Bodywork, Paint, Interior, Trim, & Wiring

discussions about bodywork, paint, interiors, trim, audio, electrical components, wiring, etc.

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mansep2
Paul Mansell

(2 posts)

Registered:
03/22/2015 11:21PM

Main British Car:


Fender vents
Posted by: mansep2
Date: March 22, 2015 11:37PM

I have recently completed my V6 swap and am overall pleased with how things have gone. I want to turn my attention to ensuring that as much hot air is removed from the engine bay as possible without putting in hood vents or exterior fender vents. Essentially keep the exterior as stock as possible so the car is a sleeper, sheep with a wolfs engine so to speak.

I have been reading that a good way to go is to put vents in the inner fenders through to the wheel wells but wondering where to cut them in and how to finish them off. I don't have the exhaust going through this area so was thinking of putting some form of louver there instead.

Has anyone done this, what did you use, where and how much to cut out without structural issues. any pointers would be great.
20141102-engine bay.jpg


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5648 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Fender vents
Posted by: BlownMGB-V8
Date: March 25, 2015 09:18AM

Several people have done this. Probably the best location is going to be in the relatively large mostly flat area behind the suspension. Loads are spread out in that area and forming trim will be easier. I'd stay away from the more contoured sections. The forming there allows the metal to carry higher loads so you should try to avoid weakening it. The area in front is another possibility, giving a shorter path out from the radiator.

One other consideration. If you use the typical RV-8 location it means a simpler path should someone wish to install a V-8 on down the road.

Jim


88v8
Ivor Duarte
Gloucestershire UK
(607 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Fender vents
Posted by: 88v8
Date: March 25, 2015 04:03PM

Does this actually achieve very much?
Typically, the wheel arches would be a high pressure area when the car is moving, and have minimal airflow when it's not.

Ivor


Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: Fender vents
Posted by: Simon Austin
Date: March 25, 2015 04:24PM

For an idea of where to cut holes in the inner fenders, here's photos of my car prior to installing the engine with RV8 headers.
RV8 headers 1 - Copy.JPG
RV8 headers 2 - Copy.JPG


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5648 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Fender vents
Posted by: BlownMGB-V8
Date: March 25, 2015 09:16PM

Ivor, I think you have that backwards, the wheelwell is a low pressure area and will suck the hot air out of the engine bay when moving. And yes, quite a few owners have reported very significant improvements in cooling with the holes. Incidentally, the airflow out of the engine compartement is generally enough to prevent splash from the tires from entering the engine bay.

Jim


britcars
Phil Ossinger
New Brunswick, Canada
(320 posts)

Registered:
02/02/2009 07:58PM

Main British Car:
1977 MGB Roadster, Rover 3.5 ADVENTURE BEFORE DEMENTIA!

authors avatar
Re: Fender vents
Posted by: britcars
Date: March 26, 2015 01:33PM

Paul, here's what I used. Was able to scrounge an old locker from a golf club locker room. The remains of the locker now hold paint in a friend's shop. My car is a '77 with a chrome bumper conversion and a Rover 3.5 and an early Mustang radiator. I've never had any issues with overheating.
Louver 07.jpg
Louver 4.jpg


MGBV8
Carl Floyd
Kingsport, TN
(3496 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Fender vents
Posted by: MGBV8
Date: March 26, 2015 08:05PM

The general consensus is that they very much do help with getting the trapped & heated air out of the engine bay.

I have seen heavy mesh screen welded in where Phil did his (ala Kurt Schley), to louvers to real fender exit louvers. Or RV8 headers with a bit larger hole. Personal preference & style.

Boating louvered vents come in a nice variety of shapes & styles that could be adapted for this purpose.



Moderator
Curtis Jacobson
Portland Oregon
(4372 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Fender vents
Posted by: Moderator
Date: March 29, 2015 11:38AM

Carl said: "I have seen heavy mesh screen welded in where Phil did his..."

Ref: early 1970s Aston Martin V8
http://www.britishv8.org/Other/JohnTargett1/JohnTargett1-L.jpg


mgb260
Jim Nichols
Sequim,WA
(1915 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Fender vents
Posted by: mgb260
Date: March 31, 2015 05:02PM

A set of these welded where the RV8 holes are will let the heat out:

[rodlouvers.com]


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