50kpa on idle

[Senchiro]

Hello.I have a m20b20 engine with a charger.What can i do to make good kpa? 50 is to many(( 800rpm, 20deg on idle.If without charger, it is 46kpa.

[GintsK]

What is wrong with 50Kpa?  ???

[Senchiro]

It is not normal pressure on idle i think? normal is near 28-30kpa?

[GintsK]

It depends from cam. Narrow cams with zero overlap gives lowest absolute pressure. With overlap increase pressure rises. In some cases it can be in 90...100kpa range.

Gints

[Senchiro]

cam is stock )) may it be from changed  degree of compression? it was 9.4, now is 8.0

[Jamo]

I would say that is normal pressure

[mattias]

50 is perfectly normal for a stock M20. It will loose some from the lower c/r.