thehelix112 Posted February 27, 2006 Share Posted February 27, 2006 Guys, After blowing 2 head gaskets in quick succession with not much detonation I started to think something was up. Low and behold the L28E head gasket I ordered last time blocks two water jackets between #2,3 and #5,6 on my F54/P90. Which would account for blowing #2,3 this time, and #5 last time. I just got a hold of the L28ET VRS kit (PN A1042-P792F) and the head gasket in this one does NOT block these two water jackets! PN for this gasket is 11044-P7911 according to the slip in the VRS kit. I also had a peer at the pic of HKS(Nismo?) 2mm head gasket and this gasket looks like it has the water jacket holes in the wrong places too. Though interestingly, the L28ET head gasket has a lot of the holes along the top for coolant flow on the spark plug side (top in that nismo pic) blanked off. Will be interesting to see how this one goes. Dave Quote Link to comment Share on other sites More sharing options...
Drax240z Posted August 17, 2009 Share Posted August 17, 2009 (edited) Bump, I know it's a post from the dead, but any followup? I need to order a new headgasket for a 280z block and a P90 head... The 11044-P7911 is the right one for the head... Edited August 17, 2009 by Drax240z Quote Link to comment Share on other sites More sharing options...
Robert Posted August 21, 2009 Share Posted August 21, 2009 In my experience, Nissan gaskets are bullet proof. A L24E stock gasket can support 300+ hp with detonations (tested and retested!) Is your cylinder head straight? 100%? Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted August 21, 2009 Share Posted August 21, 2009 Guys, After blowing 2 head gaskets in quick succession with not much detonation ... Detonation? ANY pre-ignition is a bad thing no matter what gasket is used! Is this a turbocharged engine? How are you controlling your spark and your fuel at boost? Do you have a wideband O2 sensor to confirm the mixture? As far as cooling holes, they vary even among brand names. Most times it makes no difference since coolant still flows along the entirety of the head. Also it get's a bit interesting to match up when people start swapping heads and block combinations. If you're REALLY thinking that you have a hotspot then you can dust the top of the block with something like chalk and lay a new gasket on top to mark where the the holes are. Use a drill press and a small file to "match" the gasket to the head. I did a gasket match on the last turbo engine I built this summer but to be honest I don't have 6 temp probes along the head(so I can't tell if it's really having any impact on a cylinder to cylinder basis). I can't tell any difference in drivability but then this one is a MegaSquirt II engine and I've adjusted fuel/spark to not detonate with the fuel I'm using. Quote Link to comment Share on other sites More sharing options...
Robert Posted August 21, 2009 Share Posted August 21, 2009 Detonation? ANY pre-ignition is a bad thing no matter what gasket is used! Is this a turbocharged engine? How are you controlling your spark and your fuel at boost? Do you have a wideband O2 sensor to confirm the mixture? As far as cooling holes, they vary even among brand names. Most times it makes no difference since coolant still flows along the entirety of the head. Also it get's a bit interesting to match up when people start swapping heads and block combinations. If you're REALLY thinking that you have a hotspot then you can dust the top of the block with something like chalk and lay a new gasket on top to mark where the the holes are. Use a drill press and a small file to "match" the gasket to the head. I did a gasket match on the last turbo engine I built this summer but to be honest I don't have 6 temp probes along the head(so I can't tell if it's really having any impact on a cylinder to cylinder basis). I can't tell any difference in drivability but then this one is a MegaSquirt II engine and I've adjusted fuel/spark to not detonate with the fuel I'm using. Still, If the head is straight, it takes A LOT too break a head gasket, and if its a Nissan gasket, they handle A LOT in my experience. Unless theres a Whooole lot of HP in there, or SEVERE detonation, I dont think detonation is his problem.... Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted August 21, 2009 Share Posted August 21, 2009 Still, If the head is straight.... If the problem was isolated to one end of the head, I'd agree. I'm assuming he's checked both head and block and installing it to spec because that's the right way to do it. Quote Link to comment Share on other sites More sharing options...
Robert Posted August 22, 2009 Share Posted August 22, 2009 If the problem was isolated to one end of the head, I'd agree.I'm assuming he's checked both head and block and installing it to spec because that's the right way to do it. Agreed. Any parts with bendscracks and so on can cause these issues. Also, a bended head typically causes problems on the center cylinders, 2-5, and especially 3 and 4. Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted August 22, 2009 Share Posted August 22, 2009 Agreed. Any parts with bendscracks and so on can cause these issues. Also, a bended head typically causes problems on the center cylinders, 2-5, and especially 3 and 4. AH! True. I guess I never had a head with a really nasty twist. I never thought of that. Quote Link to comment Share on other sites More sharing options...
z-ya Posted August 22, 2009 Share Posted August 22, 2009 In my experience, Nissan gaskets are bullet proof. A L24E stock gasket can support 300+ hp with detonations (tested and retested!) Is your cylinder head straight? 100%? Ditto... Quote Link to comment Share on other sites More sharing options...
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