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Post by elephantsuk on Jul 11, 2006 16:10:54 GMT
I have an old pug 205 with the 1.4 XY7 engine from the Talbot Samba. It has a tiny single choke carb fitted, which I want to swap for a twin choke item similar to that of the later TU series XS engine.
Any ideas? Will the XS carb fit? I know the early 205 GT had twin solex carbs but I have been reliably informed that these are a pain to keep in tune.
Cheers
Kevin Webb
elephants_uk@hotmail.com
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Post by Admin on Jul 24, 2006 14:58:35 GMT
The TU and XS engine have different cylinder heads so I would imagine an adpater plate would be needed. You would be better looking for a bigger carb from another XY motor. The 1124 engine on the ZS had a solex twin choke carb (32 PBSA or similar I think. This is quite a good carb and will bolt straight on.
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Post by madrat on Jul 25, 2006 13:47:04 GMT
or try a carb from a 1.4 engine of the same type, you might have a few problems with over or under fueling unles you get the jets calabrated after fitting.
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205tref
Poster boy
le moteur de mon peugeot est sur la table de mon ?pouse
Posts: 143
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Post by 205tref on Jul 26, 2006 20:19:14 GMT
Weber stud patterns are usually pretty much of a muchness within a given range.
don't underestimate the problems that linkages could give you though. iirc the throttle linkgae on the xy carb pulls on the other side to the TU - this could well lead to adaptors being needed.
stick with xy intended carbs unless you want a proper mission!
general wisdom is that a bigger carb (within reason) can be down jetted far more easily... but you don't want too large a choke for your cylinder or you'll never get your ratios right.
the 32 PBISA is probably really quite a good low-pain high-gain way forward, but try to get a rebuild kit and service it before fitting - this is a delicate and tricky job but well worthwhile. If you don't fancy yourself as a clockmaker (they really can be fiddly) there will be any number of carb specialists who will happily take your money to do the job!
i can post some carb theory if anyone is interested...
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Post by Admin on Jul 26, 2006 21:02:31 GMT
i'll post some more theory in a wee while if anyone interested... always  |
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Post by Admin on Jul 26, 2006 21:04:56 GMT
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205tref
Poster boy
le moteur de mon peugeot est sur la table de mon ?pouse
Posts: 143
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Post by 205tref on Jul 26, 2006 21:44:59 GMT
the other points to bear in mind with the TU XS carb are that the cam in this engine is very different and will give you a nightmare trying to get jets right, and then there's the wisdom of attempting a big power up on an old engine to bear in mind....
the xs carb & cam combo that makes the difference between the TU3/TU3A in the standard cooking 1360's and the TU3A in the XS is frequently credited with being able to give you a real world +15bhp boost to a good condition TU3 for very little work. This is quite a large boost to be giving an elderly engine without some tlc! and might be enough to show up any nasties that were lurking. I had a similar experience with an escort that i'd done something very similar to that was fine until i really went for it and ended up in the middle of nowhere leaking oil and water from many blown gaskets...
if you're serious about going on the power quest then you should really make sure that all is well with your engine first (compression tests etc) and if you're really going on a mission you might even want to consider getting a re-worked head (effectively getting more out of what you have and more out of anything else you fit) but this is not a cheap way forward (prob £400+). it may also be a good idea to source a new distributor as older dizzys can be apparently fine and still have a surprising amount of wear. new dizzys can still be ebayed quite cheaply!
also bear in mind that the xs ran on a different gearbox that was set up with ratios to give faster acceleration at the expense of ultimate top speed.
the TU gearboxes are no use to you, nor the driveshafts as they will not fit, but changing box for one with lower ratios is a very easy way of upping non-topend performance.
puma racing (http://www.pumaracing.co.uk/) are a very good source of info on all aspects of tuning theory and the 205 in particular (if a little centered around the 1.6 & 1.9) but the points made carry across.
have fun and let us know how you get on!
Tref
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205tref
Poster boy
le moteur de mon peugeot est sur la table de mon ?pouse
Posts: 143
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Post by 205tref on Jul 26, 2006 22:09:47 GMT
oooohhh! i should refresh more often! yes, the engine vs carb chart is a fantastic resource that we're really lucky to have ! i know ppl who will buy books for similar resource  how do we stand on posting published material? The best carb theory 101 i know of is a chapter in the Haynes Big Book of Webers with lots of pretty graphs and diagrams that says it all much better than i could. afaik it's out of print as most of it is now irrelevant to anyone not tuning/modifying 60s and 70s vehicles, but i can pdf a bit or just describe? |
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