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Hi people: has anyone done a compression test on the engine before and after the spin on conversion was made? Does the compression decrease/increase or stays the same? Some sensors could malfunction if the pressure decreases. I would like some feedback on compression before making the change. Thanks
 

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compression test??? how the heck is the filter going to effect compression at all?
 

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The oil filter really shouldn't affect compresion. The spin on is used on the Mazda3 2.3L without issue so I don't see where there is any real risk that compression on the 6i would be affected by either:

a) Too little oil pressure leading to poor cylinder lubrication and piston ring sealing.

or

b) Too little oil pressure for proper lubrication leading to excessive engine wear and lower compression.

There may be a slight change (+ or -) in the oil pressure but this may be more a function of the drain-back valve in the filter cartridge which seems to work OK the Mazda 3. There is only one 'almost no oil pressure' sensor which turns on the dash light, so no finicky sensors to worry about.
 

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Discussion Starter #4
The oil filter really shouldn't affect compresion. The spin on is used on the Mazda3 2.3L without issue so I don't see where there is any real risk that compression on the 6i would be affected by either:

a) Too little oil pressure leading to poor cylinder lubrication and piston ring sealing.

or

b) Too little oil pressure for proper lubrication leading to excessive engine wear and lower compression.

There may be a slight change (+ or -) in the oil pressure but this may be more a function of the drain-back valve in the filter cartridge which seems to work OK the Mazda 3. There is only one 'almost no oil pressure' sensor which turns on the dash light, so no finicky sensors to worry about.
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Thanks for the info. I haven’t physically seen the conversion kit, but if it gives more area for oil circulation, it will definitely lower the oil pressure. Then I guess we should buy the smallest K&N oil filter that will fit. This will make up for the additional area if this was the case.
 

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I think the oil pump is capable of supplying waaaay more oil that than the engine can possibly circulate so an oil filter shuldn't reduce the oil pressure in the galleys unless it has a much smaller flow rate. It would be interesting to see some measurements, but I would be surprised if the pressure difference was more than a pound due to filter difference. It looks like a pretty good sized spin-on filter element so it seems circulation would not be an issue. (I'm starting to get tired of the cartidge BS on oil changes.... :swearin: )
 

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Hi people: has anyone done a compression test on the engine before and after the spin on conversion was made? Does the compression decrease/increase or stays the same? Some sensors could malfunction if the pressure decreases. I would like some feedback on compression before making the change. Thanks
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here
 
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