Tag Archives: Cooling

Gawsworth… Not

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Well, that didn’t go as planned! Raining when I left for Gawsworth Hall Youngtimers show this morning, but hood down & indeed the rain stopped a few minutes later. Having got the other side of Hale Barns I realised I had forgotten my entrance tickets & went home to pick them up.

Unused. Grrr…

Half a mile into the second journey the coolant boiled over & dumped onto the A538 with the engine going into “Protected Mode”. Really rather disappointing given how good the car has been recently. Anyway, six litres of water later (courtesy of a very nice, patient householder on Hale Road!) & some engine checks using the Torque ODB2 app I limped back home again.

My trusty ODB2 sender. I might not have a clue what’s going on with the engine, but it does!

No idea what happened or why, but decided against trying for Gawsworth a third time. A shame as, apart from catching up with other owners, I was really looking forward to seeing the Morrison’s LM following the conversion from a Spyder to a Coupe & the respray. Knowing Debbie & Darren it will be immaculate. And very purple!

Fans… AGAIN

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Well the Mantis managed two local journeys before something went wrong. Coolant temperature went above 120 degrees C. No fans. Fortunately this was not far from home & got back. Ran the car today on the drive & it did the same thing. Fan fuse is fine so f**k knows.

The emotional rollercoaster that is Marcos ownership continues.

Cooling

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Day… whatever of Covid-19 lock down & the car still not moving (electrics) but thinking ahead to when it is. I am hoping there will be some decent weather left, so… how to improve the cooling on the car? I keep coming back to something Dave Chivers mentioned last year, that when mesh was fitted to the front radiator vents (nostrils of the Dragon!?) the factory saw a 10 degree increase in engine temperature. Yikes!

Although I have increased the size of the holes in the mesh at least twice since I have owned the car, I am going to try the largest mesh I can find. This is black aluminium mesh from Simoni Racing – not cheap but hopefully it will make a difference.

Mesh black aluminium 100x30 cm wide

Just waiting for the postie now to see what it looks like offered up. Then to get it fitted of course, as I don’t have the gunk or tools to cut & replace the current mesh at home.

Not a fan

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Just picked the car up after the cooling fans stopped working again. Unfortunately the contact in the junction block fitted last week by the auto electrician was not a good one, & the resultant power surges melted the Fan relay holder. In the absence of a spare relay holder which fits into the existing modular block, the relay has been wired direct which gets the car back on the road. Something to revisit at a later date however.

It’s been nine weeks since I contacted National Windscreens for a replacement screen as the crack in mine is slowly getting bigger. No outlook on when it may arrive so getting worried it may not be done before the 60th Anniversary at Wroxall in July. The supplier of course could only be Marcos Heritage Spares, so I phoned Rory who explained that Pilkington had moved their manufacturing out to Finland & were having logistics problems. Mine is one of 12 screens he is waiting for from up to four months ago, which is not great! Fingers crossed….

Enlightened

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Gave a recommended local auto-electrician a try & he has fixed the cooling fans (corrosion on junction box behind rad & underneath fan belt) & daylight running lights (earth disconnected in wiring by controller). Result! Just need to wait for the rain to stop now! 🤣☔🙄

Le Mans 24 hour 2017

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Had a great time at Le Mans this year, accompanied once again by my good chum Doug. I suppose this is what everything had been leading up to… the new engine (and the new everything else!).

Tuesday: Met up with Andy & Lorraine Peers in their lovely LM500 (replacing the previous supercharged Mantis) at Knutsford Services on the M6. An straightforward blast down south to the Holiday Inn in Folkestone; weather was great & the M25 clear.

Wednesday: First stop of the morning was at the nearest Services where a very enthusiastic (& easy on the eye!) lady from the Channel 4 production team briefed Andrew & Lorraine on what their program was about & fitted several GoPro cameras inside & outside the LM500. Eventually I decided to kill time by… filling up with fuel (again) which is the default activity of every Mantis owner. (Or polishing, if your name is Partridge). Finally with the Borg-like LM500 adorned with cameras the two cars set off for the Eurotunnel terminal. Here we met up with a couple of older Marcos Mantulas in Eurotunnel departures car park, to travel over around midday. After a diversion to drop off the Channel 4 production company’s cameras, the four cars headed off to Le Mans. We managed to stay together for most of the journey apart from some SatNav-initiated diversions through the centre of Rouen. Arrived at Neuvillette-en-Charnie about 1900 hours & decided to drop into Chateaux Morrison to see Debbie, Darren & the Essex gang who were staying there before heading on to our own gite a mile further. Great to see everyone but then… the Mantis broke down in their driveway (blocking Darren from getting to the pub!). Symptoms were no fuel but with the gauge reading just under a quarter full & numerous fill ups on the way, this seemed unlikely to me. Eventually, given the 30+ degrees temperature, fuel vapourisation was the diagnosis. However, managed to bleed some air from the fuel lines & then filled up with some ancient fuel from Darren, allowing the car to start again & we made it to our own gite a few minutes later.

Thursday: Cleaned the bugs off the front of the car then headed off to the start point of an organised tour of the 1906 French Grand Prix. Hot! Hot! Hot! The car started overheating as we arrived in the car park, & a quick check revealed that the second fan was not kicking in due to the 30A fuse having blown. Fortunately I had some spares that SP Automotive had given me, so a few minutes later the car was sorted & we set off along the route in convoy with Debbie & Darren’s LM500 & Geoff’s ’68 GT.

In the evening there was a Hog Roast organised at the gite with many other Marcos owners attending. The highlight (of the whole weekend perhaps) was the appearance of the Yorkshire Volunteer Band in full military uniform who gave us the most fantastic performance as we gazed on in awe. I think it was probably quite hot in all that kit!

Friday: Today was the big day for the Macros owners… the Classic British Welcome! There were over 70 Marcos in attendance, & while the majority of us were parked outside, there was a fantastic display of Marcos in the exhibition hall. As well as a beautiful example of each model produced, there was also one of the two LMs that raced at Le Mans in 95 & 96. Jay swapped out my Rev Counter (reading half) for the upgraded unit from Smiths/CAI in front of about 200 people (the poser!). I wasn’t that impressed to discover the new unit over-reading x1.15 though, particularly as they had had the unit for 12 weeks.

After catching up with many of the owners & a good chat with both Cor Euser (lovely bloke) & Chris Marsh (also lovely chap!), it was time for the invitation-only Cavalcade into Le Mans… complete with motorcycle escort from the Harley Davidson club. As usual the best bit was winding through the local villages with the streets lined by primary school children energetically waving union jacks. For some reason the cavalcade seemed to be a lot slower than my previous experience in 2004, & the engine temperature started to climb as we reached the outskirts of Le Mans. The weather was HOT but the car was definitely HOTTER! A few minutes later the temperature was around 115 degrees & we reluctantly pulled out of the cavalcade into a side street. Bonnet up, coolant all over road & another melted 30A fuse. Doug & I were philosophical about this as we’d experienced the best bit of the cavalcade, so it was a simple matter of waiting for the engine to cool down, topping up with some precious drinking water (Evian of course… nothing but the best for my Mantis!) & then fitting the last of my spare 30A fuses, before heading back to the gite.

I am of course, lying. There was plenty of swearin’ & cussin’ from me but… heigh ho. I was really frustrated that SP Automotive had not fitted the 50A maxi fuses as requested (although to be fair they didn’t want my car to catch fire!). Jay had not had a single problem with his cooling & had been running with a 50A fuse since day one. ‘Nuff said. You can see more details & lots of fantastic photos on Marcos@CBW here.

On a lighter note, when I purchased the Mantis. they definitely told me it would pull the chicks. I should have read the small print…

Pulling chicks…

Saturday: That very nice man Mr Sherwin whipped out a soldering iron in the morning & replaced the crappy 30A blade fuse with a manly 50A maxi fuse. Job done & no more cooling fan problems. Went to the race & parked with minimal queuing in Parking Rouge. It was Doug’s first time at the 24 Hour after a few visits to the Classic with me, so we wandered around a bit then found our Grandstand seats & settled down for the start of the race. After a few hours we decided to stretch our legs & ambled off along the edge of the circuit, stopping off every now & then to watch the race with the great unwashed. For some reason I then decided it would be a good idea to walk down to Arnage Corner (I blame heatstroke), which was a bit further than I thought! The clue was in the multitude of people on bikes, the stream of shuttle buses & the absence of any other pedestrians I suppose! D’oh! Anyway we got to Arnage Corner eventually & it was packed! An cold beer got Doug back on track & I put away a few bottles of fizzy water as I would need to drive back to the gite later that evening.

The night racing was good fun. We stayed a lot longer than planned which meant queuing for over an hour after midnight to get the last shuttle bus back to the main circuit. As it turned out the bus didn’t go quite that far so we had few minutes wandering around the circuit perimeter before we found an entrance & headed back to our grandstand seats. A very handy landmark that Ferris Wheel!

Sunday: Watched the racing for another hour or two from the Grandstand then returned to the car about 0300 hours & set off on the 45 minute drive back to the gite. Top down so happy days. Slightly less happy to discover we had been locked out of our room at the gite (!) so at 0500 hours Doug & I tried to get some kip on the floor of the dinning hall. This wasn’t particularly successful so we were rather pleased to see Mr Barlow wandering around about 0700 hours, as he was the proud owner of a key. Que a couple of hours zeds before jumping up & heading back to the race. Reached Parking Rouge without mishap & went straight to the grandstand seats (via a bar) to watch the last 2 or 3 hours of the race. Then back to the gite for a posh dinner. The band played again & were awesome again. Lots of nice speeches from lots of nice people then it was off to bed as I was bloody knackered after getting no sleep on Saturday night!

Monday: A quick breakfast then we headed off to Dieppe to catch our ferry. Event free motoring except the stereo had stopped working (?). We arrived in good time then it was onto the ferry & some welcome repast. Offboarding took over an hour & the car was getting hot again but the 50A fuse held up. Finally got through Passport Control then it was a four or five hour drive back to Manchester, dropping Doug off then getting home about 2000 hours.

Had a good time. A lot of driving. A lot of Marcos. Time for a break…

Pre Le Mans cooling

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The two Spal fans arrived at SP Automotive yesterday, so with three days to go before leaving for Le Mans 24 hour, I headed over there this afternoon with the car & some 50A Maxi-fuses to get the overheating sorted out. The plan was to swap out the single Spal straight blade fan for the two curved blade models, fit the additional in-line fan controller & remove the blanking plates from the rear bonnet vents to give somewhere else for the hot air in the engine bay to escape through.

Ryan talked me out of replacing the shaped vent grills with the less aesthetically pleasing (but more more efficient) grill that matches the front vents – so the originals have been retained. We agreed to locate the two new Spal fans in parallel at the top of the radiator rather than offset them; this required some minor grinding of one of the fan frames to squeeze them both in side-by-side, but the end result looked very good (below). The offside fan would continue to be controlled by the ECU (kicking in at 95 degrees), whilst the nearside fan would be controlled by the new Revotec in-line controller, set to about 99 degrees. I left the team to it while I went for a stroll down the country lanes of Cheshire with my daughter, ending up in an Ice Cream farm (not entirely by accident, to be fair!). There was a steady drizzle by this point, but we had a couple of hours to kill so got on with the very British family activity of playing in the rain. Upon returning to SP Automotive, Ryan had finished removing the blanking plates (I can’t watch people with chisels attack my car!), & was sealing the vents back in. In the meantime the fans were fitted & the wired up but I was surprised & a bit annoyed to see a standard 30A fuse fitted, despite my supplying parts & specification for a 50A fuse. The justification for this was that the fan controller was only rated to 30A, and the fan itself was only showing as drawing 2A, but upon pointing out that Spal’s data sheet showed max draw around 33A, I was informed ‘they must be wrong’. Given the time available we agreed to disagree, but I have since found out that SP err on the side of caution in this area, having encountered several fire damaged TVRs, arising from under-specced wiring combined with high amp fuses which have overheated & ignited.

The engine was run to fine tune the point at which the second fan kicked in, with airflow judiciously managed by Ryan armed with a large sheet of cardboard to limit throughput. Cunning! Who needs a wind tunnel or computer simulation eh?… Finally with work finished the car was all set to go; bonnet down & a 50 minute run back home to see how things went. No standing traffic encountered, so natural airflow kept the engine temperature down & the fans weren’t triggered. Despite this, the rear grills were extremely hot to touch which goes to show how much hot air there is in the engine bay. I may yet need to get some circular vents drilled into the rear bonnet face. Le Mans of course will be the big test.

All hot air

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Le Mans is less than a week away. I am excited. CBW/LM24 2017 regalia is on order and extra large door stickers requested.

Is the car good to go? Not quite… I am still waiting for the fans to arrive at SP Automotive, & have had to source the Maxi blade fuse & in line fuse holder myself. As soon as I hear the fans have arrived it’s a quick drive over to Tattenhall and what I hope is a straightforward fan swap & opening up of the rear bonnet vents.

Like I said… Le Mans is less than a week away!

Roasty toasty

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Sitting in heavy traffic on the M56 into Manchester today, no worse than on the M25 but today the weather was truly HOT. This seems to have made the difference as the coolant temperature went up to ~120 degrees which is a bit on the warm side. It cooled down towards 110 when the traffic started moving but clearly the new radiator & original Spal fan (385mm) are struggling to cope in standing traffic on a hot day.

Options under consideration are changing the fan (from a single to two [smaller] ones). removing the blanking plates on the rear ‘kidney’ shape bonnet vents and/or… drilling some holes on the rear face of the bonnet where the engine bulge drops down towards the bulkhead. The latter is a bit drastic but a possibility if the other options don’t do the trick.