I.Mupferit Posted May 19, 2003 Share Posted May 19, 2003 Am I right in thinking injector flow rates are identifiable by the colour of the injector and is this an industry standard or is the flow rate/colour peculiar to each manufacturer? I have seen injectors referred to by colour ie:- Green Cosworth for up to 'X' amount of power so was just wondering if that is how you identify the flow rate of that particular injector as they don't seem to have any other identifying marks on them. Brent Link to comment Share on other sites More sharing options...
John Howe Posted May 19, 2003 Share Posted May 19, 2003 Brent, can't help you colour coding but your might like to look at RC Engineering web site. http://www.rceng.com/technical.htm There are some helpful maths to working out required sizing and you may well find some help on the colour coding, as well. Good luck JH Deliveries by Saffron, the yellow 222bhp Sausage delivery machine Link to comment Share on other sites More sharing options...
Peter Carmichael Posted May 19, 2003 Share Posted May 19, 2003 I believe the colour refers to the Bosch injectors that are prevalent across the industry. Weber Pecos are popular for race engines where packaging is tight and don't conform to such colour markings. I have seen a very long list of injectors published before now but I don't have a link. In case you need to benchmark a flow rate for your target power, I was running my pecos (330 cc/min @3 bar) at 4 bar and 91% duty cycle to achieve 250ish horsepower. The effect of the pressure change would have made them equivalent to 380 cc/min. I uprated the fuel pump to the JPE item to keep them properly supplied at this pressure. If you do the calculation of: 4 injectors 380cc/min 1.34l/kg 91% duty 250hp You get close to the rule of thumb figure of 0.5lb/hour/hp although I have exceeded the recommended max of 80% duty cycle. Edited by - Peter Carmichael on 19 May 2003 17:03:11 Link to comment Share on other sites More sharing options...
Rob Walker Posted May 19, 2003 Share Posted May 19, 2003 Colour coding is no indication of capacity or flow rate. It is specified by the customer and Bosch will produce whatever they are asked to produce, so don`t think all dark green or bright red injectors are high flow they are not. Link to comment Share on other sites More sharing options...
I.Mupferit Posted May 19, 2003 Author Share Posted May 19, 2003 Hmmmm, so how do you determine the rating of the injector if there is no manufacturer (ie Ford, Vauxhall etc) identification on it? Brent Link to comment Share on other sites More sharing options...
Peter Carmichael Posted May 20, 2003 Share Posted May 20, 2003 You attach it to your regulated fuel rail and run it permanently open into a bucket for a minute and measure the amount of fuel. Link to comment Share on other sites More sharing options...
I.Mupferit Posted May 20, 2003 Author Share Posted May 20, 2003 Ah, I thought it would be a tad more scientific than that but if that's the only practical way then so be it. Thanks Brent Link to comment Share on other sites More sharing options...
Jason Plato Posted May 20, 2003 Share Posted May 20, 2003 Without wishing to state the obvious , try starting your selection by matching the power output of a manufacturers car to that which you are expecting . A Saab turbo at 250 bhp or vauxhall turbo could be a worth a look ?? Dave Link to comment Share on other sites More sharing options...
stevefoster Posted May 20, 2003 Share Posted May 20, 2003 Brent. I have a spare set of buff ones with a known flow rate at 50psi. These were on a 230'ish VX. It ran different fuel gain to mine. Mine is set to 74. That was set to 120. Same injectors. If you test yours and mine are 'flowier' then you can borrow them... My racing pics, 7 DIY, race prep. Updated often here Photo's of the year here Hants (North) and Berkshire Area club site here Edited by - stevefoster on 20 May 2003 08:36:15 Link to comment Share on other sites More sharing options...
Rob Walker Posted May 20, 2003 Share Posted May 20, 2003 There are many other factors other than simply flow rate to consider when choosing an injector. Impedance, Spray pattern and fequency that they can be switched on and off. If your considering Bosch injectors then try their technical Help line . In general if you want high capacity injectors then look for injectors off a turbo car. The reason being that the injector is being fired into say 1 bar pressure within the manifold and therefore requires a greater capacity over its NA counterpart to flow the same amount of fuel. Link to comment Share on other sites More sharing options...
I.Mupferit Posted May 20, 2003 Author Share Posted May 20, 2003 I hadn't realised that injector selection was so involved! Steve, depending on how it works out over the next couple of days testing, maybe I could borrow your injectors please to compare alongside my present ones. What exactly do you mean by the fuel gain on the injectors? It seems I have a lot to learn about this injection lark. BTW, I have the NBPS back so I can drop that around to you this week together with the pressure gauge Brent Link to comment Share on other sites More sharing options...
stevefoster Posted May 20, 2003 Share Posted May 20, 2003 The fuel gain is a setting in the MBE FI management system. Not sure exactly how it works. But by deduction an engine in a higher state of tune using the same injectors had a higher setting. So increasing it should fuel more or for longer since injectors are binary. If there is a similar one in the Emerald system (someone here must know). You are welcome to the injectors anytime until the next race meeting (7th June) as I take them as spares... My racing pics, 7 DIY, race prep. Updated often here Photo's of the year here Hants (North) and Berkshire Area club site here Edited by - stevefoster on 20 May 2003 10:50:22 Link to comment Share on other sites More sharing options...
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