 White smoke? |
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| VaccaRabite |
 Feb 18 2018, 11:46 PM
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En Garde!  Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region  |
https://www.youtube.com/watch?v=Ib4VMyWAwl8 Got Matt's car running this weekend after a few years down. 123 ignition installed and timed. Valves adjusted. Car is a 1.7 with stock injection. Its blowing prodigious amounts of white smoke when the engine is under load. I did not check compression. Matt assumes a vacuum leak, which is certainly possible. Curious notes: all the valves were tight EXCEPT the valves for cylinder 3, which were in spec. Okay brain trust. What'ca got? Zach |
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| sithot |
Feb 19 2018, 09:14 AM
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Member Group: Members Posts: 446 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None 
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Once witnessed a 3.0SC that bent valves with a missed shift doing a similar thing as unburnt fuel went to vapor straight out the tailpipe.
From personal experience I had a fuel distributor in a '74 911 I owned develop a pin hole in the metering plate. Looked like a mosquito fogger. UNBURNT FUEL and some blue smoke. Regarding sitting up for a while: Years ago I bought a barn find BMW R69S. It has sat for a few years and while it cleaned up beautifully, it did not run. The gas tank was a mess and I spent 2 weeks cleaning it. Care had to be exercised as the bike was a rare color and the paint was original. Used acid, nuts and bolts and a lot of neutralizer. It was re-coated with a PPG 2 part expoxy product I've had good luck with. FWIW, the coating is now over 15 year old and is still in perfect condition. The engine had little compression. I loosened all the valves and took a dead blow hammer to the stems to knock off any debris/carbon/rust. Did a complete tune up (points, condenser, valve adjustment, oil change and brand new (now NLA) Bing carburetors. Pumped 30 weight oil into the cylinders and spent about 15 minutes kicking it over. Re-checked compression and deemed it was enough to get it started. It did start and smoked like freight train while blowing out rust and other debris in the mufflers. Next came the "Italian Tune Up". I had already decided to do a top-end if necessary but thought the bike deserved a chance. These are very robust machines. I took it out and ran it up to redline (7,000+rpm) in 1st an 2nd and then cruised in 3rd for a cool down. This was repeated for about a half dozen times. Rode back to the garage and dumped the oil. Re-filled the sump and rode it for an hour or so. It performed flawlessly. To this day this bike is still one of the strongest running vintage BMWs I've ever ridden and I've had a few. FWIW: It's with a close friend who considers it one the best bikes in his collection of vintage BMW motorcycles. AND IT DOES NOT SMOKE AT ALL (IMG:style_emoticons/default/biggrin.gif) |
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| Dave_Darling |
Feb 19 2018, 03:30 PM
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#3
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(sithot @ Feb 19 2018, 07:14 AM)  From personal experience I had a fuel distributor in a '74 911 I owned develop a pin hole in the metering plate. Looked like a mosquito fogger. UNBURNT FUEL and some blue smoke. Unburned fuel smells a lot like fuel. Burning oil smells different. --DD |
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| sithot |
Feb 19 2018, 03:33 PM
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Member Group: Members Posts: 446 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None
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QUOTE(Dave_Darling @ Feb 19 2018, 04:30 PM) QUOTE(sithot @ Feb 19 2018, 07:14 AM) From personal experience I had a fuel distributor in a '74 911 I owned develop a pin hole in the metering plate. Looked like a mosquito fogger. UNBURNT FUEL and some blue smoke. Unburned fuel smells a lot like fuel. Burning oil smells different. --DD No kidding? LOL |
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Posts in this topic
Vacca Rabite White smoke? Feb 18 2018, 11:46 PM
falcor75 Was the engine properly hot when the smoke occurs?... Feb 18 2018, 11:53 PM plays with cars Usually on cars you have three choices for smoke c... Feb 19 2018, 01:21 AM Vacca Rabite Old gas. I wonder how old the gas is in the tank. ... Feb 19 2018, 08:06 AM ericoneal Mine was doing the exact same thing before a rebui... Feb 19 2018, 08:59 AM
Dave_Darling
No kidding? LOL
Just pointing out that you can ... Feb 19 2018, 04:27 PM sithot
Just pointing out that you can use your sense of ... Feb 19 2018, 04:52 PM plas76targa
No kidding? LOL
Just pointing out that you can... Feb 20 2018, 06:33 AM Vacca Rabite
I’ll add that there is oil all over the heat e... Feb 20 2018, 07:54 AM Dave_Darling
When you have a chance, do a compression test at ... Feb 21 2018, 12:04 PM saigon71 I may have been the last one that helped Matt with... Feb 19 2018, 03:50 PM Vacca Rabite
I may have been the last one that helped Matt wit... Feb 20 2018, 07:46 AM saigon71
I may have been the last one that helped Matt wi... Feb 20 2018, 08:05 AM sithot I'd dump the tank, adjust the valves and put i... Feb 20 2018, 08:39 AM injunmort fresh oil and filter? after years down there is bo... Feb 19 2018, 04:45 PM Rand That's blue, not white. White would be excess ... Feb 19 2018, 04:48 PM rgalla9146 Did some teenage expert fix it up with Seafoam ? Feb 19 2018, 09:00 PM bulitt Put the cigar out Zachery... :blink: Feb 20 2018, 06:46 AM Eric_Shea Stuck or broken ring. Oil. Feb 20 2018, 12:27 PM Vacca Rabite
Stuck or broken ring. Oil.
I've had that th... Feb 20 2018, 08:05 PM |
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