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Irvine Mills .75 replica Empty Irvine Mills .75 replica

Post  Grosvince Wed Mar 24, 2021 5:15 pm

Hello

Just a few pics of a nice Mills I bought last week :

Irvine Mills .75 replica 20210317
Irvine Mills .75 replica 20210318

Regards,
Vincent
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Post  dckrsn Wed Mar 24, 2021 6:55 pm

Vincent, The Mills .75 looks to be a hugely popular engine in Europe. Though
I've never been around diesel hobby engines, I have have always admired their
appearance. They look very well made.
http://modelenginenews.org/cardfile/m75.html
Bob
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Post  davidll1984 Wed Mar 24, 2021 10:29 pm

This is a cool litle engine i want one Very Happy
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Post  Oldenginerod Thu Mar 25, 2021 2:10 am

I have an original English Mills .75. Sadly, the Irvine copy doesn't have interchangeable parts and original parts are very rare indeed.
Grosvince, if you are ever tempted to dismantle the engine (I'm not encouraging you to do so) I would appreciate it if you could take measurements of the con-rod so that I can compare them. Irvine parts are still available to some extent.

Rod.
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Post  Grosvince Thu Mar 25, 2021 3:42 am

@Oldenginerod wrote:I have an original English Mills .75.  Sadly, the Irvine copy doesn't have interchangeable parts and original parts are very rare indeed.
Grosvince, if you are ever tempted to dismantle the engine (I'm not encouraging you to do so) I would appreciate it if you could take measurements of the con-rod so that I can compare them.  Irvine parts are still available to some extent.

Rod.

As I don't know how to remove cylinder head and cylinder with no damage on this engine, I would prefer not to dissassemble it. Sorry.

Vincent
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Post  Oldenginerod Thu Mar 25, 2021 4:46 am

@Grosvince wrote:
@Oldenginerod wrote:I have an original English Mills .75.  Sadly, the Irvine copy doesn't have interchangeable parts and original parts are very rare indeed.
Grosvince, if you are ever tempted to dismantle the engine (I'm not encouraging you to do so) I would appreciate it if you could take measurements of the con-rod so that I can compare them.  Irvine parts are still available to some extent.

Rod.

As I don't know how to remove cylinder head and cylinder with no damage on this engine, I would prefer not to dissassemble it. Sorry.

Vincent
Don't be sorry. I completely understand. If you don't need to dismantle it, don't.

The cylinder head (known as the "Muff") just unscrews. It retains the cylinder which just slips into the crankcase. The original Mills had no way of preventing the cylinder from rotating if the Muff comes a little loose. It happened to me and that's why the con-rod is damaged. I'm pretty sure they rectified the fault on the Irvine by inserting a locator pin to prevent the cylinder from rotating.
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Post  sosam117 Thu Mar 25, 2021 11:09 am

I have a good collection of Mills engines.

The "Currie" Mills made in India by Aurora.
The one in "black" I purchased in 1991 and the "silver" one I purchased in 2005.
I have no less than six (at one time -- and have lots of parts) of the Aurora diesels.
Irvine Mills .75 replica Aurora10

The Russian made Mills 75
The P-75 Replica Mills ( not to be confused with the Doonside Mills)
I have four of these engines.
Irvine Mills .75 replica Doonsi10

Then the Bodo Replica Mills from CS
I have eight of these engines.
Irvine Mills .75 replica Cs_mil10

Then the Irvine Mills
I have two of these that I purchased from Tower Hobbies in the late 1980's
Irvine Mills .75 replica Irvine13

And the Limited Edition Irvine Mills diesels --- the 0.75 and the 1.3
Irvine Mills .75 replica Irvine14

The Aurora made Mills were a hit and miss for quality, bad compression, poor fit, and rough finish.
The black paint tried to hide some of the poor looks of the engine.
It was one of those cheap engines you bought three of and mixed and match parts to get one good engine after some work.

The best (and hard to get now) are the Bodo Mills. Excellent fit, finish, and a strong runner!

By the way oldenginerod the conrod length from center of crank to center of piston wrist pin is .80" (20.33mm)
I've had to make a few over the years.
To make one, I use tempered 7/32" round bar stock, taper it a little towards the piston side.
Then file flat spots on both ends then drill the two holes for the piston wristpin and crankshaft at .80" on center.
New connecting rod in about an hour (or so).

I have used a 8x4 Cox Gray prop on my Mills 75 engines.
One thing I did notice is the serial number on your engine. Your's is  serial #2741
My engine has the serial #2724
Irvine Mills .75 replica Img_0071
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Post  Grosvince Sat Mar 27, 2021 2:07 am

Nice collection. Our Irvine engines seems to have quit the factory in the same batch ! Did yours went with a blue tank ?

Regards
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Post  sosam117 Sat Mar 27, 2021 6:40 am

@Grosvince wrote:Nice collection. Our Irvine engines seems to have quit the factory in the same batch ! Did yours went with a blue tank ?

Regards

No,
I messed up the old tank when I was cleaning it (when I was younger).
I used some Glow fuel to clean the diesel fuel residual that was left in the tank.
The tank soften up because of the glow fuel. Maybe cause of the alcohol, or nitro, or both?

Found a replacement fuel tank on Ebay and purchased "two" of them. They fit better than the original tank did.
The replacement tank works just as good as the original. It's a light blue instead of a opaque "clear" colorl
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Post  DingBatSplat Mon Apr 12, 2021 5:20 am

Irvine Mills .75 replica Irvine10
You have the Mills .75 Mk1 version with a plain bearing crankshaft. A very limited number of Mk11 versions were made that had a single ball race by the crank web and plain bearing front. External distinguishing signs are the squared of exhaust port area, similar to the 1.3. The picture is of the one in my possession. If you see one for sale grab it as they are rare. Consequently, unless the seller doesn't know what he has, it will be expensive.
A good prop for the Mills .75 Mk 1 is a 7X5 (IIRC this was the preferred prop in the 'Tomboy' competitions).
HTH
PS. First post on here I think although I've been 'lurking' for years.
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Post  Oldenginerod Mon Apr 12, 2021 5:29 am

Well thanks DingBatSplat.  Glad you finaly decided to join the conversation.  Thumbs Up
That's the first I'd heard about a ball-race version.
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Post  sosam117 Mon Apr 12, 2021 7:03 am

@Oldenginerod wrote:Well thanks DingBatSplat.  Glad you finaly decided to join the conversation.  Thumbs Up
That's the first I'd heard about a ball-race version.

My Limited Edition Mill engines have the ball race in them.
The ball race .73 have square top, similar to the 1.3 engines.
Also you can see the slight bump on the front of the crankcase

Irvine Mills .75 replica Irvine15
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