Lord Gruntfuttock Posted February 25 Posted February 25 Cromwell car show has a similar cruise, loads of folks out on their driveways in deck chairs, kids with signs etc, cool to experience. There's a 4th of July run here (Merican cars) that diverts through an old folks home on the way to Te Anau. Great to see the old folk enjoying the old cars cruising through their complex... 3 Quote
HumberSS Posted March 21 Posted March 21 Hi Alex, not to challenge your obvious engineering wizardry but a couple of thoughts. Have you done a smoke test to ensure you have no leaks elsewhere?? Additionally I note that the factory exhaust exit is maybe 200mm from the outer edge of the car and quite long from my quick googling. Would it be worth emulating this (mirrored obviously) as one would assume it's good from factory given the superior engineering of Rootes group at the time! Just a thought, loving that you are starting to get some kms under your belt I bet it's a real sharn magnet! 2 Quote
yoeddynz Posted March 21 Author Posted March 21 I'd asked abut this on the imp Facebook page and many folks have had exactly the same issues with the standard exhaust. They've tried sealing up all the various wiring holes and gaps but if the hatch doesn't seal perfectly it gets in. My hatch weather seal, like most, has hardened and perished. I also found out that the throughflow vents situated on the underside of the roof at the back were deleted on the mk2 imps due to I imagine the fumes. I've sealed mine up. I'm hopefull this new system will work because the side exit on mk2.0 worked. That one just didn't have the sound I wanted. 2 Quote
HumberSS Posted March 21 Posted March 21 3 minutes ago, yoeddynz said: I'd asked abut this on the imp Facebook page and many folks have had exactly the same issues with the standard exhaust. They've tried sealing up all the various wiring holes and gaps but if the hatch doesn't seal perfectly it gets in. My hatch weather seal, like most, has hardened and perished. I also found out that the throughflow vents situated on the underside of the roof at the back were deleted on the mk2 imps due to I imagine the fumes. I've sealed mine up. I'm hopefull this new system will work because the side exit on mk2.0 worked. That one just didn't have the sound I wanted. I guess another test might be to start deploying gaffa tape along strategic seams to check if things are less than perfect? I had no doubt you'd be all over it, annoying to have to chase.. 1 Quote
yoeddynz Posted March 21 Author Posted March 21 Yeah I was planning something like that but this is an easier mod to try until I source appropriately priced seals. 1 Quote
Hyperblade Posted March 23 Posted March 23 Did some thinking last night, and my amateur thoughts on your issue... The rear of the car looks like it's perfectly designed to suck the exhaust up into the turbulent air at the rear of the engine cover, even exhausting to the sides still looks like it will be curved/dragged into that rear area. So you could try going as low as you can with the exhaust to see if you can catch air closer to the road. Alternatively some sort of out washing diffuser might work to try and get the exhaust away from the car. If your sucking fumes in to the cabin, then that could mean your cabin is lower pressure then where ever the fumes are. This could be because of holes at the front of the car, creating a flow of air from rear to front. So you could try blocking all those off as well. Additionally you could try to pressurize the cabin by force feeding air in from somewhere at the front. Basically trying to create a pressure differential to wherever the fumes are currently coming in so they naturally go elsewhere. 2 Quote
Leone Posted March 23 Posted March 23 Interestingly enough, I have a similar issue to this with the red wagon... thought a big old dump pipe putting the fumes (99% oil fumes) to the road might have been the solution... (rear door seal and corrective action on rust is probably the correct answer though) Quote
yoeddynz Posted March 24 Author Posted March 24 1 hour ago, Hyperblade said: If your sucking fumes in to the cabin, then that could mean your cabin is lower pressure then where ever the fumes are Exactly this. It's only when the windows are down though. The wind passing past the side window openings is creating low pressure inside. Fumes are never an issue with the windows up and every since I've added face level fresh air vents it's a much nicer place to be with the windows up. But then I can't hear the exhaust note plus summer days in a classic car are not the same with the windows up. I can't have an exhaust exit too low out back because itll get caught when traversing steep driveway exits etc. Shame though because it sounded even better when I ran dumpy exits straight down onto the road a few weeks ago. I think I really have to keep trying to seal the cabin up best I can. As the front of this car is so low the whole underside is a low pressure zone (which really does help extract the hot air from the radiator) I've discovered this morning that the handbrake isn't perfectly sealed. Fumes could be getting pulled along the tunnel from the air filter. Update on that soon after some more testing (ie caning it about on twisty roads 2 Quote
mjrstar Posted March 24 Posted March 24 Time for a roof scoop, they are amazing for ventilation, and pressuring the cabin. 1 Quote
yoeddynz Posted March 24 Author Posted March 24 Possibly but bloody ugly. I've just got to work out the exact source of the fumes and where they are sneaking in. Some sort of sensitive gas meter would be ideal to try and pin point the entry point/s 1 Quote
chris r Posted March 24 Posted March 24 Would it be worth attaching bits of string in various places and soing some drive by videos to see what the air is doing with windows open vs closed? 3 Quote
yoeddynz Posted March 24 Author Posted March 24 Or get one of these... https://fun-tech-lab.com/ Quote
yoeddynz Posted March 24 Author Posted March 24 Oh we at oldschool know all about hot boxing - just ask the owner of the holden panel van at coro nats.. 🥳 1 2 Quote
Alfashark Posted March 24 Posted March 24 How well sealed is your shift linkage tunnel at the cabin end? The white 110L I had would attempt to gas me with the windows down due to the lack of a shifter boot... 1 Quote
Hyperblade Posted March 24 Posted March 24 7 hours ago, yoeddynz said: Exactly this. It's only when the windows are down though. The wind passing past the side window openings is creating low pressure inside. Fumes are never an issue with the windows up and every since I've added face level fresh air vents it's a much nicer place to be with the windows up. But then I can't hear the exhaust note plus summer days in a classic car are not the same with the windows up. I can't have an exhaust exit too low out back because itll get caught when traversing steep driveway exits etc. Shame though because it sounded even better when I ran dumpy exits straight down onto the road a few weeks ago. I think I really have to keep trying to seal the cabin up best I can. As the front of this car is so low the whole underside is a low pressure zone (which really does help extract the hot air from the radiator) I've discovered this morning that the handbrake isn't perfectly sealed. Fumes could be getting pulled along the tunnel from the air filter. Update on that soon after some more testing (ie caning it about on twisty roads Bugger, shame it wasn't the other way around, then it's an easy solution! Unless you start bolting on wings, which i suspect you don't want to do to such a cool wee car. Then the only solution is the painful one of finding every hole 😕 Only other thing I can think of is when you have the windows down, open the rear windows (if possible) so it might not drag the fumes all the way to the front, but the front windows are such a large opening going to be hard to fight that. 42 minutes ago, yoeddynz said: Or get one of these... https://fun-tech-lab.com/ This has no relation to the real world, so get it as a cool toy, but don't take anything aero related from it. 1 Quote
HumberSS Posted March 24 Posted March 24 33 minutes ago, yoeddynz said: Oh we at oldschool know all about hot boxing - just ask the owner of the holden panel van at coro nats.. 🥳 In the name of science no doubt 1 Quote
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