Jessie, I am no expert but as I say I don't believe they should sing, from = personal observation it does appear though that my injectors fill the boiler up quicker when used as I describe rather than when they are having a good sing. I appreciate that there is a very fine line between singing and working as I've suggested. Regards, IP Priest & Sons Model Engineers http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm -----Original Message----- From: modeleng-bounce@xxxxxxxxxxxxx = [mailto:modeleng-bounce@xxxxxxxxxxxxx] On Behalf Of JESSE LIVINGSTON Sent: 20 March 2005 12:14 To: modeleng@xxxxxxxxxxxxx Subject: [modeleng] Re: Injectors Pentagon, I never thought of it that way. Next time I have one of my injectors running I will have a look-see at the overflow. I always figured the = happy little sound was the steam combining with the water on its way through = the injector. Sort of like the frying sound that steam bubbles make just = before the water starts to boil in a boiler or stew pot on the stove. I know I = have heard the exact same singing sound come from the injector on a full size traction engine. =20 --=20 No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.4 - Release Date: 18/03/2005 =20 MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.