Originally Posted by NZScott

If there's a venturi, that will provide the vacuum required without having to cut flow off dramatically. Remember if you cut 1/2 the airflow essentially you're cutting the CR down to 10:1. Now if these engines started and ran with 10:1 compression with working glow plugs yadda yadda they wouldn't build them with 21:1.... that's my understanding of it anyway.

Only trouble with disconnecting the injection pump pipe from the manifold is that it will run away once started, so would have to be a Tee. I might try it one day on my Granddads '75 HJ45...


Block casting number is likely to be behind the IP. Should be 621 918 apparently