Building a heater for Harry - Porsche 911

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[@knightime14]

'Heater' is a slang term for a gun. So now Harry has a heater, shouldn't he now be called Dirty Harry?

[@scblue01]

Howzabout a little colour coordinated extra for the cabin, a carbon monoxide detector card. The are orange when its all OK, but turn black in presence of CO. Most light aircraft have them, life saver. Cost about $10 from Flightstore.

[@alessandrog007]

I fitted electric seat warmers to my 964 ( which has amazing heat from the factory ) I now hardly ever use the heater , the seat warmers are so efficient and a hell of allot easier and simple to use . Job done

[@Datsman1971]

Freezing, in Australia... Jea right😂 Petri from Finland

[@mortofromoz1]

It does get cold here - the Australian Alps get more snow than Switzerland - but certainly not as cold as Finland. But then, what you refer to as a summer’s day is still categorised as cold here.

[@HomeBuiltByJeff]

Not Finland cold but it was -3c, so cold for us ;)

[@billweston6579]

It may have benefited with a 1/2 baffle between it inlet and out let to push the air around the exhaust pipe.

[@vmoney9106]

Yes but next time you complain it’s hot, it’s probably not Australia hot .

[@Steve-jq4st]

The southern and northern highlands of NSW can get quite cold. Minus 11c in Armidale when I lived there on occasion. A lot of Europeans are surprised at the cold sometimes. Finally I love Finland having worked at the University of Helsinki on two occasions.

[@PaulSullivan-ku7qt]

You have electric air conditioning so you could use a 3 way valve and make reverse cycle air conditioning. Please let me know what you think. I am industrial AC trained

[@HomeBuiltByJeff]

Classic Retrofit who made the A/C system is trialling a heating system at the moment but it is not done.

[@janwall2648]

I agree with paul Sullivan, most electric cars invert the function of the AC and call it heat pump ( correct name as well!) so doing that with what you got must be the right way to go!

[@PetesWorkshop]

This is a brilliant idea.

[@jamest5149]

If this isn’t sufficient, you could try and fabricate a 3 pass system inside, 3 strips making the air run from the inlet along the exhaust manifold, reverse back, then reverse again so the flow the exits as you have it. Also a Tesla style heat pump used for aircon can produce heat same as your home AC 👍

[@Originalfarmerlip]

Stuff the exchanger with some steel mesh, more hot material for the air to hit.

[@jordankokolis]

Am i mistaken or didn't you buy the Merc exactly for this reason?

[@fraserwright9482]

I fitted an Eberspacher airtronic, it's a petrol preheater. This was an option on Nordic cars. Now they have an app on your phone and temp sensors. You just wire it in and off you go. You can run it independently of the engine, it uses less than a litre of fuel

[@MrCaprinut]

My late father had petrol heater in his T3 Transporter. Those work wonders. It could be sauna hot if you want to. I guess it was fitted when new as it was sold new here in Norway.

[@ro63rto]

😂 10°c to 17°c is "freezing" ? Try coming to England 😊 Jokes aside, if you find the heat isnt enough, try welding some fins along the exhaust that runs inside your heat exchanger. That will uncrease the surface area and hopefully increase the heat output.

[@MrMightyytau]

Try -2 c of a morning

[@1one3_Racing]

10 isn't freezing. Jeff is a sook. It probably gets to -5 where he is. I was down that way in winter 3 years ago and every morning was melting the ice off the windscreen.

[@anomamos9095]

Tip Loosely pack some stainless steel scowering pads in the heat exchangers to give more surface area.

[@ChrisNF]

It does get cold in Australia, the Perth houses aren’t built particularly well and barely insulated. My house always feels refrigerated 🥶

[@knightime14]

'Heater' is a slang term for a gun. So now Harry has a heater, shouldn't he now be called Dirty Harry?

[@gazzafloss]

Jeff, Harry is definitely a North Queensland car, air conditioner works, doesn't need a heater, you can always send him up to my place to live. I'd let you visit, honest...

[@ceesklumper]

I suggest putting exhaust wrap (you see people put on motorcycle exhausts) around the heat exchangers to transfer more heat to the air going through the exchangers.

[@lanceboyle4255]

VW Beetles in Canada all used to have petrol fired heaters ignited by a spark plug

[@1one3_Racing]

Wait, what? Its not Sunday 11.30pm...

[@Pats-Shed]

Paul Sullivan beat me to the comment about using a reversing valve on the electric A/C system in Harry . The other alternative is to use a water-cooled exhaust as used in jet skis , with an electric charge cooler pump or Prius MK1 inverter coolant pump and piped to a heater core. Temperature control could be achieved by modulation of the pump speed .

[@watersmart1]

Hey Jeff I used to drive a Volkswagen beetle in the winter time and the way I did the heat in my car is using a exterior oil cooler running the lines into the back of the car with a little squirrel fan to blow through the oil cooler then cracking the vent window open. I could have defrost and warm a cabin temperature. In the summer I would disconnect the system or run the system on the outside.👍❤️🇨🇦

[@WillemFick]

In Jeff's case, he has a front mounted oil cooler, so very easy to fit an additional oil cooler with bypass valve in the trunk to supply hot air to the cabin.

[@watersmart1]

@@WillemFick nice, sounds easier than my adaptation

[@ericmorriscompany9648]

We’ll, that’s a good excuse to constantly be heavy on the throttle in the winter. “But officer, my fingers were cold!” 😂😂😂

[@lwhois31]

Heat wrap to collect all the heats

[@stephengaffney2068]

I’ve been wondering how you got on with fixing the roof on the alfa after the mishap with the ramp

[@truthseeker8483]

I know what would fix the heater and the exhaust.....a standard 911 exhaust....🙂

[@HomeBuiltByJeff]

I had one, but it is super restrictive on this engine.

[@Sharkerp38]

I had a crack in the heat exchanger in my 964 turbo, so raw exhaust would end up into the cabin. While waiting to fix it, I was just not using any heat in October in Canada. I feel your pain, I was SO frikking cold on that drive.

[@benjamin4827]

Howzit Jeff, Some fibre exhaust band around the heat exchange tubes, may help? Also, throttle the air inlet, fast air flow has no dwell time to heat up. Greetings from Johannesburg, South Africa 👋🏿 Home of the 2023 William Webb-Ellis Cup 😊

[@markwalton8644]

Hi Jeff. Shame you couldn't draw hot air from the Manifold. Perhaps some Heat lagging from the Manifold back and around the Heat Exchanger might help retain the heat and into the exhaust to the HE. Another idea would be to reverse the AirCon so it becomes a Heat Source Pump🤔

[@peterpanx1]

Interesting! I always wondered how those exhaust heaters work, particularly in VW Bug and in the Porsche's. And how you should go about building one yourself. I guesstimated the length of your system would be plenty enough to heat the car. But on a cold day I suppose the cold wind also cools the exhaust system. Perhaps if you wrap your heater in some exhaust insulation material. That might increase the efficiency. Great video! 🙂

[@yamnut1]

Hi Jeff, wow! More fantastic fabricating skills, hope this Finally does fix the heating 👍

[@derekwhittle1885]

Do you think a CO alarm in the cockpit would be wise? I would worry about small exhaust leaks.

[@joshevans4529]

Jeff could you wrap the heat exchanger so it doesn't lose so much heat externally?

[@fcknhellmate]

But why not go electric heater? Wouldn't that be simpler since car already have beefier alternator to support A/C.

[@jerondickerson9679]

I wonder if insulating the heat exchangers with exhaust wrap would make them more efficient?

[@rmcsilva]

Adding some baffling inside the exchangers wouldn't help extract more heat from the exhaust? Same as with the radiators, if it stays longer it's able to exchange more energy.

[@alastairwatson3201]

Always good to have a bit of Harry content from time to time.

[@johngriffin9547]

I’m wondering if you’d pick up a little more heat if you have welded on a bunch of little fins to the exhaust. Surface area and all that.

[@briannareid9423]

No misses Jeff that’s a tax I look forward to her info

[@Aviopic]

With insulation in the heat exchanger you would have a lot more efficiency I guess 🤔

[@jimgerock9190]

How will you now remove the valve covers with those in the way? Could be difficult to adjust the valves.

[@arni780pl]

some paralel metal stripes welded to exhaust pipe before closing covers surely would increase heat exchange area

[@mikeyg4297]

T7 design electric heaters best way forward!!

[@cencio_1976]

I’m always amazed how you manage to keep all of your fingers.

[@johngibson3837]

Hey up jeff you can buy heated clothing these days, hot water bottles have been a thing for years, convert harry into a steam engine so many options mate, i think the cold has gone to your head and caused madness, couldn't you just go to work for a warm

[@Pebsi07]

Maybe a couple of baffles in the heat exchangers to slow the flow down that is close proximity to the the exhaust if you find you want a bit more temp?

[@andreasschilpp2358]

A decisive question is how much does the temperature drops with the heat exchanger or in other words if there is enough energy to heat up the car. If there is enough heat energy you could improve the heat transfer inside the exchanger by adding steel wool and thus getting turbulent air flow and a larger surface area which increases heat transfer to the air…. It is physics again ❤

[@dubsydubs5234]

You needed to cover the header, the bit you're getting heat from is only hot when you get on the throttle. The original heaters have cast aluminium fins cast around the pipes then they get boxed in and they're still pretty crap.

[@philliplopez8745]

Buy a $100.00 Chinese diesel heater and mount it in the frunck .

[@jnc07res]

You mean after all that you couldn't even film yourself enjoying a drive up to get some coffee?

[@123shaunstodd]

Are you going to weld fins onto the exhausts to increase surface area, this is what I'd in the oem heat exchangers?

[@FanatikBuilds]

I do chuckle at -3 being cold, but in all fairness, I have heat in my car! … pretty sure if it was a sustained -3 in the cabin I’d be feeling a bit chilly too! 😉 nice one Jeff, great to be able to add in a feature like that without much expense! 👌✌️

[@HomeBuiltByJeff]

We definitely don't have Canada cold here, but it is still chilly in a draughty cabin with no heater and not even an engine in front of you to radiate heat ;). This now works when cruising to keep the sting off the cold and when I get on it, it is down' right toasty :D

[@FanatikBuilds]

@@HomeBuiltByJeff Absolutely! Happy it worked out for you my friend, nice to have the headers *and* heat! 🥳

[@hanshenrikkristiansen7890]

Building a heater 😂😂 here in Denmark we have 31 degrees Celsius 😅😅

[@glennarnold3970]

hi jeff another way you could get heat is use a 6 inch oil cooler from the engine and put it in a small box with an inlet and outlet pipes in it and use the oil cooler as heat instead of exhaust but heat is heat when it gets cold cheers glenn

[@benstrait333]

Yes! This is what I was thinking as well.

[@HomeBuiltByJeff]

Oil takes a long time to warm up. Much longer than coolant. Exhaust is super quick ;)

[@glennarnold3970]

@@HomeBuiltByJeff when do you think the alpha will be engineered i get my e90 turbo barra looked at in about 3 weeks either here in the hill or travel 850km your way cheers glenn

[@plus790]

Exhaust wrap your fabricated exchangers.

[@chrisoo8998]

Disel heater😂 may sound stupid but it would work

[@AMLagonda]

Um, was this done before you bought the Merc as a daily?

[@OriginalNotNyanCat]

Why not use oil coolers like radiators in a front engine car for generating a heat source, instead of exhaust heat tubes?

[@HenryGruszniewski]

They make electric heaters the size of a big shoebox. Lot less work

[@treecrusher]

Sorry officer, I had to give it to it so the heater would work😅

[@bobgcampbell]

Did your O2 sensors survive the welding?

[@ANDY5]

If you are looking to improve the efficiancy, other than lagging, the best way is to try and increase the residence time in the HX's. It might be worth a try to block off the fan delivery from one side. Pass the air through one HX and then plumb that heated air into the other HX and then send that air into a "Y" piece and into your ducting from there, a double pass essentislly.

[@ideabrickworks9043]

With your large alternator, what if you added a couple in line electric resistance heaters. Again, it would not be a lot, but coupled with the exchanger. Heat pumps are getting better. I need to see if they are used in EVs.

[@ideabrickworks9043]

My daily driver while in college was a 72 914, so I know all about heat exchangers. My car was outside, as my parents were in the garage. I did add an oil heater to help start the old FI of the day. Still, it was brutal in Iowa winters. Ironically, it was a good snow car, I mostly just drove over the snow with the smooth bottom. Stopping was always exciting.

[@HomeBuiltByJeff]

It is also a matter of plumbing it in somehow. The factory plumbing is still there so it is just easier to use it :D

[@1one3_Racing]

It's in the maths. A typical fan heater from Kmart is 2400w. That's 240v at 10 amp. A large alternator is 80amp at 12v, which is only 840w. Using ALL the alternator. If you want to run a stereo that's 10amp at full volume. Lights are another 10. Realistically you can maybe draw 50amp from a large alternator without effecting anything. That's only 600w or so. So a fan heater on low. It'll heat the car, but not well. Plus it's constantly being buffeted with cold air and has the thermal properties of crepe paper. You could run a 2000w inverter but they don't like huge current draw on big duty cycles. You'll burn out inverters or heaters constantly. I used to drive old trucks with rusted out heater cores and tried a myriad of electric alternatives with zero long term success.

[@NomadBaker]

Why put in something electric thats complex and a point of failure, when you can put in a simple passive heatexchanger that is factory?

[@PaddyMcGintee]

Lean out the fuel temporarily for hotter headers?

[@badkron]

I can see why my beetle friends run electric heaters.

[@harryfahrtdenwagenvor5202]

I like Harry. Don't know why 😅

[@SpankysHotRodsandCustoms]

Awesome, I may have to do this on my 911. Thanks Jeff

[@TR4Ajim]

Jeff, I’m the last guy who should be talking Health & Safety (considering my lack of when working on my car), but please wear gloves when using your cutting wheel!😬 It only takes a second to do serious damage to your hand.👍

[@lindamiskin4522]

Actually if you google that wearing gloves when using an angle grinder it is not recommended due to the entanglement risk

[@jimgerock9190]

I know you have the headers- but my recommendation is the SSI brand stainless steel heat exchangers paired with a Dansk S/S muffler. Nice sound with heat.

[@HomeBuiltByJeff]

They are too small for my engine to breath properly.

[@corty1980]

Home built by Jeff, I thought it was required to get a roadworthy that you have a demister, how does the Porsche accomplish this. Looking at doing something similar on my current project, but don't want to run the ugly heater box with radiator core in my engine bay. I got an electric heater but that is useless. This idea of the heat exchanger might be a solution.

[@HomeBuiltByJeff]

I has the A/C to demist (and back when it first got registered it had a standard exhaust).

[@mariozanze]

Hey Jeff, Noticed one of the bolts on the outer CV joint hanging out. (driver's side)

[@mariozanze]

Could be inner, also a split in the CV boot.

[@glensgraphix]

Curious to know how you got the car registered without heating? I don't know the rules that are required in NSW but just about everywhere else the car is required to have a heated windscreen. How does it work there?

[@HomeBuiltByJeff]

It had a stock exhaust when I first registered it.

[@Pebsi07]

Quality work

[@LarsAnders54]

I thought you were using the Mercedes as your daily? Why mess with Harry?

[@HomeBuiltByJeff]

I is still nice to drive a fun car in Winter too ;)

[@jadamsnz]

"Hello officer. Why was I speeding? I was cold..."

[@supercarowners]

My next tshirt slogan is "Something is better than absolutely freezing - down under"!!

[@rjnerd]

Your car has a liquid coolant, the oil. Add an auxiliary oil cooler in a small box, and connect to the vent pipes. Also a tip from the EV crowd, heating people directly takes a lot less energy than heating the cabin. Add electric seat and steering wheel heaters.

[@mawe42]

Jeff, been there, done that (exactly that), doesn't work. Just get a set of stock heat exchangers ir a petrol heater. Edit: maybe it works better for you if its dry in the winter where you are. Here its often wet and nd that cools the exhaust a lot.

[@timwhalan6417]

🍺👍🏻👏

[@johndivitto4327]

A bit late for this suggestion, but adding some studs (or fins) to the exhaust pipe would significantly increases heat transfer. We do this to an extreme in the power industry, but any extended surface on such a short section would help.

[@watsonwatson8051]

Nice job, could add some baffles to give more time for heat transfer. I like Harry

[@billmcintosh1242]

Good work, nobody wants a cold Harry! Thanks! Bill Mc

[@ChRacingTeam]

How about some exhaust wrap around the heat exchangers to insulate and limit the wind cooling it down the hot air?

[@LeeNortcliffe]

I would suggest (if you re-build) welding fins on to your exhaust to give a larger surface area for the air to be heated by

[@Papa-Bogey]

Subscribed, liked, commented!

[@HomeBuiltByJeff]

Thanks mate :D

[@matty74123]

I had a Dansk stainless system on my old 911 the headers had the heater boxes built in

[@justwhy2484]

I guess that the failure to put in a radiator could be considered a design fail.

[@n-tmgarage]

The joy of winter ❄️ in the Southern Highlands.

[@JonathanAdams-z8r]

That’s a nice bit of fabrication Jeff! Well done!

[@terryhand]

In the UK we have this naive idea that the sun is shining everyday in Australia!

[@marklr5716]

13:10 hoses match the car colour.. its a "feature" ;)

[@Michie1391]

What i like most about this car, is that its used like it should be

[@jimclarke1108]

Top the radiator up)))😁

[@peterbonnez]

Excellent job..

[@jeppenordfosskristensen7319]

Top job 👌🏻🏁👍🏻

[@tonyparadiso8046]

i assume you know you have a split cv boot

[@Joxaco]

And a loose CV joint bolt..

[@HomeBuiltByJeff]

Yep

[@HomeBuiltByJeff]

I missed the bolt. Thanks.

[@Joxaco]

@@HomeBuiltByJeff I just dropped my drive shaft from gearbox flange on SC couple of weeks ago... For a moment I was wondering why I lost the drive and how costly it will be :) Luckily only one bolt was snapped, I did replace them all after that.

[@Torch4ya]

Looks great! How about some header wrap around the heat exchangers to keep the heat in a little?

[@davidklauer3422]

Like the mid week updates