Approximate life of a testastretta race engine - Page 3 - Ducati.ms - The Ultimate Ducati Forum
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post #21 of 33 (permalink) Old Feb 10th, 2010, 10:54 am
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Quote:
Originally Posted by JohnMH View Post
My bad. A 66mm crank makes for 1120cc not 1180.

Still, in a 999R Fila streetbike it made a 21 hp difference:

http://www.ferracci.com/custombikes/.../fila-dyno.gif

My hp figure is a bit north of the 1120 Fila bike right now and the law of diminishing returns suggests I may get less than 21 hp, but I like the 9500 rpm power peak.
Take into consideration the piston speed for both engines at max RPM...

1020R 66mm stroke @9500 rpm = 4114 FPM

999R 58.8mm stroke @10500 = 4051 FPM

http://www.csgnetwork.com/pistonspeedcalc.html

-MATT
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post #22 of 33 (permalink) Old Feb 10th, 2010, 11:57 am
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Originally Posted by Bella749 View Post
Take into consideration the piston speed for both engines at max RPM...

1020R 66mm stroke @9500 rpm = 4114 FPM

999R 58.8mm stroke @10500 = 4051 FPM
The 1198R @ 11000 RPM = 4900 FPM

The 999RS @ 13000 RPM (which is what you'd need to run it at to produce the same power) = 5416 FPM

Those are slightly more realistic numbers for 1098R power vs 999RS power at a given RPM. So roughly 500fpm difference in piston speed between the two and the 1198R will probably produce more power at 11000 RPM if tuned to the level of the 999RS.

Compare the Ducati corse numbers;

The 1198F10 @ 12,000 RPM = 5000 FPM (110+ lb torq and 197 rwhp)
The 999F07 @ 14,000 RPM = 5833 FPM (98lb torq and 194 rwhp)



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post #23 of 33 (permalink) Old Feb 10th, 2010, 12:44 pm Thread Starter
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With the stock stroke at 11,500 rpm piston speed is 4437 fpm.

With the 66mm stroke at 9500 it drops to 4114. The question is how do I know how many rpm I need to hit a certain level of horsepower? Can I get similar hp with a longer stroke, more displacement and less rpm?

Cool website btw.
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post #24 of 33 (permalink) Old Feb 10th, 2010, 1:02 pm Thread Starter
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Split liner, as expected. Nasty.
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post #25 of 33 (permalink) Old Feb 10th, 2010, 1:18 pm
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Split liner, as expected. Nasty.
Ohh, that sucks!



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post #26 of 33 (permalink) Old Feb 11th, 2010, 6:30 am
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So what would the estimate be for a 999s 150 rwbhp engine?

To get 150 rwhp with a 998s/999s engine : the easy way is the use a big bore kit with 102mm pistal piston (1038cc).

Look this dyno curve (same bench) rear wheel power :



run file 006 : 1038cc + 54mm full exhaust
run file 022 : 1038cc + 57mm full exhaust + cylinder head work

and soon : 1038cc + 60mm full exhaust + 58mm throttle bodies with 12 holes injectors ( 5 bars fuel pressure ) + oversized airbox.

i have seen a 999R engine in 1078cc + cylinder head work, 57mm full exhaust and 58mm TB at 175 rwhp... But unfortunaly the owner don't give me the curve.

Panigale Stocksport race bike
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post #27 of 33 (permalink) Old Feb 11th, 2010, 9:29 am Thread Starter
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The 999R has a 104mm piston, but the Ducati recommended cylinder replacement interval for racing is 900km.

On the good side of the ledger, the engine is now completely apart, aside from some chroming loss on some shifter dogs the internals are pristine. New bearings and away we go! I guess 11,500 seems to be a good rev limit. I have lots of pictures, will try to post them later.

I am getting a RS alternator and new RS left side engine case installed. Major weight reduction for the flywheel and alternator weight.

This perhaps ought to be the subject of another post, but has anyone ever tried to install stock 999R throttle bodies inside a real RS airbox (the one with the gas tank which acts as a cover for the airbox). Am considering the next step as it looks like the bike may race again. The issue seems to be shape of the base of the TB and the height of the injectors (maybe not an issue as the RS ones are tall).

I am so happy that the bike may make it to the next race.
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post #28 of 33 (permalink) Old Feb 11th, 2010, 12:20 pm
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I am so happy that the bike may make it to the next race.
How are you gonna fix that bore? Can you buy another one easily?



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post #29 of 33 (permalink) Old Feb 11th, 2010, 12:43 pm Thread Starter
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Nothing a new $1400 cylinder wont fix. The first quote to fix the engine was $20k. Gulp.

Crank journal and piston from horizontal cylinder look ok:
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post #30 of 33 (permalink) Old Feb 11th, 2010, 1:51 pm
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the R cylinders are closer to 3k US moneys... whats this 1400 you speak of? me likey...

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