quote:ok, some pro's in here....let me ask a hypothetical question.
If we revved the ZX14 to 11000rpm and held it there at 11000rpm, would it benefit from shorter stacks???
How much shorter does one shorten the stacks? Are we talking 5mm?
Thanks for your thoughts!!
Well I had a very large post typed out for this thread but my laptop froze up and i lost it. Now its late and I don't feel like trying to rewrite it all......
So I'm going to over simplify this answer...........you change the stack length a little to move the timing a little. You change the length a lot to change the order of harmonic you want to be the first one you take advantage of.
I highly recomend the book "The Design and Simulation of 4 stroke Engines" by gordon Blair. This book will explain all this. If you are a SAE member then you can get it for about $90.
Amazon also has it.
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Y2KZX12R
CompetitionCNC.com
posted December 27, 2011 07:03 PM
http://youtu.be/h2jTKNHNr8g
A picture is worth a 1000 words, this will show the Harmonics, bouncing the fuel back out the intake port, the standoff cloud of fuel above the bellmouth.
Injector above the bellmouth must get better fuel atomization, a better , more complete burn, You figure? I guessing ..
Man, love the sound of a F1 engine, making some fine music, damn that's PRETTY .
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"I have never met a man so Ignorant that I coun't Learn from him"..."Galileo"
Expert Class
My 12R gone but not forgotten
Posts: 218
posted December 28, 2011 04:47 PM
nice post that is like listening to mozart when it comes to engines, thats what i use for a ringtine is a formula one car, the piston speeds are insane considering the size of the engine.
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2012 ZX-14R SE
2002 VULCAN MEAN STREAK (11.41 @ 114 best 1/4)
I BLEED GREEN
posted December 29, 2011 03:24 PM
The other issues that are a real problem are valve springs.
F1 engines havent used them in years and you dont want to know the cost of the prostock car springs and they dont last long in 1/4 mile bursts let alone land speed racing for 26 seconds at red line over and over again.
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Y2KZX12R
CompetitionCNC.com
posted December 29, 2011 06:30 PM
Remember seeing some buckets from a Yoshimura Road Racer, 1000, 2 valve Suz back in 80's, they drilled holes , like 10-- 1/4 in , too lighten buckets. i was wondering if it didn't help oil cool valve springs also ?? Get more splash to top of spring . pure guess by me .
NASCAR engines usto have a lot of failures , dropping valves, valve train related, then they went to spraying oil directly on springs , to help extend spring life, they have very few these days , and they Rev up to 10,000 for as many as 600 miles
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"I have never met a man so Ignorant that I coun't Learn from him"..."Galileo"
quote:The other issues that are a real problem are valve springs.
F1 engines havent used them in years and you dont want to know the cost of the prostock car springs and they dont last long in 1/4 mile bursts let alone land speed racing for 26 seconds at red line over and over again.
I understand that the top of the valve can 'spread' out the air on intake into the cylinder and Suzuki had something like that TSCC on its GSX range yonks ago.
Why don't they use camera 'shutter' technology (I don't mean an iris), but a metal sheet/plate that would slide away to open and then slide across to close (electromechanics could surely do it fast enough nowadays), to open and close the intake and exhaust inputs.
They could certainly open and close fast enough.
Just need to work out how to handle the compression forces - Minor technicality
quote:Remember seeing some buckets from a Yoshimura Road Racer, 1000, 2 valve Suz back in 80's, they drilled holes , like 10-- 1/4 in , too lighten buckets. i was wondering if it didn't help oil cool valve springs also ?? Get more splash to top of spring . pure guess by me .
NASCAR engines usto have a lot of failures , dropping valves, valve train related, then they went to spraying oil directly on springs , to help extend spring life, they have very few these days , and they Rev up to 10,000 for as many as 600 miles
We build SB 2.2 motors for several classes of racing at the shop..... your right they all have sprayers.
However the SB 2.2 engines havent been used in the nascar sprint cup series in several years now since everyone (running GM engines) started using the RO-7 engine.
Its a completely new engine designed from the ground up for that class of racing and it has several very different features. On those engines the valve covers are kept full of oil the whole time the engine is running so the springs are submerged in oil all the time to cool them and help dampen the violent goings on in there.
These engines consume several gallons of oil during a long race. Kinda scary. You don't see them smoke thou do you?
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Y2KZX12R
CompetitionCNC.com
quote:The other issues that are a real problem are valve springs.
F1 engines havent used them in years and you dont want to know the cost of the prostock car springs and they dont last long in 1/4 mile bursts let alone land speed racing for 26 seconds at red line over and over again.
I understand that the top of the valve can 'spread' out the air on intake into the cylinder and Suzuki had something like that TSCC on its GSX range yonks ago.
Why don't they use camera 'shutter' technology (I don't mean an iris), but a metal sheet/plate that would slide away to open and then slide across to close (electromechanics could surely do it fast enough nowadays), to open and close the intake and exhaust inputs.
They could certainly open and close fast enough.
Just need to work out how to handle the compression forces - Minor technicality
Yea that would be interesting..... ____________
Y2KZX12R
CompetitionCNC.com
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posted December 25, 2011 07:31 PM
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