Carby choices

[K_Man]

G'day guys, I've been searching the forums, cant really find what I'm looking for.

I'm thinking about getting a decent carb for the 1600 I'm planning to chuck in that I have sitting in the shed (thanks again Golf Loon ), but i honestly have no idea what kind of changes different carbs will make. I was reading Bluerex's post a while back about a 45dcoe on his motor, what kind of performance would this add compared to the stocker on it now (dont even know what size the stock one is)? How would this compare to a twin 40dcoe setup? I also have extractors that will be on this motor, just looking for some decent get up and go at the lights.

Damn carby cars, dont know a bloody thing about them

Cheers!

[Jarred]

i dont know much about carb either, but i figure the twin 40's will give more power, as they'll be able to flow more than a single 45? seems to make sense, but im not 100% sure! have you thought about going K-jet, (apparently) it will give you more power and better economy, and i thiknn you can get up rated injectors (off a volvo 740t or something) and that wil give you more than enough off the line.. sounds good in theory, but probably costs a fair bit more no doubt! hope that resembled help!? haha
have a good one

[Peter Jones]

The stock carby is pretty restrictive and is renowned for idling issues.

I run a weber DGAV on a passat manifold. This is a good first step. It performs better than the stock carb as it is a two barrel setup, being progressive the second barrel only opens at full throttle which should , in theory , help with fuel economy. The DGAV is a downdraught carby. It also has a choke for cold starts which can be setup as electric or manual.

Next step up is a single sidedraught Weber DCOE or the Dellorto equivalent. Faster but no choke and might use more fuel.

Twin sidedraughts is the best carby performance option but economy and cold starting might be a bigger issue. Twin Webers look and sound fantastic!

I'm sure others will chime in with venturi and jetting issues as required

You've opened a can of worms with this one!

Pretty much any carby is better than the stock 1600 for performance!

Pete

[mollins]

Any upgrade to the standard carby will be good for get-up-and-go, you will use more fuel though. My yellow mk1 1.8 has a 45DCOE (sidedraft weber) on it, and its awesome. My white one has a 1.6 with a 40mm dellorto, but im yet to see how that goes on the road as its currently interiorless.

The twin carb setup gives you 4 throttle bodies (about 4 times the inlet area of your current setup) and thus gives you more air+fuel, which equals a heap more kick. sounds awesome too

btw.. the weber dcoe and dellorto dhla range have manual chokes for cold start

I still have two 40mm DCOE carbs for sale if you are keen, just let me know.

[Peter Jones]

btw.. the weber dcoe and dellorto dhla range have manual chokes for cold start

Cool, happy to be corrected on that score.

All the more reason to go sidedraughts!

Pete

[gldgti]

hey pete, you dont have another DGAV and matching manifold do you? i'd like to give something like that a go.

[Peter Jones]

hey pete, you dont have another DGAV and matching manifold do you? i'd like to give something like that a go.

Not at the moment, but they're pretty common. Put the word out for a passat TS manifold in the wanted section and you'll soon find one. I think the DGAV was factory fitted to the 2.0L Cortinas (I might be wrong on this , anyone?) so it shouldn't be too hard to track one down.

There's a pic of mine in another thread, hang on a sec, here it is...



You can make out the choke cable running back through the firewall. The car was originally a diesel so there was a bracket for the choke (cold start valve in the diesel) on the column.

The original throttle cable works with a bit of fiddling about.

Pete

[Peter Jones]

Actually looks like Loon might have what you're after!

http://www.vwwatercooled.org.au/newforum/upload/showthread.php?t=6152

Pete

[Golf Loon]

That Cordy engine looks good Pete

[Peter Jones]

That Cordy engine looks good Pete

Stand by for an update, I'll have it running later today!

Pete

[K_Man]

So how is economy on a 45dcoe compared to twin 40's? Something i have to look at soon, my car just blew it's head gasket and i gotta get the next motor in.....that motor came at just the right time

[syncro]

I have heard a few reports that the twins are more efficient. I don't really know of anyone that has a single with a Lynx manifold that works properly. No3 always runs rich.

[GoLfMan]

I have heard a few reports that the twins are more efficient. I don't really know of anyone that has a single with a Lynx manifold that works properly. No3 always runs rich.

its because the lynx manifold has a weird firing pattern, the dissi needs to be modified i believe

[Oneofthegreats]

I reckon it would be more of a case with the brake booster vacuum signal upsetting both #3 & #4 cyl's off #4. These manifold's are grouped as pair's eg. 1 & 2, 3 & 4 so 1 & 2 are basically on there own & are fine.

You have to run the passenger side (3 & 4) mixture richer to even out for the brake booster vacuum signal on #4 the catch 22 is that #3 run's richer than the rest.

With twin carb's you can tune out the descrepancy in #4. I've had to do this on my 2L excort with twin 40 dell's.

[gldgti]

its because the lynx manifold has a weird firing pattern, the dissi needs to be modified i believe

you'de need to do a lot more to change the firing order mate

but no, it not necessary to do that - mollins setup seems to run just fine with his dcoe on lynx.

got a TS manifold today (cheers loon ) so on the lookout for a dgav now.