rover engines and horsepower - Defender Source
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View Poll Results: re-power whats your choice?
4.6 short block with cam rebuilt heads...... 11 61.11%
2.8 PS 7 38.89%
Voters: 18. You may not vote on this poll

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  #1  
Old November 15th, 2006, 09:03 AM
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rover engines and horsepower

Would 230 or 250 be hard to get out of a 3.9 and still keep it fairly reliable and efficient. Or is the only way to really see an improvement the 4.6 block etc.. Who has put a cam in a 3.9? Are there any guys in NC that have put in a 4.6 or tweaked a 3.9 on this BB? Other than the cross bolting on the 4.2 why do they get no love? Plenty of RR's with 150k+ on them still knocking a long

2.8 or 4.6? Either way i dont see much bad in either power plant. But realistically I think a 4.6 would be just as much entertainment as the 2.8




All this being said i feel sorry for the guys with 110's and the 3.9.
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  #2  
Old November 15th, 2006, 10:57 AM
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Quote:
Originally Posted by rover4x4
All this being said i feel sorry for the guys with 110's and the 3.9.
Yeah, thanks! The phrase "Stop and smell the roses" has a lot more meaning once you've driven a 110 with a 3.9 in the mountains... A 4.6 is definitely on my to do list one of these years.
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  #3  
Old November 15th, 2006, 12:27 PM
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Yah no kidding. Last year while driving to the Ronald Reagan library in Simi Valley, I was trying to follow someone's audi A4 up a hill...........they had to wait on the shoulder for me heh. I just changed a water pump on it at 70k and I think I'll drive it around with the 3.9 for awhile til I find a better power plant for it. I just bought a new and used 4.0 (the new is going in my 90) and I'd like to biuld on the 4.0 with 4.6 internals if this is possible.


Neil
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Old November 15th, 2006, 07:30 PM
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You can always put a Buick 300 crank into a 3.9 and punch it out to a 4.8.
Then there are the normal engine dohickeys such as cam, head porting, etc...

www.aluminumv8.com

-Hans
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  #5  
Old November 15th, 2006, 07:58 PM
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Quote:
Originally Posted by Hans
You can always put a Buick 300 crank into a 3.9 and punch it out to a 4.8.
Then there are the normal engine dohickeys such as cam, head porting, etc...

www.aluminumv8.com

-Hans

Couldn't I do the same exact thing on a 4.0? I thought the 4.0 is a better block with better casting and thus would benefit much better from a mod such as a buick 300 crank.

Neil
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  #6  
Old November 15th, 2006, 08:03 PM
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Have you thought about bolting a leaf blower. Might gain something there
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Old November 15th, 2006, 08:09 PM
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Originally Posted by TwisteD90
Have you thought about bolting a leaf blower. Might gain something there
Bolting it to where, to the intake plenum or to the roofrack? where could I find good 2 stroke oil and what weight? Thanks


neil
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  #8  
Old November 15th, 2006, 10:31 PM
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The 4.0 crankshaft main bearings are larger in diameter than a 3.9 so you can't put the Buick crank in the 4.0 block.

However I was looking at one of the new Chevy LT-1? aluminum small block V-8's out of a newer Corvette the other day - the one with the extra high camshaft location - and I was thinking that it sure looked like it would fit where a Rover V-8 fits - 6.5 liters and over 325 hp - now that could be interesting.
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Old November 16th, 2006, 01:05 PM
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I just found out that I got a 3.9 in my 90 that I'm going to pull out sometime, its in good condition, I'm only doing it to hone my engine biulding skills with this 4.0 I just bought. So I'm looking at D&D's site and I see that 300 crank your talking about Hans. Do the cylinders/sleeves have to be resized to get to 4.8? Could I simply buy the right bearings I need from D&D and biuld the thing myself after the machine shop work? Can I leave the heads and intake plenum alone with a 4.8 biuld up or would that need modifications like RPI's big valve heads? I think I got a fever..........and the only cure is more displacement. :D Thanks


Neil
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  #10  
Old November 16th, 2006, 02:00 PM
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If you do the 300 crank I believe you will have to do the flywheel as well which raises its own issues. I have RPI's stage II heads on my 4.6. I think the biggest help is over 3000rpm. Seems to breathe alot better.

my .02
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  #11  
Old November 16th, 2006, 02:23 PM
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Well I just got off the phone with someone at D&D. They say its just not worth turning a 3.9 or 4.0 block to a 300 stroker. Apparently it'll cost too much money for what you can get out of a 4.6. Plus they said all the ancilliaries line up better on the 4.6, whereas everything will change when you get the right heads. I told them I'd be doing this for a D90 and they said its not worth the money, and told me to bo buy a 4.6 block and start from there. I think I might just sell my used 4.0 block to someone else and wait for a 4.6 sale someday. Thanks for the advice everyone.

Neil
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Old November 16th, 2006, 03:11 PM
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Buy yourself an old dog Series and then every time you get back in the Defender, it'll feel lightning fast---I think my SIII is pushing out 60-65 neck-snappin' HP !!
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Old November 16th, 2006, 04:08 PM
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Quote:
Originally Posted by Nomar
Buy yourself an old dog Series and then every time you get back in the Defender, it'll feel lightning fast---I think my SIII is pushing out 60-65 neck-snappin' HP !!
I have 3 series vehicles so I know all about slow. My daily driver is a 73' SIII and I've put every aftermarket engine mod so far...rochester, pertronix igntion, coil etc. I mean its ok for speed, I can do 70, but I'm driving daily on the Hollywood 101 Fwy. 6 days a week twice a day. I don't know how I do it, people who pass me give me weird or dirty looks. I just mind my own business and think of how my defender is faster but less fuel efficient. Someday i'd like to find a donar series, gut the weight, make a lightweight fiberglass body and stick in a toyota 4cylinder and auto trans and get rid of the 4x4 setup. This way It would have the series look but would actually be set up for fwy and city driving. I'm sure it wouldn't cost that much either if you keep it simple.


neil
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