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minorv8
Jukka Harkola

(208 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Coil packs under the intake manifold
Posted by: minorv8
Date: March 22, 2020 01:23PM

I am (slowly) making a new plenum for my next engine. My current setup has the coil packs mounted on the firewall just behind the intake manifold. This is not perfect location, especially when I need to remove the engine. With the new intake there will be even less space. I have been thinking about mounting the coil packs underneath the plenum since there is plenty of space.

Now, the question is would there be any ill effects, e.g due to heat from the engine ? My engine room is crowded enough so finding a better location is a bit challenging.

I'll upload some photos once I have them reduced in proper size.


88v8
Ivor Duarte
Gloucestershire UK
(804 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Coil packs under the intake manifold
Posted by: 88v8
Date: March 23, 2020 05:14AM

The two prime causes of coil failure... vibration, heat.
Custom cars, with a clean engine bay, presumably mount them in the cabin.

Use the space under the plenum for other purposes.
[www.wikihow.com]

Ivor


minorv8
Jukka Harkola

(208 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Coil packs under the intake manifold
Posted by: minorv8
Date: March 23, 2020 10:01AM

Plenum_1.jpg

This is what my plenum will look like. I am still thinking which throttle body to fit. I currently have a 75 mm Mustang throttle body (chinese knockoff) but its linkage does not fit my plenum design. I need to get creative with the thermostat housing as well.

Coil pack.jpg

Here is a single coil pack stashed underneath the plenum for demostration purposes. This is a injection Mini coil, the Bosch coil packs I have are a touch smaller.

TVR AJP V8 have the coil packs in the lifter valley and in a very tight space. I doubt that my setup would be that bad. Factory LS coils are mounted to the valve covers and they see a fair amount of heat and vibration too.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5966 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Coil packs under the intake manifold
Posted by: BlownMGB-V8
Date: March 23, 2020 11:17AM

Pretty big plenum. Will that cause any problems?

You should be able to get by with putting the coils there if you allow some airflow through the area I would think.

Jim


Blown v8
Bryan Phipps

(63 posts)

Registered:
03/10/2013 04:52PM

Main British Car:


Re: Coil packs under the intake manifold
Posted by: Blown v8
Date: March 23, 2020 12:22PM

Iím thinking of putting mine on the block,under the headers, plenty of room,plenty of airflow, headers will be cam coated to help,
And itíll keep the leads short, and clean looking.


minorv8
Jukka Harkola

(208 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Coil packs under the intake manifold
Posted by: minorv8
Date: March 24, 2020 04:21AM

Jim, there are trumpets inside the plenum but yes it is a bit big. The manifold runners kind of dictated the design. I hope that the engine size will help some (5+ litres).

Trumpets.jpg



Edited 1 time(s). Last edit at 03/24/2020 08:23AM by minorv8.


DiDueColpi
Fred Key
West coast - Canada
(1267 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Coil packs under the intake manifold
Posted by: DiDueColpi
Date: August 21, 2020 10:05PM

I don't see any problems with placing the coil packs under the plenum Jukka.
Almost every COP engine places their coils in the hottest place on earth and then covers them up with some pretty plastic to make sure that they are miserable.
They seem to last just fine.
Cheers
Fred



MGBV8
Carl Floyd
Kingsport, TN
(3991 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: Coil packs under the intake manifold
Posted by: MGBV8
Date: August 22, 2020 10:32AM

Great to see you back, Fred! We were worried about you.


minorv8
Jukka Harkola

(208 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Coil packs under the intake manifold
Posted by: minorv8
Date: August 23, 2020 05:26AM

OK, thanks Fred. I just need to fabricate a bracket for the coil packs. There is a photo of my thermostat housing that I welded together from some scrap laying around. There are bungs for an EFi coolant temp sender and a mechanical temp gauge.

Thermostat housing.jpg



Edited 1 time(s). Last edit at 08/23/2020 05:27AM by minorv8.


Bland
Tim Bland
Oregon
(36 posts)

Registered:
01/22/2017 11:15PM

Main British Car:
1980 Triumph TR8 Rover 3.5

authors avatar
Re: Coil packs under the intake manifold
Posted by: Bland
Date: August 24, 2020 11:17AM

What ECU will you be running?. I need to build a thermostat housing similar to yours for my ITB manifold.


minorv8
Jukka Harkola

(208 posts)

Registered:
04/08/2009 06:50AM

Main British Car:
Morris Minor Rover V8

Re: Coil packs under the intake manifold
Posted by: minorv8
Date: August 24, 2020 11:57PM

I have a Haltech E6X, been running that for a couple of years.


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