Been seeing a lot of smoke in the mirrors at the top end of the drags strip when backing off and braking.
I did think it may have been tyre smoke from the drag radials touching the chassis and arches under heavy breaking but a witness says it looks to be coming from the exhaust but only at the top end of the run not on gearchanges.
My engine was recently rebuilt with refurbed heads including new valave seals. The engine is clean on the outside still. I did a compression test and all 8 were between 200 and 225. The rocker breather feeds to a catch tank and that used to feed to the plenum but this was changed and the inlets to the plenum were plugged. The catch tank now feeds to air.
Any ideas?
Smokey exhausts off throttle. TVR Chimaera V8
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Hi
could be sucking oil in from the valley past the gasket/valley cover as you lift off at high speed, by the top of the run there is probably quite a bit of oil built up in the valley area and with no crank case vacuum oil mist is getting pulled into the inlet.
The slingshot did this early on but because the Chevy has a paper gasket that is a bit thicker is sucked the bottom bit of the gasket through the engine then wouldn't run properly!
best regards
Mike
could be sucking oil in from the valley past the gasket/valley cover as you lift off at high speed, by the top of the run there is probably quite a bit of oil built up in the valley area and with no crank case vacuum oil mist is getting pulled into the inlet.
The slingshot did this early on but because the Chevy has a paper gasket that is a bit thicker is sucked the bottom bit of the gasket through the engine then wouldn't run properly!
best regards
Mike
poppet valves rule!
Hi
where the bottom of the head joins the block the gasket face between the head and the inlet manifold is very narrow, the gasket/valley cover forms the top of the valley however it also tends to lift gasket away from the head surface at the corner this offers an area for the inlet vacuum to draw air from the valley into the inlet tract. On my Chevy this is bad enough to draw the (admittedly thin) bottom of the gasket into the inlet port and through the engine.
Best regards
Mike
where the bottom of the head joins the block the gasket face between the head and the inlet manifold is very narrow, the gasket/valley cover forms the top of the valley however it also tends to lift gasket away from the head surface at the corner this offers an area for the inlet vacuum to draw air from the valley into the inlet tract. On my Chevy this is bad enough to draw the (admittedly thin) bottom of the gasket into the inlet port and through the engine.
Best regards
Mike
poppet valves rule!