Torques Posted November 8, 2012 Share Posted November 8, 2012 Just wondering if an oil catch tank would allow me to run more timing? (Oil content / vapor supposedly increases detonation likelihood .. ?) Does this depend on the engine's blowby / wear/tear or does it help in any case? Thanks .. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/ Share on other sites More sharing options...
89CAL Posted November 8, 2012 Share Posted November 8, 2012 what? timing affects combustion of the engine, it has nothing to do with the blowby or lubrication system This theory is a bit odd to me Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616373 Share on other sites More sharing options...
GTRsean Posted November 8, 2012 Share Posted November 8, 2012 Well oil/oil mist in the combustion cylcle is an octane reducer, so knock is more likely to happen... Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616379 Share on other sites More sharing options...
brenton21 Posted November 8, 2012 Share Posted November 8, 2012 As in the engine taking in oil from the breathers? That would have to lower the octane of the fuel, If enough oily mist was able to get in Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616386 Share on other sites More sharing options...
Torques Posted November 8, 2012 Author Share Posted November 8, 2012 Yes, that was exactly my point/question. Oil vapour reduces octane rating .. so I thought the catch tank might help. Well oil/oil mist in the comustion cylcle is an octane reducer, so knock is more likely to happen... Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616396 Share on other sites More sharing options...
Torques Posted November 8, 2012 Author Share Posted November 8, 2012 (edited) Sorry for not making this clearer, please see below/above posts.. Cheers! what? timing affects combustion of the engine, it has nothing to do with the blowby or lubrication system This theory is a bit odd to me Edited November 8, 2012 by Torques Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616399 Share on other sites More sharing options...
R31Nismoid Posted November 8, 2012 Share Posted November 8, 2012 You'd need to be breathing a fair bit to have a major impact in that regard when talking your average street level application. At street performance level best you'd be talking a degree/two of timing which you'll never notice really and any tune should be safe enough to accommodate that anyway Catch can (proper one with baffles) is always a good idea regardless Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616498 Share on other sites More sharing options...
GTSBoy Posted November 8, 2012 Share Posted November 8, 2012 Assuming the car was tuned with a certain amount of blowby, and assuming that that amount of blowby oil was enough to require a little timing to be (notionally) taken out to prevent it pinging, and assuming that the catch tank will sufficiently reduce the oil return to the charge.......then yes, you might be able to add a degree. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616507 Share on other sites More sharing options...
Torques Posted November 8, 2012 Author Share Posted November 8, 2012 (edited) Thanks, So one degree or two is definitely not worth the effort then, especially since my engine is quite healthy. If we were talking five degrees or more it would have been a different storry, How much oil do you guys find in the catchtank anyhow? It's not vast amounts, is it? You'd need to be breathing a fair bit to have a major impact in that regard when talking your average street level application. At street performance level best you'd be talking a degree/two of timing which you'll never notice really and any tune should be safe enough to accommodate that anyway Catch can (proper one with baffles) is always a good idea regardless Edited November 8, 2012 by Torques Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616669 Share on other sites More sharing options...
Torques Posted November 8, 2012 Author Share Posted November 8, 2012 Alright, I think I got the point Assuming the car was tuned with a certain amount of blowby, and assuming that that amount of blowby oil was enough to require a little timing to be (notionally) taken out to prevent it pinging, and assuming that the catch tank will sufficiently reduce the oil return to the charge.......then yes, you might be able to add a degree. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616672 Share on other sites More sharing options...
Hadouken Posted November 8, 2012 Share Posted November 8, 2012 I find nothing in mine because it runs back into the rocker cover Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616688 Share on other sites More sharing options...
DVS JEZ Posted November 8, 2012 Share Posted November 8, 2012 Rather than putting the extra degree ir two in u should look at it as theres an extra degree ir two of safety Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616726 Share on other sites More sharing options...
battery Posted November 8, 2012 Share Posted November 8, 2012 On e85 mines fills up with water Lololol took out 400ml after 1000kms Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616734 Share on other sites More sharing options...
DVS JEZ Posted November 8, 2012 Share Posted November 8, 2012 On e85 mines fills up with water Lololol took out 400ml after 1000kms Haha yeah same same Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616740 Share on other sites More sharing options...
HYPED6 Posted November 8, 2012 Share Posted November 8, 2012 What if......... Say I said........ I have seen a turbo V8 that after cleaning the inter cooler piping from all oil residue (due to poor crank case ventilation) and cleaning carbon deposits of the tops of pistons we where able to dial in 10 degrees more timing............... Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616915 Share on other sites More sharing options...
GTSBoy Posted November 8, 2012 Share Posted November 8, 2012 I would say the carbon deposits were more likely to be the cause of that. The oil won't help, and just maybe if there was shit tons of oil mist going round it might have cost some timing. But I'd point to the carbon first. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6616925 Share on other sites More sharing options...
HYPED6 Posted November 8, 2012 Share Posted November 8, 2012 Where does the carbon come from? Just the fuel? Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6617057 Share on other sites More sharing options...
GTSBoy Posted November 8, 2012 Share Posted November 8, 2012 Fuel and oil. For sure, the oil is contributing to that problem, but there are other ways to deal with that. Run E85 or some WMI and you'd have a squeaky clean upper engine. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6617068 Share on other sites More sharing options...
HYPED6 Posted November 8, 2012 Share Posted November 8, 2012 Unless your running 98 and don't want water methanol. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6617089 Share on other sites More sharing options...
GTSBoy Posted November 9, 2012 Share Posted November 9, 2012 I think if you're building an engine to make as much power as is needed to start worrying about oil vapour separation and the potential consequences of not separating it, you'd almost be negligent to not be seriously thinking about either E85 or WMI. They both equal pretty much free power. So once you get past the point of running stock injectors and turbos and all that jazz, and start having to buy new bigger stuff, you'd be much better off designing your system around one of those options anyway. That's just my 2c, marginally related to the original topic as it is. The point is, the effect of oil mist would be greatly reduced by running E85 or WMI, as you wouldn't get anywhere near as much carbon. Your test would have been better (scientifically) if you'd left the carbon behind when you cleaned out the oil and tested how much extra timing you might have gotten just from reduced oil. Then cleaned out the carbon and gone back again. More cost and trouble obviously, but that's the usual problem when you alter 2 variables at the same time. It's hard to tell which one was responsible for the change. Link to comment https://www.sau.com.au/forums/topic/413321-does-an-oil-catch-tank-more-timing/#findComment-6617103 Share on other sites More sharing options...
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