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Old 05-11-2009, 06:26 AM
72fordlb's Avatar
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wet or dry??????

I know this might be a dumb question but what is the differents between dry slump and wet slump oil systems, oh and in the nos world what is the differents between wet shot and dry shot.
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Old 05-11-2009, 06:57 AM
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Wet sump systems typically refer to carrying the oil in the pan and pumping it through a normal style oil pump. Dry sumps typically have an oil reservoir and pumps to pump the oil from the tank to the engine and another to scavenge it from the pan (usually a short vestigal pan) and return it to the tank. Many early bikes( Harleys still) had dry sump systems. The big advantage is that it is less susceptible to high cornering loads and if the engine should blow there is minimal oil belched onto the track. As far as NOS, one system just injects the NOS, the other injects the NOS with extra fuel to compensate for the leaning out that NOS produces in the combustion chamber. I haven't paid much attention to NOS for many years but didn't realize there were still dry systems. When it was first experimented with there were many engines that were trashed from melted pistons when the NOS was triggered causing such a lean burn that it literally melted pistons into lumps.
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