Re: [DML] Re: PRV Fuel Enrichment

[Martin Gutkowski <webmaster@xxxxxxxxxxxxxx>]

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.
> 





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