Date: Tue, 28 Sep 2004 09:03:34 -0400
Reply-To: ROBERT DONALDS <donalds1@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: ROBERT DONALDS <donalds1@VERIZON.NET>
Subject: Re: BLOCK BEARING SIZES ...
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Doug
the 1.9 case bearing combo is tricky in the sense that you cant make a
judgment call about the way the bearing fits in the case or the apparent
wear of the saddle without measuring both.
Again case shift makes it hard to do this even when you measure. Time will
tell some start having issues at 20 K when the oil light starts flickering
again.Keep in mind the 1.9 is different than the bug for a few reasons
sustained RPM, load AND case alloy. The 2.1 case is a major upgrade for
bearing fit and case wear I measure every 2.1 block that comes threw my door
and align boring is the exception not the rule. I have written about the oil
pressure problem the 2.1 develops at 130 to 150 K To recap I measured almost
every rod core for months depending on the mileage the rod distorts over
time and the bearing clearance increases to a point that the oil pressure
drops. The 1.9 engine has the same rod but the bolt just is different and
this distortion is not taking place.
see my low oil pressure at warm idle article at
http://www.bostonengine.com/articles/low-oil-pressure.htm
out of round on the case is a judgment call case shift verses web wear.Rod
out of rod the rods are out to begin with. When speaking if rods and size
its often referred to in terms of at the parting line and opposite the
parting line.The split bearings, both main and rod have a taper built into
the bearing they are thinner at the parting line.
The ability to measure is a key component in longevity
Rebuilding engines is about restoring clearances and compression.
Reassembling engines is more about learning where things go and what not to
do next time
hope this helps
Bob Donalds
all rights reserved
----- Original Message -----
From: "Doug in Calif" <vanagon@astound.net>
To: "ROBERT DONALDS" <donalds1@verizon.net>; <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, September 28, 2004 5:14 AM
Subject: Re: Re: BLOCK BEARING SIZES ...
> Thanks Bob,
> I knew you had the experience to shed additional light on the subject.
> Interesting that the 1.9s, you say always need bore.
> I rebuilt my 1.9 and the case had plenty of crush on the bearing and no
> ridge in the saddle.
> its got 40k on it and still going strong with good oil press.
> I have been hearing all sorts of stuff about the 2.1s oil press issue that
> it may be related to this.
>
> How much out of round do you allow?
>
> Doug
>
>
> ----- Original Message -----
> From: "ROBERT DONALDS" <donalds1@verizon.net>
> To: "Doug in Calif" <vanagon@ASTOUND.NET>; <vanagon@GERRY.VANAGON.COM>
> Sent: Monday, September 27, 2004 1:14 PM
> Subject: Re: Re: BLOCK BEARING SIZES ...
>
>
>> Doug
>> I measure everything and aign bore when needed.
>> the Porsche shop may have not been able to measure so they had the case
> cut
>> then they don't have to worry the problem is that the next time you are
> out
>> of luck if it needs to be done again
>> I know form experience that all bug cases need to be cut as do vanagon
>> air-cooled cases and 1.9 vanagon cases EVERY TIME and I can go out to
> 040th
>> over on the 1.9
>> The 2.1 engine need to be checked but its hard to tell the difference
>> between case shift and out of round to get around this you could use the
>> front and rear bearing to bring the case into true and then measure the
>> middle webs those are the ones you need to keep an eye on.
>> I prep the case half's and use a tool I had made that installs into the
> case
>> seal openings as I bolt them together. I then I use a slide hammer to
>> pop
>> them out then the bore mike tell no lies
>> I have spent thousands to be able to accurately measure engine parts
>> becuase thats is what its all about
>>
>> going faster miles an hour with the radio on
>> I remain
>>
>> Bob Donalds
>> Boston Engine Exchange
>>
>> ----- Original Message -----
>> From: "Doug in Calif" <vanagon@ASTOUND.NET>
>> To: <vanagon@GERRY.VANAGON.COM>
>> Sent: Saturday, September 25, 2004 3:41 PM
>> Subject: Re: BLOCK BEARING SIZES ...
>>
>>
>> > Hi Bob,
>> > Hey can you answer a quick question to those engine builders on the
>> > left
>> > coast.
>> > What criteria do you use to determine if a water boxer case does indeed
>> > need
>> > an align bore?
>> >
>> > I am in the camp to never align bore a case unless its absolutely
>> > necessary.
>> >
>> > I remember when I was 16 yrs old and rebuilding my 356 Porsche Super 90
>> > engine for my
>> > porsche powered sunroof beetle, I had spoke with Bill Shoreman from
> Lukes
>> > and Shorman here in the bay area.
>> > He told me "Every engine that comes to L&S gets an align bore" I
>> > apparently
>> > ticked him off when I took issue with that.
>> >
>> > Super 90 cases were well over 1200 bucks back in 1977 when I was doing
>> > this
>> > and I rebuilt my engine with standard bearings
>> > and it worked out fine. Hopefully that engine case is still in service
>> > someplace.
>> >
>> > Just curious what your position and experience shows.
>> >
>> > Doug
>> >
>> >
>> > ----- Original Message -----
>> > From: "ROBERT DONALDS" <donalds1@VERIZON.NET>
>> > To: <vanagon@GERRY.VANAGON.COM>
>> > Sent: Saturday, September 25, 2004 12:19 PM
>> > Subject: Re: BLOCK BEARING SIZES ...
>> >
>> >
>> >> what year is the van ?
>> >> I stock over 300 sets of German Main bearings and I am sure I can help
>> >> you
>> >> with your machining needs and questions on sizes
>> >>
>> >>
>> >> Bob Donalds
>> >> Boston Engine Exchange
>> >> 1 508 358 6264
>> >>
>> >>
>> >> ----- Original Message -----
>> >> From: "zolo" <zolo@FOXINTERNET.NET>
>> >> To: <vanagon@GERRY.VANAGON.COM>
>> >> Sent: Saturday, September 25, 2004 1:51 PM
>> >> Subject: BLOCK BEARING SIZES ...
>> >>
>> >>
>> >> Hello to the List,
>> >> I have a block that I just took apart and would like to know what the
>> > sizes
>> >> inside should be. I am thinking that one or more of the inside sizes
> has
>> >> increased and the block may have to be cut to the next size. Also the
>> >> question would be then; what size it has to be cut to and who can do
>> >> it
>> >> aroung here in the Seattle area. And who sells those bearings that
> have
>> >> bigger outside diameter sizes. Throwing the block away and buying a
> new
>> > one
>> >> is totally against the spirit of the List. We are here to do constant
>> >> makovers on our beloved friends.
>> >> I hope, some of you would know what I am talking about and give
> answers.
>> >> Regards, Zoltan
>>
>
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