This is a pretty interesting engine. 3.0L V10 99kg! By way of clever design and screw in cylinder liners. No exotic materials.
Would anyone have more info or pictures of the head/liners off the block? Information in general seems scarce.
"V10 formula 1 engine technology"-Ian Bamsey:
Judd: "The idea of building the engine that way came from us but I wouldn't personally regard it as any kind of invention as it had been done before... Ferrari once used screw-in liners years ago and I think a lot of aero engines have had screw-in liners. It's not an uncommon technique.
"With conventional construction you need quite large studs to pull the head down onto the top of the liner and ensure its sealing. The explosion loads are trying to blow the head off the block- they are trying quite hard to get a gas leak there! If you screw the liner into the head, there is almost no force trying to break the head joint. There is really no axial force on the liner as a result of gas pressure so you don't need a lot of force to seal it. So you don't need very big studs to hold the head on top of the block.
"You make quite a considerable saving in stud diameter and length. The stud bosses dont go right through the head to the top deck, you just use fairly small studs around the outside. So the water jacket is free of stud bosses, which are fairly intrusive. You get a lot of design freedom for your head. In addition to the weight saving you get a nice simple and stiff water jacket. Using screw-in liners we were also able to use reduced bore centres compared to conventional construction, which helped both size and weight. A complete OX11A engine without ECU and loom, was 99kg.
"I have to admit that it did take some time to get it working properly. It is more difficult in terms of manufacturing and assembly, though not that bad. In the first half of the '96 season we had a fair bit of trouble with the construction. We had to work very closely with Aeromet (Kent Aerospace as they were then) to improve the casting techniques.
"What we wanted imposed some severe requirements on the foundry. Virtually all castings have some material that doesn't pass the test bar specification, that is part of life. A lot of work was required to achieve the required properties in all parts of the casting where we needed it."
There is the Yamaha patent too https://patents.google.com/patent/US5676096
And that's about it for info on the engine. Would any know more about screw in liners or this engine in general?