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Smokey 4.6 RV8


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I rebuilt a 4.6 RV8 a few years back but the engine has only covered about 200 miles since then.

When built the engine ran Ok.

May not be relevant but may be - a little while back the I was running the engine and the thermostat failed to open so the engine got hot - when it did open the coolant boiled and the metal temp on a head bolt sensor was 120c.  The engine did not seize and when cooled started fine.

Engine continued to start fine then about 6 months later smoke started to appear - is coming out from both banks.

On a cold start there is no smoke, when the engine has been running for a little while oil smoke starts and gets quite thick.  Driving the vehicle, the smoke remains for a while then it totally clears and there is nothing but a perfect exhaust colour.

Here is a vid of the engine smoking

[url=https://flic.kr/p/2iPSwJW][img]https://live.staticflickr.com/31337/49768491922_d6eb906824_b.jpg[/img][/url][url=https://flic.kr/p/2iPSwJW]Vid Uphill with Smoke[/url]

Here is a vid of the engine a couple of minutes later where the engine is running better and not smoking at all.

[url=https://flic.kr/p/2iPN9bt][img]https://live.staticflickr.com/31337/49767635583_7de87d0626_b.jpg[/img][/url][url=https://flic.kr/p/2iPN9bt]Vid Uphill no Smoke[/url]

Now if it was valve seals wouldn't it smoke from start and likewise if it was rings wouldn't it smoke all the time and not clear.

After some thoughts.



PS sorry about the lack of a click on link for the vids - normally it comes up but hasn't in this case.




Edited by garrycol
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I am no V8 expert , but agree the common wisdom on valve stem seals and rings. Is it possible it could be a breather issue, maybe dropping oil after start up into the inlet which takes a moment to get sucked in? It doesn't take a lot of oil to make smoke. Can you divert the breathers somehow, maybe to a catch tank and see if it still happens? Otherwise it does sound like a sign of something more expensive.  Does it use much oil?

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Thanks for that - yes your logic is sound but I do not have the breather system set up yet so both rocker cover breathers just vent to atmosphere with no sucking of fumes into the inlet system.

Thanks for your input.



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It does sound like something is accumulating somewhere - and then burning off for a bit. But then I would expect it to be worse at cold start, and not suddenly come on while driving. Very strange.

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