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Glitch
by BobtheTrain - 18/07/25 05:47 PM
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Forums34
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Aug 24th, 2023
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Joined: Aug 2011
Posts: 10
New to Talk Morgan
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OP
New to Talk Morgan
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Try to increase bonnet airflow, are the bonnet extensions any good?
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Joined: Jul 2007
Posts: 26,746 Likes: 419
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 26,746 Likes: 419 |
You might want to read this on GoMog if you haven't already. I have never had a +8 but lots of folk use the extensions. GoMog +8
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: May 2010
Posts: 9,285 Likes: 69
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,285 Likes: 69 |
I use them on mine in summer. I haven’t done any proper tests to measure temperatures under the bonnet but I do get an impression that they do help in that the fan seems to cut in less frequently. That may be due to better airflow out of the engine bay reducing some back pressure reduction allowing easier airflow through the rad(?). I took them off for the winter. When they go back on I will do some test runs to see if the incoming air to the filter is lower plus a thermometer to get some readings.
I do get comments about the bonnet not being closed!
Plus Four MY23 Furka Rouge
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Joined: Jul 2020
Posts: 59 Likes: 1
Just Getting Started
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Just Getting Started
Joined: Jul 2020
Posts: 59 Likes: 1 |
I’ve had the rad conversion and raised the number plate so it’s halfway up the bumper on my +8 and no overheating issues anymore
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Joined: Sep 2014
Posts: 2,272 Likes: 7
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,272 Likes: 7 |
I do recommend the bonnet extensions, they will help in the summer.
The only downside is that you will get lots of "helpful" bystanders and other drivers kindly informing you that your bonnet is open!
I have the Librands crossover manifolds installed so there is probably a lot more heat generated from them than standard, and I find the standard fan (with an override switch), a deeper alloy radiator, and the bonnet extensions cope pretty well. Again the only downside is that the fan seems noisier than the engine at times.
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
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Joined: Jul 2007
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Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,413 Likes: 177 |
I do recommend the bonnet extensions, they will help in the summer.
The only downside is that you will get lots of "helpful" bystanders and other drivers kindly informing you that your bonnet is open!
And marshals at hill climbs and sprints... As a course controller, no need to ask how I know! 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW
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Joined: Dec 2014
Posts: 216 Likes: 2
L - Learner Plates On
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L - Learner Plates On
Joined: Dec 2014
Posts: 216 Likes: 2 |
From a personal point of view, I could never detect any measurable difference. For me, the biggest difference was fitting an aluminium rad.
Last edited by PHZI; 21/06/21 06:59 AM.
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