handymanny01 wrote:cheers paul, good to know!,, i just got cheapish ali-express nozzles, for the purpose of testing,, will see if my fuel tech can make them work or not.... my current and bigger problem is keeping the head on it! lol another blown head gasket! curses! (even with ARP studs) im actually thinking of making a solid copper one, and fitting steel o rings into the head... then sealing all coolant and oil passages with viton o rings.. begining to wonder if the 2.8 head gasket with its smaller bores is less prone to failure? im pressing on with this 3.1 direct injection engine none the less! my other thought is maybe the toyota cam plate in my injection pump is too aggressive ,, i (MAY) also be running too much advance... which is prob adding to my excessive cylinder pressures..
Are you using genuine MLS type head gaskets? If not you will probably have failures. Could also got to the higher grade arp studs as well (ARP 2000) about 20% more clamp pressure. I would say it is most likely injection advance causing the issue though. I am just running stock pump timing, but also have reduced compression so peak cylinder pressure would be significantly less, water methanol is also pretty hard on head gaskets, as it will cause advance too. I was also thinking copper gasket is eventually the way to go for high boost build. If you o-ring the head make sure it is inline with the liner protrusion so it seals on that. If I build another engine I’m going to modify the top flange of the liners to taper more of a point and run a little more liner protrusion, this would provide a similar crush effect to seal the gasket and not have an o-ring wire