[DML] Re: PRV Performance - Set me straight please

["Rick" <rdevaux@xxxxxxxxx>]

Bill, Base timing is 10 degrees.  PCV is complete and well-
functioning.  What's your experience with what Greg suggests, that 
the Lambda closed loop can be adjusted for better performance beyond 
Lambda=1?  If that's possible, why do European PRVs not have Lambda 
systems?  My Volvo does not require emmissions testing and will 
eventually lose the cat.  But if there's a benefit to maintaining the 
Lambda for driveability and it can be adjusted for performance, I'm 
all ears.  My experience is the frequency valves can go out and do 
become a driveability issue until replaced.  Thanks, Rick

--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
wrote:
> 
> 
> (Comments apply to DeLorean PRV as well...)
> 
> If you have an opportunity to increase compression, go for it.
> Provides the same benefits as forced induction without all the
> complications. PRV's can obviously handle 9.5:1 no problem (in the
> B280 redesign, compression was even increased to 10:1). Just make 
sure
> your pistons match the liners.
> 
> Also go for the highest cam lift possible. Will pull maximum mixture
> into the cylinders.
> 
> Make sure your engine DOES have PCV connected. Not only ensures that
> damaging internal pressures do not build up, but goes a long way
> towards avoiding sludge under the valve covers. If you've got the
> breather hose connected but not the calibrated nipple, you are
> probably sucking oil backwards into the intake. 
> 
> I believe the dual barb spark advance is Volvo's attempt to avoid 
over
> advancing ignition (what is base time on your EPA sticker?). Ford 
did
> the same thing in the 1970's when base time was advanced all the way
> to 16 degrees. Under certain conditions vacuum is shot to both 
barbs,





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