From: Gerry Davison (gerry@marlab.dk)
Date: Mon Mar 04 2002 - 11:45:05 PST
Hi Cor
Yes, the lead definitely has a purpose, it allows the octane number to be
increased without "knocking". But most military vehicles of the early 40's
were designed for 70 Octane, which was the best you could find in general
use in 1940. The use of lead was a German invention to allow them to
increase the octane rating of fuel for their fighters, and it indeed
worked - for a while until the secret was discovered by the allies. So for
higher octane engines like those in modern cars, there is a definite
advantage to performance in using leaded contra unleaded petrol. In engines
from the early 40's though, it really doesn't matter at all.
Regards
Gerry
----- Oprindelig meddelelse -----
Fra: "Cor Streutjens" <cstreutjens@hotmail.com>
Til: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sendt: 4. marts 2002 19:43
Emne: [MV] Leased versus unleaded fuel.
>
> List,
>
> Just read the message below. Point is that one of the dealers of military
> vehicles I know runs his Nekaf M38A1s, Willys MBs and Hotchkisses (this is
> the Netherlands) on unleaded fuel. No hardened valves or valve seats in
his
> engines he said. He told me he has done so for over 20 years and has never
> experienced any damage to the engines.
> I am new to the art of keeping a mil veh om the road and am willing to
> listen to the fellow who has more knowledge of the subject than I do. This
> includes (nearly?) all fellow list members by the way for which I express
> thanks. Personally I believe that the lead in the fuel definitely has its
> function and cannot be left out without consequences. What must I do?
> Another subject is engine oil. Can I use mineral oil with dopes like 25W40
> in my 1956 Nekaf M38A1 or is it better to use the 2 kinds of oil without
> dopes for summer and winter like the 1963 manual says?
>
> Appreciate all help.
>
>
> Thanks,
>
> Cor
> 1956 M38A1
>
> >From: "Richard Lathrop" <lathrrs@snip.net>
> >To: <mil-veh@mil-veh.org> (Military Vehicles Mailing List)
> >Subject: Re: [MV] Introduction
> >Date: Mon, 4 Mar 2002 10:37:26 -0500
> >
> >Gerry,
> >Welcome back!
> >
> >That has been a much discussed subject on the Dodge Power Wagon Forum in
> >the past as well. I know that the lead additive provided lubrication for
> >the valves.
> >
> >I am sure there are others (Cougarjack comes to mind) that can give us a
> >very detailed technical explanation of lead additives and its effect on
> >flathead engines.
> >
> >This thread would apply to most other flathead engines as well.
> >
> >Rick
> >
> >
> >
> >
> >---------- Original Message ----------------------------------
> >From: "Gordon.W.I. McMillan" <gwim2@student.open.ac.uk>
> >Date: Mon, 04 Mar 2002 15:33:31 +0000
> >
> > >We remember you Gerry, we have long memories here..... 8-)
> > >
> > >Did Betty ever suffer from running on unleaded ? Someone asked
recently
> > >on the WW2 Dodge Forum;
> > >
> > >http://disc.server.com/Indices/118969.html
> > >
> > > if you could run one of those Chrysler flatheads long term on unleaded
> > >with no problems. I said you should be able to since they had hardened
> > >exhaust valve seats but I wasn't sure, and I know Betty did more milage
> >on
> > >unleaded than most.
> > >
> > >Gordon
> > >
> > >
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>
>
>
> Drs. C. Streutjens
> Technisch Applicatie Consultant SAP
> Pinkroccade Industrious
> Tel 06 2952 4968
> c.streutjens@ind.pinkroccade.nl
> cstreutjens@hotmail.com
>
>
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