Date: Mon, 6 May 2002 08:30:42 -0400
Reply-To: Robert Donalds <bostneng@FCL-US.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Robert Donalds <bostneng@FCL-US.NET>
Subject: Re: Main Engine Bearings
Content-Type: text/plain; charset="iso-8859-1"
The valve seats I use in the big valve engine are made from the same
material as seats I use for the propane engines I build. These seat take
more heat due to the fact that they are not heat treated and have a higher
nickel content. I also rebuild the con rods and use new 1.9 bolts as I feel
the reason for the rod distortion has been the stetch to yeld fastners used
in the 2.1 engines.
My early and incomplete chassis dyno testing indicated that the torque is
in the low 80s from 3400 rpm threw 4500 rpm and only drop about 3 pds at
4800 rpm with a cat and early 1.9 intake system So can you go faster than
70 with a big valve engine yes I do in 84 van and I have seen no oil light
flicker and no sign of valve resession . The gas milage has been in the 19
20 21 mpg range at speeds of 70 to 80 mph
more testing soon with 2.1 intake system
B. Bob
----- Original Message -----
From: "Mark Dorm" <mark_hb@hotmail.com>
To: <bostneng@FCL-US.NET>; <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, May 05, 2002 7:05 PM
Subject: Re: Main Engine Bearings
> So Bob, even if I had your Big Valve Engine Option III, you would still
keep
> 70 mph as your maximum sustained speed. And if a rod is distorted can you
> replace individual rods? Sorry for my mechanical ignorance, I'm learning
> though. Finally bought a Bently. I'm interested in your big valve option,
> but I'm gonna have to make some money. Whats the turn around and
> installation price if I were in your neighborhood?
>
>
> >From: Robert Donalds <bostneng@FCL-US.NET>
>
> >Mark
> >
> >the 2.1 engines with over 130k miles have issues with the big end of the
> >rod distorting and throwing rods one of the symtoms is low oil pressure
at
> >warm idle. http://www.bostonengine.com/articles/low-oil-pressure.htm
doing
> >80 with an older 2.1 is not recomended I would say that 70 is the max
> >sustained speed for a van engine. That is 4000 RPM its about the same std
> >and auto trany.The WBX engines I have taken apart over the years have
some
> >comon problems exhaust valve seats that are pounded is one I think to
much
> >sustained RPM is one reason for this.
> >
> >Bob
> >
> >Mark wrote
> > I was driving down Interstate 5 heading due south, going about 80 mph,
> >saw
> >a gas station, decided to exit when at that moment the buzzer went on.
> >Water
> >temperature wasn't higher than the top of the led itself. I turned the
> >engine off, and coasted down the road, into the denny's parking lot next
to
> >the gas station. Let it cool, let my mind run wild. Added more than half
of
> >a bottle of gunk. Wasn't low on any fluids. After a few hours, I started,
> >it
> >ran, and I drove 60/65 mph all the way to Riverside. No problems since
> >then.
> >Thinking is, oil got hot which made it thin out which caused the oil
> >pressure to drop. It wasn't that hot that day. Is this just a day in the
> >life, or is it an omen?
>
>
>
>
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