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Double row timing chain

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fwom moke

Post subject: Double row timing chain

Posted: Mon Apr 17, 2006 6:32 pm

848cc

Joined: Mon Mar 20, 2006 4:51 pm
Posts: 92
Location: Hampton. Victoria

What are the pros for using a double row timing chain in preference to the single?

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drmini in aust

Post subject:

Posted: Mon Apr 17, 2006 7:11 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

#1 Duplex don't stretch near as much.
#2 They are twice as hard to break. :wink:

No way I would run a single row chain with a modified cam, & stronger valve springs etc. They wear too fast.

Beware- lots of new chains are crap now, you can bend `em sideways straight from the box.
I bought a UK made, (supposedly) duplex chain for Barney, it was looser new than the old one. :lol:

I've had Chinese chain at work that is better.....!

Best I've found is the German endless `Iwis' duplex, but it's $50 or so.
You do get what you pay for.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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fwom moke

Post subject:

Posted: Mon Apr 17, 2006 7:14 pm

848cc

Joined: Mon Mar 20, 2006 4:51 pm
Posts: 92
Location: Hampton. Victoria

Thanks Kev
Do you have to do any mods to fit?
I've heard that you have to countersink bottom two bolts behind pulleywheel?
Also do you then need dual chain tensioner?

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Mike_Byron

Post subject:

Posted: Mon Apr 17, 2006 7:36 pm

1275cc

Joined: Mon Sep 19, 2005 4:57 pm
Posts: 3635
Location: Gulgong

Yes - absolutely you need to coutersink and use countersunk allen key bolts otherwise YOU WILL chew out the chain and the bolts seconds after the engine starts - No Exceptions

No - chain tensioners - I dont and have never had one one - has made no difference on my road car

Ask others

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drmini in aust

Post subject:

Posted: Mon Apr 17, 2006 8:25 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

You can also use c/sk head Mini brake drum screws, cut to length. Do `em up with an impact screwdriver.. oh and put a dab of Loctite on the threads. :wink:

<edit> I've never used or needed a tensioner with a duplex chain. Only one available right now is the A+ type (which uses a simplex chain).
People do use these on duplex ones, whether it helps I have no idea.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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supercharged 850

Post subject:

Posted: Mon Apr 17, 2006 9:28 pm

1275cc

Joined: Wed Mar 17, 2004 12:16 am
Posts: 5717
Location: Adelaide SA Ausmini Sales Department

I have been advised to run a SIMPLEX timing chain on my 998 race motor, purely as a weight/load saving advantage. Only downside is that the chain would need replacing more often.

_________________
[NATHAN] -- Sold everything mini related and am back in big beautiful BMWs

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drmini in aust

Post subject:

Posted: Mon Apr 17, 2006 10:21 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

supercharged 850 wrote:

I have been advised to run a SIMPLEX timing chain on my 998 race motor, purely as a weight/load saving advantage. Only downside is that the chain would need replacing more often.

I'd fit a belt drive kit- lighter, no stretching so no valve timing retard or spark scatter. :wink:

I've run one for 12 years now. No problemo.
I'll change the latest Kevlar belt at 50,000 miles...

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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supercharged 850

Post subject:

Posted: Mon Apr 17, 2006 10:26 pm

1275cc

Joined: Wed Mar 17, 2004 12:16 am
Posts: 5717
Location: Adelaide SA Ausmini Sales Department

drmini in aust wrote:

supercharged 850 wrote:

I have been advised to run a SIMPLEX timing chain on my 998 race motor, purely as a weight/load saving advantage. Only downside is that the chain would need replacing more often.

I'd fit a belt drive kit- lighter, no stretching so no valve timing retard or spark scatter. :wink:

I've run one for 12 years now. No problemo.
I'll change the latest Kevlar belt at 50,000 miles...

For the simple fact that I am out of money, the SIMPLEX off my Jap A+998 will be perfect :lol:

But yeah, point taken, belt would be the way to go. Hopefully theyre around the $120 mark :roll:

_________________
[NATHAN] -- Sold everything mini related and am back in big beautiful BMWs

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drmini in aust

Post subject:

Posted: Mon Apr 17, 2006 10:35 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

Well yeah, if you haunt eBay- Chong got his S/H but good for $100. :wink:

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Mini Mad

Post subject:

Posted: Tue Apr 18, 2006 2:03 am

ET 13.457 seconds , OH YEAH !!!!

Joined: Sun Sep 19, 2004 8:35 am
Posts: 7826
Location: Somewhere Around Sydney

What is SIMPLEX? is that just another term for Single rom or something different?

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drmini in aust

Post subject:

Posted: Tue Apr 18, 2006 6:44 am

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

Simplex = single row
Duplex = double row
Triplex = triple row ......

Sheesh... don't they teach anything in schools these days!! :lol:

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Mini Mad

Post subject:

Posted: Tue Apr 18, 2006 6:48 am

ET 13.457 seconds , OH YEAH !!!!

Joined: Sun Sep 19, 2004 8:35 am
Posts: 7826
Location: Somewhere Around Sydney

Hey, i figured it could have been something new and important since nathan capitalised it!

edit: There are triple rows? :shock:

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Lillee

Post subject:

Posted: Tue Apr 18, 2006 8:51 am

1360cc

Joined: Tue Jun 01, 2004 3:41 pm
Posts: 6858
Location: Special Tuning Sydney

Ahem I got mine for $150 and it wasn't on Fleebay

_________________
Lillee - 1969 Morris Mini K

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drmini in aust

Post subject:

Posted: Tue Apr 18, 2006 7:11 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW

Mini Mad wrote:

edit: There are triple rows? :shock:

Yep, there sure are, you won't see them on Mini cam drives though! :lol:

Strictly industrial Heavy Duty (often low speed) drives.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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