The Start of Something Bigger (4.6) - Defender Source
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  #1  
Old March 29th, 2014, 11:25 AM
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The Start of Something Bigger (4.6)

I've been feeling the 4.6L itch for a while, and Jimmy (Jymmiejamz) finally helped push me over the edge.

The plan:
4.6 block
4.6 crankshaft
4.0 pistons
Crower stage 2 cam
Jet Hot coated exhaust manifolds
Magnaflow y-pipe
Mark Adams Tornado chip
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  #2  
Old March 29th, 2014, 04:47 PM
The Dro
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I like what he did with the plenum.

If I ever go the 4.6L route again... I'll copy his idea.
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  #3  
Old March 29th, 2014, 04:50 PM
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Quote:
Originally Posted by The Dro View Post
I like what he did with the plenum.

If I ever go the 4.6L route again... I'll copy his idea.
And whats that??

I am going 4.0 to 4.6 in my 1997 as we speak.
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  #4  
Old March 29th, 2014, 05:19 PM
The Dro
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Quote:
Originally Posted by KKilo23 View Post

And whats that??

I am going 4.0 to 4.6 in my 1997 as we speak.
It's just Rover Porn...

He polished the top part and added a Land Rover logo where the 4.6L was.
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  #5  
Old March 29th, 2014, 07:21 PM
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Amit Likhyani
95 D90 Soft Top Estoril Blue 6.2 LS
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Doing the same thing. I bought a 4.6 from a 2003 Discovery and I'm using those pistons. I am working with aluminum v8. Bought the T cylinder liners, crower cam, hot coil and distributor, bolt kit, chain. I have the Maganflow y-pipe. I also bought the headman headers and they aren't going to bolt right up to the y-pipe. What do people recommend? Should I sell the y-pipe and have a muffler shop start over from the headers back? Should I sell the headers and just use the OEM manifolds? Or is there something else I should consider?
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  #6  
Old March 29th, 2014, 07:32 PM
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Cha...wannabe D90 racers! wait until my 5.2 goes in...when I die from 360 HP in a D90 it will be because I was able to exceed 85 mph uphill!
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  #7  
Old April 3rd, 2014, 10:55 PM
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Quote:
Originally Posted by blaughva View Post
I've been feeling the 4.6L itch for a while, and Jimmy (Jymmiejamz) finally helped push me over the edge.

The plan:
4.6 block
4.6 crankshaft
4.0 pistons
Crower stage 2 cam
Jet Hot coated exhaust manifolds
Magnaflow y-pipe
Mark Adams Tornado chip

Which one is the stage 2? I did the 50229 in mine with 4.6 pistons. I really think a stock 4.6 cam grind would be better with 4.0 pistons. If you go by dynamic compression ratio the cylinder pressures will be huge compared to stock with a reasonable crower cam and 4.0 pistons. The 4.6 cam has a lazy intake closing angle that would bring the dynamic compression ratio with 4.0 pistons similar to stock at low RPM and a much larger power band. I'd be worried about detonation with a 50229 or 50230
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  #8  
Old April 3rd, 2014, 10:58 PM
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How did I miss this thread previously? Subscribed. When do we start the motor pull ?
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  #9  
Old April 4th, 2014, 12:05 AM
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How many HP will it have?

What are you going to do to prevent slipped cylinder liners?
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Past Land Rovers: '96 Discovery SD, '00 Range Rover HSE, '04 Discovery SE7, '07 Range Rover HSE, '08 LR3 SE7.
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  #10  
Old April 4th, 2014, 08:38 AM
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We're going to build the engine mostly complete so it will be a quick swap. That way we can clean and paint everything without having the truck apart for weeks. It takes a long time to paint all of the pieces of the motor. Fortunately, between my co worker Drew and I, we have enough pieces to build the motor without using most of his existing stuff.

This is what Pedro is talking about on my plenum. I can't take credit for this since Drew came up with the idea and and gave me that intake to put on this motor for my RRC. I love the way it looks, and its way cheaper than a 4.6 plenum.



Since a 14CUX plenum is not flat we're going to do something different. I'd like to have the 3.9 machined off of it, and will probably paint it like my D90's motor (PO painted it).

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  #11  
Old April 4th, 2014, 06:47 PM
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Amit Likhyani
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Please let me know what you end up doing to your plenum. I definitely want to grind off the 3.9 and maybe have a plate made that says 4.6. I'll polish the plenum too while it's off. Open to other ideas as well obviously.
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  #12  
Old April 29th, 2014, 12:08 PM
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Jet Hot coated valve covers and exhaust manifolds are in and looking great!
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  #13  
Old May 23rd, 2014, 09:47 AM
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More progress... New cadmium plating on the fuel rail. Block and crank back from the machine shop.
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  #14  
Old May 23rd, 2014, 09:58 AM
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#roverporn looks amazing
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  #15  
Old May 27th, 2014, 06:02 PM
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Very nice, digging the plenum.
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  #16  
Old May 27th, 2014, 10:05 PM
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Quote:
Originally Posted by rover4x4 View Post
Very nice, digging the plenum.
Which one? Neither of them are going on Brad's, but I've had the 3.9 machined off of a 14CUX plenum. I'm working on the rest of the motor, so the plenum is kind of the last this I'm worried about at the moment. I'll be getting the truck on thursday, so there should be a lot of updates from now on!
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  #17  
Old May 30th, 2014, 07:29 PM
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Coming together...





Note: The sandblaster is not being used with the engine in the building.
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  #18  
Old May 30th, 2014, 08:36 PM
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Did you consider headers?
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  #19  
Old May 30th, 2014, 10:08 PM
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Quote:
Originally Posted by RoverDude View Post
Did you consider headers?
No. In the limited experience I have with aftermarket headers, they never fit properly. The factory manifolds work fine, and this motor will have plenty of power without headers.
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  #20  
Old May 31st, 2014, 12:45 AM
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i like the "shaved" plenum.
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