[DMCForum] Re: B280 Compression Spec (Carter)

["content22207" <brobertson@xxxxxxxxxxxx>]

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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