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The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Timing chains kit
PostPosted: Sat Jan 05, 2019 7:01 pm 
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Location: Harrow Middlesex
I see Rimmers sell a conversion kit,to convert single chain to Duplex,is the Duplex chain harder wearing ? and is there enough room behind the timing cover to get it in ?

Dave


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 Post subject: Re: Timing chains kit
PostPosted: Sat Jan 05, 2019 8:27 pm 
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All Sprints have duplex as standard Dave


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 Post subject: Re: Timing chains kit
PostPosted: Sat Jan 05, 2019 9:06 pm 
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All Sprints have duplex as standard Dave
Alun

Thanks,I was really thinking about 1850 / TR7 is it a worth while mod to do, do Duplex chains last longer ?

Dave


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 Post subject: Re: Timing chains kit
PostPosted: Sat Jan 05, 2019 9:09 pm 
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You cant fit duplex to slant unless the deeper timing cover is used and the double sprockets wont fit in standard cylinder head area. The duplex conversions apply to OHV engines where there is space.

Tony

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 Post subject: Re: Timing chains kit
PostPosted: Sun Jan 06, 2019 10:06 am 
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Is there any real advantage of fitting a duplex timing chain to an OHV engine or will it just increase the timing chain noise?


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 Post subject: Re: Timing chains kit
PostPosted: Sun Jan 06, 2019 4:52 pm 
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Is there any real advantage of fitting a duplex timing chain to an OHV engine or will it just increase the timing chain noise?
On a std engine of no use. It will only cause a mariginal loss of hp.

Jeroen

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 Post subject: Richard….
PostPosted: Sun Jan 06, 2019 4:55 pm 
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Is there any real advantage of fitting a duplex timing chain to an OHV engine or will it just increase the timing chain noise?
On the six cylinder engines, the 2 litre was simplex
whereas the 2.5 duplex.

On the T2000
it was common to uprate their 2 litre engines because the duplex chain is much longer lasting.
If there is increased noise I haven't heard mention of it.

I don't have the part numbers to check, but I think the four cylinder and six cylinder 2.0 timing gear is identical.


Something to consider is the tensioner, Chris Witor doesn't have OE. The replicas only last a fraction of the time
https://www.chriswitor.com/proddetail.php?prod=145866RP


Ian.

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 Post subject: Re: Timing chains kit
PostPosted: Wed Jan 09, 2019 11:14 am 
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Location: Halifax, West Yorkshire
The replacement engine I'm (slowly... 2 years in!) building for the Spitfire (1500) will have a duplex chain and vernier timing gear for 2 reasons....
1) I have trust issues with some replacement parts (ie. timing chains) with regard to quality.
2) I intend to tune and thrash the nadgers off the engine once it's finally complete.

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