Mysterious plug on back left corner of b18c1 block.HELP!

 
Old 04-03-2019, 05:56 PM
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Default Mysterious plug on back left corner of b18c1 block.HELP!






Hello guys, I found this hex plug inside my block on the back left corner. My old block did not have this plug. This is a css b18c1 block that I got used..I had a machine shop look over it and they said it's good. My old block is a jdm b18c but I'm not sure if that makes a difference. Should.i leave the plug in there or remove it? Does anyone know what it is for?
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Old 04-03-2019, 11:16 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

this is just my thoughts on it so dont take my word for it, but perhaps that was to plug the vtec oil feed because someone decided to go with an external oil feed for vtec or perhaps they had the cams locked for vtec killer cams and removed the vtec solenoid so oil supply was not needed any more. one other crazy idea is that they had a none vtec head on the block. im not even 100% sure that that is the vtec oil supply port or not.
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Old 04-04-2019, 02:51 AM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by bigjon1378 View Post
this is just my thoughts on it so dont take my word for it, but perhaps that was to plug the vtec oil feed because someone decided to go with an external oil feed for vtec or perhaps they had the cams locked for vtec killer cams and removed the vtec solenoid so oil supply was not needed any more. one other crazy idea is that they had a none vtec head on the block. im not even 100% sure that that is the vtec oil supply port or not.
Thanks those are good ideas. I will just remove it because my other block did not have it. Also this block has the oil squirt block off but idk if this has anything to do with that.
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Old 04-04-2019, 09:17 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

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Old 04-04-2019, 09:26 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by motoxxxman View Post
don't listen to the comment above. That is NOT the vtec oil supply port. Do not remove the plug. I think it drops down into a coolant jacket, and it needs to stay plugged. Put the plug back in. It's there for a reason.
Like I said I wasn't sure if I was right just sharing my thoughts, not facts
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Old 04-04-2019, 09:30 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by motoxxxman View Post
don't listen to the comment above. That is NOT the vtec oil supply port. Do not remove the plug. I think it drops down into a coolant jacket, and it needs to stay plugged. Put the plug back in. It's there for a reason.
After some research it IS infact the vtec oil supply.
Please do some research yourself if you still don't agree
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Old 04-04-2019, 09:34 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!


B20 block

GSR block

Vtec head plugged for an ls vtec conversion
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Old 04-05-2019, 04:31 AM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!



The main reason why I'm confused is that my current block B18C does not have that plug and it seems the threads were made by someone and it's not factory. They are both Gsr blocks. Maybe the last owner used an external vtec line I guess. If anything I'll just have to pull the head off again. I will just run it how my old block looks. Thanks for the help guys.
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Old 04-05-2019, 11:28 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

That is not an original hole/plug. Someone drilled the hole and plugged it. I suggest you leave the plug in the hole. The teardrop shaped hole that you have circled IS the VTEC oil passage that meets the inlet port in the head.
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Old 04-06-2019, 12:02 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by JRCivic1 View Post
That is not an original hole/plug. Someone drilled the hole and plugged it. I suggest you leave the plug in the hole. The teardrop shaped hole that you have circled IS the VTEC oil passage that meets the inlet port in the head.
The plug was In the tear drop hole. Thanks for confirming that it's for the vtec.
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Old 04-06-2019, 06:25 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Oh, my bad. I thought there was a threaded hole directly under where the plug is sitting on the block surface now. The first pic appears to show the plug sitting flush with the top of the block... optical illusion.
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Old 04-06-2019, 06:27 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Yeah, one might plug this hole on a VTEC block when using a non-VTEC cylinder head on top... otherwise you have a really bad pressurized oil leak.
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Old 04-07-2019, 03:58 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by JRCivic1 View Post
Yeah, one might plug this hole on a VTEC block when using a non-VTEC cylinder head on top... otherwise you have a really bad pressurized oil leak.
So I can just hope my vtec works and I have normal oil pressure lol. Good thing my other block is still good. Just incase
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Old 04-22-2019, 11:08 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

you need oil line to your head if you block this off. with vtec or no vtec, still need oil pressure to the head.
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Old 04-23-2019, 05:27 AM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by turbociv910 View Post
you need oil line to your head if you block this off. with vtec or no vtec, still need oil pressure to the head.
That oil passage only exists on vtec blocks and is the reason why you have to run an external like when going LS/b20 vtec
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Old 04-24-2019, 04:40 PM
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Default Re: Mysterious plug on back left corner of b18c1 block.HELP!

Originally Posted by bigjon1378 View Post
That oil passage only exists on vtec blocks and is the reason why you have to run an external like when going LS/b20 vtec
Yes OP, as bigjon just stated, the passage that was blocked off in your block is only for the VTEC rocker arm circuit and thus doesn't exist in a non-VTEC block. Oil for lubricating the head comes through the passage directly behind the middle head bolt hole on the Intake side of the block... you can see it above in the GSR block picture... it has an aluminum restrictor with an O-ring on it. It (the restrictor) is missing on the B20 block pictured above.
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