Re: [DMCForum] Re: B28E/F how to tell them apart?

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

>
> - Advanced base ignition time (with correspondingly lighter
> counterweight?)


Emissions are tested at idle.

>
>
> - Relocated alternator

No, thats where Renault put it.

>
> - Shallower oil pan

Nonsense - there are actually spacers on the oil pickup making the pan 
approx 1" deeper than the Renault ones.

>
>
> - Much richer fuel mixture (2% CO2)

No, the E was set up to 1.5% WE set up to 2% sometimes when the engine 
"likes" it. This is within tolerance. 2% co at idle does not constiture 
a "much richer" mixture. The mixture adjustment screw has very little 
effect higher in the rev range.

>
> - Series 038 CPR versus Series 066 -- closes much more slowly (~160
> degrees) and exerts slightly less counter pressure. Vacuum enrichment
> is *MUCH* simpler

And you never stopped to wonder WHY there are these differences. Believe 
me they didn't do it for the hell of it. Vacuum enrichment on the 038 is 
very slight - something like 0.2bar drop in control pressure - not even 
enough to read on a gas analyser at idle! The 066 drops control pressure 
by over 1 bar, and makes a big difference.

>
>
> You may have one of the Renault imports (Z7V) that apparently were
> being marketed out of Ohio in the late 80's. Differences from Volvo E
> series:
> - Aluminum fuel distributor with external balancing screws (don't mess
> with them)

Only on later ones.

>
> - Dampener between the CPR and the fuel distributor

That was a warrenty item, not on all engines.

> Z7V uses a one piece upper air assembly. Many more vacuum nipples &
> ports than Volvo, most of them capped off. CO2 screw access port is
> threaded and plugged with a washer base machine screw. 

That is actually there on the DeLorean engine, but the upper casting was 
not drilled out during assembly meangn you have to drill it out. The 
Volvos also have this screw

> No place to
> attach an idle microswitch. 

That's because it didn't use the idlespeed system!!!

Martin

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