Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Cold Air Intake for a +8?

I'm looking for a Cold Air Intake for my 1998 +8 with a 4.0 Anyone know where I can get one?

I found this for Range Rovers but don't know which kit mite work the best. Any ideas?
https://www.knfilters.com/mobile/cold_air_intake/land_rover_range_rover.aspx

I made on for my Plus 4. I just bought a suitable ITG filter box and some appropriate tubing from a automotive supplier online and a length of aluminium tube. I had to make up the brackets to support it and modify the radiator surround to get access to the air from the front. I think the ITG filter made the most difference although based on the reported temperature from the engine management system it did lower the intake temperature somewhat especially at speed. The big surprise was just how hot the air is once it gets in.

You may find on a Plus 8 that space is an issue for an air box of an appropriate size.

Dave

I measured the incoming air temp on my 4l plus8. Connected the diagnostic meter and went for a run with live data showing. The ambient air was 15C. Measured incoming air 35C and rising slowly. No high speed racing but mixed roads with a short Mway stretch. The underbonnet temps do go up! The polished stainless airfilter box gets to well above 40C surface temp. The air intake points towards the side louvres but not a good fit/direction.
I am thinking along the lines of the roadster setup with a sealed intake to the side louvres. The roadster has reversed louvres I think.
Routing of pipes elsewhere is not easy due to lack of room. On my old 4/4 the air was taken from the inner wing but the steering column gets in the eay on the plus8. There is more room on the other side of the engine but that needs much more redesign and mods to fit the MAF and filter to the intake plenum.
The roadster option looks easier.
There are photos somewhere of the set up......anyone got some?

Sospan, I had a Roadster S1, the idea is good but at that region you have huge underpressure. I'm not sure if it is an ideal solution.

Heinz is correct. There's a film somewhere with strips of material which show excessive turbulence around the side louvres.

It is said that the heater box area is the best place, being a high pressure zone.

Heinz, yes I have seen the video showing airflow. I agree with Dave about the heater box area giving a "positive" pressure.
But...on my Plus8 the air being sucked in is not pressurised but I guess at normal pressure. It is completely underbonnet so airflow around the engine itself is what it gets. My guess is just sucking in the hot air as the exhaust manifold is below the open end of the intake. I doubt if there is any positive pressure under the bonnet.
Just guessing, but I think the engine would suck in air through the louvres , even rear facing ones, if a good seal could be made to the inside bonnet surface.
It would be nice to see a repeat of the airflow test for a roadster to see if the wool threads show strong airflow in through the louvres. Care though not to suck in the wool threads!

It would involve butchering a half of the bonnet but would it not be possible to cut a hole and install a forward facing scoop on one side? Is a half bonnet an expensive spare part?

That said I have looked at a number of pictures of +8 racers and none seem to be showing non standard air intakes.

I found this link below, just to have an idea if the air intake could be relocated to the heater box area. See the picture. BTW starting such a project they probably had one or two thoughts about a good location regarding the air intake, concerning what is possible at all in a tight Plus8 engine bay. And of course only they know if it works.

http://www.gomog.com/phoenix/phoenix.html

Probably around £500 plus Howard....and you can't just pluck a spare one off the shelf.

Hmmmmm......I do have a certain Italian owners bonnet sitting up in my garage rafters 😈

Heinz, the gomog Phoenix photo shows the layout under the bonnet quite well. The airbox is the same as mine ( I have no other "bling" though!). I have a K&N in mine too.The air intake pipe shown points generally towards the bonnet louvres but is a bit high and not directly at them hence it draws in the hot air coming from the engine and rising up from the exhaust manifold below it. A warm place indeed. The plenum intake is the other side of the engine. There is much more room that side to put a cool air route but plumbing is needed to accomodate the MAF etc.. Not an impossible job.
The benefits of colder air are estimated at 1% extra bhp per 7deg lowering of temperature. (Taken from Graham Bell's book on engine tuning.) So, possibly 5-10 extra bhp as a rough guide. A nice little tweek as not too ££££ but a bit of fiddling to route the intake pipework. A sharp bend will be needed too.