Reply With QuoteAll Aussie 3.5 EFI engines are 8.35:1 compression and should test at between 110psi - 130psi compression for a healthy motor. Anything under 100psi you'll start having trouble getting enough vacuum to open the airflow meter flap and start fuelling.
Fossicker
hi all can anybody tell me what the compression of a 3.5 injected motor should be! cheers
All Aussie 3.5 EFI engines are 8.35:1 compression and should test at between 110psi - 130psi compression for a healthy motor. Anything under 100psi you'll start having trouble getting enough vacuum to open the airflow meter flap and start fuelling.
Fossicker
thanks for that its got between 90 and 60 so might be time for another motor.
ForumSage
Little bit tired! A worn cam could also contribute to low compression values.Originally Posted by buggeroffroad
I have no idea what mine is, but I am due for a rebuild anyway (bearing issues).
Fossicker
yeah well a fresher second hand motor is coming for it over the weekend just got to pick it up and by-by to the troublesome efi it has a stuffed ecu too i am suspecting as 2 injectors have stopped working for some reason after i put all new ignition components so i am going carbs at least ya can fix them.
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