(Leakdown Test) Air coming out adjacent cylinder

1 Fly SI · 08-20-2007, 08:30 AM

I did a leakdown test on my b16a. I put it at tdc and pressurized cyl 1, air came out cyl 2. Then I put cyl 2 at tdc and pressurized, air came from cyl 1. I thought it was a blown HG,so I pulled the head. The motor has arp headstuds and they were tight. The headgasket looks new. Could it be a warped head or something else?
TIA
-Thomas

thesmogman · 08-20-2007, 08:39 AM

I have seen heads that have dug out a pit in the head between cyl's.

Lay a straight edge on it and see if it is warped.

1 Fly SI · 08-20-2007, 08:50 AM

I already took it to the machine shop. I am going to have it decked. I just wanted more info to see if it could be something else. The head looked good also. No pits.
Someone here in town said cracked head,or bent valve, but I really don't see how it would do this.

thesmogman · 08-20-2007, 08:56 AM

Cracked yes. Valve no.

I guess we will know more in a bit. Huh.

1 Fly SI · 08-20-2007, 09:08 AM

Where could it be cracked to let air go from cyl to cyl? I don't know if I should have it vaccum tested or not?

thesmogman · 08-20-2007, 10:35 AM

It would have to be between combustion chamber to combustion chamber. Sometimes you can see it some not. But it can be repaired.

Take a look at the area that connects between the sleeves in the block. If it was the block it would be a cracked sleeve

doubleA · 08-20-2007, 11:26 AM

Either your head or block are not straight. But to me it sounds like a headgasket problem.

TooManyTickets · 08-20-2007, 12:25 PM

if you having the head decked you may as well finish the bit and resurface the block if u need to 100% sure

1 Fly SI · 08-20-2007, 01:46 PM

Thanks for the replies.The block is still in the car, I will try to get a straight edge soon. I looked at the head pretty good and didn't see anything, But it doesn't mean it isn't there. The cylinders look great. I thought it was a HG also but the thing is brand new looking.

1 Fly SI · 08-21-2007, 04:55 PM

Ok so they said it was straight and didn't need to be decked. They pressure tested it and vaccum tested it. Both came back with perfect results.

But I still don't under stand?

1 Fly SI · 08-22-2007, 04:11 PM

^^^

cpl rampage · 08-23-2007, 08:32 AM

Either a warped deck, sunk sleeves, or cracked sleeves, or a bad hg, but u said it looked good

TooManyTickets · 08-23-2007, 09:01 AM

Check the deck on the block.

08-20-2007, 08:30 AM	#1
1 Fly SI Honda-Tech Member Garage is empty, add now Join Date: Aug 2006 Location: Right near the beach BOI, Ga Posts: 2,246 iTrader Rating: (0)	(Leakdown Test) Air coming out adjacent cylinder I did a leakdown test on my b16a. I put it at tdc and pressurized cyl 1, air came out cyl 2. Then I put cyl 2 at tdc and pressurized, air came from cyl 1. I thought it was a blown HG,so I pulled the head. The motor has arp headstuds and they were tight. The headgasket looks new. Could it be a warped head or something else? TIA -Thomas

08-20-2007, 08:39 AM	#2
thesmogman Honda-Tech Member 1988 Honda CRX My Garage Join Date: Dec 2005 Location: San Ramon/Pleasanton, CA, USA Posts: 1,722 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (1 Fly SI) I have seen heads that have dug out a pit in the head between cyl's. Lay a straight edge on it and see if it is warped. __________________ If you spent the time to fix it.... Fix it better than it was!

08-20-2007, 08:50 AM	#3
1 Fly SI Honda-Tech Member Garage is empty, add now Join Date: Aug 2006 Location: Right near the beach BOI, Ga Posts: 2,246 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (thesmogman) I already took it to the machine shop. I am going to have it decked. I just wanted more info to see if it could be something else. The head looked good also. No pits. Someone here in town said cracked head,or bent valve, but I really don't see how it would do this.

08-20-2007, 08:56 AM	#4
thesmogman Honda-Tech Member 1988 Honda CRX My Garage Join Date: Dec 2005 Location: San Ramon/Pleasanton, CA, USA Posts: 1,722 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (1 Fly SI) Cracked yes. Valve no. I guess we will know more in a bit. Huh. __________________ If you spent the time to fix it.... Fix it better than it was!

08-20-2007, 09:08 AM	#5
1 Fly SI Honda-Tech Member Garage is empty, add now Join Date: Aug 2006 Location: Right near the beach BOI, Ga Posts: 2,246 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (thesmogman) Where could it be cracked to let air go from cyl to cyl? I don't know if I should have it vaccum tested or not?

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08-20-2007, 10:35 AM	#6
thesmogman Honda-Tech Member 1988 Honda CRX My Garage Join Date: Dec 2005 Location: San Ramon/Pleasanton, CA, USA Posts: 1,722 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (1 Fly SI) It would have to be between combustion chamber to combustion chamber. Sometimes you can see it some not. But it can be repaired. Take a look at the area that connects between the sleeves in the block. If it was the block it would be a cracked sleeve __________________ If you spent the time to fix it.... Fix it better than it was!

08-20-2007, 11:26 AM	#7
doubleA Garage is empty, add now Join Date: Feb 2005 Location: Twin Cities Posts: 460 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (thesmogman) Either your head or block are not straight. But to me it sounds like a headgasket problem. __________________ "Lag is just anticipation of your opponents embarrasment "

08-20-2007, 12:25 PM	#8
TooManyTickets Garage is empty, add now Join Date: May 2007 Location: South OC, CA, USA Posts: 179 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (doubleA) if you having the head decked you may as well finish the bit and resurface the block if u need to 100% sure __________________ Q: How fast will my car be? [quote=ek forever guy] A: "Depends on the diameter of the hampster wheel you're running and it's final drive." - Sochiro Honda. [/quote] [img]http://images.honda-tech.com/set1/smile/emsmileo.gif[/img]

08-20-2007, 01:46 PM	#9
1 Fly SI Honda-Tech Member Garage is empty, add now Join Date: Aug 2006 Location: Right near the beach BOI, Ga Posts: 2,246 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (TooManyTickets) Thanks for the replies.The block is still in the car, I will try to get a straight edge soon. I looked at the head pretty good and didn't see anything, But it doesn't mean it isn't there. The cylinders look great. I thought it was a HG also but the thing is brand new looking.

08-21-2007, 04:55 PM	#10
1 Fly SI Honda-Tech Member Garage is empty, add now Join Date: Aug 2006 Location: Right near the beach BOI, Ga Posts: 2,246 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (1 Fly SI) Ok so they said it was straight and didn't need to be decked. They pressure tested it and vaccum tested it. Both came back with perfect results. But I still don't under stand?

08-22-2007, 04:11 PM	#11
1 Fly SI Honda-Tech Member Garage is empty, add now Join Date: Aug 2006 Location: Right near the beach BOI, Ga Posts: 2,246 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (1 Fly SI) ^^^

08-23-2007, 08:32 AM	#12
cpl rampage Honda-Tech Member Garage is empty, add now Join Date: Feb 2007 Location: attleboro, ma Posts: 536 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (1 Fly SI) Either a warped deck, sunk sleeves, or cracked sleeves, or a bad hg, but u said it looked good __________________ 95 Civic EX-Turbo'd Engine built and tuned by me - Stolen... 03 TL Type S

08-23-2007, 09:01 AM	#13
TooManyTickets Garage is empty, add now Join Date: May 2007 Location: South OC, CA, USA Posts: 179 iTrader Rating: (0)	Re: (Leakdown Test) Air coming out adjacent cylinder (cpl rampage) Check the deck on the block. __________________ Q: How fast will my car be? [quote=ek forever guy] A: "Depends on the diameter of the hampster wheel you're running and it's final drive." - Sochiro Honda. [/quote] [img]http://images.honda-tech.com/set1/smile/emsmileo.gif[/img]

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(Leakdown Test) Air coming out adjacent cylinder