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wozza
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Hanaldo (01/03/2014)
I would be interested where you get the 99% from I have done quite a bit of catch tank testing on race engines over the years and the exhaust/filter in the picture works well at separating the oil droplets from the air and retaining it within the tank. You have to be careful with baffles, fit them in the wrong place and you can build up quite a bit of back pressure within the tank restricting the air flow and therefor defeating the object really. Warren Is there a filter in the can? If so, it's not an empty system and will be doing more than the simple in-out empty cans. Out of interest,is the car this is going on street driven? I agree that care needs to be taken with baffle placement, which is why functioning oil air separators need to be properly designed. Volume, baffles and flow. The idea is to slow the air down enough to allow the oil and water vapours to condense and separate from the air. An empty tank will not slow the air enough to allow this to happen. Obviously the air flow should not be slowed so much as to become a restriction, hence why volume is important. Trying to achieve flow and high vapour separation in a tank under 2L in volume is always going to be difficult. Don't take my comments the wrong way, I don't mean to bad mouth your product. Obviously this all needs to be balanced with the customers needs, and if the car is street driven then it will always be a compromise as no recirculating catch can setup will be 100% efficient. Not offended hence the smiley face in my reply. As I see it when you post on a public forum you have to accept comments both good and bad  This particular tank is going on a Formula Student car being built by a university I have been helping. So no street use and only short run times. The tank is required as part of the regulations, all cars must have a catch tank capable of holding a minimum of 0.92L. Warren
Carbon Copies Ltd
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Hanaldo
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I would be interested where you get the 99% from I have done quite a bit of catch tank testing on race engines over the years and the exhaust/filter in the picture works well at separating the oil droplets from the air and retaining it within the tank. You have to be careful with baffles, fit them in the wrong place and you can build up quite a bit of back pressure within the tank restricting the air flow and therefor defeating the object really. Warren Is there a filter in the can? If so, it's not an empty system and will be doing more than the simple in-out empty cans. Out of interest,is the car this is going on street driven? I agree that care needs to be taken with baffle placement, which is why functioning oil air separators need to be properly designed. Volume, baffles and flow. The idea is to slow the air down enough to allow the oil and water vapours to condense and separate from the air. An empty tank will not slow the air enough to allow this to happen. Obviously the air flow should not be slowed so much as to become a restriction, hence why volume is important. Trying to achieve flow and high vapour separation in a tank under 2L in volume is always going to be difficult. Don't take my comments the wrong way, I don't mean to bad mouth your product. Obviously this all needs to be balanced with the customers needs, and if the car is street driven then it will always be a compromise as no recirculating catch can setup will be 100% efficient.
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wozza
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Warren (Staff) (28/02/2014)
Just a minor thing... is there going to be a sump return or drain tap??Hi Warren, customer undecided re sump return at the moment. In the interest of weight saving the tank can be drained (well most of it) by releasing the top push in connector on the level tube, they are swivel connectors so it can rotated 180 and drained that way Warren
Carbon Copies Ltd
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Warren (Staff)
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Just a minor thing... is there going to be a sump return or drain tap??
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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wozza
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Hanaldo (28/02/2014)
I cant imagine it being a major problem in the short term though as a catch can shouldnt be getting much oil through it anyway on a properly tuned engine with well managed crank case breather/ventilation system. Depends on the engine setup really. My car sees a bit of blow-by on track duty, but that's on a built motor running a lot of boost and on ethanol. But to be honest, without baffles inside the can, 99% of the oil vapours will blow straight through it anyway. I'd keep an eye on it, but I agree it's probably nothing to be concerned about. I would be interested where you get the 99% from I have done quite a bit of catch tank testing on race engines over the years and the exhaust/filter in the picture works well at separating the oil droplets from the air and retaining it within the tank. You have to be careful with baffles, fit them in the wrong place and you can build up quite a bit of back pressure within the tank restricting the air flow and therefor defeating the object really. Warren
Carbon Copies Ltd
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Hanaldo
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I cant imagine it being a major problem in the short term though as a catch can shouldnt be getting much oil through it anyway on a properly tuned engine with well managed crank case breather/ventilation system. Depends on the engine setup really. My car sees a bit of blow-by on track duty, but that's on a built motor running a lot of boost and on ethanol. But to be honest, without baffles inside the can, 99% of the oil vapours will blow straight through it anyway. I'd keep an eye on it, but I agree it's probably nothing to be concerned about.
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wozza
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matthieutje65 (27/02/2014)
Looks great! Did you use a gelcoat? I kind of see a blue-ish misty layer? or is it just the camera-flash?Hi Matthieu, bit of both I think I used GC50. With the mould being quite deep and narrow I may of laid it down a bit heavy with the gelcoat gun. I use GC50 often not just for UV protection but mainly in this case to act like spray tack to hold the first layer of cloth in place. Warren
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Warren (Staff)
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Looking great as always!
You wont have any problems with the oil itself as long as its got a good sealing layer of epoxy inside. However, as oils age you often get combustion products contaminating the oils and they can slowly eat into epoxies. Vinylester resins seem to have a better chemical resistance than epoxies so you might want to coat the inside of your can with that to give you extra protection.
I cant imagine it being a major problem in the short term though as a catch can shouldnt be getting much oil through it anyway on a properly tuned engine with well managed crank case breather/ventilation system.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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Matthieu Libeert
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wozza
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Brian2fast (27/02/2014)
Hi Warren That looks cracking! Do you have to coat the inside with some oil resistant layer or is carbon ok for that? Could you do the same for an oil tank? Are those threaded inserts Alu? Did you change your mind half way thru about bonding two halves together? Craig Hi Craig, the plan is to offer two capacities. 1L and 2L, so either half or full cylinder if that makes sense. Not had any issues with oil attacking the epoxy with the test samples I did, but to ensure a perfect leak free seal once the back had been bonded on I mixed up some resin with a little black pigment in, poured it through one of the holes and then rotated the tank to cover the inside surface. Yes the threaded insets are ally, drilled and tapped 1/8 and 1/4 BSPP and then bonded on with ET515. I can't see why it wouldn't work for an oil tank. Warren
Carbon Copies Ltd
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