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Advancing cam on 6.1?
#2457838
02/26/18 01:16 PM
02/26/18 01:16 PM
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Joined: Sep 2004
Posts: 523 Right here
HP2
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OP
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I'm replacing bearings, crank and some rods on a 6.1 Hemi. I bought the engine with a spun rod bearing. I will put it in a 1971 Sport Fury and use a A518 overdrive and 3.91. I will run it all stock except for induction and exhaust and will probably use a MegaSquirt MS3 Gold Hemi controller. My Sport Fury will serve as a fun daily driver and I was thinking to lower the power band some by advancing the cam a little. Anyone done this on a 6.1? I would like some input on this. Thanks!
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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Re: Advancing cam on 6.1?
[Re: HP2]
#2459381
03/01/18 01:56 PM
03/01/18 01:56 PM
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Joined: Jan 2008
Posts: 4,255 Canada
WO23Coronet
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I think it’s a good idea. I know the recommendation when putting a 6.1 cam in a 5.7 is to advance it 8 degrees (from the factory installed centerline, not from the LSA). I believe the 6.1 cam has an LSA of 117 and has an ICL of 119 or 121 (I’ve seen both published) so it’s actuall 2-4 degrees retarded (I believe for purely emissions reasons). Seems most mild engines respond with advancing the cam in the 4 degree range so put in in at 113. I’m doing a 6.1 cam into my Ram and that’s where I’m going to install it. I say go for it
Last edited by WO23Coronet; 03/01/18 03:02 PM.
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Re: Advancing cam on 6.1?
[Re: WO23Coronet]
#2460323
03/03/18 02:25 AM
03/03/18 02:25 AM
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Joined: Nov 2003
Posts: 1,881 Pittsburgh,PA
RTSrunner
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I think it’s a good idea. I know the recommendation when putting a 6.1 cam in a 5.7 is to advance it 8 degrees (from the factory installed centerline, not from the LSA). I believe the 6.1 cam has an LSA of 117 and has an ICL of 119 or 121 (I’ve seen both published) so it’s actuall 2-4 degrees retarded (I believe for purely emissions reasons). Seems most mild engines respond with advancing the cam in the 4 degree range so put in in at 113. I’m doing a 6.1 cam into my Ram and that’s where I’m going to install it. I say go for it WO23,What engine is in your Ram a 6.1 or 5.7 & what year truck?
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Re: Advancing cam on 6.1?
[Re: WO23Coronet]
#2460940
03/04/18 03:48 PM
03/04/18 03:48 PM
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Joined: Sep 2004
Posts: 523 Right here
HP2
OP
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OP
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I think it’s a good idea. I know the recommendation when putting a 6.1 cam in a 5.7 is to advance it 8 degrees (from the factory installed centerline, not from the LSA). I believe the 6.1 cam has an LSA of 117 and has an ICL of 119 or 121 (I’ve seen both published) so it’s actuall 2-4 degrees retarded (I believe for purely emissions reasons). Seems most mild engines respond with advancing the cam in the 4 degree range so put in in at 113. I’m doing a 6.1 cam into my Ram and that’s where I’m going to install it. I say go for it Good to hear other people are thinking the same. Compression pressure will be a little higher but with good gas quality and octane I don't think there will be any problem.
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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Re: Advancing cam on 6.1?
[Re: ric3xrt]
#2460942
03/04/18 03:50 PM
03/04/18 03:50 PM
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Joined: Sep 2004
Posts: 523 Right here
HP2
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How did you do it? I was thinking to modify the original parts but there might be someone who makes adjustable gears?
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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Re: Advancing cam on 6.1?
[Re: WO23Coronet]
#2461228
03/04/18 11:56 PM
03/04/18 11:56 PM
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Joined: Nov 2003
Posts: 1,881 Pittsburgh,PA
RTSrunner
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My Ram is an 05 with a 5.7. There’s adjustable sets that you can get, although I haven’t bought one yet I have Comp Cams adjustable timing set and 6.1 length pushrods to put in my 5.7.I bought a brand new Chrysler crate engine that a Chrysler tech owned and put a 6.1 cam in but did not advance the timing or change pushrods.This is an older engine but brand new,I think he installed the cam before it was known to advance it a few degrees.This engine is for my 2004 Durango that snapped a connecting rod & ruined the original block. So you are thinking install it @ 113* in the 5.7,I'll have to see what I can get it at with the Comp adjustable set. Thanks RT
Last edited by RTSrunner; 03/04/18 11:57 PM.
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Re: Advancing cam on 6.1?
[Re: HP2]
#2462718
03/07/18 06:50 PM
03/07/18 06:50 PM
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Joined: Sep 2004
Posts: 523 Right here
HP2
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I found it to be worth to order a new adjustable timing gear set from Comp instead of hassling with the old set.
70 W100 Power Wagon. 318 4-spd 70 Sport Fury 440 2dr HT 71 Duster 340 71 Charger Super Bee - 383/727 72 Charger "Sabotage" - 440/727 - Street/Strip 78 Warlock in beautiful patina
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