Hi Joey, Yes, standard comp with only a light skim of the H89 head. I didnt measure anything related to comp but id guess just a touch higher than standard because of the head skim.

Engine life, is an interesting question.
With moderate boost, the peak cylinder presure isnt much higher than a non boosted engine. But the pressure is maintained for more of the power stroke. Because of this, loads on rods and bearings dont go up much. Its more a matter of thermal management, things like pistons and cooling systems can be quickly overcome because the extra time the force/heat is applied per power stroke.

Ring wear would go up a bit because its forced againsed the bore longer on each power stroke. compared to NA.


Keeping the standard pistons from overheating is probably the biggest concern.
Thats where E85 is is a huge help. Good intercooling plays a big part too.


The engine managagment system can also play a big part in saving an engine. Things like Compensation tables set up to retard ignition as intake temps rise or Electonic boost control backing off boost if EGT`s get a bit high.

Where mine is at now i`d expect 100,000 Kms on a road car with sensible rev limits and general good treatment. Or a season of racing.

But get something wrong with the tune and it might last 5 minutes if its allowed to detonate.

G`day Leigh!! Heading out for a practice and sprint at Winton this weekend. IPRA round is looking good at the start of Oct, also at Winton.
No Star Sharks yet but V soon.