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Old 01-19-2014, 11:51 AM   #1
1FASTC7
 
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Oil catch can

Anyone install an oil catch can yet?
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Old 01-19-2014, 03:09 PM   #2
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We did a custom setup for the CTS V community and have one for my C7 now. Catch cans will be EXTREMELY important for direct injection to keep the valves clean! Add boost to that equation, and the problem compounds exponentially. Here was the inside of your typical manifold of a CTS V seeing about 12lbs of boost after only 1000 miles!






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Old 01-19-2014, 03:10 PM   #3
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We are working on a C7 bracket for the Apex catch can right now.
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Old 01-19-2014, 03:23 PM   #4
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Ben, what's the bennifit to the dual catch can. Also, I have about 1,400 miles on my c7. If the upper intake looks like that on the Cadillac after a 1,000 miles, How do you clean it and the valves with the direct injection setup?
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Old 01-25-2014, 11:21 PM   #5
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Quote:
Originally Posted by 1FASTC7 View Post
Ben, what's the bennifit to the dual catch can. Also, I have about 1,400 miles on my c7. If the upper intake looks like that on the Cadillac after a 1,000 miles, How do you clean it and the valves with the direct injection setup?
Duals allows the cans to be independent of each other like the factory lines. Plus when running one can, you're creating a restriction unless nearly doubling the outlet to the intake tube.

The GDI Deposit issue is a real problem as the cause is multi layered.
1. No fuel wash from injection system.
2. PCV vapors coat the valve/stem/port
3. EGR particulates add to the issue.
4. Mileage and extended oil change intervals cause compression ring land deposit that sticks rings to the piston increasing blow-by, increasing PCV vapors, increasing valve deposit.
5. The other problem is the deposits in the combustion chamber and injector tip. The injector has a director plate on it, creating multiple spray streams targeting the piston top. The piston top has a very specific shape so when the high pressure fuel streams enter the combustion chamber the shape of the piston will properly distribute the fuel through out the combustion chamber. When the deposit build up covers the injector tip, effecting the director spray pattern, and changes the shape of the top of the piston, the engine is less efficient and less powerful. This condition can be mitigated with the use high quality furl tank additives such as BG's 44K.

90% of the issue is caused by oil vapors from PCV induction. This vapor coats the valve in layers of deposit every time the engine is shut down. These layers build over time and mileage. The light distillates evaporate, leaving the heavier deposits. GDI combustion chamber temperatures are much higher, due to "stratified lean mode" of air fuel mixture, 30:1 to 50:1 Air fuel ratios. The higher temps create a much harder valve deposit, that does not respond well to vaporized induction procedures. Also vaporized induction cleaning is ineffective on variable intake systems.

Here is a test of a GDI vehicle from new to over 60,000 miles. BG Fuel Test http://www.bgprod.com/bgfueltest/. The test was performed on a Ford Taurus SHO TT V6, bought new to run this test. Factory scheduled maintenance was followed till 32,000 miles. The results speak for themselves. The test includes regular oil and fuel analysis, boro-scope pictures and videos, dynamometer testing, and seat of the pants commentary. All of this information is included on the website.

GM Recognizes the issue:
PIP5029C: Engine Misfires Due To Major Carbon Deposits On The Intake And Or Exhaust Valves - (Apr 23, 2013)
But the procedure does not work effectively, you may have to perform this x5 or so and the valves are still not clean.

Look at the second picture in the PI. Notice the mushroom cap of deposit on the valve stems? Do you see the fractured and missing deposit on the valve on the left side of the picture? The fractured deposit can set P0300 P030X DTC's as it passes through the induction system. Possibly, Holding the intake valve open, closing the gap on the spark plug, or holding the exhaust valve open. Customers complaint is MIL or rough running that may have cleared by the time it arrived at the dealership. Cylinder specific or generic P030?, but no indication of a current issue. Until you pull the upper intake plenum and see the fractured valve deposit.
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