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Author Topic: Cams, Compression and Such. A Discussion.  (Read 9872 times)
ducatiz
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« Reply #15 on: June 20, 2016, 11:18:28 AM »
Quote from: Dirty Duc on June 20, 2016, 09:40:38 AM
http://shop.pitsterpro.com/frdez-d-compressionsystem.aspx

Quote
This system has been tested on stock 50cc motors to all the way up to 240cc monster pitbike motors

240cc?  whoa.  so i can use it on my chainsaw... but not my bike...
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« Reply #16 on: June 20, 2016, 11:23:33 AM »
Interesting discussion as I've just installed 12:1 forged pistons in my 748s...  But, I'm at 5000+ feet elevation, so we have less air up here.
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ducatiz
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« Reply #17 on: June 20, 2016, 11:41:06 AM »
Quote from: Duck-Stew on June 20, 2016, 11:23:33 AM
Interesting discussion as I've just installed 12:1 forged pistons in my 748s...  But, I'm at 5000+ feet elevation, so we have less air up here.

forged?  couldn't get real ones eh?  that's the breaks..
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"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the air—these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.
ducpainter
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« Reply #18 on: June 20, 2016, 11:50:34 AM »
cracking yourself up today...eh counselor? Grin
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« Reply #19 on: June 20, 2016, 11:51:29 AM »
Interesting to see how it runs up there. You staying with stock cams and intake?


The very high cranking and mechanical compression on that 944 was corrected with a cam change adjusting corrected compression and increasing effective compression around peak torque output (which moved higher up the rev range).
It got me thinking about the relationship between those components including porting and airbox/intake mods. It raises the question of what kind of compression people are talking about.
 I suspected the enlarged airbox may have contributed to the increase in effective compression in conjunction with the 900ie cams. Would like to see this motor ported. Gotta get the bike back on the dyno.



I remember decompression levers btw. Grin
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« Reply #20 on: June 20, 2016, 11:53:01 AM »
Quote from: ducpainter on June 20, 2016, 11:50:34 AM
cracking yourself up today...eh counselor? Grin

He's on a roll. Grin
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« Reply #21 on: June 20, 2016, 11:57:13 AM »
Those 12:1's will get you down to the top of Mulholland or thereabouts...
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« Reply #22 on: June 20, 2016, 02:08:43 PM »
Quote from: ducatiz on June 20, 2016, 11:41:06 AM
forged?  couldn't get real ones eh?  that's the breaks..

Gotta admit, I enjoyed that.

Craslo, got any info on that DVT?
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DarkMonster620
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« Reply #23 on: June 20, 2016, 02:20:52 PM »
Quote from: howie on June 20, 2016, 02:08:43 PM
Gotta admit, I enjoyed that.

Craslo, got any info on that DVT?
you mean Ducati Variable Timing? It does have a "decompression" setting built into it . . . Different to 1199/899/959 Panigale . . .
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Carlos
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« Reply #24 on: June 20, 2016, 02:30:23 PM »
Yes, maybe some factory stuff.
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DarkMonster620
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« Reply #25 on: June 20, 2016, 02:44:01 PM »
Quote from: howie on June 20, 2016, 02:30:23 PM
Yes, maybe some factory stuff.
DVT has a "built in" code that depresses one exhaust valve enough to release preasure so that the engine starts easier while the Panigale, has "a lever" that pushes exhaust valve open to release preasure . . .

Sadly, now, all my privileges have been eliminated and no longer have access to tech writings [official]
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Carlos
I said I was smart, never that I had my shit together
Quote from: ducatiz on March 27, 2014, 07:34:34 AM
Ducati is the pretty girl that can't walk in heels without stumbling. I still love her.
"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."
koko64
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« Reply #26 on: June 20, 2016, 03:29:49 PM »
Quote from: koko64 on June 20, 2016, 11:51:29 AM
Interesting to see how it runs up there. You staying with stock cams and intake?

Probably a dumb question. Cheesy
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« Reply #27 on: June 20, 2016, 03:31:23 PM »
Quote from: DarkMonster620 on June 20, 2016, 02:44:01 PM

Sadly, now, all my privileges have been eliminated and no longer have access to tech writings [official]

We lost our "inside man", The Mole! Wink
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ducatiz
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« Reply #28 on: June 21, 2016, 05:11:58 AM »
Quote from: DarkMonster620 on June 20, 2016, 02:44:01 PM
DVT has a "built in" code that depresses one exhaust valve enough to release preasure so that the engine starts easier while the Panigale, has "a lever" that pushes exhaust valve open to release preasure . . .

Sadly, now, all my privileges have been eliminated and no longer have access to tech writings [official]

ah, that's what it was.  i knew it was something like that
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"Yelling out of cars, turning your speakers out the window to blast your music onto the street, setting off M-80 firecrackers, firing automatic weapons into the air—these are all well and good. But none of them create a merry atmosphere of insouciance and bonhomie quite like a revving motorcycle.
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« Reply #29 on: June 21, 2016, 05:29:36 AM »
Quote from: koko64 on June 20, 2016, 11:51:29 AM
Interesting to see how it runs up there. You staying with stock cams and intake?

Stock cams, valves & intake system.  Being of smaller displacement should help w/starting amperage draw.  Should have all the bits to complete it by this weekend so I'll keep everyone posted.
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