Here's your 4.0 & 4.6 camshaft spec c...

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Author Message   Randall Smith (Mr_smith) Member Username: Mr_smith Post Number: 247 Registered: 04-2003 Posted on Wednesday, March 24, 2004 - 11:07 pm:    These are the specifications on the cams for the Rover distributorless engines. I think these may be the only two available off the shelf cams for these engines. 4.0: Intake and exhaust lift .403 Duration @ .004, intake 262, exhaust 266 IO 19-BTDC, IC 63-ABDC EO 58-BBDC, EC 28-ATDC Duration @ .050, intake 193, exhaust 193 IO (12)-ATDC, IC 25-ABDC, lobe center ~106 EO 25-BBDC, EC (12)-BTDC, lobe center ~108 4.6: Intake and exhaust lift .424 Duration @ .004, intake 269, exhaust 274 IO 14-BTDC, IC 75-ABDC EO 68-BBDC, EC 26-ATDC Duration @ .050, intake 205, exhaust 206 IO (12)-ATDC, IC 37-ABDC, lobe center ~111 EO 38-BBDC, EC (12)-BTDC, lobe center ~115 Based on the specs above I would say that the 4.0 cam would be very conservative grind. Less fuel consumed and longer valve train life. I would say that the 4.6 cam is a little peppier, but still has a very smooth idle. Better grind for highway speeds. Randall   Ron Brown (Ron) Senior Member Username: Ron Post Number: 814 Registered: 04-2001 Posted on Thursday, March 25, 2004 - 03:21 pm:    Do you think there would be any issue putting a 4.6 cam in a 4.0?   Sandy Deke (Disco_deke) New Member Username: Disco_deke Post Number: 21 Registered: 02-2004 Posted on Thursday, March 25, 2004 - 03:38 pm:    I have a brand new stock 4.6 cam shaft I'd be willing to sell cheap, if anyone's interested.   Sandy Deke (Disco_deke) New Member Username: Disco_deke Post Number: 22 Registered: 02-2004 Posted on Thursday, March 25, 2004 - 03:50 pm:    I also have the stock 4.6 timing chain & gears and I think I still have the oil pick up tube. All brand new condition.   Kyle Van Tassel (Kyle) Moderator Username: Kyle Post Number: 913 Registered: 11-2002 Posted on Thursday, March 25, 2004 - 04:01 pm:    I am thinking the 4.6 cam will wind up a little tighter in the 4.0 but will drop the compression slightly.... Nice duration but thats an iffy swap on a stock motor.... Real iffy..   Sandy Deke (Disco_deke) New Member Username: Disco_deke Post Number: 23 Registered: 02-2004 Posted on Thursday, March 25, 2004 - 11:05 pm:    Well, you never know 'til you try. Could be the greatest thing since sliced bread, putting a 4.6 cam in a 4.0. Anyway, I'd sell the stock 4.6 camshaft, timing chain, timing gears and the oil pick up tube all for $200.00 including shipping. These are all in brand new condition. That's less than half what AB or the dealer would charge.   Sandy Deke (Disco_deke) New Member Username: Disco_deke Post Number: 24 Registered: 02-2004 Posted on Saturday, March 27, 2004 - 06:40 pm:    It'd be interesting to see how the Piper cams' specs compare to the stock 4.0 and 4.6 cams, although I don't see a Land Rover cam on Piper's website. Is RPi the exclusive source for Piper's LR cams? I've got an RP4 cam that came on my 4.6 w/distributor, but don't know if Piper makes any for the GEMS motors.