NickSuzy Posted October 9, 2007 Share Posted October 9, 2007 Afternoon everyone, I have just got my hands on a good 4.6 V8 engine from a P38. It does not use any water or such like and wanted to know what sort of work was needed to put it into my classic. Any advise would be greatly appreciated. Cheers Nick Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted October 9, 2007 Share Posted October 9, 2007 Afternoon everyone, I have just got my hands on a good 4.6 V8 engine from a P38. It does not use any water or such like and wanted to know what sort of work was needed to put it into my classic. Any advise would be greatly appreciated. Cheers Nick Nick I would think that you will retain all the injection and exhaust manifolds from your current car together with the alternator and air con if relevant. It should therefore be a simple case of unbolting one and bolting the new one in its place. Have you done an engine swap before? That is all you should be doing here the fact that one is either a 3.5 or a 3.9 and the new one is a 4.6 should be irrelevant beacuae they are both Range Rover V8. I once put a Rover SD1 V8 engine in a RR that required changes to the bracketry and the water pump but would not think that will be the case here. Quote Link to comment Share on other sites More sharing options...
NickSuzy Posted October 9, 2007 Author Share Posted October 9, 2007 Hi There I have done a few engine swaps in my time, is the 4.6 block the same as the 3.9 then, would be nice if it is, that would make it a very simple swap. Cheers Nick Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted October 9, 2007 Share Posted October 9, 2007 Yes the block is identical, but depending on the age of the 4.6 the ancillary mounting bracket points on the heads may differ …………. also late RV8 engines are serpentine (poly multi V) ancillary drive and the earlier engines are single V belts ………….. If its like for like then you will be OK ……………..i.e if both are pre 94/95 then fine. Ian Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted October 9, 2007 Share Posted October 9, 2007 Yes the block is identical, but depending on the age of the 4.6 the ancillary mounting bracket points on the heads may differ …………. also late RV8 engines are serpentine (poly multi V) ancillary drive and the earlier engines are single V belts …………..If its like for like then you will be OK ……………..i.e if both are pre 94/95 then fine. Ian BBC Surely if you strip back to the bare block the mounting will be the same as the casting never changed. The difference between the SD1 and the RR was related to bolt on components line timing covers, alternator brakets etc. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 9, 2007 Share Posted October 9, 2007 The 4.6 will have a longer crank nose, to bolt a non-serpentine front on you'll need a ~20mm spacer ring behind the crank pulley bolt to get it to tighten up. My 4.6 has a 3.5 V-belt front end and 3.9 inlet manifold and EFi. The block isn't exactly the same as a 3.9 - it's cross-bolted, so if you have a remote filter replacement oil pump cover it will foul the cross-bolt (ask me how I know) apart from that - drop it in. What are you doing for fuelling? Quote Link to comment Share on other sites More sharing options...
NickSuzy Posted October 10, 2007 Author Share Posted October 10, 2007 Morning Everyone, Right my RRC is a 1990 3.9 while the engine i have got is from a 1995 P38, it does not have the serpentine belt arrangement. Fuelling i am going to put LPG on it but i take it i will have to upgrade the fuel pump as well. Cheers Nick Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 10, 2007 Share Posted October 10, 2007 Fuelling i am going to put LPG on it but i take it i will have to upgrade the fuel pump as well. Not fuel pump, fuel injection. You might "get away" with it using the 3.9 hotwire system, but I wouldn't trust it on my engine. Then again, I don't trust anything with a Lucas sticker on it Quote Link to comment Share on other sites More sharing options...
NickSuzy Posted October 10, 2007 Author Share Posted October 10, 2007 Not fuel pump, fuel injection. You might "get away" with it using the 3.9 hotwire system, but I wouldn't trust it on my engine. Then again, I don't trust anything with a Lucas sticker on it Hi FridgeFreezer, Right then, what choices do i have: Please explain Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 10, 2007 Share Posted October 10, 2007 As I said, you may be able to get away with the hotwire system (before people tell me I'm being picky) however I would recommend MegaSquirt so you can tune it properly and keep an eye on things - a popular theory for the 4.6 liner slip/porus block problem is the lean cruise fuel map Rover run on them, hence why I would be wary of using a less-than-ideal setup on a 4.6. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 11, 2007 Share Posted October 11, 2007 Morning Everyone, Right my RRC is a 1990 3.9 while the engine i have got is from a 1995 P38, it does not have the serpentine belt arrangement. Fuelling i am going to put LPG on it but i take it i will have to upgrade the fuel pump as well. Cheers Nick V8s have lots of tweaks mods and bits through the range that LOOK the same - until you do the mix n match when you go to assemble A 4.6 Block has variants, is yours a serp crank or std. Then dependant on this it will give you a guide as to what you can fit, and as you have a 3.9 donor, again what EXACTLY is the spec, this will then give an idea of poss probs. Also, what exhuast manifolds have you got, and is what it is going into std ?..ie rad cowling water pump viscous etc ? Then the issue of getting it to run. A HW 3.9 system will NOT run a 3.9 without tweaks, the 3.9 ECU is not adjustable or reprogrammable so a EPROM from Mark Adams is one option, and he will then remap the fuel map for the ECU and tweak for you - Not exactly cheap Megasquirt is a real option, if I can do it with the help of FF BBC and others - mnay on this forum - anyone can Get a dmaned good look at both engines, and consider the options BEFORE you start, work out EXACTLY what you will need - or you will do a huge amount of screaming,. Lastly if your using the top end of the 3.9 what the internal condition like ?. If its high mileage and not spotless, then pulling it apart for donor bits just makes things get more complicated - take apart to clean ..............then maybe valve guides.... re lapping... rocker shafts... pushrods...., cam shaft.... rockers.... Followers..... timing gears chain.... etc etc etc etc Nige Quote Link to comment Share on other sites More sharing options...
Dunc Posted October 17, 2007 Share Posted October 17, 2007 4.6 in a Classic... That's my idea of porn. Wonderful. Quote Link to comment Share on other sites More sharing options...
q-rover Posted October 17, 2007 Share Posted October 17, 2007 I had a RRC with a 4.6 . It was brilliant, loads of torque. I simply had the tired 3.9 rebuilt to 4.6 and had top hat liners put in. Even with 235.85 tyres and standard gearing is was quick of the mark. Fuel consumtion was good aswell, tottling along commuter style I got about 17mpg. The best i got on a long run was 21.6mpg. That included driving up 7 Km long tunnels with a 9% incline at 120Km/h in 3rd. Sadly the car died when a lorry hit it in the rear. Quote Link to comment Share on other sites More sharing options...
tinker Posted November 9, 2014 Share Posted November 9, 2014 Here we go again...I'm thinking of putting my 4.6 out of my p38, it rebuilt with top hat liners, big valve heads, adjustable pushrods, fast road can and some other nice bits, so let's talk fueling, I'm going to run LPG as its my daily, I think I will have to have a word with Mr megasquirt, also anybody know of anyone yo put the 4.6 auto internals into my classic box Ta very much Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted November 10, 2014 Share Posted November 10, 2014 Ashcroft do hp24 internals in an hp22 casing... Give them a ring, just sit down first Quote Link to comment Share on other sites More sharing options...
g&t Posted November 10, 2014 Share Posted November 10, 2014 I think q-rover had the right idea with his top-hats NickSusy bearing in mind that, historically, the 4.6 seems to suffer the most from slipped liners, though installing one in the lighter Classic might help the reliability. Quote Link to comment Share on other sites More sharing options...
tinker Posted November 10, 2014 Share Posted November 10, 2014 Cheers Bowie69!! I had figured they would, and also know how to charge for it... Quote Link to comment Share on other sites More sharing options...
Rangy35 Posted February 10, 2015 Share Posted February 10, 2015 How much for the gearbox mod in UK, I just had mine done here in OZ me and a mate with plenty ZF experiance, with buying the doner box and every single moving part brand new geniune ZF parts $4000.00. Yes I know it alot but to me its so wurth it. Quote Link to comment Share on other sites More sharing options...
Cheesy Posted February 11, 2015 Share Posted February 11, 2015 Just kidding, its only a 4.6 throttle body, it is close though at 4.5l Quote Link to comment Share on other sites More sharing options...
iomlt Posted February 11, 2015 Share Posted February 11, 2015 I have a hot wire ecu with tornado chip in, all fuelled for 4.6 going fairly cheap if that helps you pm me Quote Link to comment Share on other sites More sharing options...
Rangy35 Posted February 12, 2015 Share Posted February 12, 2015 My Classic's 4.6 is waiting to be rebuild before I fit it, searching for the right internals. Quote Link to comment Share on other sites More sharing options...
task Posted February 17, 2015 Share Posted February 17, 2015 You can now also re-map the 14CUX fairly easily if you so wish; http://www.stevesprint.com/remap-14cux/ Quote Link to comment Share on other sites More sharing options...
wamba Posted May 5, 2015 Share Posted May 5, 2015 I have a hot wire ecu with tornado chip in, all fuelled for 4.6 going fairly cheap if that helps you pm me if you still have the ecu please pm me. Quote Link to comment Share on other sites More sharing options...
Cookee Posted May 23, 2015 Share Posted May 23, 2015 if you still have the ecu please pm me. And if Wamba doesn't have it I might be interested! Thanks! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.