[DMCForum] Re: B280 Compression Spec (Carter)

["cartermartin" <cartermartin@xxxxxxxxx>]

Yep the B280F is a 9.5 to 1 or so compression. B280E (European 
version) is a bit higher.

That would be a good idea if Martin can find a B280E. A bit more 
power. 

Has anyone turbocharged a B280? I'm sure someone has tried.

I'll keep my an eye out for the fall show. 

Carter

--- In DMCForum@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
wrote:
> Oh great -- Volvo must have dumbed down the B280 for North American
> import. Euro spec is 10.5:1, which would be much closer to 180 PSI. 
I
> guess you're 9.5:1 -- same as Chrysler 3.0. Why our government 
insists
> sacrificing otherwise fine engine designs on the EPA altar is 
beyond me.
> 
> Perhaps you should get Martin to rustle you up a European B280 (he
> could replace anything you want before shipping it over). Would
> probably perform similarly to a turbocharged F series.
> 
> Don't hold my feet to the fire on Lake Lanier. SEDOC's been held 
there
> three times already, so I'm just assuming it will be there this time
> too (assuming there is a SEDOC this year -- Southeast DeLorean 
Owner's
> Club keeps a pretty low national profile until shortly before the 
show).
> 
> Bill Robertson
> #5939
> 
> >--- In DMCForum@xxxxxxxxxxxxxxx, "cartermartin" <cartermartin@xxxx>
> wrote:
> > Bill,
> > 
> > Thanks a bunch for the tip. If i don't tackle this myself I'll 
lookup 
> > norman for sure. 
> > 
> > I'm suspecting my 25+ year old Craftsman compression guage might 
> > be 'a little' off ;-{). But I'm feel it's likely more important 
that 
> > the pressures be reasonably close. The B280f is rated at 169# so 
180 
> > would not be a good thing.
> > 
> > If you guys are going to be at lanier that's a hop skip and a 
jump 
> > from me. I'll definately drop in and say hi. I'll bring the 
camera 
> > gear.
> > 
> > Look at: 
> > 
> > http://cartermartin.com/Photography/2004-05-
01WalterMitty/index.htm
> > http://cartermartin.com/Photography/2004%20Sebring/index.htm
> > 
> > Carter
> > 
> > --- In DMCForum@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
> > wrote:
> > > Just north of Columbia SC (US 1 off I-20):
> > > Norman Preser
> > > 754 Kirkland Circle
> > > Elgin, SC 29045
> > > (803) 438-6626
> > > 
> > > Has extensive experience with PRV's. He's German, so fasten your
> > > seatbelt for the accent.
> > > 
> > > BTW: What octane fuel do you use with those cylinder pressures? 
I 
> > have
> > > an 11:1 Ford 460 that is also 180-185 PSI. Finally got it to 
run on 
> > 93
> > > without octane boost by burning the coolest plugs available and
> > > retarding ignition by ear (I think the harmonic balancer timing 
> > scale
> > > is off). 
> > > 
> > > BBTW: Since you live in the area, do you have any plans to 
visit us 
> > at
> > > SEDOC in the fall (Lake Lanier)? Is like a small DCS.
> > > 
> > > Bill Robertson
> > > #5939
> > > 
> > > >--- In DMCForum@xxxxxxxxxxxxxxx, "cartermartin" 
<cartermartin@xxxx>
> > > wrote:
> > > > Sorry in advance for the long post.
> > > > 
> > > > Ok so I think I have gotten to the bottom of my Volvo 
> > 760GLE/B280F-
> > > > PRV problems or at least nearly to the bottom of it. 
> > > > 
> > > > I have essentially rebuilt my  cooling system. Along the way 
I 
> > did 
> > > > every possible test I could think of for a blown head gasket 
or 
> > > > cracked head. These include:
> > > > 
> > > > - Compression test. I got 180-185# on all 6 cyl. The numbers 
> > might be 
> > > > suspect but felt the fact they are so close together was more 
> > > > important.
> > > > - Cooling system pressure test. After all the cooling system 
work 
> > was 
> > > > done. I pressure tested it at 22# (factory spec for this 
model) 
> > for 
> > > > 15-20 minutes. I had very little, if any, leakage.
> > > > - Tested the cooling system pressure under normal running 
> > conditions. 
> > > > Pressure was built gradually up to 15-20# or so.
> > > > - A block leak test. The gizmo that detects exhaust gasses in 
the 
> > > > coolant by drawing air thru the coolant.
> > > > 
> > > > Anyway after all of this I still have coolant loss and 
evidence 
> > of 
> > > > high pressure in the system. In this case coolant blown out 
of 
> > the 
> > > > expansion bottle.
> > > > 
> > > > The only other clue was the chocolate milkshake on the filler 
> > cap. 
> > > > When I changed the oil I found no evidence of coolant.  And 
after 
> > 2 
> > > > negative 'block leak' tests (i.e. no combustion gasses) I 
finally 
> > got 
> > > > a positive after a highway run (where btw it urped out a pint 
or 
> > so 
> > > > of antifreeze).
> > > > 
> > > > It appears that under light load, idling or driving around 
the 
> > > > neighborhood, there is not a problem. This manifests itself 
at 
> > > > freeway speed when I hear a buzzing sound from time to time 
that 
> > I 
> > > > believe is either the pressure being vented past the radiator 
cap 
> > or 
> > > > perhaps even gasses blowing past the head gasket. The latter 
may 
> > be a 
> > > > long shot but the sound is coming from the opposite side of 
the 
> > > > engine from the coolant bottle.
> > > > 
> > > > At this point my suspicion is either:
> > > > 
> > > > - small head gasket leak
> > > > - Cracked head
> > > > - or maybe a seal for the cylinder liner?
> > > > 
> > > > I'm still a neophyte on these engines and since it's an old 
Volvo 
> > > > sedan (as opposed to something more exotic) I should probably 
> > walk 
> > > > away. But I feel I want to get to the bottom of all of this. 
It 
> > is 
> > > > also difficult because it's running SOOOOO good.
> > > > 
> > > > Any thoughts, ideas, or suggestions would be appreciated? Any 
PRV 
> > > > mechanics in the Atlanta area who can do a head/head gasket, 
> > please 
> > > > step forward.
> > > > 
> > > > Oh and for what it's worth I did get the Y-Pipe o-rings 
sealed 
> > up. 
> > > > 
> > > > Carter

---

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