Re: [DML] Re: Brass Manifold Screws

[Martin Gutkowski <webmaster@xxxxxxxxxxxxxx>]

You're half right. Renault certainly DID employ CIS on later models of 
their PRVs, my "bible" is the Renault K-Jet manual describing all manner 
of permutations of different forms of the PRV's Injection, ignition, 
fuel and idlespeed systems. I have fantastically thorough fault 
diagnosis pages (eg proper pin-outs on idlespeed computer), cutaway 
views of the metering head and full explanations of all the system parts 
and how to adjust them _properly_.

The brass screws on the Volvo 760 are not shear type, the engine has CIS 
and the Volvos were set up correctly allowing proper balancing of the 
banks. Renault also describe the procedure. The DeLorean manual is a 
simplified system but does not give as much flexibility as is sometimes 
needed when factory tolerances are not quite spot on (eg centre position 
of idlespeed valve). As well as preventing the engine from ever being 
proerly "fine tuned". The ports are there o the exhaust to achieve it.

Continued blind acceptance of the DeLorean manual as gospel regarding 
the idlespeed screws is quite simply wrong. The fine adjustment is so 
fine in most cases that it makes no noticable difference, but for one 
car in five, a proper set up of the screws results in a smoother more 
reliable idle.

Martin
DMUK

content22207 wrote:

>Note also that Renault never adopted CIS -- it never used shear head
>style balancing screws. 
>
>Interestingly, last weekend I bought an upper air assembly from a 1989
>B28F that, although CIS equipped, did NOT have shear head balancing
>screws. Either Volvo itself or a previous owner had adopted John
>Hervey's philosophy by the end of the decade.
>
>Bill Robertson
>#5939
>  
>
>  
>





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