Diesel Injector Nozzle/Pintile material

[RacinNdrummin]

Im posting a thread here because I simply am lost when it comes to this particular part. I have had a couple of ideas on materials to use, but I don't feel confident enough to proceed without some discussion on the matter.

I am looking at producing injector nozzles for an indirect injected diesel, that could possibly range from stock to "HO" versions. I know that there are similar products made for different engine designs (Direct injected diesels) by the aftermarket, but the chances of getting them to "reveal" their secrets to me is going to be slim to none.

I guess my question is this:

What would be a suitable material to produce an injector nozzle out of? It has to handle relatively high temps(Engine wise)while only being cooled by the fuel, resist wear with direct contact of two moving parts (pintle/nozzle), and be easily heat treated/machined for affordability reasons.

Typical materials used in similar situations are various grades of stainless, Inconel, and Nimonium alloys, but I don't see those living up to the characteristics above without being high production (with the exception being stainless).

Any input would be a tremendous help.

Thanks

 

[tbuelna]

IDI diesel nozzles are quite different than DI nozzles. IDI (prechamber) nozzles typically are only used on very small displacement engines, so the orifice sizes are either very small, or a throttle-type pintle is used. IDI nozzles are also often covered by a heat shield.

I believe most diesel injector nozzles are made from cobalt alloys. The most difficult part of manufacturing them is accurately machining the flow orifices and sealing surfaces. The higher the injection pressure, the more difficult this task becomes.