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SORN
by OldSkrote - 31/07/25 02:07 PM
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New
by Rex_tulips - 30/07/25 07:59 PM
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Forums34
Topics48,375
Posts813,505
Members9,215
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Most Online1,046
Aug 24th, 2023
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Joined: Nov 2015
Posts: 7,914 Likes: 243
Just barreling along Talk Morgan Guru
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OP
Just barreling along Talk Morgan Guru
Joined: Nov 2015
Posts: 7,914 Likes: 243 |
Inspired by Jon's much earlier posts relating to getting more cooler air into the 3.7 Roadster's air box, I've also cut a 4" hole in the box but then used a ducting elbow that came from Screwfix to help draw cool air from the side vents in the bonnet. A quick spray of matt black and I think it looks quite tidy. ![[Linked Image]](https://www.tm-img.com/images/2019/06/19/P1070208.md.jpg) I've left the original hole in the base of the box open, but I'm hoping that this - very cheap! - addition may improve things. Only a proper dyno test will confirm one way or the other whether there's any difference in performance, as I must say I can't notice any, but I just feel that anything's got to be better than the standard arrangement. Borrowed your idea sid. First person I showed it to suggested an angle on the rectangular inlet to better align with louvres. ![[Linked Image]](https://i.imgur.com/1KcAANc.jpg) Next plan is to somehow block off original air inlet route to reap full advantage of cool air. Richard, mine is still 'open' at the base, my reasoning was that if driving in heavy rain or a large splash from a pothole if sucked into the airbox scoop could drop out of the bottom without too much being drawn into & through the air filter
Jon M
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Joined: Dec 2011
Posts: 1,943
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Dec 2011
Posts: 1,943 |
Button, you are right that a modern EFI always can balance air and fuel. But if the air is very hot it will dose less fuel to keep the balance of the mixture so the result means less power. If the air is colder the EFI will also keep the same balance but it will deliver more fuel to do so and you have more power. As far as I know, this applies at least to the partial load range. For full throttle one should adjust the ECU to the air volume and temperature.
I am only an interested layman and other TM members can explain this topic much better but in one point I am very sure, your your brain works totally very well and it is in best order:) I would think the same thing happens when a Morgan with EFI gains altitude. Doesn't the EFI self adjust for Barometric Pressure?
Button
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Joined: Dec 2017
Posts: 2,041 Likes: 71
Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
Posts: 2,041 Likes: 71 |
Button,
Yes, the EFI self adjusts with altitude. Living at 9000 feet and often driving mountain passes well over 10500 feet I can attest to this. I still have my adapted cold air intake system from behind the passenger wheel, as illustrated in a previous thread.
Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
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Joined: Aug 2017
Posts: 501 Likes: 2
Talk Morgan Regular
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Talk Morgan Regular
Joined: Aug 2017
Posts: 501 Likes: 2 |
When I was a teenager in the norwegian coast I had a small speedboat with a 20 hp outboard. I remember I noticed that the boat was slightly faster in the cool evenings and nights, and even more so when I took the lid off the outboard while running. I had friends with similar boats, we were racing each other so it was easy to detect the increase in speed. So I do believe in delivering cold, dense air to the engine - and for reasons well explained here I do not have so much faith in the inverted louvre/trumpet system. I would like to try the "above the rad" approach, but the available space seems restricted. To those of you who has tried this, have you made some sort of scoop or have you just squeezed a tube in?
Robbie the Norseman
2004 V6 Roadster
Sherwood green
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Joined: Feb 2016
Posts: 7,948 Likes: 218
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,948 Likes: 218 |
Reminds me of my first bike a Yamaha AS1, 125cc two stroke twin. Dropping the clutch from lights in cold weather it would lift the front wheel 
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Dec 2008
Posts: 21,871 Likes: 168
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 21,871 Likes: 168 |
The current trads have more space above the radiator than the cars with metal radiators.
The plastic radiator is mounted lower.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Dec 2011
Posts: 1,943
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Dec 2011
Posts: 1,943 |
Button,
Yes, the EFI self adjusts with altitude. Living at 9000 feet and often driving mountain passes well over 10500 feet I can attest to this. I still have my adapted cold air intake system from behind the passenger wheel, as illustrated in a previous thread. Can You give Me some idea of how to find your "Previous Thread". Spent some time looking at EFI systems this morning. Jeep gets fresh air in front next to rad. Toyota gets it in front of Driver side tire. Best as I can tell Corvette gets it from on top of rad. Looks like Morgan just tucks into any old place to get rid of it.
Button
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Joined: Sep 2009
Posts: 7,342 Likes: 91
Talk Morgan Guru
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Talk Morgan Guru
Joined: Sep 2009
Posts: 7,342 Likes: 91 |
'14 4/4 graphite grey
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Joined: Feb 2016
Posts: 7,948 Likes: 218
Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,948 Likes: 218 |
Hope you don't mind this suggestion Heinz. If you wish to offer a link to a specific post in a thread, scroll to that post and click on the post number, top right with # prefix. The post will reload, you can then copy the URL displayed at top of your browser and paste that as your link.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Sep 2009
Posts: 7,342 Likes: 91
Talk Morgan Guru
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Talk Morgan Guru
Joined: Sep 2009
Posts: 7,342 Likes: 91 |
Thank you Richard, I had the time to use the edit function and I followed your advice above to change my post.
'14 4/4 graphite grey
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