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Bonnet extensions plus8 experience? #707345
20/06/21 11:40 AM
20/06/21 11:40 AM
Joined: Aug 2011
Posts: 10
Zurich, Switzerland
M
Menm Offline OP
New to Talk Morgan
Menm  Offline OP
New to Talk Morgan
M

Joined: Aug 2011
Posts: 10
Zurich, Switzerland
Try to increase bonnet airflow, are the bonnet extensions any good?

Re: Bonnet extensions plus8 experience? [Re: Menm] #707348
20/06/21 11:51 AM
20/06/21 11:51 AM
Joined: Jul 2007
Posts: 20,760
Suffolk
John V6 Offline
Brooklands Register contact
John V6  Offline
Brooklands Register contact
Member of the Inner Circle

Joined: Jul 2007
Posts: 20,760
Suffolk
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
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: Bonnet extensions plus8 experience? [Re: Menm] #707349
20/06/21 12:21 PM
20/06/21 12:21 PM
Joined: May 2010
Posts: 8,111
Llanelli
sospan Offline
Talk Morgan Guru
sospan  Offline
Talk Morgan Guru

Joined: May 2010
Posts: 8,111
Llanelli
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!


Red Plus8
Re: Bonnet extensions plus8 experience? [Re: Menm] #707361
20/06/21 01:27 PM
20/06/21 01:27 PM
Joined: Jul 2020
Posts: 53
Cheshire
F
Fus969 Offline
Just Getting Started
Fus969  Offline
Just Getting Started
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Joined: Jul 2020
Posts: 53
Cheshire
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

Re: Bonnet extensions plus8 experience? [Re: Menm] #707372
20/06/21 02:34 PM
20/06/21 02:34 PM
Joined: Sep 2014
Posts: 2,003
London
MOG 615 Offline
Talk Morgan Expert
MOG 615  Offline
Talk Morgan Expert

Joined: Sep 2014
Posts: 2,003
London
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.
Re: Bonnet extensions plus8 experience? [Re: MOG 615] #707426
20/06/21 07:36 PM
20/06/21 07:36 PM
Joined: Jul 2007
Posts: 26,119
Cheltenham, Glos. UK
Graham, G4FUJ Offline
Salty Sea Dog
Graham, G4FUJ  Offline
Salty Sea Dog
Member of the Inner Circle

Joined: Jul 2007
Posts: 26,119
Cheltenham, Glos. UK
Originally Posted by MOG 615
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! laugh2


Graham (G4FUJ)

D8921 L44FOR '93 4/4 Giallo Fly 2 seat smile
'90 LR 90 SW
'06 Saab 9-3 Convertible
Re: Bonnet extensions plus8 experience? [Re: Menm] #707445
21/06/21 06:58 AM
21/06/21 06:58 AM
Joined: Dec 2014
Posts: 200
P
PHZI Offline
L - Learner Plates On
PHZI  Offline
L - Learner Plates On
P

Joined: Dec 2014
Posts: 200
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.
Re: Bonnet extensions plus8 experience? [Re: John V6] #707550
22/06/21 05:47 AM
22/06/21 05:47 AM
Joined: Aug 2011
Posts: 10
Zurich, Switzerland
M
Menm Offline OP
New to Talk Morgan
Menm  Offline OP
New to Talk Morgan
M

Joined: Aug 2011
Posts: 10
Zurich, Switzerland
Thanks will do


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