Re: Undersized timing chain set for a SB mopar
[Re: 412 SB Duster]
#630438
03/04/10 04:03 PM
03/04/10 04:03 PM
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Joined: Jul 2004
Posts: 323 Maryland
Bill_G
enthusiast
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enthusiast
Joined: Jul 2004
Posts: 323
Maryland
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I got an undersized Rollmaster for mine 3-4-5 years ago.
1970 Charger R/T
1970 Dart Swinger 340/4spd
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Re: Undersized timing chain set for a SB mopar
[Re: B3422W5]
#630440
03/04/10 07:48 PM
03/04/10 07:48 PM
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Joined: May 2005
Posts: 1,130 Dayton, Ohio
wldtm
super stock
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super stock
Joined: May 2005
Posts: 1,130
Dayton, Ohio
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small block magnums have one. i used it on my 408. no problems that i know of. justin
Interested in having you car wired? Drag car, street car, EFI swap?
PM for details
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Re: Undersized timing chain set for a SB mopar
[Re: B3422W5]
#630442
03/05/10 12:32 AM
03/05/10 12:32 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Al....put a gear drive on it and be done with it, Milidon makes a real nice one
plus you wont be changing chains all the time, I run a KB gear set up on both of my SB... both of them have been on for a long time(more so with my W-2)
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Re: Undersized timing chain set for a SB mopar
[Re: 412 SB Duster]
#2543995
08/31/18 09:32 PM
08/31/18 09:32 PM
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Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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Does anyone make a undersized timing chain set for a SB mopar?
Or is a tensioner my only choice.
Thanks Al . I had a 408 that had lots of work done to the mains. That work moved the crankshaft up. I opted for a tensioner it was the first time I had ran one I beat the snot out of that motor forever it performed flawlessly.. now I will not assemble a small block Dodge with a chain without using a tensioner.. this was my experience
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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Re: Undersized timing chain set for a SB mopar
[Re: 412 SB Duster]
#2544035
08/31/18 11:23 PM
08/31/18 11:23 PM
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Joined: Oct 2006
Posts: 1,264 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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The way im thinking about this in my miind, i like the idea of a tensioner, but i still think a properly sized chain will keep cam timing in sync with crank /piston position. I would think the flexing of the tensioner would allow for movement on decelleration compared to acceleration. I could be wrong, but this seems possible.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: Undersized timing chain set for a SB mopar
[Re: 412 SB Duster]
#2544196
09/01/18 11:54 AM
09/01/18 11:54 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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Gear drive for a normal cam MUST have an idler, or the cam would turn backward.
Boffin Emeritus
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Re: Undersized timing chain set for a SB mopar
[Re: polyspheric]
#2544223
09/01/18 12:49 PM
09/01/18 12:49 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Yes my gear drive has a idler gear on it.. thats the part thats adjustable(it can move some to take up for a crank being turned down).. love that gear drive set up(this is a single idler gear set up) unlike the dual gear this is quiet on the street EDIT I have a tensioner on my 416 with a chain.. I was concerned about the chain on the tensioner and how it would wear but I have had it apart a few times and that doesnt seem to be a issue.. the most that can happen is the chain will wear down enough so the tensioner will spread out the load and the chain will be on more surface area but it hasnt got down that far.. yet
Last edited by MR_P_BODY; 09/01/18 12:58 PM.
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Re: Undersized timing chain set for a SB mopar
[Re: 412 SB Duster]
#2544347
09/01/18 06:14 PM
09/01/18 06:14 PM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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I read some scary comments about the "dual floating idler" drive, sounds like the self-centering effect causes violent changes in lash and tooth contact. Anyone make a chain drive with an adjustable (not spring loaded) tensioner to avoid the slack loop on decel?
Boffin Emeritus
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Re: Undersized timing chain set for a SB mopar
[Re: polyspheric]
#2544380
09/01/18 08:12 PM
09/01/18 08:12 PM
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Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
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master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
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I read some scary comments about the "dual floating idler" drive, sounds like the self-centering effect causes violent changes in lash and tooth contact. Anyone make a chain drive with an adjustable (not spring loaded) tensioner to avoid the slack loop on decel? chances is if he's got plenty of p2v what happens on decel is not that important.. unless he is talking about. A ton lash in the chain.. if you can take the whip out of the backside of the chain.. usually it will not stretch very much.. most of this stuff is not rocket science nor does it need to be that complicated.. put it together and have fun
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
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