volvo 340 1.7

Post by **SteveP** » 24 Mar 2006 10:21 am

Yeah - it's definitely in the 80bhp range - strangely the same engine in Renault cars always produced more..

Post by **Chris_C** » 24 Mar 2006 10:30 am

I'm not convinced how true this is, but the 1.4's are around 75ish right?

I don't know if it's because I'm running a weber carb already, but I know Fake is a lot more acceleratey, is that because the engine is torquey more than it has more horses? It's definately quicker, I'm having trouble keeping her below 90...

Post by **SteveP** » 24 Mar 2006 10:50 am

Thought you said the 1.4 was quicker than your 1.7

I expect the weber carb will be helping things actually...

Post by **jtbo** » 24 Mar 2006 11:12 am

Users manual says 80hp for 1,7l (1988 model)

Post by **Chris_C** » 24 Mar 2006 12:01 pm

SteveP wrote:Thought you said the 1.4 was quicker than your 1.7 I expect the weber carb will be helping things actually...

It was, until I worked my godly power on the carb. Just wish I knew what I'd done....

Post by **schakal** » 24 Mar 2006 12:20 pm

340cbr wrote:There's a guy here in Portugal who has a Clio with the 1.7 engine

He wanted more power, and what he do was buy a Sierra 2.0 weber carburator, change the jets an dsomething related with te air in the carb..

The car was running pretty well and very fast

i have never hear dof a 1.7 engine
used in any clio as standard for a start

i have been trying to locate a replacement carburettor that would bolt on to the original manifold straight away for ages ,i wanted a different make as well cause apparently SOLEX is crap .

do you know if this guy used the original manifold or did he have to get something custom made for the carburettor ????

Post by **schakal** » 24 Mar 2006 12:22 pm

pettaw wrote:Its the air corrector jets.

what do they do ??

Post by **schakal** » 24 Mar 2006 12:25 pm

foggyjames wrote:Putting a larger carb on and having it rejetted is probably a wise move for a mild upgrade. Stick a longer duration cam on while you're at it, but bear in mind that this will make your car more rev-happy. If you have tall gears, that might not be a good thing.

My car was pretty awesome down low with the original cam in it with the huge carbs.

cheers

James

the longer duration cam i know of comes from the 480 turbo head ,apparently it is 270 or 290 degrees i am not sure ,the standard on my car is 220 .

what cam did you use ?? did you have any rough idling with that if you know what i mean ???

Post by **schakal** » 24 Mar 2006 12:26 pm

SteveP wrote:Yeah - it's definitely in the 80bhp range - strangely the same engine in Renault cars always produced more..

can it be something to do with the renault 9 being a fwd and the volvo 340 being a rwd as well ???

Post by **schakal** » 24 Mar 2006 12:35 pm

jtbo wrote:Why 360 2,0l has smaller than 1,4l moped engine

There is certain limit how big you can make jets as there is carb throat and it can deliver just certain amount of air now you would like to have air 13 times more than gas to get best power, figure out throat size and maximum amount of air that can pass trough and you can calculate maximum size for jets.

that would be 14.7 as far as i know mate

Website · Post by **antiekeradio** » 24 Mar 2006 12:45 pm

Yeah - it's definitely in the 80bhp range - strangely the same engine in Renault cars always produced more..

not so strange.

Volvo detuned the stock renauls setups for a bit more economy, and much more reliability/lifespan

the ignition COIL, as well as the looks of the UNIT may be the same... the ignition curve, is different!!

also; don't get fooled by jet sizes. there are umpteen differences between carburettors, making the jet sizes 99% uncomparable.

The weber DIR and solex CISAC, are totally different, but both have a very, very, very wide range of subtypes and versions. all sorts of internal tubing/bores/fixed jets can be present on a given version, and closed off on another.

So, the renault 1.7 carb. has a bit more power than its Volvo sister, due to it being run at a higher thermal and mechanical load maximum

Greetings Wouter

Post by **jtbo** » 24 Mar 2006 01:11 pm

schakal wrote:
jtbo wrote:Why 360 2,0l has smaller than 1,4l moped engine

There is certain limit how big you can make jets as there is carb throat and it can deliver just certain amount of air now you would like to have air 13 times more than gas to get best power, figure out throat size and maximum amount of air that can pass trough and you can calculate maximum size for jets.
that would be 14.7 as far as i know mate

Wrong, 14.7:1 is compromise between power and fuel consumption, Naturally aspirated engines generally produces best power around 13:1 Turbos need richer maybe around 12:1 some more some less, depends of course amount of boost used and many other factors. Best economy is around 15-16:1 range, however some engines are not able to run lean.

http://ffp-motorsport.com/tuning/o2meter.php
This is good information, but for example it says that best economy comes at 15,4:1, that may be case in one engine but maybe not for another, in theory it may be that number but it really depends many things, even from how much engine has been driven and only with careful tuning you can reach those sweet spots.

With carbs I think that getting mixture right for each load/rpm condition is impossible, maybe possible to get mixture to certain for cruise, idle and full load and anything between is more or less near?
But I don't really know too much from carbs, I know few basics but I really have never fiddled with them and I try to keep it that way, they are too complicated devices

Post by **pettaw** » 24 Mar 2006 01:25 pm

Carbs are extremely complex, but can be tuned to be perfect under all circumstances.

Modern carbs have all sorts of progression drillings, and vacuum modifications in order to do this and therefore if you go too far from what they were designed for then you'll run into all sorts of difficulties

Post by **foggyjames** » 24 Mar 2006 07:55 pm

For what it's worth, it's not usually a good move to give people who are trying to help you the

340CBR is in Portugal IIRC, where they may well have had the 1.7 in the Clio.

I'm running a 270 degree cam, and the idle is silky smooth when the carbs are set up right. As for Solex being crap....don't believe a word of it.

cheers

James

Post by **schakal** » 24 Mar 2006 08:01 pm

foggyjames wrote:For what it's worth, it's not usually a good move to give people who are trying to help you the 340CBR is in Portugal IIRC, where they may well have had the 1.7 in the Clio.

James

what are you on about mate ?
i am not having a go at anyone and i do appreciate the help a lot .
what i said was i have never heard of a clio with the 1.7 engine ,and if there is one i would not make a big issue out of it .