Well, what enrichment systems are there (I'm intrigued by Jim's total of six, so let's add 'em up) 1) Warm up enrichment - the most basic function of the control pressure regulator 2) Cold start valve - extra shot of fuel when the engine's below a certain temperature, controlled by the thermotime switch on the top of the water pump. 3) Accelleration enrichment - vacuum fed to the CPR via delay valve lowers control pressure when vacuum is "lost", but only for a few seconds, and only when the engine's cold 4) Lambda system enrichment - firstly during warm up, which is not strictly enrichment because it's just waiting for the exhaust sensor to get hot enough. However, this state in a hot engine results in rich running which is why this is used for... 5) Full throttle enrichment - effectively puts the lambda ecu into "warm-up" mode. 6) Errm. Not sure. The B28E UK spec equivalent of the DeLorean engine did not have a cat or lambda system, so removing both and replacing with equivalent components yields pretty healthy power and torque gains. The CPR has constant accelleration enrichment, but to a lesser degree than the B28F. The ignition timing and fuelling curves differ and in the compromise of power, ecomony and emissions, where DeLorean leaned more towards economy and emissions, the B28E leans towards power. Martin content22207 wrote: > Actually the PRV runs quite well with absolutely no fuel enrichment > whatsoever. I know because that's how I took possession of my own > copy. Had fuel metering of course, but no enrichment beyond that. > > I am now running one enrichment mechanism only -- through the CPR (038 > series, much simpler than 066). > > Martin Gutkowski has also jetisoned most of his Lambda based > enrichment mechanisms with good results. > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/