blown turbo head gasket at 10psi
08-08-2002, 05:27 PM
#1
Guest
Posts: n/a
blown turbo head gasket at 10psi
Here is an update and a cry for advice!
I removed the head and found everything in order except
The head gasket is blown thru on #2 and deformed on 4 other cyl.
The only cylinder ok was #6 . [It must be slacking! ]
I have good digital photos if you want.
This was the first time I ran hard with 10 psi boost [1983 280ZXT]
so I suspect that did it.
Help!
What do I do? What gasket will hold up?
Thanks
At 01:59 PM 8/8/2002 -0500, DAVE wrote:
>
>On Sunday I felt the engine developed a big exhaust leak on cyl#1 and
>seemed low on power.
>I did a compression test with warm engine, and Throttle open.
>Cyl 1: fast climb to 90 and increase to 145.
>Cyl 2: slow climb to 75
>Cyl 3 - 6: fast climb to 90 and increase to 145.
>
>I then put a capfull of engine oil in #2 and got 85. I noticed whitish
>cloud near the throttle body.
>
>So am I looking at a carboned valve or broken piston ring?
>The car has been running extremely rich for 800 miles.
>
>Thanks
>
>
I removed the head and found everything in order except
The head gasket is blown thru on #2 and deformed on 4 other cyl.
The only cylinder ok was #6 . [It must be slacking! ]
I have good digital photos if you want.
This was the first time I ran hard with 10 psi boost [1983 280ZXT]
so I suspect that did it.
Help!
What do I do? What gasket will hold up?
Thanks
At 01:59 PM 8/8/2002 -0500, DAVE wrote:
>
>On Sunday I felt the engine developed a big exhaust leak on cyl#1 and
>seemed low on power.
>I did a compression test with warm engine, and Throttle open.
>Cyl 1: fast climb to 90 and increase to 145.
>Cyl 2: slow climb to 75
>Cyl 3 - 6: fast climb to 90 and increase to 145.
>
>I then put a capfull of engine oil in #2 and got 85. I noticed whitish
>cloud near the throttle body.
>
>So am I looking at a carboned valve or broken piston ring?
>The car has been running extremely rich for 800 miles.
>
>Thanks
>
>
08-08-2002, 08:58 PM
#4
Dead
Join Date: Jan 2002
Location: Idaho
Posts: 162
Re: blown turbo head gasket at 10psi
SCE Gasket... Get your block o-ringed at a machine shop and make dang sure that you block and head are flat before you put it together. Use a gasket sealer on your copper gasket that contains hylomar. Most of the other stuff will leak.
-jeremy-
-jeremy-
08-09-2002, 02:59 AM
#7
Guest
Posts: n/a
Re: blown turbo head gasket at 10psi
I wonder if the gasket blew because it was 104k miles and 20 yrs old or was it detonation?
The gasket material seems good. It's just deformed by pressure in 5 cylinders.
Apparently the stock gasket has survived 14 psi often. A metal gasket [$160] is stronger than a piston ring so I better stick with the stock gasket [$20], I can fix gasket easier.
I heard a rattling at 5000 rpm and 10 psi. like when there is mucous in the lungs. NOT a ping ping that I associate with Detonation. What does pre-ignition sound like. Remember the engine was super rich as indicated by plugs, black smoke, and EGT guage never ovr 1300F. All combust chamb look the same - black soot, no scale build up like my other head. the sound got louder until I noticed a drop in power. 1/6 [17%]aprox or is it 75psi/145psi of 1/6??? It felt like 40% less!!!
I am going to get a fuel pres guage and reduce the richness. I didnt think it was dangerous, just wastefull.
Any suggestions?
The gasket material seems good. It's just deformed by pressure in 5 cylinders.
Apparently the stock gasket has survived 14 psi often. A metal gasket [$160] is stronger than a piston ring so I better stick with the stock gasket [$20], I can fix gasket easier.
I heard a rattling at 5000 rpm and 10 psi. like when there is mucous in the lungs. NOT a ping ping that I associate with Detonation. What does pre-ignition sound like. Remember the engine was super rich as indicated by plugs, black smoke, and EGT guage never ovr 1300F. All combust chamb look the same - black soot, no scale build up like my other head. the sound got louder until I noticed a drop in power. 1/6 [17%]aprox or is it 75psi/145psi of 1/6??? It felt like 40% less!!!
I am going to get a fuel pres guage and reduce the richness. I didnt think it was dangerous, just wastefull.
Any suggestions?
08-09-2002, 05:12 AM
#8
Registered User
Join Date: Dec 2000
Location: Rochester, NY
Posts: 128
Re: blown turbo head gasket at 10psi
my head gasket went away last year and i did the following: nismo/hks metal head gasket [choice of either 1 or 2mm depending on your compression ratio requirements] and head studs-not bolts. i used arp. called them direct to understand the difference b/w studs [i was using the nissan turbo bolts] vs. bolts. here's the skinny-studs provide greater clamping pressure also allow more consistent torquing. due to the nature of the stud material the clamping pressure increases as the head comes up to temp [alum. expands as it heats] but the studs don't expand/stretch. it took an engineer 30min. to explain all of this to me. follow the directions on the arp box for tq specs. i listened to someone who i thought was a reputable engine builder who sold me the studs [he rcmd a much higher tq than arp] and i sheared a stud off in the block-able to get it out but...
anyway, running more boost now and have seen no probs so far [knockin' on wood].
hope this helps!
David
1TuffZ
zccr.net
anyway, running more boost now and have seen no probs so far [knockin' on wood].
hope this helps!
David
1TuffZ
zccr.net
08-12-2002, 11:56 AM
#10
Registered User
Join Date: Dec 2000
Location: Rochester, NY
Posts: 128
Re: blown turbo head gasket at 10psi
i believe the arp stud kit was retail from arp $141.16, less thru a local source, good for more hp, don't know how much exactly. website:
www.arp-bolts.com
also: [info on studs]
http://www.arp-bolts.com/pages/produ...headstuds.html
part #202-4206
David
1TuffZ
zccr.net
www.arp-bolts.com
also: [info on studs]
http://www.arp-bolts.com/pages/produ...headstuds.html
part #202-4206
David
1TuffZ
zccr.net
Thread
Thread Starter
Forum
Replies
Last Post
borini63
FS: 240Z,260Z,280Z & 280ZX (70-83)
3
09-13-2012 11:00 AM
Bookmarks
