Coastcard Posted March 7, 2007 Share Posted March 7, 2007 Just got a 3.9 for my 110 and was planning on using 3.9 exhaust manifolds, 'cos they're better. Does anyone know whether these are the same shape (length and fittings) as the 3.5 ones, so that they will match up to the downpipes and rest of my exhaust. If not, anyone know the solution. Thanks. Quote Link to comment Share on other sites More sharing options...
V8 Freak Posted March 7, 2007 Share Posted March 7, 2007 Just had a 3.9 fitted into my 110 to replace my 3.5.... Same Janspeed manifolds / exhaust pipes, radiator, main loom etc. used and great result.... Nothing moved, all fits & loads more smiles ! Edit: Sorry, mis-read the original post ! Hope my information helped...... Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 7, 2007 Share Posted March 7, 2007 If using 3.9 manifolds you'll need 3.9 down pipes, the 3.5 ones won't match up. I don't know if the 3.9 down pipes will match up with a 3.5 Y-piece though. Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted March 8, 2007 Share Posted March 8, 2007 No 3.9s vs 3.5 are different. the downpipes on a 3.9 are twin port exit from the manifold, the 3.5 are single, and they take a slightly differnt route All non interchangable Nige Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 8, 2007 Share Posted March 8, 2007 Beg to differ - 3.5 EFI and 3.9 (which were all EFI) are the same fitting (two pipes on a 3-bolt flange) but the 3.9's are slightly larger bore, hardly noticeable to the naked eye though and TBH almost certainly not worth the hassle of retro-fitting. In your case you probably won't lose anything by leaving them on but your downpipes will be slightly smaller than the diameter of the manifold outlet, again this is so little difference that it's unlikely to be worth worrying about - remember it's a 2-ton aluminium wardrobe not an F1 car 3.5 carbed have the single pipe I think, Nige is obviously more of a luddite and knows about these clockwork things Quote Link to comment Share on other sites More sharing options...
Coastcard Posted March 8, 2007 Author Share Posted March 8, 2007 Thanks guys. My 110 currently has the standard 3.5 carb exhaust, so it seems from what you are saying I will need manifolds, downpipes and Y piece. Time for some shopping... It was lovely getting the new lump out on the drive in the rain last Sunday. I must say that once we were completely cold and soaked, the labelling of where things attached wasn't quite as diligent as I had intended... So expect a few questions Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted March 8, 2007 Share Posted March 8, 2007 Beg to differ - 3.5 EFI and 3.9 (which were all EFI) are the same fitting (two pipes on a 3-bolt flange) but the 3.9's are slightly larger bore, hardly noticeable to the naked eye though and TBH almost certainly not worth the hassle of retro-fitting. In your case you probably won't lose anything by leaving them on but your downpipes will be slightly smaller than the diameter of the manifold outlet, again this is so little difference that it's unlikely to be worth worrying about - remember it's a 2-ton aluminium wardrobe not an F1 car 3.5 carbed have the single pipe I think, Nige is obviously more of a luddite and knows about these clockwork things One is of course quite right My excuse me lud was I supposed that a 110 had in it a V8 on carbs, and the defendant was placing a 3.9 EFI in its place, as such I advised that 3.5 Carbtootee manifold was single and 3.9EFI PODM (Price of Darkness Model Manifold was twin) Additionally my fingers when typing seemd to be disconnected from my brain Be gentle with me........... Nige Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 8, 2007 Share Posted March 8, 2007 I didn't think anyone still used carbs, don't the science museum have one next to the mechanical computer? Quote Link to comment Share on other sites More sharing options...
Coastcard Posted March 8, 2007 Author Share Posted March 8, 2007 Unfortunately only moving one step up the evolutionary scale from carbs. The 3.9 has the flapper injection with Prinz sequential LPG - hence a few questions coming up, especially as 1) it was running v. rich on fuel before switching, 2) I have some plans Baldrick and 3) as implied in my earlier submission, it looks v. complicated and not sure my labeling is up to it!!! Now, where's the Add Reply lever. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 8, 2007 Share Posted March 8, 2007 IMHO even carp EFi is easier to diagnose than carp carbs, running V rich could be a sensor (coolant or airflow) first thought. Quote Link to comment Share on other sites More sharing options...
Coastcard Posted March 12, 2007 Author Share Posted March 12, 2007 I suspect that I may have identified why the vehicle was running rich. While the engine loom is out, I have had a little investigation. 18 years of engine bay heat has taken its tole and although several insulation cracks there were two obvious shorts, both on the clip on connectors (similar to the injectors) by no.1 cylinder (front n/s). One is a Burgundy colour and one is white. Any flapper fans know what these connect to and whether their shorting would cause it to run rich? Good news is that Autosparks do new looms for about £60 which is a fraction of what it would cost to buy all the connectors, the time to fix. Plus, I would still end up with an old loom with brittle insulation. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted March 12, 2007 Share Posted March 12, 2007 The sensor on the inlet manifold by Cyl 1 is the coolant temp which would indeed make it run rich, the one that goes to the sensor on the fuel rail is fuel temp I believe. Quote Link to comment Share on other sites More sharing options...
Coastcard Posted March 13, 2007 Author Share Posted March 13, 2007 Thanks FF, that will hopefully be a relatively straightforward cure then. Only downer is that the Autosparks engine loom is not the injection one (just alternator, sm, etc.). So now to find a good injection loom... Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted March 13, 2007 Share Posted March 13, 2007 I suspect that I may have identified why the vehicle was running rich. While the engine loom is out, I have had a little investigation. 18 years of engine bay heat has taken its tole and although several insulation cracks there were two obvious shorts, both on the clip on connectors (similar to the injectors) by no.1 cylinder (front n/s). One is a Burgundy colour and one is white.Any flapper fans know what these connect to and whether their shorting would cause it to run rich? Good news is that Autosparks do new looms for about £60 which is a fraction of what it would cost to buy all the connectors, the time to fix. Plus, I would still end up with an old loom with brittle insulation. White is Coolant Temp Sensor Brown is Thermotine sensor Nige Quote Link to comment Share on other sites More sharing options...
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