john stones 1 - Moderator Posted May 23, 2020 Share Posted May 23, 2020 Can't find the specs for it, is it ABC, I've no bumf with it, anyone know the engine ? Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted May 23, 2020 Share Posted May 23, 2020 Yes is ABC John They did a red one and a silver one Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted May 23, 2020 Share Posted May 23, 2020 I bought one today for £10. now have 3. One in a Cougar. Edited By Paul Marsh on 23/05/2020 18:44:11 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 23, 2020 Author Share Posted May 23, 2020 Opinions, they good, carb o.k, looks a grunty little engine. Quote Link to comment Share on other sites More sharing options...
John Wagg Posted May 23, 2020 Share Posted May 23, 2020 Don't know the engine personally but if you look in the exhaust port you should be able to see if it has a piston ring or not. No ring and it will be ABC. If you Google Irvine 39 engine it brings up various results which may answer your queries. Edited By John Wagg on 23/05/2020 18:43:45 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 23, 2020 Author Share Posted May 23, 2020 No ring so i figured ABC, but wasn't sure, all google gave me was a spares list. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted May 23, 2020 Share Posted May 23, 2020 Is a slightly bigger bore than a 40, with a shorter stroke, making it more powerful than a 40 at high revs. Impeccable running with correct plumbing but they do like to leak from the front bearing BUT it is my opinion that those leaks developed with out of balanced props as I never had an Irvine leak Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted May 23, 2020 Share Posted May 23, 2020 It is ABC, looking at mine. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 23, 2020 Author Share Posted May 23, 2020 Thanks fellas. 10x6 or run it on 9 with more pitch ? Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted May 23, 2020 Share Posted May 23, 2020 10 x 6 is fine unless flying in the Reno Races for more pitch learn to fly the motor On 10 x 6 1st Edited By Denis Watkins on 23/05/2020 20:08:29 Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted May 23, 2020 Share Posted May 23, 2020 I have couple of these, they are the most optimised engines I've ever seen. I believe the .39 started out life as a .25 or .28 then a .36 and finally a .39. Bored out and tweaked, it's considerably smaller and lighter than the cooking .40. The cylinder head bolts just graze the liner so there is almost negative clearance you can see the thread break through the inside crankcase. For power to weight these were just the thing for funfly contests in the 90s and early 2000s. A. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 23, 2020 Author Share Posted May 23, 2020 Destined for a club mates Bullet, sounds like a good match ? Quote Link to comment Share on other sites More sharing options...
Former Member Posted May 23, 2020 Share Posted May 23, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted May 23, 2020 Share Posted May 23, 2020 The grey one was included in the Wot4 lite. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 23, 2020 Author Share Posted May 23, 2020 Nice Paul, you been flying yet, your field open ? Quote Link to comment Share on other sites More sharing options...
Nigel R Posted May 23, 2020 Share Posted May 23, 2020 Superb motors. Small rear bearing. 13mm crank. Rumour has it they are not so happy with extended high rpm. Will do 11k for ever though so as sport motors they are golden. .36 was good on an apc 10x7. This even more so. Add a mini pipe for rocket performance. Maybe on 10x8. Especially in a quick thing like the bullet. Heli version was ringed I think. There was definitely a ringed .36. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 23, 2020 Author Share Posted May 23, 2020 I held it back from some stuff I sold for an ex member Nigel, It had the look of something a bit nice, was gonna put it in a Skywriter, but letting a new member have it, may have a mini pipe in draw as well. Quote Link to comment Share on other sites More sharing options...
Richard Clark 2 Posted May 24, 2020 Share Posted May 24, 2020 The last Irvine engines were actually made by OS. Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted May 24, 2020 Share Posted May 24, 2020 The OS manufactured Irvines are quite easy to spot because they have OS branded carbs. I have an original Irvine .53 and an OS Irvine .53 and the major parts are not interchangeable so they must have redesigned them for cost reasons. As far as I know, OS never made the .72 or a .39. Then they disappeared off the scene altogether as I guess they were competing too well with OS's own product. It makes you wonder why OS agreed to make Irvines in the first place. A. Quote Link to comment Share on other sites More sharing options...
Former Member Posted May 24, 2020 Share Posted May 24, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Richard Clark 2 Posted May 25, 2020 Share Posted May 25, 2020 Posted by Andy Stephenson on 24/05/2020 11:04:39: The OS manufactured Irvines are quite easy to spot because they have OS branded carbs. I have an original Irvine .53 and an OS Irvine .53 and the major parts are not interchangeable so they must have redesigned them for cost reasons. As far as I know, OS never made the .72 or a .39. Then they disappeared off the scene altogether as I guess they were competing too well with OS's own product. It makes you wonder why OS agreed to make Irvines in the first place. A. It does make you wonder why OS made some late Irvine engines. I never owned one myself so I never noticed the carb branding. Except for a couple of perfectly satisfactory (but rattly-sounding at tickover) RCV58 CD's I purchased when they were actually made in the UK I stick to OS as some of the Chinese copies are complete rubbish. EG - I had two 'well known' ones where the carbs were so leaky air still got in when the throttle was fully closed and you could not cut the engine. It's a shame that the choice of 'good' engines has decreased so much. And it started before electrics became so popular so it's not entirely due to that.. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted May 25, 2020 Share Posted May 25, 2020 Gave then a chance to test out Chinese production with a brand they were running down. Same shop prices and cheap manufacture. Quote Link to comment Share on other sites More sharing options...
FlyinBrian Posted May 25, 2020 Share Posted May 25, 2020 Superb little engine as is the 36, I have had three .36s over the years but they are well down on power compared to the .39 - a Weston Genesis mini pipe adds a few hundred revs too. Quote Link to comment Share on other sites More sharing options...
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