Re: [DML] DeLorean vs Volvo F Series Question
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [DML] DeLorean vs Volvo F Series Question



"As we all know"? Bill, you expect too much from some of us ;-)

Judging from the way the tech manual is written, it looks to me like
they were very concerned with U-S emission controls. A lot of the
sentences contain language like "thus reducing hydrocarbon emissions"
... *shrug*

Of course, it's entirely possible that they "over-built" things
because of worry or some other reason. I'd guess that it's a matter of
opinion. I would probably appreciate making things simpler, but that's
probably because I'm not a skilled mechanic! I think I have to
understand *why* something works (or doesn't) before I go about
fiddling with it. Obviously you know what you're doing. For the most
part, I don't. :P But I also would like more information on this,
please! Come on, group! It's not Mardi Gras everywhere, is it? ;-)

Farrar Hudkins
#2613

On 2/5/08, content22207 <brobertson@xxxxxxxxxxxx> wrote:
> I am corresponding with an owner Re: spark advance. As we all know,
> DMC decided to use only one centrifugal counterweight inside its
> distributors rather than two (Volvo used two on its imports to the
> exact same North American market). To compensate, DMC:
> - Bumped base ignition time from 10 to 13 degrees BTDC
> - Ran full manifold vacuum rather than ported vacuum to the advance
> diaphragm
>
> This oOf course leads to generally overadvanced ignition, so for
> better starting and cold engine performance DMC further:
> - Ran its vacuum through a thermactor valve and an idle cutoff
> solenoid before the distributor
>
> My question: Why did DMC find it necessary to reinvent the spark
> advance wheel?
>
> B28F has two centrifugal counterweights, 10 degree base ignition time
> (steeper advance curve), and only one vacuum line from a ported barb
> under the throttle plates directly to the advance diaphragm. What
> could be simpler?
>
> And again: Volvo imported its setup into the exact same North American
> markets, during the exact same time period (1981-1983). If their setup
> was good enough for the US government, shouldn't DMC have been able to
> use it too?
>
> BTW: US Volvos also came with a Y pipe and single catalytic converter.
> They used Lambda as well.
>
> More engineering from Dunmurry that causes me to scratch my head.


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/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/dmcnews/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:dmcnews-digest@xxxxxxxxxxxxxxx 
    mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx

<*> 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/
 


Home Back to the Home of PROJECT VIXEN


Copyright 2006 ProjectVixen.com.  All rights reserved.

Opinions expressed in posts reflect the views of their respective authors.
DMCForum Mailing List Archive  DMCNews Mailing List Archive  DMC-UK Mailing List Archive