Hegg
Jedi Hopeful
Offline
Alright, I know that nobody should raise an eyebrow about an LBC burning oil, but this is serious!
I *finally* got my 1970 Elan +2 put back together and it starts up and runs now! However, after 20 or 30 seconds of running, the exhaust blows smoke that would put James Bond to shame. It is quite seriously bad -- this isn't just some casual engine smoking.
So here's my investigation results so far. I changed the oil because I thought I might have overfilled it initially anyway. I put 4 quarts back in and threw on a new filter. I pulled the plugs and all of them were VERY wet and oily, with the exception of #1. #1 was dry, but black (these are new plugs). I checked compression on all 4 cylinders with results as follows:
#1: 145
#2: 160
#3: 155
#4: 155
According to the book, compression should be 160 at sea level and I'm at 4,500 feet, so compression looks great to me.
I inspected around the entire engine by the head gasket and can't find the slightest evidence of even an oil dribble. The only thing I noticed that made me raise an eyebrow was how long it took oil to drain through the oil filler cap in the camshafts cover. It seemd to fill up quickly and I'd have to slow down to wait for it to drain through so it wouldn't overflow. Opening up the radiator cap reveals that I've lost some coolant, but I don't see any drips underneath the car.
So then, what should I consider? I initially thought that maybe the head was warped and/or the head gasket was bad, but it seems that the compression tests and lack of any leaks would suggest that they are in acceptable condition. But with missing coolant and oily cylinders, I would reconsider that.
Could it be in the head? Maybe the valve tappets are worn and leaking oil through? Doesn't seem like they could leak *that* much oil though.
Would my next best step be to pull the head and inspect the head gasket and have the surface machined flat?
Thanks everyone! I've driven the car around the block twice now and WOW is that a fun car! Can't wait to get the smoking problem resolved so I can get it registered and not feel guilty driving it around!
I *finally* got my 1970 Elan +2 put back together and it starts up and runs now! However, after 20 or 30 seconds of running, the exhaust blows smoke that would put James Bond to shame. It is quite seriously bad -- this isn't just some casual engine smoking.
So here's my investigation results so far. I changed the oil because I thought I might have overfilled it initially anyway. I put 4 quarts back in and threw on a new filter. I pulled the plugs and all of them were VERY wet and oily, with the exception of #1. #1 was dry, but black (these are new plugs). I checked compression on all 4 cylinders with results as follows:
#1: 145
#2: 160
#3: 155
#4: 155
According to the book, compression should be 160 at sea level and I'm at 4,500 feet, so compression looks great to me.
I inspected around the entire engine by the head gasket and can't find the slightest evidence of even an oil dribble. The only thing I noticed that made me raise an eyebrow was how long it took oil to drain through the oil filler cap in the camshafts cover. It seemd to fill up quickly and I'd have to slow down to wait for it to drain through so it wouldn't overflow. Opening up the radiator cap reveals that I've lost some coolant, but I don't see any drips underneath the car.
So then, what should I consider? I initially thought that maybe the head was warped and/or the head gasket was bad, but it seems that the compression tests and lack of any leaks would suggest that they are in acceptable condition. But with missing coolant and oily cylinders, I would reconsider that.
Could it be in the head? Maybe the valve tappets are worn and leaking oil through? Doesn't seem like they could leak *that* much oil though.
Would my next best step be to pull the head and inspect the head gasket and have the surface machined flat?
Thanks everyone! I've driven the car around the block twice now and WOW is that a fun car! Can't wait to get the smoking problem resolved so I can get it registered and not feel guilty driving it around!