[Diy_efi] Compression figures - was those bosch 4 point plugs

[Geoff Harrison]

Mike wrote on 9th Oct.


> Did a compression test, its 150KPa all round, ie Dry test, no
> extra table spoon of oil in chamber, 2 valves per chamber, engine
> done about 262,000Kms  etc, I think its a bit low but each
> chamber is within 5% of the average...Right now the car is running
> very smoothly on cruise but have a bit of tappet noise when
> accelerating hard at 3,000+ rpm <sigh>
>
> Comments, anyone know their last compression test on a 2-valve ?
>
I'd do that comp test again. Don't know the comp ratio of the VL Turbo 
(Nissan RB3?)
but 8.5:1 should be around 800KPa,  8.8:1 about 1100KPa. Warm engine, WOT.
I'd be expecting around 700 KPa.
Does any one have actual data / experience with this engine?

It was easier pre metric. Less than 100 PSI meant spend money.

Geoff