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Mike S.
Dodge Dakota
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11/02/2004
06:03:20
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 Subject: Chain Tensioner Question
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I was wondering what the general opinion is on the timing chain tensioner. Does it steal horse power? It seems too me like it would create drag on the timing chain causing a lose in power. Anyone experience this? When I had my machine work done on my motor last winter the center lines must have moved, I'm looking to fix the loose chain problem this winter. I was told by the machine shop that a stock length chain would be fine but my timing mark on the balancer is moving around about 4 degrees. Would you think the Milodon gear drive is a better choice? Or maybe a undersized chain? The truck sees very little street use, I race bracket on the weekends. Just looking for some opinions because I can't make up my own damn mind. LOL
Mike S.
91CC Carbed 390 w/nitrous
97CC Little 6er
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Bob Lincoln
Dodge Dakota
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11/02/2004
13:20:51
| RE: Chain Tensioner Question
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I just had the dealer replace my original chain with the TSB one. Now I have instantaneous throttle response, great midrange power, lots quieter. I gained power, not lost.
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Mike S.
Dodge Dakota
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11/10/2004
06:11:17
| RE: Chain Tensioner Question
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I was wondering if I could get some more input on this subject. Anyone do a performance rebuild and use the chain tensioner. I got my motor out last weekend, I need to decide what too do.
Thanks guys,
Mike S.
91cc Carbed 390 w/nitrous
97cc 6er
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N56629
Dodge Dakota
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11/10/2004
06:44:35
| RE: Chain Tensioner Question
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Why wouldn't you just replace both the chain and sprockets as long as you have it all apart? It's not only the chain that stretches and wears, it's also the sprockets. There is little point in trying to compensate for sprocket wear by using a tensioner. Wear on the sprocket often accelerates with higher chain tension because many of them are only heat treated just so deep. Try a ProGear 3000 or 4000 from Hughes or look at what Summit has to offer.
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Mike S.
Dodge Dakota
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11/10/2004
12:20:43
| RE: Chain Tensioner Question
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I was planning on replacing the chain and both gears. My problem is the motor only has 2000 miles on it and the chain is loose. When the machine shop done all the work the centerlines of the crank and cam must have moved closer together. My question was would it be a better choice to 1)replace with a new timing set and the chain tensioner? or 2) have the centerlines checked and order a undersized chain? or 3) Get the milodon gear drive?
Thanks again for any input.
Mike S.
91cc Carbed 390 w/nitrous
97cc little 6er
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N56629
Dodge Dakota
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11/10/2004
15:37:54
| RE: Chain Tensioner Question
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I don't see how you could have an "undersized chain." I imagine you could increase the diameter of the rollers and maintain the same pitch, but then it may not match the root of the sprocket. It would be possible to make sets would give you different center to center distances. Adding or removing links makes a huge difference on a chain that short. If they rebored the crank bearings and moved them slightly closer to the cam, although I can't imagine why or being able to move it that much, the only way to get around that would be to use a chain tensioner.
Personally, I would replace the sprockets and chain, then add the chain tensioner if you still think it is too loose.
Hope that answers some of your questions.
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Mike S.
Dodge Dakota
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11/10/2004
16:58:03
| RE: Chain Tensioner Question
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There are several different companies out there that make timing sets in .005 , .010 , and .015 undersized. This is because when machine work is done to the block to align hone the crank and cam centerline those centerlines are made closer together. This is the problem I am having.
Thanks,
Mike S.
91cc Carbed 390 w/nitrous
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N56629
Dodge Dakota
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11/10/2004
18:46:08
| RE: Chain Tensioner Question
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"This is because when machine work is done to the block to align hone the crank and cam centerline those centerlines are made closer together."
I'm not sure why that would be necessary other than to maintain the same diameter. I would think that they could line-bore it and maintain the exact center to center distance. If they didn't, did they give the distance or leave it up to you to figure it out?
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Mike S
Dodge Dakota
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11/10/2004
19:04:42
| RE: Chain Tensioner Question
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I had a lot of machine work done. I had the block clearanced for the 4 inch stroker crank, boring,honing,new freeze plugs, cam bearings, the block zero decked, and the block drilled and tapped for a set of Milodon 4 bolt main caps. I'm guessing the centerlines got out of wack by adding the other than stock main caps. The shop told me to use a standard length chain, so that's what I did. I'm really not that worried about how it got like that now, I was just wanting opinions on the chain tensioner.
Mike S.
91cc Carbed 390 w/nitrous
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Some Help
Dodge Dakota
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11/10/2004
19:42:00
| RE: Chain Tensioner Question
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To get rid of the slack you will need to recheck the center to center measurement of your crank and cam, then contact a couple of the companies that have undersized timing sets for their recomendation. You are correct that when the machining was done it moved your centerlines slightly.
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