QWKcans - Catch Cans for your Supercharged Lotus - LotusTalk - The Lotus Cars Community
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post #1 of 61 (permalink) Old 02-25-2010, 11:03 AM Thread Starter
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QWKcans - Catch Cans for your Supercharged Lotus

Our Sector111 catch cans have arrived! We are quite excited about this new innovative design from Secant Vehicles. Oil blow by is a problem that any supercharged car needs to address. Our QWKcans makes capturing & draining this oil quick & easy. The quality of our kit is superb. Our QWKcans feature an innovative mounting system that is secured to the engine so it moves with it. No drilling required - easy install.

Key Features:
  • OE quick dissconnects for hoses
  • 1/4 turn drain valves
  • Mounted to engine at the top and bottom of cans
  • Toolless removal & draining

Available now: Click for QWKcans
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post #2 of 61 (permalink) Old 02-25-2010, 11:34 AM
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looks good to me

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post #3 of 61 (permalink) Old 02-25-2010, 12:01 PM
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Just placed my order. I was about to order a competitors but like the features of yours. Thanks.

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post #4 of 61 (permalink) Old 02-25-2010, 12:03 PM
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OK, so now there is yet another issue I need to know about my car. What is oil blow by, why is it a unique issue with a SC, and how do these catch cans solve it?
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post #5 of 61 (permalink) Old 02-25-2010, 12:25 PM
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OK, so now there is yet another issue I need to know about my car. What is oil blow by, why is it a unique issue with a SC, and how do these catch cans solve it?
Oil blow-by is the little bit of "stuff" that gets past the rings in the combustion chamber - the stuff that burns and is supposed to go out the exhaust when the cylinder is done with it. All cars have a bit of blow-by, but as things age and wear (the rings on the pistons), you get more blow-by ("leakage").

This blow-by is a mixture of oil, fuel, and combustion byproducts - it appears as a "vapor" that contains the oil, fuel, and the gasses from the combustion.

It is normally sucked into the intake (and then into the cylinders) where it is burned off without any problems.

But with a supercharger, the intake passes through supercharger (where it gets hot) and then inter-cooler (to cool it back down) before it gets into the cylinders. The problem is that the blow-by can leave an "oily film" on the inside passages of the inter-cooler, which acts as an insulator and reduces the inter-cooler's ability to cool the intake.

A catch can helps prevent this by passing the blow-by into a big open can where it gets a chance for the oil/fuel to settle out of the vapors and collect in the bottom of the catch can. The gases continue to pass through to the intake (or some people vent it to the air) where they continue to get burned - but the oil doesn't leave a film on the intake passages or the inter-cooler.

But you have to remember to occasionally drain the oil/fuel collected in the catch can as it accumulates.

A catch can is very helpful for a supercharged/inter-cooled car. But really isn't necessary for a normal (non-supercharged) street driven car. If you drive your non-supercharged car on the track a lot, then you may need one as a car that is at high revs much of the time will be generating more blow-by than a normally driven car. Then again, frequent oil changes will remove the blow-by "gunk" that collects in the oil (hence the reason for changing your oil before or after a track day).




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post #6 of 61 (permalink) Old 02-26-2010, 12:10 PM
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Tim,

Thanks for the patient explanation. Is this an issue for an Elise with a BWR SC and no IC? I use it for autoX and daily driver.
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post #7 of 61 (permalink) Old 02-26-2010, 12:22 PM
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Tim,

Thanks for the patient explanation. Is this an issue for an Elise with a BWR SC and no IC? I use it for autoX and daily driver.
This is an issue for supercharged cars in general. Yes, it may be an issue for an Elise with a BWR SC and no IC.
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post #8 of 61 (permalink) Old 02-26-2010, 01:40 PM
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How tough is it to reach the drain valves? It looks pretty tight to reach the bottom of the cans. Is it possible to drain into a cup so that I don't have "gunk" all over the inside of my engine compartment? Yeah, I'm a little bit of a neat freak.

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post #9 of 61 (permalink) Old 02-26-2010, 01:51 PM
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How tough is it to reach the drain valves? It looks pretty tight to reach the bottom of the cans. Is it possible to drain into a cup so that I don't have "gunk" all over the inside of my engine compartment? Yeah, I'm a little bit of a neat freak.
You'd probably want to remove them from the car, or you could run a hose off the nozzles.

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post #10 of 61 (permalink) Old 02-26-2010, 01:56 PM
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You'd probably want to remove them from the car, or you could run a hose off the nozzles.
That looks easy enough. Only 3 bolts to undo. How often would I have to drain them if it's not being tracked? Just spirited canyon driving every week.

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post #11 of 61 (permalink) Old 02-26-2010, 02:01 PM
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That looks easy enough. Only 3 bolts to undo. How often would I have to drain them if it's not being tracked? Just spirited canyon driving every week.
Check it your first oil change after installation, if there's a very low amount in there you could wait 2 changes next time.

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post #12 of 61 (permalink) Old 02-26-2010, 06:53 PM
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Demonized, Tim says that the benefit of catch cans is to prevent oil buildup in an intercooler, which reduces heat transfer. So if one has a supercharger without an intercooler, what is the benefit?
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post #13 of 61 (permalink) Old 02-26-2010, 07:16 PM
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no oil on your supercharger screws....I had Saikou Michi's cans and when I upgraded my SC from Katana to VF2 the interior of the SC was clean.........I mean you could eat of it....the less gunk gets in the better.......I think that they are a must for an SC setup, that you intend to keep for a long time!

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post #14 of 61 (permalink) Old 03-02-2010, 11:30 AM
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Do you think these are important to have even if you don't track your car?
How important are these to have? Any issue with the smog check? Visual or at the tail pipe?

2008 Exige S240
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post #15 of 61 (permalink) Old 03-02-2010, 11:58 AM
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Do you think these are important to have even if you don't track your car?
How important are these to have? Any issue with the smog check? Visual or at the tail pipe?
They shouldn't cause any problem with the smog check - they still allow the emission systems to function just as well (even better?) than before. However, some over zealous tester might fail you on a visual inspection. Less likely if it uses normal hoses and clamps, but if you use stainless steel braided lines and AN looking covers for the clamps, you are going to raise a red flag.

As for how important are they if you don't track your car? Not very important at all. If they were, manufacturers would put them in the cars themselves.

If fact they do - they have baffles in the valve cover that is designed to separate the oil out of the gases and let it drip back down out of the baffles. However, the problem is that if you run - constantly - at high revs you will be making more gasses that the average expected amount, and the baffles won't get all of the oil out (some will always get by anyway even if you just loaf around in the car). The engine is designed to handle a little bit of oil mixed in with the gasses, but the more you make, the less the system was designed to handle.

The upside:
  • They look cool.
  • They help to keep the intake clean.
  • They help to keep the supercharger/inter-cooler clean and working efficiently (if you have a supercharger/inter-cooler).
The down sides:
  • It will cost you money to purchase (and install if you have a shop do it).
  • You have to drain them (at each oil change at least).
  • You have to close off the drains properly (or you might get some MIL codes as someone had happen to them recently from the vacuum leak that happened from an open drain valve).
  • Possible (but not likely) problems at smog test time.

Bottom line is that for normal driving, you don't need catch cans.
For occasional track time, you may (or may not) need catch cans.
For heavy track time, the catch cans would be a good idea.
For supercharged cars (especially with an inter cooler), catch cans are a great idea.

But no matter what, having catch cans isn't going to hurt the engine as long as it's installed properly (hoses are connected properly).




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post #16 of 61 (permalink) Old 03-02-2010, 12:23 PM Thread Starter
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Thx Tim. Nice explanation. I agree completely.

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post #17 of 61 (permalink) Old 03-02-2010, 12:26 PM Thread Starter
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Updated install picture in our Elise:
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post #18 of 61 (permalink) Old 03-02-2010, 12:58 PM
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So catch cans for my street driven 240S is a good idea? I would do it as long as it wasn't going to cause smog issues and would benefit the supercharger/intercooler and protect the engine.

I am worried about smog because I still am trying to figure out high flow cat issue.

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post #19 of 61 (permalink) Old 03-02-2010, 04:28 PM
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So catch cans for my street driven 240S is a good idea? I would do it as long as it wasn't going to cause smog issues and would benefit the supercharger/intercooler and protect the engine.

I am worried about smog because I still am trying to figure out high flow cat issue.

I ordered these for my Exige S with the hopes they will eliminate the oil smell I believe to be coming from the intake area when driving with my drivers window down.

GHussey - Massachusetts
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post #20 of 61 (permalink) Old 03-02-2010, 04:59 PM
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I ordered these for my Exige S with the hopes they will eliminate the oil smell I believe to be coming from the intake area when driving with my drivers window down.
Ghussey,
Let me know if this solves the oil odor with the window down. I get the same thing on my 08 S240.
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