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  #1  
Old January 25th, 2016, 02:14 PM
DocB
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David
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Fractured exhaust manifold

Well along with a few other issues that surfaced this morning, the #1 cylinder portion of the exhaust manifold on my 2.5Lpetrol fractured. I was expecting this but hoping for the best for a while. When I purchased the car in Italy it had a very incorrect settings for the carb and ended up detonating in the manifold, fracturing it. A friend and I welded it in a hurry as I needed to ship it to the US the following day. It's not the best weld job in the first place, but what hakes it super awesome is that we couldn't get out hands on any rods suitable for welding cast iron. A lot of people told us that it was impossible. Well it worked.... until now.

I plan to keep this car for a long time and I don't plan to repurchase parts. For example, something breaks, replace it with a performance part so I don't end up replacing a new part later when I want to upgrade.


On to the question...
Is there a point to trying to find/create a performance exhaust manifold for a 2.5L petrol? I've found an original replacement for just under $300, and an aftermarket for $75. From those options, I'll definitely go with the aftermarket. I'm broke AF lol. I've also found a "performance" tubular exhaust online for something like 400gbp. I think I could just shop around and have someone fab something for that price. Thoughts?

tl:dr version:
Is anything but the stock exhaust worth the money on a 2.5 petrol?
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  #2  
Old January 25th, 2016, 02:25 PM
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I doubt a different manifold would make any difference. IMO, be very skeptical of any and all performance claims made with modifications to these engines.... Just keep it stock and be happy with the power or move onto a different engine.

The only improvement I would ever try would be TBI.
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  #3  
Old January 25th, 2016, 02:29 PM
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I'm with red.

"Is there a point to trying to find/create a performance exhaust manifold for a 2.5L petrol?"

If you are really "broke AF" then you really shouldn't be entertaining this line of thought.

Buy the cheap mani, save your money.
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  #4  
Old January 25th, 2016, 02:32 PM
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David:
You may be describing engine pre-detonation which mentioned in another thread is very bad and will eventually wreck the engine.
Curious to why this is not something you tried to fix.
You can set the ignition timing with a 12V light bulb during the day and don't even need it at all in night time darkness.
Robert
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Old January 25th, 2016, 02:38 PM
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Quote:
Originally Posted by rdavisinva View Post
David:
You may be describing engine pre-detonation which mentioned in another thread is very bad and will eventually wreck the engine.
Curious to why this is not something you tried to fix.
You can set the ignition timing with a 12V light bulb during the day and don't even need it at all in night time darkness.
Robert
In another thread, he did say he adjusted static timing and idle mixture before this. The problem is elsewhere.

Be interesting to see what is what with the head off....
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Old January 25th, 2016, 02:43 PM
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Quote:
Originally Posted by Red90 View Post
In another thread, he did say he adjusted static timing and idle mixture before this. The problem is elsewhere.

Be interesting to see what is what with the head off....
could be that the engine ran prior for a long time with bad timing. It's hard to tell with these third, fourth or even fifth hand trucks.
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  #7  
Old January 25th, 2016, 02:52 PM
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Quote:
Originally Posted by Red90 View Post
The only improvement I would ever try would be TBI.
Buy the cheap mani, save your money.
Thanks for the input guys, very true. Going with the aftermarket parts and using the extra money for head gasket replacement



Quote:
Originally Posted by Red90 View Post
You can set the ignition timing with a 12V light bulb during the day and don't even need it at all in night time darkness.
I'm super interested in how to do this!



Quote:
Originally Posted by Red90 View Post
Be interesting to see what is what with the head off....
I think I'm just going to suck it up and realize that I'm not going to be able to drive her for a while. I'll clean out a spot in the garage and start tearing apart tonight. Photos to come lol

------ Follow up post added January 25th, 2016 11:58 AM ------

jeez I'm needy... can somebody help me find head studs/bolts? I get everything from RimmerBros usually, they don't have anything listed for the 2.5 Petrol
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  #8  
Old January 25th, 2016, 03:04 PM
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Quote:
Originally Posted by DocB View Post
I'm super interested in how to do this!
Because it has a points ignition, you can set the static timing with a test lead. That method might be in the manual.

It is pretty cheap to change to electronic ignition if you want, but you do lose that ability.

Could not hurt to pull the points base off and see if both advance springs are intact and functional.
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Old January 25th, 2016, 03:04 PM
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Are 2.5 head bolts even stretch? I could have sworn the earlier 2.25 bolts are reusable.
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Old January 25th, 2016, 03:09 PM
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Quote:
Originally Posted by evilfij View Post
Are 2.5 head bolts even stretch? I could have sworn the earlier 2.25 bolts are reusable.
Good point, not sure. It's pretty difficult to find out specs for the 2.5 petrol because it's so similar to the diesel motors a lot of people assume its the same, but it's not all compatible
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Old January 25th, 2016, 03:13 PM
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Quote:
Originally Posted by evilfij View Post
Are 2.5 head bolts even stretch? I could have sworn the earlier 2.25 bolts are reusable.
The manual says "use new bolts", but you are right, they just give a torque and not a stretch procedure.
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  #12  
Old January 25th, 2016, 03:52 PM
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Quote:
Originally Posted by DocB View Post
Good point, not sure. It's pretty difficult to find out specs for the 2.5 petrol because it's so similar to the diesel motors a lot of people assume its the same, but it's not all compatible
For example...
598473 | Exhaust Manifold 4cyl - 4cyl Petrol - Paddock Spares

It's listed for Series 2 & 3 trucks. No product for a 2.5 Petrol in a defender.

------ Follow up post added January 25th, 2016 01:00 PM ------

Quote:
Originally Posted by Red90 View Post
The manual says "use new bolts", but you are right, they just give a torque and not a stretch procedure.
Still cant find a bolt set anywhere!
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  #13  
Old January 25th, 2016, 04:01 PM
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Online part catalog here: Allbrit.de - Ersatzteile für LAND ROVER & MG ROVER

Two possible manifolds.

- Manifold assembly-engine exhaust - conical bore ERC9071 [ 2500 cc - L/R - 4 Cylinder - Petrol ]

- Manifold assembly-engine exhaust - parallel sided bore ETC5330 [ 2500 cc - Petrol ]
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  #14  
Old January 25th, 2016, 04:07 PM
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I'm pretty sure that it's a compatible one. I don't know what the difference would be for a conical or parallel manifold however. I'm going to call Paddock tomorrow and see if they can help out
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