My car seems to burn more oil than I would expect for a fresh rebuild (5K
miles) - or about a quart every 500 miles. Going along with this thread it
sounds like my car is similar, in that my #1 cylinder plug is accumulating
lots of crud after only 1K miles. It's the type of crud that looks like
carbon build-up, but the color is tan-black, not the wet black I would
normally associate with fouled plugs. Leaving it too long without cleaning
will cause the tip to almost disappear.
Something different here is that my car doesn't blow any blue-ish smoke (at
least not what I could see). The idle is rough when cold, but the engine
runs and idles fine when hot. I would expect this from an engine that been
rebuilt a couple of times (ie higher compression, each cylinder is at 185
lbs).
One thing I did notice is that when I remove the oil cap the revs increase,
about 100 to 200 rpm. Just based on this I would suspect a bad valve guide
as the primary cause. Another person suggested that the oil ring on #1
didn't seat properly.
Ideas?
John in San Diego
'67 TR4A IRS
(I really don't want to pull the engine out again!)
-----Original Message-----
From: Jim Muller [SMTP:jimmuller@pop.mail.rcn.net]
Sent: Monday, November 18, 2002 4:03 PM
To: triumphs@autox. Net
Subject: RE: Blue smoke and good compression
On 18 Nov 2002 at 17:23, R. Ashford Little II wrote:
> The question is this: since I get more smoke at upper rpm's, but the
> manifold vacuum pressure is less at upper rpm's than at idle, then why
> doesn't it smoke more at idle than at those elevated rpm's?
Here's a guess. Depending on the state of your PCV system, higher
rpms create more pressure in the crankcase, and thus higher pressure
at the tops of the valves via the pushrod tubes, thus pushing more
oil down the valve stems.
--
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire, '70 GT6+
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