

| Subject: | Fwd: Boston Bob on Connecting Rod Bolts |
| From: | Tom Lambas |
| Date: | Tue, 7 Sep 2010 19:49:11 -0500 |
I'm gonna go with Van Cafe I think. __________ On Tue, Sep 7, 2010 at 6:46 PM, Evan Mac Donald <evanm@att.net> wrote: > > > I did not send my rods to Bob before he passed. Since the business has > passed > into other hands, the rebuuilding of rods as a service is not listed > anymore. Now, I need to find a different source for this job. Has anyone > heard > anything, good or bad about this outfit: > > http://www.thesamba.com/vw/classifieds/detail.php?id=931786 > > I hope to get my rods out this time, before something bad happens again... > > ________________________________ > > <<Snip>> > > >Evan > >1.9 and 2.1 rods are the same casting and are interchangeable with the > >exception of the bolt. The longer stroke 2.1 cranks in combination with > the > >1.9 rod bolts can but do not always hit the camshaft > >The 2.1 rod bolt work well for 150K and I have seen these stretch to yield > >bolts reused with failing. > >2.1 rods distort over time by this I mean the big end is no longer round. > >The cap shifts and the big end gets smaller opposite the parting line. > >Another way to say that is if you draw a line down the rod from the small > >end threw the beam of the rod threw the big end the circle is smaller at > >that point. So just replacing the bolts is not the cure for the 2.1 rod > >problem. The big end needs to be resized to do this I have a cap grinder > it > >trims a few thousandths off of the mating surfaces of both the rod and > cap. > >After deburing the hole and installing new non stretch to yield bolts and > >reassembling the rod I torque the nuts and resize the big end with a > sunnen > >rod hone. Machine shops have spec books to provide dimensions for the > >finished size. > > >>snip<< >
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