Nitrous delivery question...
Nitrous delivery question...
(OP)
I am more or less in the process of designing a nitrous delivery plate for a certain car. I am currently studying other companies plates and came up with a question. on spray bar setups, what kind of line do they use for the spray bar. it seems they use brass. i was wondering why they dont use stainless steel. will somthing like 1/8 stainless break line be effective? it has to stand up to the pressures of a break system which surly exceed that of which a nitrous system sees (1,200 PSI max). do they use it to keep cost down or is there somthing i am mimssing. also. assuming your supply is from one end and you have tiny holes along the bar, would one run into a distrobution problem? most companies only feed from one end but that is only going across 4 inches of carb or so. i will be crossing 6-8 inches. same question applies to the fuel bar... thank you for any advice you have. sorry for so many questions





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-b
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keep in mind that nitrous is somwhere around 192 below zero when it exits. does brass had any benifits at these temps?
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Regards
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
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Have fun.
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that is why i had my question about having a second bar for fuel above the nitrous bar. at lease that is what i THINK other companies do
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Also, make sure the nitrous holes aren't pointing towards the throttle :)
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MS
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you bring up a very good point about the hole as size of them. is there any way short of just experimenting with it on my engine?
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I would drill very slowly with a sharp drill to minimise burs inside the bar.
I would try to have some sort of snug fitting mandrel inside the bar as I drilled, or I would try to have a device to remove the burs, like maybe a long series drill the same dia as the inside bore of the bar.
You could test by flowing water through it and measuring the output from various jets by collecting into individual containers.
It would offer some advantage if you inject the nitrous and the fuel downstream from the inter-cooler as the inter-cooler will remove more heat from the hotter charge which can then be further cooled by the nitrous.
You will need to do something to the fuel enrichment system to correct for manifold pressure as the manifold pressure will be a bigger fraction of the fuel pressure than it is of the nitrous pressure.
Do you know what cross sectional area of nitrous vs fuel enrichment is required.
Do you have or can you get or borrow various commercially available systems so you can count and measure holes and compare them to performance. You might need to do this in a pressure regulated chamber to replicate manifold pressure.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Nitrous delivery question...
injecting below the is pretty much out of the question without resorting to a direct port nitrous setup which would defeat the purpose of me desinging the plate.. trust i have tried and it is just not workable.
please explain further about the fuel enrichment. are you talking about how the fuel pressure will stay the same but the boost will increas thus lowering the output of the fuel? being as that it is a roots style system, when you go WOT the boost is instant and it stays there. I was thinking that i could use this to my advantage. tuning my jet to be 11.5-12.0 when the boost is on. and when you go WOT at first the boost will take a second and the system will rich untill the boot catchs up thus eliminating the lean condition that wet kits are known for. maybe i am wrong?
thank you for your time
RE: Nitrous delivery question...
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Nitrous delivery question...
the pain here will be if i plan on marketing this kit i will have to have a jet chart for every possible boost level :( can you think of any other way. i thought of an FMU but that will mess with the factory tune. and the sole purpose of poeple buying wet kits is they dont have to get tunes for them. i may have to just sell them as a dry kit if i cant figure somthing out.
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To do that you will need a high pressure fuel pump and a manifold pressure sensitive fuel pressure regulator.
I believe this is common with turbo setups and normally involves a spring and diaphragm controlled valve as the pressure regulator with a fitting to plumb manifold pressure in over the diaphragm to assist the spring.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.