David Sparkes Posted October 29, 2008 Share Posted October 29, 2008 The November 2008 issue of Practical Performance Car (Performance tuning for grown-ups, it says here) has a 3 page article on building and using one of these, on a very low budget, although how low does depend on what you have available to hand. My paper subscription copy of the magazine came today, they don't do an internet version, so you will have to go and find your own copy in the paper shop of your choice. If you are, or intend to, work with secondhand injectors, or just very old ones, this seems like a darned good idea. This isn't just a static device. The article includes a circuit for a Pulse Width Modulation circuit to drive the injectors while pushing fluid through them. Just to make it clear, this is for use with electrically controlled injectors, not the hydraulically controlled ones, such as on my BMW 38A, or the 200 / 300 TDi engines. HTH Quote Link to comment Share on other sites More sharing options...
Mark Posted October 29, 2008 Share Posted October 29, 2008 PPC is available in tesco's in case anyone is having trouble finding it. It is an excellent magazine, and pretty much the only one I buy these days - far batter than any of the LR mags. Quote Link to comment Share on other sites More sharing options...
Guest WALFY Posted October 29, 2008 Share Posted October 29, 2008 I was on the understanding that 200/300 injectors were 2 stage so had to be tested by a specialist with the guchi kit. If that's not the case I assume a lot of inj have been thrown away needlessly Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 29, 2008 Share Posted October 29, 2008 Thankyou for this david, I'll be popping in on the way home via tescos ! Nige Quote Link to comment Share on other sites More sharing options...
Raumer Posted October 29, 2008 Share Posted October 29, 2008 Is this for testing common rail injectors? The TD5 injectors need a rig with cam drive and rockers. And they have to run at reasonable pressures. Might have to pick up a copy. Ed Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted October 29, 2008 Author Share Posted October 29, 2008 Is this for testing common rail injectors? The TD5 injectors need a rig with cam drive and rockers. And they have to run at reasonable pressures. Might have to pick up a copy.Ed Yes to the common rail injector question, although it's really 'what do you want to do?'. It's 'your' electronic control, so you can fire them all at once, or independently if you want. I perhaps have provided a 'wrong direction' with my comment which only mentioned diesel injectors. The writer of the article, and 99.9% of the magazine, is about petrol engined vehicles, so petrol injectors in this case. There is no mention of a cam drive etc to get the very high pressures used on TD5 (diesel) injectors. Cheers Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted October 29, 2008 Author Share Posted October 29, 2008 I was on the understanding that 200/300 injectors were 2 stage so had to be tested by a specialist with the guchi kit. If that's not the case I assume a lot of inj have been thrown away needlessly I perhaps have provided a 'wrong direction' with my comment which only mentioned diesel injectors. The writer of the article, and 99.9% of the magazine, is about petrol engined vehicles, so petrol injectors in this case. The article built the test rig, described cleaning the injectors without flowing fluid through them, then measured the flow (and visually assessed the spray) using cleaning fluid. Now you ask ... I'm not sure that multi-stage injectors are multi staged within themselves, or whether they just respond to multiple pulses. If the latter, the PWM control is adjustable, so it should be possible to assess response to very short duration pulses. Most injector testing appears to be 'can it flow the correct amount when held fully open?'. Too little indicates a blocked injector, too much indicates an injector with a poor spray pattern (from comments in other articles). You had me going with your comment about the 300 TDi injectors, so I've just been back to a Defender Workshop Manual. There is NO electrical connection to the injector, so the rig in the article is not applicable, as I said initially. I understand some TDi engines have electrical connections to the pump, to control the fuel pulse there, but direct control of the injector is by the pressurised fuel pulse. HTH. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 29, 2008 Share Posted October 29, 2008 Oh Pooo Tescos Liphook sold out David this is all your fault advertising this Mmmmm next nearest Tescos is........... ? Nige Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted October 29, 2008 Author Share Posted October 29, 2008 Tescos Liphook sold outDavid this is all your fault advertising this Mmmmm next nearest Tescos is........... ? Nige Nige Just remember I am reading my subscription copy of the magazine, delivered by post today. The shop copies of the NOVEMBER issue may not have been delivered to the shops yet. Good Luck. Quote Link to comment Share on other sites More sharing options...
Turbocharger Posted October 29, 2008 Share Posted October 29, 2008 SWMBO bought me a subscription for Christmas - the gift that keeps on giving. The new one landed on the doormat today and I have to say, I take it and no LR mags any more. I'll wait and see the fallout of the Scorpion demise before picking up an LR mag again to see the effect of no advertising revenue. On the fuel injector article, it's for electrically driven injectors only and of interest to the stuttering vapourwagons on here. Please be aware that diesel injectors are very nasty if you put yourself on the business end, and they'll inject diesel through skin and generally make you rather unwell. Quote Link to comment Share on other sites More sharing options...
Madcowz Posted October 29, 2008 Share Posted October 29, 2008 I always used to get Car mechanics magazine until my local newsagent stopped stocking so they could fit more gossip mags and trash. Always enjoyed reading it. Might ask for a sub as a Christmas present. http://www.carmechanicsmag.co.uk/ Quote Link to comment Share on other sites More sharing options...
Pete Attryde Posted October 30, 2008 Share Posted October 30, 2008 <Snip>Mmmmm next nearest Tescos is........... ? Nige<snip> Weyhill! Pete. Quote Link to comment Share on other sites More sharing options...
Mark Posted October 30, 2008 Share Posted October 30, 2008 Err, meant to mention it is usually published on the last Thursday of the month..... slightly premature there nige... sorry. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 30, 2008 Share Posted October 30, 2008 Rushed in Bought the mag - gotn home wrong mag FFS Anyone looking for it - its this one : http://www.ppcmag.co.uk/issue.asp?issue=98 Tommorow is yet another day to go see nige Quote Link to comment Share on other sites More sharing options...
hairyone Posted November 14, 2008 Share Posted November 14, 2008 Just been on the phone to my mate and college chum and he said he has recently written some articles for PPC. I said I that there was a good arcticle on a fuel injector test rig, he said "I wrote that". We both studied Mech.Eng. and he went on to become a bit iof an expert of fuel injectors and has worked for Delphi fuel injection. I told him about the thread here and he might be tempted de-lurk and answer some questions. I think he mentioned that TD5 injectors could be tested with bits from an SP36 injector tester (or that they can be found in scrap yards) Some pics of his handywork outside his lockup. SP36Brochure.pdf Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 14, 2008 Share Posted November 14, 2008 For petrol injectors I've just found this new (and very cheap) injectors tester from the guys that do MegaSquirt: Jectorate fuel injector tester Quote Link to comment Share on other sites More sharing options...
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