Tiger Tamer Posted October 2 Share Posted October 2 I have just been away in our Sunbeam Tiger for a few days and did approx 1500k. Mainly the car ran well but at times it could have been better. I am pretty sure it is heat related as the car has a small engine bay which is fairly cramped with the sbf engine. After running for a while and then parking up for a short period it starts and runs fine but if you stop for 30min or an hour it will run quite badly until it clears itself. I think being a small engine bay that the engine heat must be boiling the fuel in the fuel lines as it is fuel injected and has no float bowls. I did open the bonnet a few inches at a lunch stop to let the heat out and it ran fine when restarted. The engine is running a bit hotter than I would like and it does have a good-sized electric fan as well as a flexi fan which I am going to replace. I think the ign timing needs adjusting as well. My plan is to heat sleeve the fuel lines adjust timing and replace the flexi fan which I don't think moves that much air. I will also remove the headers and check them for any leaks as they can cause problems with the exhaust censor readings. I will get the headers coated so I am wondering where is the best place to get them coated. I have used HPC before but there seems to be others as well now. Any advice appreciated. Quote Link to comment Share on other sites More sharing options...
RXFORD Posted October 2 Share Posted October 2 ProCoat arr local to me in East Tamaki, but hes really difficult to deal with and never delivers in the timeframe he says. HPC in Manurewa are worth the money in my opinion. Nicholai is a good sort and always helpful. I'm not sure about any others sorry. 1 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted October 5 Share Posted October 5 I've never had headers coated, but HPC did some pistons for me once. They were fucking brilliant to deal with. Elite powder coatings in CHCH do header coatings too. They do a shiney chrome looking one, and a black one that can withstand higher Temps. 1 Quote Link to comment Share on other sites More sharing options...
Tiger Tamer Posted October 5 Author Share Posted October 5 19 minutes ago, RUNAMUCK said: I've never had headers coated, but HPC did some pistons for me once. They were fucking brilliant to deal with. Elite powder coatings in CHCH do header coatings too. They do a shiney chrome looking one, and a black one that can withstand higher Temps. On 03/10/2024 at 01:09, RXFORD said: ProCoat arr local to me in East Tamaki, but hes really difficult to deal with and never delivers in the timeframe he says. HPC in Manurewa are worth the money in my opinion. Nicholai is a good sort and always helpful. I'm not sure about any others sorry. I will use HPC as I have used them before and found them good to deal with. That was a long time ago now so I thought I would ask, incase things had changed. I want to stop the heat sink once the engine is turned off so i think a coating on the headers will help and make them last longer. I will see if i can make some heatshields to help reflect the heat down as well. First, I will start with ign timing and fitting a Deral fan I have somewhere. I can run the ign timing through the ecu as well but I need to pull the msd dizzy apart and stop the mechanical advance to do so. Quote Link to comment Share on other sites More sharing options...
RXFORD Posted October 5 Share Posted October 5 It was a while ago since I got the last set done, so my memory might not be too accurate, bit I vaguely remember Nicholai saying the Hipercoat can reduce temps outside of the headers by up to 60% or something along those lines. It definitely helped our application and stopped the paint discolouring from the heat. Quote Link to comment Share on other sites More sharing options...
Tiger Tamer Posted October 5 Author Share Posted October 5 6 minutes ago, RXFORD said: It was a while ago since I got the last set done, so my memory might not be too accurate, bit I vaguely remember Nicholai saying the Hipercoat can reduce temps outside of the headers by up to 60% or something along those lines. It definitely helped our application and stopped the paint discolouring from the heat. I will ask them about Hipercoat. I was looking on their web site a few days ago and it may be an external coating only. It would be nice to have the internal coated as well to make the headers last. The engine is a later 5.0L with GT40P heads so I had to build my own headers at the time, so I can't buy another set if these rust out. Quote Link to comment Share on other sites More sharing options...
rusty360 Posted October 5 Share Posted October 5 Just a tip what ever you go with try not to get a polished one. I got a exhaust manifold HPC coated and they must vibration polish it to shine it up. Everywhere there was a sharp edge it went rusty bloody quick. Or attack all sharp edges first, radius them off. 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted October 5 Share Posted October 5 I cant tell from your pics, but the most likely source of fuel problems will be conductive heat (metal fuel rail bolted directly to engine, transferring heat into fuel) If there's a way to mount some plastic washers to isolate your fuel rails from touching the motor. This will likely make the biggest difference if fuel temp is your issue. Is this car running a fuel surge tank? Generally EFI systems are less susceptible to fuel boiling as the pressure is so much higher. 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted October 5 Share Posted October 5 Coating headers probably won't help much, if at all. Those headers look like they weigh like 2 kg each - they won't store anywhere near as much heat as your 250 kg engine block and heads. What does the ECU reckon? It could just be a poor tune at those conditions 1 Quote Link to comment Share on other sites More sharing options...
Tiger Tamer Posted October 5 Author Share Posted October 5 10 hours ago, Roman said: I cant tell from your pics, but the most likely source of fuel problems will be conductive heat (metal fuel rail bolted directly to engine, transferring heat into fuel) If there's a way to mount some plastic washers to isolate your fuel rails from touching the motor. This will likely make the biggest difference if fuel temp is your issue. Is this car running a fuel surge tank? Generally EFI systems are less susceptible to fuel boiling as the pressure is so much higher. The fuel rail isn't bolted to the engine but is up where all the hot air is trapped. I know it seems strange being efi. I don't run a surge tank as such. The car has twin tanks one in each of the rear guards so I half blocked off the cross over tube at both ends. Being a slight V shape that traps fuel in there and stops the outlet from ever being left dry if the tanks get low. Pic attached. Quote Link to comment Share on other sites More sharing options...
Tiger Tamer Posted October 5 Author Share Posted October 5 1 hour ago, ajg193 said: Coating headers probably won't help much, if at all. Those headers look like they weigh like 2 kg each - they won't store anywhere near as much heat as your 250 kg engine block and heads. What does the ECU reckon? It could just be a poor tune at those conditions Yes i should connect up the ECU controller and see what it says. Something I haven't done. Two reasons for the header coating as I want to protect them as well. Otherwise I will have to make another set one day. Quote Link to comment Share on other sites More sharing options...
mjrstar Posted October 5 Share Posted October 5 I've got the hpc hyper extreme on my Mazda, it definitely makes a difference. The coating is black on the outside and silver on the inside, so I'd expect it to provide some corrosion resistance internally. The coating is maybe 10+ years old, but as is the way with my projects sometimes once I get them running and driving I move onto the next one. So the coating hasn't had a workout or hundreds of heat cycles. 2 Quote Link to comment Share on other sites More sharing options...
cletus Posted October 6 Share Posted October 6 On the turbo setup in my VG I had the hot side piping done in the extreme stuff, they do a ceramic coat (the white/silver ) then go over that with the black, that was pretty good On my current vehicle I just had them coated in the black, but I think it's either a bit thin or not up to the heat of a turbo setup as some of it has gone rusty in places 1 Quote Link to comment Share on other sites More sharing options...
JustHarry Posted October 6 Share Posted October 6 Is your bonnet louvered? Could be worth putting a few rows in to let the heat out. This is a customer's one I did the hardtop on. 4 Quote Link to comment Share on other sites More sharing options...
Tiger Tamer Posted October 7 Author Share Posted October 7 3 hours ago, JustHarry said: Is your bonnet louvered? Could be worth putting a few rows in to let the heat out. This is a customer's one I did the hardtop on. I know that car and the owner. Louvers are a good way to let the heat out. We put some vents in when we did the restoration buy it doesn't seem to be enough. Another trick is to have another bonnet catch that holds the rear of the bonnet open a bit like in my photo which helps air flow through. Tigers are notorious for getting hot in slow traffic situations. 3 Quote Link to comment Share on other sites More sharing options...
JustHarry Posted October 8 Share Posted October 8 On 07/10/2024 at 16:13, Tiger Tamer said: I know that car and the owner Small world. Craig was in today haha 1 Quote Link to comment Share on other sites More sharing options...
Tiger Tamer Posted October 8 Author Share Posted October 8 13 minutes ago, JustHarry said: Small world. Craig was in today haha Craig has a few interesting cars apart from the Tiger that are just as cool. Quote Link to comment Share on other sites More sharing options...
JustHarry Posted October 8 Share Posted October 8 1 hour ago, Tiger Tamer said: Craig has a few interesting cars apart from the Tiger that are just as cool. Yeah I did the panel work and assembly and some paint on the mid 30s Riley. And have done patches of work on both avenger race cars and the sunbeam talbot I actually sort of work for Craig. The family owns part of the firm I work for 2 Quote Link to comment Share on other sites More sharing options...
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