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Low oil and No Vtec

 
Old 10-30-2018, 05:04 AM
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Default Low oil and No Vtec

Hello there. This situation doesn't happened with me but i would like to know the trueness of that.

Imagine the follow situation: We accelerate the car and notice no VTEC engaging, we stop the car and when we open the hood the oil cap was lost and lot of oil spill over the motor. We check the oil level on the dip stick and it was at more or less 30% (between L and H). We change oil and filter, clean the motor and everything goes back to normal.

What i want to know is if with 30% of oil we could face issue with VTEC or if we need to be way bellow (below L mark) for no VTEC.
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Old 10-30-2018, 05:24 AM
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AFAIK, it's oil pressure which is monitored, re: VTEC activation. So whatever level triggers the critically low pressure, I guess.
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Old 10-30-2018, 05:30 AM
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Any oil level between L and H would give you sufficient oil pressure, so it would not be the cause of not having vtec engage. Was the motor fully warmed, a cold engine will not allow vtec to engage. The old oil cap fell off because the rubber seal was worn out and no longer provided the necessary tension to keep it tight.
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Old 10-30-2018, 06:00 AM
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Basically my familly bought a s2000 and after 3 days of normal use (no race, track, drag, drift, whatsoever) we have a rod knocking... And this is the b*****t story the previous owner told when we have seen some residual oil around the engine. Since i know a little about Honda engines i have the idea to not have vtec (because of low oil) the level of oil need to be way down to have issues on oil pressure. I just ask you guys about this so i can have some solid information and prove with lawyer that he let the engine run without oil and sell the car knowing the issue and scam us.
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Old 10-30-2018, 06:47 AM
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Maybe take it to a reliable mechanic who knows the S2000, for a complete checkup? Including compression test and oil pressure test.

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Old 10-30-2018, 07:31 AM
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Already i've done that and also a compression test and results are a bit low, but since i didn't authorize disassembly the engine there's not much more they can do. If required i will proceed with more tests and disassembly but i don't want to continue beating an engine on those conditions (unless things get nasty with the seller).

I've been just thinking about that story and i just write this post to check with you guys and confirm if with the oil level between L and H we can experience low oil pressure and not engage vtec
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Old 10-30-2018, 11:20 AM
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Even if the oil is right on the L mark, or even 1/2” under that, it will do no harm. It will not affect VTEC in any way.

The oil level has to get real low, enough for the oil pump to suck air.

Even if there was only 1/8” of oil showing on the bottom tip of the stick, you will not lose oil pressure.

YOU did not harm the car based on your description. It is completely possible for the previous owner to stave the car of oil, and have the problem surface many thousand miles later.

Last edited by Billman250; 10-30-2018 at 11:24 AM.
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Old 10-30-2018, 01:29 PM
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We all know the s2k is a very sensitive with oil levels and since the engine discussed is a F20C even more sensitive (for what i've been reading). What i think it happened here is: Car lost oil, a lot of oil and have low pressure, resulting in no vtec engaging and also low pressure for proper rod bearings lubrication. The previous owner notice that and before having noticeable symptons just sells the car. So we bought the car, and i drive it and seems fine... i've put like 500miles just highway at ~65mph (i think i just hit vtec 1 or 2 times) and on the last time i drove the car i just met with a guy, near a auto repair shop, that knows a lot about of s2000 (and has one) to just make a couple of pulls to check if everything is fine (nothing crazy, just a couple of miles) and when i got back to the shop and stop on a stop signal i hear a knocking sound on the engine (at the beginning we think was something else but after closer look was definitly a rod knock) we test the compression and values was a bit low having the #3 cylinder way low than others (~200psi, ~205psi, ~180psi, ~200psi)

This story of loosing oil cap and no vtec was all tolded by the previous owner, now i'm just putting the pieces of the puzzle together and trying to guess what could really happens (based on the story he told)
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