Using a 4.6 crank and con rods with 4.0L pistons - Defender Source
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  #1  
Old March 1st, 2013, 01:09 AM
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Clark Bowen
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Using a 4.6 crank and con rods with 4.0L pistons

Has anyone replaced the crank and con rods in their 4.0L motor with the same items from a 4.6L.
You'd have a 4.6L with higher compression (I've seen estimates that it would be about 10.30 to 1).
I have the 4.6 pistons too, but the head gaskets are fine and the motor only has 3-4,000 miles on a Rob Dassler rebuild so I didn't see any need to pull the heads as long as the 4.0L pistons didn't raise the combustion too high.
Anybody done this?
Thanks
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Old March 1st, 2013, 07:54 AM
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Old March 1st, 2013, 08:12 AM
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I know guys out of Richmond (Va) that have done this several times to good effect. Hit me up via email if you want more details/POC-they're not on here much if at all.

This is likely what I'll be doing with the 4.0 + 4.6 block's I've got waiting in the wings at the moment.
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Old March 1st, 2013, 08:22 AM
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Drew Swoboda has done stuff like this. He's also built 5 liter engines by stroking the 4.6 crank. Will Tillery has a 5.0 stroker in his 130 and it sounds pretty mean.
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Old March 1st, 2013, 08:27 AM
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Drew is one of the RIC guys I was alluding to-Paul L has been my primary interface over time and he's done it in a couple of his trucks if I recall correctly. I know his Red D1 was running that for a significant chunk of miles with no real issues (and a lot of power).
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Old March 1st, 2013, 09:24 AM
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Yeah, Ray, build that toe-stubber into a twin turbo 5.0.
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Old March 1st, 2013, 09:42 AM
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Quote:
Originally Posted by o2batsea View Post
Yeah, Ray, build that toe-stubber into a twin turbo 5.0.
I refuse to do forced induction on a Rover! Other projects will bring me back to my love of boost...but not with the rover v8 as the baseline for that, that's for sure.
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Old March 1st, 2013, 10:29 AM
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Building a 'strong' 4.6 for my D2 at present, buddy has been running one in his D2 for a couple of years without any issues..... pulls hard & is a huge improvement over his old 4L... miles of 's
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Old March 1st, 2013, 11:39 AM
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Landy-Andy....

Did he use the 4.0 pistons or the 4.6 ones?
Evidently the 4.0l pistons raise the compression ratio about a point.
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Old March 1st, 2013, 03:59 PM
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Yes its been done and it works fine. I'm building one here at work for my RRC.
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Old March 1st, 2013, 04:28 PM
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Quote:
Originally Posted by cdb View Post
Landy-Andy....

Did he use the 4.0 pistons or the 4.6 ones?
Evidently the 4.0l pistons raise the compression ratio about a point.
He (and I) are using the 4L pistons.... yup puts the CR up a bit

Once that's into my D2 the 4L will be a donor block for my D90's 4.6 upgrade.... swap that in to replace the 3.9 but keep the V belt front end for simplicity otherwise I'll have to change out all the Megasquirt & EDIS stuff too.
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Old March 1st, 2013, 05:40 PM
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MegaSquirt and EDIS.....

How much difference did they actually make?
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Old March 1st, 2013, 11:30 PM
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Quote:
Originally Posted by Ray_G View Post
Drew is one of the RIC guys I was alluding to-Paul L has been my primary interface over time and he's done it in a couple of his trucks if I recall correctly. I know his Red D1 was running that for a significant chunk of miles with no real issues (and a lot of power).
Yep Drew built Pauls engine in the red disco. Paul has a very clean white disco sitting @ Drews now for some sort of build up.
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Old March 2nd, 2013, 09:03 AM
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Old March 2nd, 2013, 10:01 AM
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Abacus Racing in VA Beach

Abacus Racing in VA Beach builds Rover V8 race engines.
They increase the displacement by using a different connecting rod (Ford or GM ?), piston, and special crank grind.

Because I don't hold any great interest in the V8, don't remember the exact specifics, but think they have a standard setup for increasing the swept volume and maintaining reliability.

They are a friendly bunch and should answer any questions about building a V8 stroker if that's your goal.

Hope this helps.
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Old March 2nd, 2013, 01:45 PM
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Quote:
Originally Posted by rdavisinva View Post
Abacus Racing in VA Beach builds Rover V8 race engines.
They increase the displacement by using a different connecting rod (Ford or GM ?), piston, and special crank grind.

Because I don't hold any great interest in the V8, don't remember the exact specifics, but think they have a standard setup for increasing the swept volume and maintaining reliability.

They are a friendly bunch and should answer any questions about building a V8 stroker if that's your goal.

Hope this helps.
Thanks.... will check them out, maybe a spin-off from using the Buick 300 crank style build as the cranks are getting hard to find these days.
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  #17  
Old October 16th, 2014, 11:28 PM
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what camshafts have you all run with 4.0 pistons in a 4.6? got one at the machine shop now.

I've had great luck with the 50229 camshaft in a 4.6, but I think the dynamic CR will be too high for this combo. Leaning towards 50231 or maybe 50230.
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  #18  
Old October 17th, 2014, 12:04 AM
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I debated this build up when I built my 4.6-- I filled my cylinders with mineral oil and did my Calcs from that-- I know it was darn close to 11:1 compression-- can't recall over/under. Only down side was more restrictions on type/quality of fuel you can use-- you will need to run higher octane. I choose dialing it back a hair to use any fuel in case I had to borrow, but I was truly on the fence. I'll look up my notes. To do another engine, I probably would do that.... Haven't borrowed fuel in years...
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  #19  
Old October 17th, 2014, 12:23 AM
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Using a 4.6 crank and con rods with 4.0L pistons

What do you mean you dialed it back a hair? Is that stock 4.6 23cc pistons, or something custom? And what cam? And what's higher than the premium already required per the owners manual?
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Old October 17th, 2014, 08:13 AM
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Quote:
Originally Posted by Uncle Douglas View Post
Yep Drew built Pauls engine in the red disco. Paul has a very clean white disco sitting @ Drews now for some sort of build up.
Paul was telling me about his next build on the trails at MAR. 100" Defender on 37's.
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