RX1 turbo smoking ?

[old mm 700]

when I go down hill with little throtle oil seems to load up then when throttled it blows white/blue smoke. Does anyone have an idea whats wrong

 

[Snowright]

Engine braking = higher vacuum , maybe the rings or valve guides are worn and leaks.

 

[mbarryracing]

Where is you turbo located?

 

[old mm 700]

The turbo is a rear mount mcx.Engine has new rings/valves/seals&bearings

 

[mbarryracing]

You are gonna have to isolate wether it's the engine or turbo that is passing oil. Is there oil in the exhaust outlet or in the charge tube?

 

[RED]

Are the return line kinked? Or the mcx oil pump is not working. Buddy has 06 mcx apex were the return line got pinched around the fuel tank causing a turbo smoking issue. Have heard sometimes the drive pins break in the mcx oil pump. Likely something to do with that as you say the engine parts that cause that arae replaced already.

 

[old mm 700]

there is oil in the charge tube

 

[mbarryracing]

Yup, the turbo is pushing oil past the seals, either not scavenging the return oil away enough or the bearings are going away.

 

[givemeaboost]

Does it have a oil restrictor in the oil line to the turbo ? They need to have the pressure cut down or it will blow oil past the seals in the turbo causing oil to get in the charge tube and intercooler. Ken....

 

[TT]

First make 100% sure that the vent line from crankcase isn't kinked since you had the engine rebuild.

If that isn't the problem here is a few ideas to check with the the MCX rearmount turbo kit:

1. Check if the 3mm pin in MCX oil return pump is broken

2. Make sure the oil pan under the turbo is still bolted on and all banjo fittings are tight. Some times they come loose.

3. Check both the return line and vent line from the oil pan under the turbo for any restrictions (kinked collapsed or melted) or holes. Tips: look were the hoses goes around heat shield and by the gas tank/bulk head right side

For your information the Mit. T16 turbo MCX uses doesn't have a restrictor . It is a journal bearing turbo.

 

[old mm 700]

Thanks for all your replies verry helpfull, found lines were crushed a little in that tight gas tank spot changed them a bit & shimed tank up 2 washers. Have to try it again now just got a dump of snow