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eggen
Switzerland
34 Posts |
Posted - 02/08/2024 : 11:33:00
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Hi all
I am after an ENV75 or similar, for my MG PB, any condition considered. Chassis number PB0434
Stefan |
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coracle
United Kingdom
1973 Posts |
Posted - 02/08/2024 : 14:13:07
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There are a few Armstrong boxes on eBay at the moment, one already set up for an MG, advertised by Big Tony who I also think is a forum subscriber.
The Armstrong box is probably a bit big and heavy for a 4 cylinder car though and requires the hand brake cross shaft to be modified.
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Edited by - coracle on 02/08/2024 14:14:58 |
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Nick Feakes
USA
3411 Posts |
Posted - 05/08/2024 : 14:09:40
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Stefan Greg has two for sale. See "Parts for Sale"
Nick
Webmaster |
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coracle
United Kingdom
1973 Posts |
Posted - 05/08/2024 : 14:34:44
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Nick, those are both manual; it's a preselector that Stefan is after. |
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DK6780
United Kingdom
291 Posts |
Posted - 05/08/2024 : 16:58:48
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quote: Originally posted by coracle
The Armstrong box is probably a bit big and heavy for a 4 cylinder car though
That's an understatement! The Type 75 is so called as it's rated for a 75 BHP output, and has much more suitable ratios unless the Armstrong box has been modified.
Are you looking for a rebuilt box or are you willing to rebuild one? Also does it need to already have a bell housing and what ratios? |
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coracle
United Kingdom
1973 Posts |
Posted - 05/08/2024 : 17:54:21
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![](https://www.triple-mregister.org/forums//uploads/coracle/202485175250_IMG_1990a.jpg) I understand that the ENV has a maximum rated torque of 60 ft lb which represents 60bhp at 5252 rpm.
Clearly it was capable of standing up to much more when one considers the power output of the K, Q and R types but had its limitations, hence the torque limiting clutch introduced on the R types.
The Armstrong is a bigger heavier box which although not as sophisticated as the ENV having only plain bearings on the planet wheels rather than the ENV's needle rollers, will take more torque and thus power. This is why many K3s and other 6 cylinder cars have moved to Armstrongs. Armstrongs have been installed in 4 cylinder cars but a bit more work is required over the relativly easy swap to an ENV.
https://www.flickr.com/photos/mg-pa-gearbox-modification/
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Edited by - coracle on 07/08/2024 13:43:45 |
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lordrob
Belgium
227 Posts |
Posted - 05/08/2024 : 19:51:42
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Hi Stefan, I have an unrestored ENV75-preselect gearbox from a Riley that I'm willing to sell, eventually together with a bell housing. If your interested please let me know and I can send you some pictures during NEXT week. Roby
lordrob |
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coracle
United Kingdom
1973 Posts |
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Westbury
United Kingdom
2050 Posts |
Posted - 07/08/2024 : 16:18:00
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Hello, Stefan. For modification of the Riley edition of the E.N.V. Type 75 for use in an MG, please see my article in the 2020 MMM Yearbook. Chris |
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