Toymods Car Club Inc: Tech & Conversions => 3SGTE idling problem Need info on EGR

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RWDboy
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South Australia
Registered:
July 2002

Re: 3SGTE idling problem Need info on EGR	Wed, 25 May 2005 15:30

When I think about it - it is possible that you will get pre-detonation without EGR, but it'd have to be a pretty knife-edge tuned engine (A/F ratio wise) to begin with. Main issue would be the temperature at the piston crown and the piston retaining too much heat. Anyway as you are no longer re-introducing heated matter into the intake charge the engine will deal with waste heat much better. All the heat in the exhaust gases will go out the exhaust. By not re-introducing heat into the charge the engine will probably deal with it's heat alot better....like I said though the flame front temperature might be hotter without the inert matter (EGR) in the intake charge, and the flame front doesn't stay near the spark plug for particularly long - in fact it tends to go away from the spark plug towards el piston The piston crown temperature might get slightly higher during combustion, but hopefully in an overall sense it won't change by a great deal as the period of cooling is longer, the period where it gets heated up is shorter (faster combustion) and the intake charge will also be slightly cooler than usual. In terms of tuning without the EGR, I guess you probably would richen the mixture slightly to slow the flame front propagation (for power purposes) and to reduce the temperature at the piston crown to a more 'stock' level. EGR has long been used to reduce the toxicity of emissions (via absorbing heat and slowing flame front propogation), improvements in fuel economy (at times it was used to fine tune the A/F ratio in older cars) and to accomodate the idea of a lean-burn engine - in fact Toyota did alot of research into this using multi-port, direct injection and other doo-flickeys like intake swirl bollocks. EGR is a very good solution to the problem of emissions and fuel economy....the other good option is water injection - but you end up consuming water rather than just recirculating spent gas (recycling is good - eh?). [Report message to a moderator]

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