Dennis Mulhair Posted March 6, 2022 Share Posted March 6, 2022 Hello, Recently I was given an old Irvine 46 motor. I need to get some parts for it but I’m not sure what mark it is. I do know that it was made in England, the Allen screws that hold the silencer on need a 1/8” Allen key and the body is not RED. Can anyone tell me how I find out it mark No. So I can order the correct parts. Many Thanks Dennis Mulhair Quote Link to comment Share on other sites More sharing options...
kevin b Posted March 6, 2022 Share Posted March 6, 2022 I think you might struggle to get spares for that engine. Certainly new ones. Your best bet is to have a chat with Andrew at Just Engines. I think the only people using imperial sizes these days are the Americans (there's irony for you !). Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted March 6, 2022 Share Posted March 6, 2022 Have a look on spectre flight... Quote Link to comment Share on other sites More sharing options...
David Davis 2 Posted March 7, 2022 Share Posted March 7, 2022 I believe that the earliest Irvines, the so-called Mark 1, had a plastic carburetter. This was replaced by the Jetstream carburetter on the Mark 2. Of course someone could have fitted a Jetstream carburetter to a Mark 1 as an upgrade. Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted March 7, 2022 Share Posted March 7, 2022 (edited) 10 hours ago, Rich Griff said: Have a look on spectre flight... http://sceptreflight.com/Model Engine Tests/Index.html But no 46. Edited March 7, 2022 by EarlyBird Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 7, 2022 Share Posted March 7, 2022 (edited) 13 hours ago, Dennis Mulhair said: an old Irvine 46 motor. I need to get some parts for it Sounds like a mk1 or mk2; mk3 on were one piece red cases. Almost all spares for the silver (two part) case engine are, give or take, rocking horse poo. You're most likely looking for a non-runner to rob parts from, I would think. As part of a project to refurb a motor gifted to me, I ended up buying four motors (!) to make one good one, and then had enough bits for a second. I'm not sure the economics really stacked up in any way... Edited March 7, 2022 by Nigel R 2 Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted March 7, 2022 Share Posted March 7, 2022 If I remember correctly there was a bmfa webinar recently, about 2t model aero engine developement. The chap worked with Irvine engines. Maybe worth an ask ? A picture may also help. Quote Link to comment Share on other sites More sharing options...
kevin b Posted March 7, 2022 Share Posted March 7, 2022 Here you are Rich. 2T Webinar Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted March 7, 2022 Share Posted March 7, 2022 (edited) There you go Dennis...have a look-see... Maybe Andy from bmfa could get you in contact with the chap from Irvine ? A picture of the engine may help ? Edited March 7, 2022 by Rich Griff Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 8, 2022 Share Posted March 8, 2022 A picture is worth a thousand words . Apart from a repo piston ring and bearings it's unlikely you will find any new parts for an old Irvine. They do come up on ebay now and again as do occasional " New old stock" bits, just don't pay to much for a breaker as its likely to need the same work as yours. Be aware that the early Irvines had Dykes piston ring that would not give hardly any compression when turned by hand. Dyes rings are very thin and an become stuck or gummed in their groove. Be very careful when freing them up or removing them. So if your engine feels low on compression don't be to worried. The Mk1 had bearing issues as the front bearing was very small and failed regularly. Mk2 had a much bigger front bearing easily identified by the front housing. If it has a plastic carb don't bother with it as it probably worn or damaged by now . Try and find a carb either same spigot size . They were good engines in their day but there are loads of less problematic, more reliable and useable engines around for not much money as many flyers race to electric power. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 8, 2022 Share Posted March 8, 2022 On 06/03/2022 at 19:56, Dennis Mulhair said: I need to get some parts for it Which parts do you need? I do have a few spares lying around... Quote Link to comment Share on other sites More sharing options...
Dennis Mulhair Posted March 9, 2022 Author Share Posted March 9, 2022 Thanks folks for this. Been talking to Wheekspin Models and they contacted the inporters of Irvine engines and they say as long as its an "ABC" then most parts will fit. So Im going to order a new piston & liner and see what happens. Once again Thanks folks. Dennis 1 Quote Link to comment Share on other sites More sharing options...
Dennis Mulhair Posted March 9, 2022 Author Share Posted March 9, 2022 I managed to get some drawings of the Mk2 & 3 motors and the MK3 has the words "IRVINE" vertically written on the crankcase and the screws for the exhaust go through the case into the exhaust pipe. On the MK2 (ABC) "IRVINE" is written directly below the cylinder barrel and the screws do not pass through the crankcase. So I believe my motor is a MK2. Do you agree? Dennis Quote Link to comment Share on other sites More sharing options...
EarlyBird Posted March 9, 2022 Share Posted March 9, 2022 This is the nearest I could find. are you sure it's a 46? Seems odd that the size is not on the body like this. Steve Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 9, 2022 Share Posted March 9, 2022 Yes, looks like a mk2. The mk3 is not compatible. Beware. What's happened to your current piston and liner? Debris damage? Quote Link to comment Share on other sites More sharing options...
Dennis Mulhair Posted March 10, 2022 Author Share Posted March 10, 2022 The Liner is OK nut the piston is scored. Trying to get one now before I can't. Also could do with bearings. As I see it might as well replace these too if I'm taking it all apart. Dennis Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 10, 2022 Share Posted March 10, 2022 Main bearing is tricksy, its mixed imperial and metric sizing, I'd leave alone if it's ok. BOCA in the US did some as a special order (just don't ask about the price!). I'm not aware of another supplier. S-46-1120 is the part number for piston/liner set for mk1/mk2. Note The later mk3 red case engine uses part number S-46-3120, as previously stated they are very different. Irvine .46 MkII datasheet (1).pdf Quote Link to comment Share on other sites More sharing options...
Geoff S Posted March 10, 2022 Share Posted March 10, 2022 I totally destroyed a very nice Irvine 46 Mk (the red one) and the Wot 4 it powered a few years ago. The casing was damaged and, I think, the carb, but the liner crankshaft piston etc are OK. If anyone's interested I'll look them out. I've also got a Q40 complete and some 'remains'. Not sure what state either are in without checking. I'd be happy for them to go to a good, useful home because I know I'll never run them again. Free for the cost of postage - or pick them up if you're near Belper (10 miles N of Derby). Geoff Quote Link to comment Share on other sites More sharing options...
Nigel R Posted March 10, 2022 Share Posted March 10, 2022 22 hours ago, EarlyBird said: are you sure it's a 46? Seems odd that the size is not on the body like this. Missed that. Yup, the size being milled off is the giveaway that it is a 46. It used a 40 case, bored out for a bigger liner. To differentiate, the '40' was removed. 1 Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted March 10, 2022 Share Posted March 10, 2022 Re the mixed size bearing, I spoke to someone at Irvine’s 20 or so years ago when I returned to model flying and wanted to check on spares for my late 70’s 40 to see if it was worth recommissioning and he said that they used a standard bearing with a sleeve as a replacement for the unobtainable original. If you have access to a lathe it could save the engine if you need a main bearing. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 11, 2022 Share Posted March 11, 2022 Imperial bearings are readily available from Simply Bearings . It's common for older engines to use imperial bearing for the front bearing. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted March 23, 2022 Share Posted March 23, 2022 Hi, I am currently building a Kwik Fly Mk 111 for my tatty old Irvine .53,any idea how I can get the fading red powder coating off ?. thanks Paul Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted March 23, 2022 Share Posted March 23, 2022 Soak it in cellulose thinners, paint stripper or brake fluid for a couple of days . Check paint stripper doesn't damage alloy. I use a bead blaster to remove the coating as it only a type of paint. The OS LA engines clean quite easily. I haven't stripped the coating off of an Irvine yet but have a couple of broken ones do might fire up the blasting cabinet to see how easy it comes off. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted March 23, 2022 Share Posted March 23, 2022 Thanks first stop, Brake fluid, I have to change it tomorrow on my Yamaha,, waste not want not,,,, Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted March 23, 2022 Share Posted March 23, 2022 Paul, If you soak it in any kind of solvent, make sure to remove the carb first otherwise the seals will swell and degrade. Quote Link to comment Share on other sites More sharing options...
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