Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 under the bonnet cooler

Yeah, and Morgan blows the hot air back over the heads. Makes little sense to me.

They put those fans on all the police bikes in our town. All the officers hate them because it blows that hot air on their legs. It is really a ridiculous set up but they have to do something to get air across those cylinders. I am looking into this cooler set up. I would like to have it on the front of the car with a fan assist. Not opposed to having it under the bonnet, it is a clean set up. The oil tank gets hot too. I remember my first softail that oil tank sat right under the seat and the oil fill spout would touch your leg. Rule number 1. Never ride a softail Harley in shorts. Rule number 2. Never forget rule #1

The plastic fan shroud is really effective, it routes air behind cylinders at speed and aids cooling.

I tried several coolers under the bonnet, but never lowered the oil temperature more than 20 degrees. You would have to make an intake air duct and then the exhaust one to make it work, IMHO. You can probably use a morgan-branded footwell lockbox for that purpose and cut exhaust holes in the floor. That would be a really clean setup.

Eventually went with the MorganCustom cooler (did not like the look), and it works fantastic! Highly recommend.

The parts I used was a DERALE heat sink cooler I got from summit racing. I got the fan from JAGG (and had to fabricate a couple of brackets). I cannot recall the make of the temp gauge, but got that from summit as well. The fan switch was from JAGG as well.

I have found the urban fan does a pretty good job keeping the engine cooler when sitting in traffic. The hottest it ever got (pre cooler) was on a day in the mid 90's and the oil temp was about 240.

Yesterday I went up some back roads climbing to the parkway and was in third gear nearly the whole way. The temp got up to about 214 and only occasionally did the fan cycle off. Except the couple of times I stopped to check my GPS.

I think all know that being in a lower gear (in this case going up hills) the engine runs a lot hotter.

The louvers are towards the front. would make more sense (not a word I use with Morgan) if they were toward the rear.

The one thing I really did not like with Ultracool (and JAGG would be the same) is the step down to 3/8 hose and the lower pressure side of the system.

I put love jugs on my wife's heritage softail, but it was he fan assisted JAGG oil cooler that made a difference on the oil temps

I'm going to be something of a dissenting voice here. I will agree that there are thermal issues with air cooled engines, particularly when at low speed or stationary but some of the oil temperatures being bandied about here are way too low to drive off the combustion contaminants, in particular the water. Running a synthetic oil at 230 to 240F isn't so much a problem as a necessity to keep it in good condition. Running at 180F might be a good thing if you're racing and changing the oil after every meeting but on the road I wouldn't want to try for the 3000 mile change interval.
Additionally, the amount of cooling that the oil contributes versus air flow is questionable for the cylinders and heads; there's no cooling galleries around the cylinders, just fins on the outside remember. The MMC cooling fan seems to do a pretty good cooling job when it runs as programmed and, as has been pointed out before, the cowling that it fits in is very good at channelling the air flow when moving at speed around the cylinders giving more even cooling which is arguably closer to the original design assumptions for a bike engine.
Don't worry, nobody has to believe or even agree with me, and I don't even have the cooling fan on my M3W never mind an oil cooler and I live in a cooler climate than many on here. I have driven it hard in 95F conditions and it didn't seem in the least bit troubled unlike myself, I was a nasty sticky, dehydrated mess by the end of the day.

To objectively back up what Callum here is the test data MMC published when they introduced the cooling fan in 2014.

I agree that at speed the engine stays at a good temp. The highest I ever saw the oil temp was climbing (and I mean climbing) to the top of Fancy gap on a day in the high 90's. Even then the oil got to only ~230. Yesterday the couple times I stopped (temp outside mid-60's) the urban cooling fan quickly dropped the oil temp. While I live in the mountains here, we do have hot summer days.... and thankfully I am no longer in Oklahoma which was HOT and HUMID!

I enjoyed the read. If you want to get into an oil war, go on a v-twin site and just mention oil change or synthetic vs Dino oil. Grab some popcorn and watch the posts. These v-twins run hot. It is the nature of the beast and it doesn't surprise the engineers that designed them. However, sitting in traffic they get upset with heat and start doing all kinds of fun things! With that being said, I am only concerned about traffic situations. I know that if I.am going to do a toy run or parade ride, I take a bike with a radiator! I have read somewhere, about oil viscosity break down and the temperature where that occurs. It has been some time ago but I am thinking that doesn't start to occur until 275 degrees and up, and that was with regular Dino oil not this new synthetic oil on the market. Most of these big displacement v-twins come with oil coolers installed on the bikes now, if there is no water cooling. I guess I said all that to say this, I just want some cooling happening when I am stuck where I can't get air across the engine. Are you saying that the fan blowing on the cylinders is sufficient for cooling in stop and go city driving? I am just trying to figure it out since I do not have a temp gauge on the car

Thanks for the information.