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Title: Anyone tested 39 & 41mm FCR`s on the same engine? Post by: greenmonster on September 23, 2009, 06:39:33 AM W/o any engine mods between switch?
Differences in character, power, rideability etc? Title: Re: Anyone tested 39 & 41mm FCR`s on the same engine? Post by: Drunken Monkey on September 23, 2009, 07:15:49 AM I made the switch to 41s on my '91 900ss and the difference from stock was phenomenal.
No experience on the difference between 39s and 41s, however. Title: Re: Anyone tested 39 & 41mm FCR`s on the same engine? Post by: junior varsity on September 23, 2009, 06:12:09 PM Chris Kelley prefers 41's on the 900, 39's on the 750, says the ducatitech website and his store (CA-Cycleworks).
I'd like to hear more details about it. Perhaps in Tech it'll get more visibility. Title: Re: Anyone tested 39 & 41mm FCR`s on the same engine? Post by: MotoCreations on September 23, 2009, 08:12:28 PM I've run both on the same 968cc (900cc overbored) '95 900CR 2-valver engine (velocity stacks only w/BoomTubes) that is in my DesmoDevil now. The 41's worked well out of the box (mild tweaking) but I swapped onto another Ducati that was later sold. The 39's work ok and I get better gas mileage with them and probably about same horsepower -- but I've spent so much time rejetting/tweaking and getting them to work -- I really wish I had kept the 41's.
If I had the choice again, I'd have ordered the 41's. I bought the above 39's from Chris / CA-Cycleworks in 1999 -- there is a lot of mileage on them since then! My recommendation: 41's and use the K&N filter option with the stock airbox. You should be able to bolt them on and go ride within an hour and not have to do any tweaking / shimming needles / etc. I guarantee you would have no regrets making that choice. Title: Re: Anyone tested 39 & 41mm FCR`s on the same engine? Post by: greenmonster on September 29, 2009, 06:00:27 AM OK, thx,
guess I`ll stick w my 41`s then. Was thinking, w a mildly tuned 900, you´ll get a bit better acceleration w the smaller venturi. And sometimes I consider this: (http://www.jako-motorsport.de/daten/eigenprodukte/image/ansaugstutzen04.jpg) http://www.jako-motorsport.de/ (http://www.jako-motorsport.de/) , see eigenprodukte-ansaugstutzen. [evil] |