP, I have discussed this problem with both of them on several occasions.
 
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Re: 999/749 problems (999Duc)

It's me, the one with the 04 749 dark that had a blowby under 700 miles. The latest is...they gave me an 05!!! Good luck with your troubles and hopefully, this helps. Send me an instant message again if you have any questions.

Rich
 
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Re: 999/749 problems (999Duc)

Tony

Whats up man you wanna come to the trackday ?? Let me know I am running out of spaces Bro

Cheers
Ryan
 
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Re: 999/749 problems (Doo Cat One)

congrats rich
that is great news
 
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Re: 999/749 problems (mrgrn)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrgrn »</TD></TR><TR><TD CLASS="quote">congrats rich
that is great news
</TD></TR></TABLE>

Thanks! It's fantastic news. Let's just hope my posts from now on are going to stay on a positive note.
 
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Re: 999/749 problems (Doo Cat One)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Doo Cat One »</TD></TR><TR><TD CLASS="quote">Tony

Whats up man you wanna come to the trackday ?? Let me know I am running out of spaces Bro

Cheers
Ryan
</TD></TR></TABLE>

Ryan,
Im here , but that is a different guy that had blowby on his bike , same exact story but his was a 749.
However I will be calling you to reserve my track day spot this week , I hope there are 3 spots or so left.
 
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