Duplex timing questions

Post by **jackkelleher** » Thu Aug 02, 2007 2:46 pm

Is it worth getting duplex timing gears? What are the advantages? Are there any cons? Really, the simple question is: should I get duplex or single?

Post by **badfelafel** » Thu Aug 02, 2007 2:52 pm

i asked the same question recently, and am still not sure!

Post by **jackkelleher** » Thu Aug 02, 2007 3:02 pm

I'm rebuilding the engine, and the timing gears have to go anyway, the main sprocket was a mini one fitted without necessary bracer or something- so I just wondered whether it was a good idea to get duplex!

Post by **badfelafel** » Thu Aug 02, 2007 3:13 pm

Have a look here

Hope that helps!

http://www.mmoc.org.uk/index.php?name=P ... ght=duplex

Post by **jackkelleher** » Thu Aug 02, 2007 3:33 pm

Thank you, that's very helpful... All right, off I go to rebuild the old crate!

Post by **wibble_puppy** » Thu Aug 02, 2007 3:40 pm

a tip from one who has just been there:

take the front plate off and use a pillar drill, when you countersink your two holes. It's very hard to get the drill dead on 90 degrees to the plate otherwise.

Post by **jackkelleher** » Thu Aug 02, 2007 7:05 pm

Thanks... I'll remember that. Very helpful. I think we have a pillar drill boxed up somewhere- I'll try and find it!

Post by **bmcecosse** » Thu Aug 02, 2007 8:24 pm

It's certainly safer to do it that way - no chance of swarf getting in the engine - but it CAN be done on the engine - in the car if necessary! Duplex is really only required if using a high lift/long perid cam with stronger valve springs - otherwise it's a bit of a waste of money! But if you need new gears anyway - the duplex set-up doesn't cost much more. No real need for fancy 'adjustable' timing gears unless for competition use.

Post by **jackkelleher** » Fri Aug 03, 2007 2:53 am

The block is currently out of the car and stripped of all removable parts pending replacement of most of said parts, so access shouldn't be a problem... I might as well go for it!

Post by **bmcecosse** » Fri Aug 03, 2007 10:04 am

Good time to fit a better camshaft!

Post by **jackkelleher** » Fri Aug 03, 2007 10:45 pm

Should I? With a new cam, how much else will need to be different? Pushrods? Will there be an increase in performance, decrease in economy, notable change of any other sort? Lots of questions, I know, but I want to consider these things seriously so my Moggy runs sweetly when reassembled...

Post by **bmcecosse** » Sat Aug 04, 2007 2:46 pm

MG Metro cam is a perfect choice - specially designed by MG/Rover to increase the power yet still be docile in traffic with good mpg. Pushrods remain same - will need a later type oil pump - but these are far better pumps anyway!