1dazpay Posted October 31, 2008 Report Share Posted October 31, 2008 anyone know why there is white smoke flowing out of the exhaust and it will go away in about 5 seconds and only when cold. i have a webber 32/36 on a l20b i have a good idea that its gas and have adjusted the carb to death and still white smoke. Quote Link to comment
dat521gatherer Posted October 31, 2008 Report Share Posted October 31, 2008 probably just condinsation. Quote Link to comment
vgwagon Posted October 31, 2008 Report Share Posted October 31, 2008 That's normal, when exhaust cools condensation occurs and moisture builds up in the exhaust system, when you start the car up you burn that moisture off . Quote Link to comment
1dazpay Posted October 31, 2008 Author Report Share Posted October 31, 2008 wish it was but not a lot of condinsation in phoenix az. smoke is a little thick and and the engine has a rough idle until it clears up. Quote Link to comment
Bugeye Posted October 31, 2008 Report Share Posted October 31, 2008 white smoke is water or condinsation blue/grey somke is oil Quote Link to comment
Fineline Posted October 31, 2008 Report Share Posted October 31, 2008 Valve stem seals? Quote Link to comment
datzenmike Posted November 1, 2008 Report Share Posted November 1, 2008 I find with valve seals that leak down on shut off cause a definite blue puff on start up. Over rich/flooding makes black smoke. Sounds like steam. Check that the intake/exhaust manifold bolts are tight. The two coolant holes in the head to the intake runners could be leaking into the intake over night. The fact it runs rough when smoking, tells me there is something in the cylinder causing this. Quote Link to comment
1dazpay Posted November 1, 2008 Author Report Share Posted November 1, 2008 that sounds possible thanks i will give it a look. Quote Link to comment
hogboy52 Posted November 1, 2008 Report Share Posted November 1, 2008 Too much oil in the crankcase will be picked up by the counter weights and thrown on the cylinders. Smoke goes away as oil is sent to the top of the engine. Quote Link to comment
charlie6178 Posted November 1, 2008 Report Share Posted November 1, 2008 what brand of head gasket? if it's a fel pro.... that's your problem right there. Quote Link to comment
veryboard Posted November 1, 2008 Report Share Posted November 1, 2008 (edited) condensation just like seeing you breath.As long as your white smoke goes away don`t worry about it.If it doesn`t go away it could be head gasket.If you don`t have to top up you rad all the time than your probably ok. Edited November 1, 2008 by veryboard Quote Link to comment
datzenmike Posted November 1, 2008 Report Share Posted November 1, 2008 I don't have a problem with Fel Pro h/g. For most applications, if you clean both surfaces and bolts and holes, torque them down right they work fine. Quote Link to comment
datsunfish Posted November 2, 2008 Report Share Posted November 2, 2008 wish it was but not a lot of condinsation in phoenix az. smoke is a little thick and and the engine has a rough idle until it clears up. I dont think the scientific act of condensation is only limited to wet areas. But I am no scientist.:D Rough idle initially could be the need for a full tune up and carb cleaning or rebuild. Quote Link to comment
hogboy52 Posted November 3, 2008 Report Share Posted November 3, 2008 My own '77 620 will "puff" a cloud when the oil level gets over the "H" mark after several hours of sitting. I've had it happen with other cars as well and it would stop if I kept the level under the "H". Quote Link to comment
rat tail dragger Posted November 3, 2008 Report Share Posted November 3, 2008 well the problems is you need to install chrome valve springs and it will go away Quote Link to comment
ppeters914 Posted November 3, 2008 Report Share Posted November 3, 2008 well the problems is you need to install chrome valve springs and it will go away ...and a Ratsun sticker. Don't forget the Ratsun sticker. :D Quote Link to comment
rat tail dragger Posted November 3, 2008 Report Share Posted November 3, 2008 the ratsun sticker helps filter the smoke threw the chrome valve springs Quote Link to comment
ppeters914 Posted November 3, 2008 Report Share Posted November 3, 2008 C'mon, Mike, don't play dumb. We know you know all the old-timer secret handshake mechanical tricks. :D Quote Link to comment
DanielC Posted November 3, 2008 Report Share Posted November 3, 2008 Some white smoke is normal. Go back and smell it, if it has a sweet smell, could be a coolant leak. Get a radiator pressure tester. and see if the cooling system holds pressure. Quote Link to comment
racerx Posted November 3, 2008 Report Share Posted November 3, 2008 white smoke is normal for a few minutes when warming it up, specially if cold. Just in case do a compression check... Quote Link to comment
koback68 Posted November 4, 2008 Report Share Posted November 4, 2008 I dont know if your datsun is an auto or stick if its an auto you have a vacuum line that goes from engine to tranny the end at the tranny plugs into a vacuum madulater if that goes bad it can suck tranny fluid up the vacuum line and will smoke white just an idea Quote Link to comment
banzai510(hainz) Posted November 4, 2008 Report Share Posted November 4, 2008 I seen that on a volvo P1800 white smoke and no brake fluid!!!!!!!!!! Power brake diaphrame was bad. Quote Link to comment
DRIVEN Posted November 4, 2008 Report Share Posted November 4, 2008 I'm with DanielC. Go smell it. If it's sweet, you are burning coolant. The rough-run that clears up when the smoke goes away makes me suspect head gasket. You could pull your plugs and see if any one or two look different from the others. Coolant in the cylinders works great for cleaning carbon build-up.:D Quote Link to comment
620man Posted November 9, 2008 Report Share Posted November 9, 2008 I'm with DanielC. Go smell it. If it's sweet, you are burning coolant. The rough-run that clears up when the smoke goes away makes me suspect head gasket. You could pull your plugs and see if any one or two look different from the others. Coolant in the cylinders works great for cleaning carbon build-up.:D I had a 78 620 that did that and it turned out to be the head gasket. Quote Link to comment
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