So finally fixed my noisy 445!

[machoneman]

Moby dick! Now that's funny! 

Yah know, Pro Stock racers long ago gave pet names to their engines, often writing same,with a Sharpie, on the valve covers. Maybe you should do the same.  Examples: Satan, Hell on Wheels, Bat Out of Hell, Smokey, Bad Boy, etc.

Hey, fellas, chime in with more names!

[427Fastback]

Every 5 or 6 years at work I get these 11,000 lb Bingham vacuum pumps to rebuild from pulp mills.They are a nightmare.The second one I rebuilt I named Damien the 3rd one was named Lucifer..Names are a gentle reminder sometimes....

[Barry_R]

Most of my EMC entries had names.
On the cover of the book you can see one - "plan B" is visible.
Others had cartoon dinosaur names when my kids were little
One had "extinct my ass" written on it...PHR used that one in a picture...

[My427stang]

I called it Moby Dick, but it's pretty much been known to me and my friends as the "F-ing 445" (of course I don't shorten the name when I say it) 

[My427stang]

The old 445 continues to be elusive

Slowly disassembled, and looked at everything as it came apart, and I am down to just the crank hanging in the block, thrust is where I had it originally, and no evidence of anything unhappy. No marks on pistons tops, quench pads, nothing ugly

Pistons are still on rods, but stripped the rings, nothing broken, ring land clearance good, bearings look new. No marks on counterweights, pins tight (although I will measure  when apart)

Going to clean up, get the parts and tools put away and wash and measure pistons, if I don't find something, we'll zyglo pistons like an old fool and mag the rods.  There has to be something in there

[Heo]

From the sound on the video my first thought
was a piston sound....interesting to see if and
what you find

[My427stang]

From the sound on the video my first thought
was a piston sound....interesting to see if and
what you find

Heo, I sure hope I find something.  I was really hoping to find a broken/tight ring or oil ring spreader.  So far the pistons look like new pistons, and all measured good last time, but we'll see

[Joe-JDC]

Measure the piston skirts all the way down to the bottom of the skirt.  You may find one/or some with collapsed skirt/s.   Measure in correct place, and then go down measuring each one.  The variance, if there, will become evident.  Old timers used to squeeze a collapsed piston in a vice to get them back in shape.  Not!  LOL.   Joe-JDC

[My427stang]

Measure the piston skirts all the way down to the bottom of the skirt.  You may find one/or some with collapsed skirt/s.   Measure in correct place, and then go down measuring each one.  The variance, if there, will become evident.  Old timers used to squeeze a collapsed piston in a vice to get them back in shape.  Not!  LOL.   Joe-JDC

Thanks Joe, sure will.  Did the skirts last time it was apart for the same problem, so I don;t expect to, but now stone unturned.  FYI, the slight wear pattern in the crosshatch is also exactly the same from bore to bore, so it doesn't seem they are flopping around.  However, because it goes away with heat, still looking there yet again.

[Drew Pojedinec]

Just sell the 445 to me.... After 12 years in an engine room with 2 strokes I probably couldn't hear the ticking sound anyway.

[My427stang]

Just sell the 445 to me.... After 12 years in an engine room with 2 strokes I probably couldn't hear the ticking sound anyway.

That's funny, and tempting, but I got to figure this one out...you'd think 4000 hours in the jet would do me right too, but still hear it

[gdaddy01]

did you check the under side of the piston , where the wrist pin goes through , maybe something , crank , just barely touching .  just a thought .

[My427stang]

did you check the under side of the piston , where the wrist pin goes through , maybe something , crank , just barely touching .  just a thought .

Great advice, appreciate it, and it was a known issue with some SCAT crank and piston combos, but I have tons of room.  Keep them coming!

[Joe-JDC]

Check the camshaft lobes for a nick.  Look at the rod bolt areas for sufficient clearance when hot.  We had an engine on the dyno that the camshaft was moving backward and forwards ever so slightly, and it nicked the edge of a lifter just enough to make a noise.  One lifter hole may just be off a few thousandths, etc..  Joe-JDC

[My427stang]

Check the camshaft lobes for a nick.  Look at the rod bolt areas for sufficient clearance when hot.  We had an engine on the dyno that the camshaft was moving backward and forwards ever so slightly, and it nicked the edge of a lifter just enough to make a noise.  One lifter hole may just be off a few thousandths, etc..  Joe-JDC

Will do Joe, and will follow great advice, noise seemed to change a little when I went from the 270H to the Bullet solids, but it was so long ago and so many times in the engine, it could have been my imagination.  Also, 2 different blocks. 

What's everyone's thoughts on 2618-t61 at .0045 clearance?  Any chance it could be piston slap?  Seems ridiculously loud to me for that but it does reduce with heat.  This is the first stroker I built with 2618 pistons, all the others were 4032 and run at .0025.  Seems pretty loud for that to me.

Here is a link to the video again with specific times the noise is there

Focus on "tapping", almost like a Chebby with a loose rocker, noise happens under light load at :29, :45, :50-:52 (especially good there because I come off and on the throttle) and 1:08 ignore the grind you hear at the end, 1:22, my daughter leaned on the transfer case shifter while filming

https://www.youtube.com/watch?v=gnSd_lMyFNM