Ulix-
About a year ago I told you that I never again would bore a 1275 out to a
1380. The sound you describe is exactly what mine sounded like. I hope the
problem is not what I encountered. In my engine, the cylinder wall flex was
so great that the pistons slapped fore and aft, tearing up the cylinder
walls and destroying the rings, pistons, and rendering the block useless.
As with your engine's symptoms, there was no increase in volume with load or
engine temperature, just that the sound rhythm matched the engine RPM's and
was best described as a diesel type rattle.
David Riker
74 Midget
63 Falcon
70 Torino
http://personalweb.sunset.net/~davidr
----- Original Message -----
From "Ulix Goettsch" <ulix at u.washington.edu>
To: "spridgets" <spridgets@autox.team.net>
Sent: Wednesday, August 23, 2000 10:52 AM
Subject: Brand new engine started knocking - need suggestions
> Fellow listers,
>
> I finally (after 2 years) got my new engine in the car and fired up for
the
> first time. It ran nicely and I drove it 2 or 3 times when I started
> hearing a noise. It sounds almost like the engine is a diesel.
> The sound doesn't seem to change with load, only with engine rpm. It
isn't
> very loud, no impending doom sort of noise, just a bad note to the engine
> sound. The knock is not a deep rumble, it's a lighter pitched knock, like
a
> diesel.
>
> Listening around the engine I can tell that the sound comes from inside
the
> engine, but opening the oil filler doesn't let it get louder. Using a
steel
> rod as a stethoscope against the head or block doesn't help.
Disconnecting
> the fan belt doesn't make the sound go away, nor does pushing in the
clutch
> make any difference.
>
> I pulled the pan and looked around, tried to wiggle the crank and rods,
> retorqued the rod bolts, made sure the mains are tight. Found that one of
> the legs of the oil pickup was rubbing against a crank counter weight and
> thought I had found the problem, but alas, the sound is still there.
> There was nothing exciting floating in the oil pan.
>
> When I built the engine, I had the crank measured, it only needed
polishing,
> it was already 10 under. The big ends were resized, new pistons fitted by
> the shop, block bored to match, mains line honed.
> New parts were: pistons, bearings, cam, timing sprockets and chain,
lifters,
> valve springs, complete rocker shaft with rockers.
>
> I fitted all the bearings, plastigauged the mains and rod bearings,
checked
> crank end float.
>
> In troubleshooting, what I haven't done is pull the rod or main caps.
Since
> I haven't driven or run it much since it started sounding like this, I
don't
> know if there would be visible bearing wear yet.
>
> I would be grateful for any suggestions of what to check, even crazy
ideas.
> I'm in the process of moving and can only devote so much time to this at
the
> moment. I want to drive this car so bad I can taste it.
>
> Thanks!
> Ulix __/__,__ ___/__|\__
> ..............................................(_o____o_)....<_O_____O_/...
> http://www.mirafiori.com/~ulix/ '67 Sprite '74 X1/9
>
>
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