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Irvine 39 2stroke.

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john stones 123/05/2020 18:28:59
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11456 forum posts
1516 photos

Can't find the specs for it, is it ABC, I've no bumf with it, anyone know the engine ?

Denis Watkins23/05/2020 18:37:17
4335 forum posts
104 photos

Yes is ABC John

They did a red one and a silver one

Paul Marsh23/05/2020 18:40:01
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3970 forum posts
1190 photos

I bought one today for £10. now have 3. One in a Cougar.

irvine39.jpg

Edited By Paul Marsh on 23/05/2020 18:44:11

john stones 123/05/2020 18:43:18
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11456 forum posts
1516 photos

Opinions, they good, carb o.k, looks a grunty little engine.

John Wagg23/05/2020 18:43:23
66 forum posts
10 photos

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

john stones 123/05/2020 18:47:20
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11456 forum posts
1516 photos

No ring so i figured ABC, but wasn't sure, all google gave me was a spares list.

Denis Watkins23/05/2020 18:53:15
4335 forum posts
104 photos

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

Paul Marsh23/05/2020 18:59:07
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3970 forum posts
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It is ABC, looking at mine.

john stones 123/05/2020 19:06:06
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11456 forum posts
1516 photos

Thanks fellas. yes 10x6 or run it on 9 with more pitch ?

Denis Watkins23/05/2020 20:07:07
4335 forum posts
104 photos

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

Andy Stephenson23/05/2020 20:08:07
144 forum posts
21 photos

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.

john stones 123/05/2020 20:19:38
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11456 forum posts
1516 photos

Destined for a club mates Bullet, sounds like a good match ?

Doc Marten23/05/2020 21:39:42
543 forum posts
7 photos

Mines an ABC, it's not red if that makes a difference.

Paul Marsh23/05/2020 22:09:17
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3970 forum posts
1190 photos

The grey one was included in the Wot4 lite.

wot4pro (6).jpg

john stones 123/05/2020 22:40:10
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11456 forum posts
1516 photos

Nice Paul, you been flying yet, your field open ?

Nigel R23/05/2020 22:48:50
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3756 forum posts
587 photos

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.

john stones 123/05/2020 23:11:52
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11456 forum posts
1516 photos

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.

Richard Clark 224/05/2020 06:39:02
112 forum posts

The last Irvine engines were actually made by OS.

Andy Stephenson24/05/2020 11:04:39
144 forum posts
21 photos

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.

Doc Marten24/05/2020 12:28:37
543 forum posts
7 photos

Posted by Paul Marsh on 23/05/2020 22:09:17:

The grey one was included in the Wot4 lite.

 

That tallies with what the sticker on my box states Paul.

Edited By Doc Marten on 24/05/2020 12:29:27

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