Originally Posted by JKav
(Post 539212)
Sparetire, what you and the Hotrod article are referring to is VE.
I have yet to see an engine detonate due to an excessive VE. I have seen it happen with a high DCR. |
Originally Posted by JKav
ZOMG! My cylinders are so full of air and fuel, its gonna EXPLODE!!1!12@
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Originally Posted by Full_Tilt_Boogie
(Post 539223)
*Translated for emphasis of absurdity*
Feel stupid yet? Frank |
Originally Posted by Full_Tilt_Boogie
(Post 539218)
Also, youre retarded and you smoke cock.
I got a pretty damn good grade in Thermodynamics...JKav is right fucking on. |
Then I am confused. I hear engine builders and tuners talk about DCR all the time. How you can get away with a higher static comp if you have a mild DCR. So while you cannot measure DCR like you can SCR, it certanly matters. Just as you cannot measure HP, only TQ and RPM. Technically it does'nt exist, but it matters and is a characteristic of an engine affected by valve timing, SCR, etc. There is a pretty good Wiki on it thats probably better than the link I posted earlier.
Is it essentialy the case that by lowering VE through cam timing at peak TQ (maybe some overlap or something?)you can lower the propensity to knock? And is DCR basically a way to express that as a single easily managed number? Thats what I thought anyway.... Edit: And I got an A in Thermo. Because I am the man.....and because I only had two other engineering courses that semester........ |
DCR is a way for those familiar with motor geometry to approximate one of the many aspects of volumetric efficiency.
It is trying to say that real compression only occurs after the exhaust valves close, when in reality this is just a measure of exhaust cam timing, which affects VE. Other considerations are scavenging, intake cam timing, intake manifold design (helmholtz), head flow, exhaust, etc. VE and CR can be used in thermodynamic formulas to describe the power a motor makes. I'm not sure how you'd do the same with SCR and DCR... |
Sense of humor in this thread = none.
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I blame Stephanie Turner.
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I thought the only difference was the intake, cam, and the fact some of them used a different exhaust manifold (4-2-1) than what we used.
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Originally Posted by Full_Tilt_Boogie
(Post 539218)
Nothing fucking exists.
The only reason I can hit the keys on my keyboard is because the electrons in my fingers are repelling the electrons in my keys. Also, youre retarded and you smoke cock. No, you smoke cock and you r dum. That is "you r" not "your" or "you're". Two out of those three are correct. Jkav is one of the few authoritative hard-tech engineering members here and we don't need your dumb internet jockey ass chasing him off. Input from members like him are what makes this forum good. |
Originally Posted by faeflora
(Post 540142)
No, you smoke cock and you r dum. That is "you r" not "your" or "you're". Two out of those three are correct.
Jkav is one of the few authoritative hard-tech engineering members here and we don't need your dumb internet jockey ass chasing him off. Input from members like him are what makes this forum good. |
Originally Posted by gospeed81
(Post 539805)
DCR is a way for those familiar with motor geometry to approximate one of the many aspects of volumetric efficiency.
It is trying to say that real compression only occurs after the exhaust valves close, when in reality this is just a measure of exhaust cam timing, which affects VE. Other considerations are scavenging, intake cam timing, intake manifold design (helmholtz), head flow, exhaust, etc. VE and CR can be used in thermodynamic formulas to describe the power a motor makes. I'm not sure how you'd do the same with SCR and DCR... |
Originally Posted by jacob300zx
(Post 538646)
This motor has a couple of hot parts that only the jdm market recieved. I'm looking for a source for the motor, trans, harness, and ecu. Anyone know an importer that can get a hold of this combo? Just as an FYI the motor has a hot cam, better intake mani, higher comp, and better exhaust manifold. I'm seeing jdm Miata combo's pop up on ebay in the 1200 range just not the vvt version. The trans is not important but a nice bonus.
Someone find an importer! Can anyone CONFIRM if JDM VVT camshaft is different? If yes, what is there difference? Other info appears correct in that the JDM does have a better intake and higher comp. |
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