Re: Timing chain tensioner
[Re: sonny54]
#2870571
01/07/21 05:37 PM
01/07/21 05:37 PM
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Joined: May 2019
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Sniper
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I Is a timing chain tensioner worth installing. Small block 340. After installing a new roller chain there is still a slight bit of loose. I,m told that is common on some of the engines built back then. 1969. The tensioners I have seen seem to work best on the regular style chain not the roller. True or not true?. Thanking you in advance. the tensioner came about for the chain harmonics seen on the 3.9l V6, which is essentially 3/4 of a 318. Nothing else, which ought not be an issue on the v8's, especially when you consider that Mopar didn't put them on the v8's of the same time frame.
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Re: Timing chain tensioner
[Re: sonny54]
#2870669
01/07/21 08:49 PM
01/07/21 08:49 PM
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Joined: Jun 2012
Posts: 1,899 MYRTLE BEACH SOUTH CAROLINA
ek3
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I Is a timing chain tensioner worth installing. Small block 340. After installing a new roller chain there is still a slight bit of loose. I,m told that is common on some of the engines built back then. 1969. The tensioners I have seen seem to work best on the regular style chain not the roller. True or not true?. Thanking you in advance. prob. good without . they do make chains that are shorter.... usually for line bored blocks....
Last edited by ek3; 01/07/21 08:49 PM.
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Re: Timing chain tensioner
[Re: Sniper]
#2870672
01/07/21 08:50 PM
01/07/21 08:50 PM
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Joined: Sep 2014
Posts: 1,407 Central Pa
moparjim79
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the tensioner came about for the chain harmonics seen on the 3.9l V6, which is essentially 3/4 of a 318. Nothing else, which ought not be an issue on the v8's, especially when you consider that Mopar didn't put them on the v8's of the same time frame. [/quote]
Ok, maybe not the same time frame, but today most if not all modern engines utilize them. I realize mopar v8s have MDS, and perhaps chrysler engineers thought it would be a good additional benefit, or maybe there's more?
And refresh my memory a second, did magnum v8s use tensioners?
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Re: Timing chain tensioner
[Re: moparjim79]
#2870679
01/07/21 08:56 PM
01/07/21 08:56 PM
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Ok, maybe not the same time frame, but today most if not all modern engines utilize them. I realize mopar v8s have MDS, and perhaps chrysler engineers thought it would be a good additional benefit, or maybe there's more?
And refresh my memory a second, did magnum v8s use tensioners?
Most modern engines are OHC and the tensioners are there for the same reason, to control chain/belt harmonics. I guarantee if these modern engine didn't need it, the factory didn't use it. I haven't seen a Magnum use one either. Can you run one? If you want.
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Re: Timing chain tensioner
[Re: sonny54]
#2870713
01/07/21 09:33 PM
01/07/21 09:33 PM
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Joined: Jan 2003
Posts: 31,034 Oregon
AndyF
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I Is a timing chain tensioner worth installing. Small block 340. After installing a new roller chain there is still a slight bit of loose. I,m told that is common on some of the engines built back then. 1969. The tensioners I have seen seem to work best on the regular style chain not the roller. True or not true?. Thanking you in advance. We tried the chain tensioner with a roller chain and the chain destroyed the tensioner fairly quickly. I think they only work with the stock type chain that has a flat smooth backside.
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Re: Timing chain tensioner
[Re: autoxcuda]
#2870870
01/08/21 08:44 AM
01/08/21 08:44 AM
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Mopar SB has one of the longest cam to crank distances of all V-8’s
Makes it tough on timing chains.
I added one to a new build and you could see it on the degree wheel. I suspect that at speed the tensioner's effect on the LA cam timing would be minimal, if anything. It was the nature of the 239's odd crank setup that that cause the cam timing issues they were seeing. rather than come up with an even fire setup they just put in a tensioner to control the feed back from the firing impulses.
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Re: Timing chain tensioner
[Re: Sniper]
#2871226
01/08/21 05:12 PM
01/08/21 05:12 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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To my knowledge, the tensioner was only factory installed on the Magnum engines... NEVER on an LA engine.
I recently built a stroker LA 360, and with the tensioner installed, I caught the site of physical interference of the front SLINGER hitting the lower corner pad of the tensioner. I had to carefully die-grind away about 1/8" from the bottom of the tensioner lower corner pad to have clearance between the SLINGER and the TENSIONER.
NOTE: I later called Hughes Engine, whom I had purchased nearly all the parts for the engine, and described with pictures the interference... I was told, simply, that the TENSIONER was NEVER factory installed on any LA series engines. That kind of disturbed me... because there should have been a warning, or caution, included in the TENSIONER package when installing it... to observe for possible interference with the SLINGER and grind clearance to the TENSIONER lower pad if needed.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: Timing chain tensioner
[Re: Mopar Mitch]
#2871262
01/08/21 06:23 PM
01/08/21 06:23 PM
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Joined: Sep 2014
Posts: 1,407 Central Pa
moparjim79
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To my knowledge, the tensioner was only factory installed on the Magnum engines... NEVER on an LA engine.
I recently built a stroker LA 360, and with the tensioner installed, I caught the site of physical interference of the front SLINGER hitting the lower corner pad of the tensioner. I had to carefully die-grind away about 1/8" from the bottom of the tensioner lower corner pad to have clearance between the SLINGER and the TENSIONER.
NOTE: I later called Hughes Engine, whom I had purchased nearly all the parts for the engine, and described with pictures the interference... I was told, simply, that the TENSIONER was NEVER factory installed on any LA series engines. That kind of disturbed me... because there should have been a warning, or caution, included in the TENSIONER package when installing it... to observe for possible interference with the SLINGER and grind clearance to the TENSIONER lower pad if needed. The package was meant as an upgrade not an add on to the factory assembly. When modifying existing systems, if you think that everything should be a mindless bolt on application, shame on you man. Last time I read, the site exclaims magnum engines and works on LA motors. "Works on"....
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Re: Timing chain tensioner
[Re: moparjim79]
#2871276
01/08/21 06:47 PM
01/08/21 06:47 PM
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Posts: 7,490 Minnesota
Hemi_Joel
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I put one one my 392 early Hemi and it worked fine. I used a double roller chain, and the plastic guides of the tensioner looked like new when I tore the engine down after Drag Week. I was kind of expecting to see some wear, but didn't.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Timing chain tensioner
[Re: moparx]
#2871620
01/09/21 01:59 PM
01/09/21 01:59 PM
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Hemi_Joel
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I put it in there because every time I take a used timing chain out it seems to have so much slop. I wanted to try and get the ignition timing as steady as possible. I'm not sure if the jiggly ignition timing issue is from timing chain flop or not but I figured I'd try it. It seemed to help
Last edited by Hemi_Joel; 01/09/21 02:01 PM.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Timing chain tensioner
[Re: Hemi_Joel]
#2871633
01/09/21 02:13 PM
01/09/21 02:13 PM
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autoxcuda
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I put it in there because every time I take a used timing chain out it seems to have so much slop. I wanted to try and get the ignition timing as steady as possible. I'm not sure if the jiggly ignition timing issue is from timing chain flop or not but I figured I'd try it. It seemed to help Same here. And same results. Like I said, we did degreed the cam with AND without the tensioner... it changed things.
Last edited by autoxcuda; 01/09/21 02:14 PM.
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