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ff REMEDIATION SERVICE. INT'L <br /> RSI SYSTEM BLOWER CURVES <br /> Basic S A V E system - 4 or 6 cylinder with Roots RAI 33 <br /> Positive displacement blower <br /> ' Total air flow and system vacuum are dependent upon several <br /> factors , to include, but not limited to, air abatement <br /> requirements, site elevation, engine work load and rpm. Assuming <br /> the positive displacement blower was fully bypassed (not super- <br /> charging the engine) then total air flow through the engine can <br /> be calculated as follows <br /> scfm = (rpm x encr displacement) (e <br /> ' (2 x 1728) <br /> ' "e" is equal to a factor for vacuum loss due to inefficiencies <br /> and is variable from site to site We use 75% on average for <br /> figuring total flow capacity Therefore , average air processed <br /> through a four cylinder engine, 140 cubic inch displacement <br /> (CID) , at 2 , 000 rpm is 60 scfm Average air processed through a <br /> six cylinder (300 C I D ) engine under same operating conditions <br /> would be 130 scfm. If no air abatement is required, the RAI <br /> ' 33 blower can produce 150 scfm @ 14" Hg, venting direct to <br /> atmosphere <br /> ' By adding a positive displacement blower in series with the <br /> engine (supercharging the engine) , efficiencies can be increased, <br /> therefore , allowing additional air to be processed Exactly <br /> how much air and at what psi is site specific The positive <br /> displacement blower is also used to compensate for site <br /> conaitions to allow the engine to operate at best operating <br /> parameters <br /> ' Attacnea you will find engine performance curve (s) as published <br /> by Fora Motor Company (detailing rpm/brakehorse power - air flow <br /> ' not available) and a Roots RAI 33 blower curve <br /> S A V E II - High Flow Cat-Ox <br /> ' Off gasses are processed througn a catalyst designed for a <br /> maximum throughput capacity of 300 scfm Please refer to ROOTS <br /> ' RAI 36 blower curve attached <br />