Smoke on downshift / compression braking

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cestes

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Apr 17, 2005
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Hi All,

I've got a brand new ( < 4000 miles) 4.0L Rover V8 in my Series IIa/Defender hybrid.

I've noticed that when I downshift and get high rpms the engine starts making a bit of smoke. Not clouds, mind, but a few puffs. If the engine were older I wouldn't think much of it, but it's a crate engine that's right out of the box.

In a downshift/compression braking situation, where is the oil coming from: top end/valves or through the rings?

Just curious,

Thanks!

-Chris Estes-
http://tinyurl.com/47nc3
 
Check your oil level. This would happen in my BMW if the sump was a little over full. I'd say that the high vacuum braking is drawing oil into the upper ring area and into the combustion chamber.
 
I don't think that the engine is fully broken in.
Or, you're not using the proper weight.

What weight/brand oil/OCI history???
 
Hi All,

Thanks for the replies. I'll try to answer some of the questions...

It's white color smoke (I can't tell blue from white smoke). I'm pretty sure it's oil burning.

In fact, I was reading on another board from the UK (where they put this engine into everything) that it needs some pretty thick stuff: 20w-50. I've got Castrol 10w-40 right now. The engine is prone to low pressure, especially at temperature, so I guess the thick stuff helps out.

It's a 4.0L (~245ci) Rover engine. Yep, it's all aluminium (block and heads). Rover licensed the Buick 215ci (3.5L) early on, and the English will put it in all kinds of cars (I'd love to have a Triumph TR-8). Over the years it grew to 3.9L, 4.0L, 4.2L, and finally 4.6L.

I can't take credit for any of the hard work -- kudos to Stephen Peters at Safari Rover (www.safarirover.com). If anyone is looking for Land Rover work, I can't say enough great things about him.

I hope it's broke-in properly. It actually had about 500 miles on it when I got it. My original engine had some nasty problems. Stephen went 'round and 'round with it and finally gave me the new engine out of his Discovery! I'm figuring he knew what he was doing! I gotta call him -- maybe the heads weren't part of the new engine, but they sure are clean.

I've also heard that if the engine was sitting for a while, the valve seals may have dried out... Someday I'll muster up the courage to pull the covers off and have a look.

Thanks again for all your advice!

-Chris Estes-
 
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