billowing white smoke

ruckman101 · Post by **ruckman101** » Thu Sep 01, 2011 12:13 am

chachi wrote:ok, got the electrical back and took it for a run around the block. it's bluish white smoke, coming from the tail pipe, and it happens when i gas it. if i'm just rolling with the clutch in, the smoke clears up, until i have to gas it again and...fogtown. the performance doesn't seem to be suffering at all, like if i'd lost a cylinder, and no strange broken-ring-grinding noises. thoughts?

Bad rings won't really scream noise. Valve guides enter my mind. But again more oily black than white for rings or guides.

I'm no help,
neal

chachi · Post by **chachi** » Thu Sep 01, 2011 6:56 am

chachi · Post by **chachi** » Thu Sep 01, 2011 9:36 pm

ruckman101 · Post by **ruckman101** » Fri Sep 02, 2011 12:14 am

I was only speaking from my experience. Whitish, I don't know. I do know it ain't a positive.

neal

RSorak 71Westy · Post by **RSorak 71Westy** » Fri Sep 02, 2011 7:40 am

Oil smoke when giving it the gas is loose valve guides......

chachi · Post by **chachi** » Sat Sep 03, 2011 7:41 am

Post by **Amskeptic** » Sat Sep 03, 2011 11:13 am

chachi wrote:should i be able to tell from the plugs which cylinder(or cylinders) it is?

Valve Guide Wear: throttle overrun/letting off the gas

Piston Ring/Wall Wear: when you accelerate

Make your symptoms occur several times and shut off engine immediately.
Pull each plug and compare/check for wet black outer shell (same surface as threads).

chachi · Post by **chachi** » Sat Sep 03, 2011 1:53 pm

vdubyah73 · Post by **vdubyah73** » Sun Sep 04, 2011 12:02 pm

the plugs will prolly tell you which one

chachi · Post by **chachi** » Sun Sep 25, 2011 7:31 pm

Post by **Amskeptic** » Mon Sep 26, 2011 8:28 am

chachi wrote:this is the plug from 3, note copious amount of oil on plug. i didn't pull the other ones but i think i can assume this is it.

I think we best assume nothing. Pull the other ones.
Forensics, man, forensics!

If only that plug > localized trauma like a ring installation error or a bad guide.
If two plugs on same side of engine > commonly an overheat over-expansion scoring
If all plugs > global failure like grit in the intake system, a massive overheat, or just an old old incontinent engine.
Colin

chachi · Post by **chachi** » Wed Oct 19, 2011 4:54 pm

Post by **Amskeptic** » Wed Oct 19, 2011 6:17 pm

chachi wrote:pulled the head. broken valve guide, whose pieces went into both cylinders, where the pistons smashed them into the head. the piston tops and head look like ground metal beef. it's almost artistic with the brass bits sticking out of the silver head.

i can see the broken intake guide on #4; it seems possible that the parts could get into #3 as well, but...should they? or did i have a broken guide on #3 too? not that it matters, it all has to be replaced now.

The intense pulsing in the intake and exhaust tracts (almost like stand-off in carb throats) can throw a chunk of metal into every cylinder on inline engines, and definitely both cylinders on the one side of a horizontally opposed engine.
Stupid valve guide .... why did it break? Come loose in the head? People can't read or something, "chill guides and heat heads before installation"!!
Colin

chachi · Post by **chachi** » Wed Oct 19, 2011 7:30 pm

Itinerant Air-Cooled

Itinerant Air-Cooled

billowing white smoke

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