| Double roller or single roller timing chain? [message #356281] |
Wed, 01 July 2020 06:56  |
6cuda6
Messages: 975
Registered: June 2019
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From my racing days we were always told when replacing a timing chain to go double roller.....having very little experience with RV motors, what is the recommended? Single or double roller?
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Double roller or single roller timing chain? [message #356283 is a reply to message #356282] |
Wed, 01 July 2020 07:37  |
6cuda6
Messages: 975
Registered: June 2019
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Thanks Wally....double it will be.
wally wrote on Wed, 01 July 2020 08:086cuda6 wrote on Wed, 01 July 2020 06:56From my racing days we were always told when replacing a timing chain to go double roller.....having very little experience with RV motors, what is the recommended? Single or double roller?
We installed a double roller in 2006, it's still going..
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: Double roller or single roller timing chain? [message #356284 is a reply to message #356281] |
Wed, 01 July 2020 07:38 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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If there is a downside to a double roller setup other than it costs a bit more, I'm not aware of it - Gurus?
The upsides are less wear on chain and sprockets so longer life, and as I understand it a bit less load. Either way I've always used the double roller.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Double roller or single roller timing chain? [message #356288 is a reply to message #356281] |
Wed, 01 July 2020 09:28 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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As stated before, the downside to a roller chain is the cost. If you are replacing the timing set on a high mileage engine, that will probably need an overhaul/rebuild in 40 - 50,000 miles, you might just save the money and install a standard timing set since you will be replacing it well before it wears out anyway.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Double roller or single roller timing chain? [message #356289 is a reply to message #356284] |
Wed, 01 July 2020 09:08 |
powwerjon
Messages: 849
Registered: March 2013
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Johnny,
Since I have been doing GMC’ing since August of 1998 the subject of replacement cam chain set has be discussed a multitude of times with varying opinions.
Your original factory cam drive set had a nylon teeth on the camshaft end and that is what wore out. The standard expression was that if you had 140K+ miles one your motor you should consider replacing the less it fails and really do some damage.
As far back as when we bought our coach and before that the replacement cam gear/chain set was alway the Cloyes True Roller Time Chain Set. It has gone up in price over the last 10 years or so.
https://www.jegs.com/i/Cloyes/220/9-3113.010/10002/-1
The Lunati set up is some what less.
https://www.summitracing.com/parts/lun-93113
There are a number of clones available out on Ebay, but be VERY CARFUL!! You can probably find a double for the 330 thru 455 engine family at your local parts supplier.
J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan
> On Jul 1, 2020, at 8:38 AM, Johnny Bridges via Gmclist wrote:
>
> If there is a downside to a double roller setup other than it costs a bit more, I'm not aware of it - Gurus?
> The upsides are less wear on chain and sprockets so longer life, and as I understand it a bit less load. Either way I've always used the double
> roller.
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me in hell
>
>
> _______________________________________________
> GMCnet mailing list
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| Re: Double roller or single roller timing chain? [message #356345 is a reply to message #356281] |
Wed, 01 July 2020 23:16 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
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If my memory is correct. When I did my timing chain. Could not find a single roller chain anywhere to buy if I had wanted to. Think they were listed, but no one had available.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Double roller or single roller timing chain? [message #356369 is a reply to message #356281] |
Thu, 02 July 2020 15:26 |
kingd
Messages: 592
Registered: June 2004
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I have a quesstion about "CAM CHAINS" I understand there are at least 2 basic types, Hyvo chains
and roller chains. Simply what is the difference between a "single" roller chain and a "double"
roller chain, The pictures I think I see of chains I don't understand why some are called single
and some are called double. I would have guessed a "double" would have had 3 rows of plates.
Just checked again. found some pictures of "double" roller chains and they DO have 3 rows of plates.
I guess I may have answered my own question. Am I correct ?
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
[Updated on: Thu, 02 July 2020 15:30] Report message to a moderator |
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| Re: [GMCnet] Double roller or single roller timing chain? [message #356384 is a reply to message #356308] |
Fri, 03 July 2020 12:29 |
Richard Denney
Messages: 920
Registered: April 2010
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I think I paid less than a hundred bucks for the Cloyes double-roller set,
when I changed them from stock on my previous set. That’s, what, $40 more
than the cheapest metal replacements? That’s down in the noise.
Rick “cheap insurance” Denney
On Wed, Jul 1, 2020 at 3:55 PM Bob Dunahugh via Gmclist <
gmclist@list.gmcnet.org> wrote:
> There is a double roller chain. Never a single for our GMC's. The
> original GM chain wasn't a roller chain at all. I'm drawing a blank on
> what's it's called. Matt, and Carol have good points. The problem with the
> original GM timing set. Is that the plastic on the cam gear is getting
> old/brittle. The double roller was developed for engines that run at high
> RPM's. And engines that have high valve spring pressures. That's it.
> There's no real value for our GMC's. I build a lot of various engines that
> have the chain/sprocket set up. Including our GMC's. Never install a
> roller. Except for the RPM's, and spring pleasure issue. Just because the
> double roller cost more. DOES NOT make them better for use in a GMC.
> Bob Dunahugh
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--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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