duplex with a tensioner?
Turbo Mini Forums

Having never run a duplex it looks odd to me without a tensioner. Do people put a tensioner on or not bother? All other cars I have are simolex or belt.

Cheers

Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Mine has a tensioner on a duplex.

It seems weird not to.

In the 13's at last!.. Just

So does mine

Craig

my mini van http://www.turbominis.co.uk/forums/index.php?p=vt&tid=448248

IMO any timing drive should have a tensioner.

mine does also!

duplex no tensioner.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

Duplex with tensioner

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

I think I'll stick a tensioner on then.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

and me.

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

None of the major engine builders fit them, neither do I. They arent wide enough to support all 3 rows of links so it just puts pressure on the inner one which strains the pins, though Ive never heard anything bad happening because of fitting them

I seriously doubt it!

i broke my tensioner trying to fit it, and the chain felt tight enough
alas i never fitted one

Yes i moved to the darkside

Instagram @jdm_brett

I do not have one, benross said there was no need.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

Well now I'm thinking I won't bother. It would be easier without and the engine is so noisy anyway I doubt I will hear a little rattle. Decisions, decisions.....

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

I've fitted one and it was wide enough to cover all three rows of links (but only just).

Schrödinger's cat - so which one am I ???

I,ve been fitting tensioner/duplex for years with no problems.

(Other than when one of the countersunk screws came loose and broke the chain !)

Don't bother Ben. Think of the weight. If it rattles and is annoying, fit one later. It's an easy job with no front bodywork and a front rad.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk

I always run them, I'd rather have accurate control over the cam timing, than random scatter, running without a tensioner is to cam timing what a dizzy with worn spindle bearings is to ignition scatter - not desirable!

If Carling made Mini engines
it would probably be like this one!

With tensioner. Without your cam timing can be affected as the chain whips about about at different engine speeds on the tensioner side. Dont know why you wouldnt fit one really, seems silly not to.

Theres a video somewhere of a K20a type r Chain (longer chain I know) with the tensioner fitted and you wouldnt believe how much the chain jumps about, and thats dampened.

I wonder just how much it would affect cam timing. Concidering the load on the cam, the short chain and I can't see it being much. Has anybody measured it or is it all just speculation?

I can see the unloaded side of the chain flapping about, but that won't change the cam timing so who cares?

Still undecided.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

The Kent timing set that Swifty sells are designed to eliminate chain whip. Mine has no movement in it at all still after 2 years of use so no affect on timing.
Seems ridiculous to me to fit a tensioner that doesnt fit the chain properly

I seriously doubt it!

Mine does have a little movement. I think I will try without and see how it goes. Also I don't hae a tensioner in the garage so that biased the decision a little.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

i use one on my engines. the timing chain just seems too slack without. though many people run without, as shown in this post, i think its a matter of personal preferance

It should not be a matter of personal preference. There is a better way, but we have no data. Choosing a colour is a personal preference.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

If you have the Backplate and Cover to suite the Tensioner then fit it.

Its like carrying condoms. Better to have them and not need them than need them and not have them.
:)

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/