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oil leak from head stud
Posted: Sun May 27, 2012 8:14 pm
by Seight-V8
noticed a small oil leak on my engine a while back but couldn't find where it was coming from.
Yesterday i noticed it looks to be coming from a head bolt hole, the one on the right side of where the engine number is.
Its not a bad leak, but just wondering if my head gaskets gone already.
Only done 400 miles since i rebuilt the 4.6, and i used elring composite gaskets.
Anyone else had this problem?
cheers
scott
Posted: Sun May 27, 2012 8:57 pm
by kokkolanpoika
http://www.v8forum.co.uk/forum/viewtopi ... highlight=
Similar like your´s ?
I replace my heads gasket in this winter, and i didin´t notice any sign of crack etc.
I think those 97mm performance head gasket are totally crap, too mutch graphite and it will flow away when oil is sucked in it..
Elring is usually goog quality..
Posted: Sun May 27, 2012 11:37 pm
by stevieturbo
Always used Payen head gaskets on my 4.6
Wouldnt use anything else really. Payen are OEM quality
Posted: Mon May 28, 2012 4:54 am
by sidecar
Posted: Mon May 28, 2012 5:26 am
by softdash3.9
Elring are OEM gaskets
Just replaced mine on the RR recently
Posted: Mon May 28, 2012 8:50 am
by stevieturbo
Never on a RV8, but they are common place on most modern engines.
Head/deck finish needs to be very smooth, but they do work very well and can handle lots of boost.
Posted: Mon May 28, 2012 9:07 am
by ChrisJC
I have had this problem too.
I determined that the head clamping was on the fire-rings (correctly), but that didn't compress the seal around the oil feed to the head or the water jacket.
I forget the head gasket type unfortunately.
Chris.
Posted: Mon May 28, 2012 9:01 pm
by Seight-V8
been looking for some replacement head gaskets and didnt really want to buy any off ebay but i found these from RPI.
http://www.ebay.co.uk/itm/V8-composite- ... 27c6aca6cc
Anyone used them and have any comments.
cheers
scott
Posted: Tue May 29, 2012 4:52 am
by sidecar
I've used them before, they seem OK. I did blow a set but I think that I was using too much NOS.
The problem is that there is a huge taper at the top of the RV8 bores which means that half of the fire ring is floating about and not under compression. I think this is why some of us have gasket issues with tuned engines where the peak cylinder pressure is very high.
Posted: Tue May 29, 2012 8:38 am
by DEVONMAN
sidecar wrote:
I've used them before, they seem OK. I did blow a set but I think that I was using too much NOS.
The problem is that there is a huge taper at the top of the RV8 bores which means that half of the fire ring is floating about and not under compression. I think this is why some of us have gasket issues with tuned engines where the peak cylinder pressure is very high.
Real Steel do those gaskets at 2/3 the price.
Note the copper strengthening at the waterways.
I always use these.
I would not install a gasket if the fire ring sits patrtially on the chamfer at the top of the bore. --95mm and 96mm gaskets are available.
Cheers Denis
Posted: Tue May 29, 2012 1:15 pm
by DaveEFI
Bought a top end set off Ebay for my SD1. Composite head gaskets for the 'new' heads.
It arrived this morning and a quick glance says it's well made. And excellent value. It's this one:-
http://cgi.ebay.co.uk/120367506928
Posted: Wed May 30, 2012 1:10 pm
by SimpleSimon
stevieturbo wrote:
Never on a RV8, but they are common place on most modern engines.
Head/deck finish needs to be very smooth, but they do work very well and can handle lots of boost.
Very true, they are not tolerant to any warpage, in fact they blow the sheets away one by one if the engine as been boiled up
I have seen this many times on Honda Accords when the rad as failed and the owner is stupid, generally you don't get away with an overheating situation once its occurred with the multi sheet design
but not working outside what they are designed for (i.e overheating) they are def stronger.
Posted: Wed May 30, 2012 8:12 pm
by mgbv8
SimpleSimon wrote:stevieturbo wrote:
Never on a RV8, but they are common place on most modern engines.
Head/deck finish needs to be very smooth, but they do work very well and can handle lots of boost.
Very true, they are not tolerant to any warpage, in fact they blow the sheets away one by one if the engine as been boiled up
I have seen this many times on Honda Accords when the rad as failed and the owner is stupid, generally you don't get away with an overheating situation once its occurred with the multi sheet design
but not working outside what they are designed for (i.e overheating) they are def stronger.
Darn it!!
Those are what I bought for my new build. I paid £152 for them
Posted: Thu May 31, 2012 4:46 am
by sidecar
I noticed that you can get the MLS jobbies for a 96mm bore which is handy because of the large taper at the top of the 94mm standard bore. My firing ring is also half hanging in mid air because of this. I wish that I'd found these gaskets before my last re-build.
Point noted about the overheating and these gaskets, I run my lump at 75-80 degrees and I am careful not to let it overheat.