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  • April 13, 2021, 08:09:02 PM

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Author Topic: Irvine 40 mkII  (Read 405 times)

Offline Michael Millard

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Irvine 40 mkII
« on: March 28, 2021, 07:48:13 PM »
I just picked up a new Irvine 40 mkII side exhaust on Ebay the owners manual that came with it lists only Castor based fuels. What would people suggest for brake-in and for stunt use.


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Offline RandySmith

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Re: Irvine 40 mkII
« Reply #1 on: March 28, 2021, 09:30:43 PM »
I just picked up a new Irvine 40 mkII side exhaust on Ebay the owners manual that came with it lists only Castor based fuels. What would people suggest for brake-in and for stunt use.

Do not use  more  than  1/2  castor  of you  oil type, it will run better  last longer  on  part  synthetic
You can read   the fuel article  pinned  at the  top of this  forum

Randy

Offline Air Ministry .

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Re: Irvine 40 mkII
« Reply #2 on: March 28, 2021, 10:13:30 PM »
The Old OS H40S & FSR intakes fit . A 10 x 4 three blade works , but underproped .

Online Brian Hampton

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Re: Irvine 40 mkII
« Reply #3 on: March 29, 2021, 07:00:18 PM »
There's a Peter Chinn test of the mkII at http://sceptreflight.com/Model%20Engine%20Tests/Irvine%20Sport%2040%20Mk2%20%282%29.html . Note that it uses a steel liner and Dykes ring plus has a very high compression ratio so wouldn't tolerate too much nitro. As for castor, being British then most likely the castor used (and recommended by Irvine) would be Castrol M which is very good stuff.

Offline Michael Millard

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Re: Irvine 40 mkII
« Reply #4 on: April 02, 2021, 09:20:25 PM »
Thank you everyone for the information. I've gotten some break-in runs on it with the irvine venturi with the goofy needle valve with Sig champion 15% nitro 20%50/50. With this setup I can't get the engine anywhere close to 4 cycling. I live at 6300 ft which is why I have 15%. I'm guessing the 15% was the problem getting it to slow down, I have methanol and sig castor that I think I'll mix 75/25 for the rest of break-in. Also have a 40H venturi  but can't find a needlevalve/spraybar for. Thanks again guys for the info.
Michael Millard

Offline Motorman

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Re: Irvine 40 mkII
« Reply #5 on: April 03, 2021, 07:43:17 AM »
If it won't 4 stroke the venturi's too big or the needle valve won't pass enough fuel.


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Offline Air Ministry .

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Re: Irvine 40 mkII
« Reply #6 on: April 05, 2021, 06:21:45 PM »
Yea, typical English engine is set up for ' Straight ' , No Nitro fuel  . So may well want a few gaskets under the head . Ive had one ' hemi'd ' just for the heck off it .

The ENYA & ST 60 Spray bars fit that intake, youd think the Irvine one might , guess its through higher like the HP ones . Unless it was a early r/c carb spraybar from 65 that went right thru the carb .
« Last Edit: April 07, 2021, 12:10:32 AM by Air Ministry . »


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