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21-07-2011
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Full Flexer
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Join Date: Feb 2010
Posts: 1,138 What Jeep do I drive?: None
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Remanufactured heads
After finding some noob clutter in here it is time to bring this sticky back on track.
Did some research and found there are some cheap replacement heads out there.
Be warned, these heads are not OE parts or produced according to specs.There are a couple of differences.
- Part number is not melted into the heads.
- Core plugs are not even in the head. Surface is milled around the core plug.
- OE heads must have a golden colour. This colour is a heat treatment, making the heads more resistant to heat.
- To much material is cut away on the fake heads.
- Valves are not bimetall.
- have a look at the precombustion chamber is the surface milled or even. If the surface is milled, you have a fake head! Again the golden colour must be there. Plain surfaces are prone to crack.
I will post the warning letter I received from VM Motori later.
Hope this helps to save money, instead of buying twice.
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C30 AMG 3.0L engine doing donuts
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26-07-2011
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Full Flexer
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Join Date: Oct 2008
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in the spirit of preventative maintenance.
My grandfather used to "shim" new radiator caps to increase coolant pressure.
he did this on trucks when he was in the war in the solomons as it helped to prevent "hot spots" in the low compression engines (i am sure this means cavitation) by raising the boiling point of the water. assuming the hoses are in good condition, a few Kpa increase won't hurt. the extra increase in pressure shouldn't blow in the head gasket as the cylinders should have stopped "wandering" by then.
thoughts?
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When Ferret & Antiferret combine, Annihilation!
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26-07-2011
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RubiconSlammer
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Join Date: May 2011
Location: Ipswich, Brisbane.
Posts: 1,250 What Jeep do I drive?: ZJ
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Methinks you are referring to petrol engines as diesels have always been up around the 19:1 comp ratio, whereas '40's petrol trucks were 6:1. I wouldn't be upping the pressure on anything later than an engine built in the '60's. IMHO.
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26-07-2011
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Full Flexer
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Join Date: Oct 2008
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Quote:
Originally Posted by Billnick
Methinks you are referring to petrol engines as diesels have always been up around the 19:1 comp ratio, whereas '40's petrol trucks were 6:1. I wouldn't be upping the pressure on anything later than an engine built in the '60's. IMHO.
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not compression ratio, coolant pressure. it's regulated by the radiator cap and allows excess into the radiator overflow bottle.
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When Ferret & Antiferret combine, Annihilation!
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26-07-2011
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RubiconSlammer
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Join Date: May 2011
Location: Ipswich, Brisbane.
Posts: 1,250 What Jeep do I drive?: ZJ
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Liked 281 Times in 182 Posts
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Quote:
Originally Posted by Antiferret
it helped to prevent "hot spots" in the low compression engines
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That's what I'm saying, if he had a low compression engine it would have been petrol. I wouldn't be upping the radiator pressure on a new engine for fear of blowing a gasket.
Last edited by Billnick; 26-07-2011 at 02:31 PM.
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26-07-2011
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Full Flexer
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Join Date: Feb 2010
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I'm posting a couple of detail pictures of the single head this evening. Just to make clear what we deal with. Coolant lines in this head are real tricky.
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30-08-2011
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Full Flexer
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Join Date: Feb 2010
Posts: 1,138 What Jeep do I drive?: None
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Hopefully the intresting details are readable
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C30 AMG 3.0L engine doing donuts
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