Re: C1 Smoke on Start up
From 30 years ago IIRC that process is called "Bronze Wall". The guide is "threaded" with a special tool, then a bronze wire is run down the thread. locked in place, then reamed to size.
It's not that uncommon for engines that sit for days or weeks to put out a little puff of oil smoke on startup, and the bronze wall system leaves a small spiral passage that holds a (relative) lot of oil compared to the OE integral guides, and this oil supply can migrate down while the car sits for days or weeks between startups.
Frankly, if the rate of oil consumption is not less than 1000 miles per quart, I wouldn't worry about it.
A final note - I think its okay to use the OE stem seals (but use viton not nitrile versions) and OE steel valve spring shields with the Bronze Wall system rather than an "umbrella" or "positive" seal, but I'm not positive.
If you do decide to do something, find out the manufacturer of the Bronze Wall system that was used (It might be K-line), contact them and use whatever sealing system THEY recommend!
Different guide systems have different oiling requirements and "machinists" often don't follow the manufacturer's recommendations for the guide rebuilding systems they use, which can result in excess oil consumption or short guide life.
From 30 years ago IIRC that process is called "Bronze Wall". The guide is "threaded" with a special tool, then a bronze wire is run down the thread. locked in place, then reamed to size.
It's not that uncommon for engines that sit for days or weeks to put out a little puff of oil smoke on startup, and the bronze wall system leaves a small spiral passage that holds a (relative) lot of oil compared to the OE integral guides, and this oil supply can migrate down while the car sits for days or weeks between startups.
Frankly, if the rate of oil consumption is not less than 1000 miles per quart, I wouldn't worry about it.
A final note - I think its okay to use the OE stem seals (but use viton not nitrile versions) and OE steel valve spring shields with the Bronze Wall system rather than an "umbrella" or "positive" seal, but I'm not positive.
If you do decide to do something, find out the manufacturer of the Bronze Wall system that was used (It might be K-line), contact them and use whatever sealing system THEY recommend!
Different guide systems have different oiling requirements and "machinists" often don't follow the manufacturer's recommendations for the guide rebuilding systems they use, which can result in excess oil consumption or short guide life.
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