For those of you experts out there....

I have problems setting up my ST170 engine... Emissions are high....

The engine has been dry sumped and I have removed the crankcase vent system and blanked off the hole with a plate.... The cambox vent oes directly to the oil catch tank....

Is this a good idea or do you think I should vent the crankcase.....

Dave B

Original injection? Carbs? Throttle Bodies? Lambda sensor installed? Wide band Lambda?

loads of zetecs run with just the one breather and they breath fine.

[Edited on 5/2/12 by big_wasa]

The engine is as follows....

1. Jenvey throttle bodies. 48's (a bit big but they were free!) 60mm trumpets.... Airbox with single input.
2. 4-1 Exhaust with a sports Cat
3. S60 DTA ECU
4. Innovate wide band Lambda sensor
5. Crank Sensor
6. Variable inlet Cam
7. Cam Sensor
8. Air temp Sensor
9. TPS
10. 3 bar fuel reg


thanks
Dave B

How high?

Is the cat new, did it get properly hot?

Has the ECU been mapped properly on a rolling road?

Pretty bad....

CO = 0.09%
HC = 851ppm
CO2 Level = 9.7%
O2 Level = 7.66%
Lambda = 1.47

Yes the Cat is new.....

I have enabled the close loop control today after DTA gave me a few setting updates... But it still miss fires a bit...

I will get it back on the Analyser when the weather gets better....


Dave B...

I have a 50,000 mile ST zetec and it breathes pretty heavy. Much more than the prior silvertop and blacktop I had in before. Another ST zetec user also said his engine was a heavy breather. I have both block and cam cover vented to a catch tank. Even so the car disgraced itself at the last rolling road session with an oil spill, blown out of the catch tank at high revs full load. So I would vent the block and fit a well designed oil trapping catchtank.