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Date: Wed, 22 Sep 1999 18:54:58 -0500
From: Tom Trueb <ttruebnopsamstunas.org>
Subject: Re: Re- water injcion (injection ?)


supersambanopsameja.com wrote: > > In article <hex-ya02408000R1609992336050001nopsam.u-net.com>, > hexnopsamction.co.uk (werner) wrote: > > Many thanks for the advice - it seems I will be having to go back to > the > > drawing board slightly as far as a direct jet into the compressor is > > concerned. If I can get a suitable jet to be making a spray pattern > then > > perhaps not so bad. If I have to inject after the turbo then I will be > > needing much stronger pressure pump and also pressure regulation as in > the > > fuel rail. This will be making for it to be more complicated and so > on. I > > am not looking to have more than stock boost levels only to replace > the > > inefficency of the intercooler and fuel enrichment. So there you have > it - > > any ideas for a low pressure spraying nozzle?. > > > > Werner > The inefficency of the intercooler is related to its position in the > car. I have put an air scoop under the front bumper to help with the air > flow onto the intercooler but even so I estimate around 1400 cfm at 100 > kph. If you put a custom made intercooler behind the grill (in front of > the radiator) you will get around 4500 cfm onto the cooler. This is the > way to go. Using water alone to cool the inlet charge is not a good > idea. Think about how fast the wind screen wash pump, pumps water. > A while ago I tried it since I have put the headlight wash sprays onto > the intercooler for extra cooling power (not inside it). I think one jet > can fill a cup of water in around 15 seconds! At that rate you will be > constantly filling up. Water injection was of course used as an option > on the 99 turbo and thankfully has not been used in that way since. It > is used nowadays on cars like the escort cosworth but in that case the > sprays are just before the fuel injectors and are supplied of course by > a high pressure pump. A sizeable air-air intercooler is of course also > used. Unless you want more power I can see no reason in altering what > you already have, any efficiency gains are likely to amount to no more > than a couple of BHP. > Neil. > > Sent via Deja.com http://www.deja.com/ > Share what you know. Learn what you don't. FWIW, I just heard a neat old-fashioned idea on BMW MC group. You put an aquarium water stone in the air flow attached to a bottle of water (lower than the stone). Reportedly, it injects more of a vapor than a mist. Tom

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