[Ducati] 999 compression figures?

[Rich Roberts]

I guess the range is to take into account leaks??? I used to think a good rule of thumb was CR times 14.7 psi, since the CR is a ratio of  bdc to tdc volumes and you should be filling with 14.7. But this was always a theoretical maximum I think and does not take into account the practical difficulty of getting an exact number without actually measuring volumes and then taking into account leaks at valves, seals and rings...or the difficulty of filling and holding at TDC. I take it you are doing a leak down test?  The other isue i ahve found is the typically poor leakdowns that do not seem to effect hp much. You know a Ducati really does depend on compression for valve sealing I think whereas a lot of motors have those pesky springs. When ding a leak down you do not have benefit of the substantial pressure of combustion, air just aint the same for sealing and the rings really do nto work so well with those measly pressures used for leakdown testing with
 air.  Truth be told the differences are not so great, should be able to look in shop manual for numbers, I guess that is what you are hoping someone will provide. Rich


----- Original Message ----
From: DesmoBob in Paradise <d3smob0b at hotmail.com>
To: ducati at ducati.net
Sent: Monday, September 24, 2007 10:58:03 PM
Subject: [Ducati] 999 compression figures?


Does anyone know the recommended cylinder compression for a 2003 999?

I have the factory manual for a 2006 749, but I imagine the figures for a 
999 would be different. For the 749, it says 9-11 bar (131-160 psi).

------------------------------
DesmoBob in Paradise

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