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| 300WHP Supernatural 3.XX Coming Soon! (Page 41/54) |
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Blacktree
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MAY 22, 11:34 AM
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| quote | | Originally posted by La fiera: ... they feed the opposite side. I was able to locate them 7 inches higher up for better atomization and to absorb heat from the incoming air. |
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The Falconer intake does that too, probably for the same reason. The injectors are high up in the manifold.
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La fiera
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MAY 22, 08:14 PM
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| quote | Originally posted by Blacktree:
The Falconer intake does that too, probably for the same reason. The injectors are high up in the manifold. |
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Yep, Google University graduates know nothing about this, they just follow trends. Most of the time I have to go back in time to leap miles and years fordward!
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ericjon262
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MAY 22, 08:24 PM
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| quote | Originally posted by La fiera:
Yep, Google University graduates know nothing about this, they just follow trends. Most of the time I have to go back in time to leap miles and years fordward! |
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injector placement is an interesting topic, the further away you are, the more cooling, the closer you are, the higher the accuracy of the supplied fuel. the trick is finding the middle ground that works for each application, and the ever important packaging problem, it has to fit on the engine to work!------------------
"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
cognita semper
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Will
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MAY 23, 10:20 AM
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| quote | Originally posted by ericjon262:
injector placement is an interesting topic, the further away you are, the more cooling, the closer you are, the higher the accuracy of the supplied fuel. the trick is finding the middle ground that works for each application, and the ever important packaging problem, it has to fit on the engine to work!
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Shower injectors above per-cylinder throttles have long been the way for high RPM engines... but that doesn't work for OEM emissions and drivability needs.
Highly optimized racing carbs deliver better mixture *quality*, in terms of mixture homogeneity and dropley size, than port EFI, although port EFI has superior metering and mixture ratio control.
Most port injectors shoot one or more streams rather than a shower or spray of droplets. The need for better atomization in direct injection applications drives 4 digit fuel pressures.
So with large upstream injectors, theoretically there's a sweet spot for injection timing that results in all the fuel injected getting trapped in the cylinder on a cycle-by-cycle basis, rather than averaged across multiple cycles. This window is easy to hit with port injection, but increasingly offset from the valve events as the injector goes further upstream.
In addition, even with stoichiometric combustion in the chamber, an engine with a lot of overlap that traps all the fuel in the chamber will show lean on an EGO sensor because it's sending air out the exhaust port.[This message has been edited by Will (edited 05-23-2021).]
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fishsticks
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MAY 23, 11:06 AM
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Don't forget that the longer you can keep fuel in the plenum/runner, the more air charge cooling it can do.
Rei, ever thought about doing ITBs? It'd be a packaging nightmare, but you're already into tall intakes. 
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La fiera
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MAY 23, 04:59 PM
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| quote | Originally posted by fishsticks:
Rei, ever thought about doing ITBs? It'd be a packaging nightmare, but you're already into tall intakes. |
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That's in the drawing board. Meantime the intake for the "9,000RPM Supernatural" is almost finished.
It's the SR1 Supernatural intake which I dubbed as "Meet the fogger", the nickname implies its purpose. 
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Will
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MAY 23, 08:23 PM
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Have you ever just tried a Falconer intake?
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lou_dias
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MAY 24, 07:34 AM
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...eventually Rei will design a Smokey Yunick V6...
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La fiera
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MAY 28, 08:47 PM
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Did a compression test today after some miles on the rings and all cylinders are right at 235psi, the 3.4L was about 218psi. The 3.4L had a 244@.050 duration cam and the 3.7L has a 250@ .050 cam. Even bleeding more compression with a bigger cam the 3.7L is looking to my spectations! Bone cold engine. [This message has been edited by La fiera (edited 05-28-2021).]
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Blacktree
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MAY 29, 11:54 AM
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Just out of curiosity, what's the static compression ratio?
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