DAF Variomatic at work

[dalerobinsuk]

My dad had a Volvo 66 when I was a kid and could drive as fast in reverse as you could going forward!!

[bonsema1]

alomg with the famous Spyker 6 cyl. racing cars ot the early 1900´s, the DAF made a true , dutch , contribution to the car industry in the world. I think they built almost 1,000,000 of the little variomatic equipped cars including the ones sold under the Volvo name.

[pitstopsaki]

Что-то я не понял:так что,вариатор работает в открытом пространстве???Там же ремням пиздец придёт через 10000км

[WickedTRX]

allways thought that these cars didn't had a differential, and each belt drove each rear wheel, looking at the system now looks like the belts only divide the load an there's a regular diff, could anyone confirm that?

[bramjessen]

@WickedTRX All the other versions (600, 750, 3#, 44 and 55) use a system without a diff, like you described. Both sides can run at different speeds so there is some "diff-like" effect, but it reacts slower. The 66 (Daf and Volvo), 46 and later the Volvo 340 used a variomatic with diff like you see in this video. The 46 used a similar variomatic as the 66 and 340, but only with drums on one side, so using just one belt.

[PPGCSuicide]

great Video, toll sowas mal zu sehen, von wegen Internet bildet nicht =)

[jaggass]

its amazing the faster the wheels go the rollers go further in.

[ChrisLuxembourg]

The DAF is an amazing car.... You can drive so fast backward like forward!!! Cool!

[heatherandpaul2]

WHat does it use for a clutch?? Torque converter, centripetal clutch?

[bramjessen]

@heatherandpaul2 It uses a form of centripetal clutch. It does use a normal clutch plate. Weights sling out and push the plate forward.

[persiii11]

ey gospodinnee naprawo le66 stee

[persiii11]

ey gosspodinee le66

[TRcustomengineering]

What is this vehic

[ChuffChuffWoo]

Down shift was caused by a microswitch on the throttle which operated at either full throttle or idle, this released engine vacuum from the bellows via the small rubber tubes that down shifted the ratio, also, belt tension also downshifted the transmission, so the harder the engine pulled the higher it would rev - the latest version of the idea is the Toyota Prius, which instead of using two pulleys and a belt, instead uses two electric motor/generators connected by a controller. I drive a Prius

[heatherandpaul2]

@ChuffChuffWoo Thank you for the explanation.

[ChuffChuffWoo]

Daf wanted to sell the idea to other car makers, but it was too bulky to fit in to the then new fangled front wheel drive cars, so Daf set up a company, that drew investment from the big car makers to develop a steel 'flexi belt' that runs in a small oil filled box, most small automatic cars now use this system - the direct decedent of the Varomatic. Nissan use it in some of their bigger cars, my brother's 3.5 liter Maxima uses it to great effect - it is FAST!! My first car was a Daf.

[heatherandpaul2]

What is this cvt transmission's version of a "down shift"? I understand that the ratio gets ligher as the engine rpm increase. however, what if the engine is under load or going up hill. The engine will need to rev high and remain a higher ratio. How does this transmission do this. I see some vacuum lines going into the smaller pulley. Could that have something to do with this?

[Neproblem]

Круто !

[Seattlecarnut]

The only other car I've ever heard of that you can get a cvt was a Subaru Justy. I've never seen anything with the cvt transmission.

[olleng]

Daf rules!

[A9XXC]

My mother had a Daf 33 in about 1970 for a couple of years. She loved it until she hit a bridge! It was very strange - the engine would speed up as it slowed down !

Great fun car.

Mike

[Dallouez]

Years ago a man named PORSH invented a "Peoples Car" refered to as the VW. GI bought it to take home. A straight shaft. connecting the motor to the generator and the fan and NO water and no motors for heat and great in the desert and 4 bolts and the engine comes out. I could outdrive a tractor in the mud and it FLOATED! But people are lazy and stupid more money in junk and computers! Imagine a air cooled 60HP engine, DAF trann. Flywheel to keep it going. kickstart

[trossachs2003]

whatever happened to this technology. Apparently it worked quite well on the Dafs. Did no-one else ever pick it up...I belive some scooters use it

[bramjessen]

@trossachs2003 quite a few manufacturers have CVT cars, but they use a steel belt instead of a rubber one.

In this years Dakar rally the McRae Buggy's used a similar CVT that Daf had, with rubber belts

[trossachs2003]

Thanks bramjessen. I googled after I wrote that and I see that it is indeed quite popular.

[MrWindsor289]

@bramjessen What was wrong with cvts like this that they are not in use by automotive companies now? Why are they using that expensive solution with chain instead of this cheap rubber belt?

[bramjessen]

@MrWindsor289 Mostly marketing problems I guess....

There is also a limitation in horsepower/torque that a rubber belt can handle offcourse

[inar64]

@trossachs2003 to be honest about or even more than 95% of scooters use variomatics.

[desmodronic916]

@trossachs2003 All scooters use this system! :)

[lolzordje123]

@trossachs2003 all scooters use this principle, the reason a lot of car manufacturers dont use it, is because if you have a lot of hp, the cvt can snap easily,

atleast the rubber ones

[ChuffChuffWoo]

@trossachs2003 Daf couldn't built it small enough to fit in to a front wheel drive car using the rubber belts, so they founded a company called (if I remember)' Van Doorne Transmissie' that developed the steel belt that is now the common 'variomatic' of today. This rubber belt is the direct ancestor of the current technology and the company makes the steel belts for other car manufacturers. The Prius twin electric motor/generator cvt may well superceed it.

[boo66]

@trossachs2003 Most modern scooters use it, and all still pay a royalty to VanDoorne (not sure of spelling) bros!

[lichfielddrugsquad]

Ford AVO used this in a few V6 moto-cross cars built in the 70s

[Skyisnotalimit]

Funny cars.. Just as fast when driving backwards....

[burblebot]

Thank you for posting this video - amazing to see the CVT in action

[alexthepalix]

That explains the bizzare gearbox/drive sounds that most buses make.

[luiseduardo586]

Does it come with any protection against the road? mud, rocks water etc, any kind of guards?

[bramjessen]

The later versions had a plastic guard under it. But the first versions of the variomatic didn't have any guard, Water, mud and other things will just be thrown off by the centrifugal forces. I didn't have the mudguards on my Daf's and the variomatic was the cleanest part of the car :P

[elephantdong]

Yes, a large cover which must be removed for servicing...

[rib5004]

proper difficult to put back togtether fell to bits when i looked at one after stripping it

[bramjessen]

It's so simple, just 2 weights that sling out and a vacuum membrane, thats it :)

[mrspivvy]

I want to see somebody driving one of these dafs flat out in reverse. A peculiarity of the variomatic transmission means they can achieve maximum speed in either direction. cool!

[jks2]

blijft altijd leuk die ouwe dafjes

[sprijic2]

kinda how a snow mobile works

[intheshitter]

How much HP can you put into these ?

[bramjessen]

they used to race in the seventies with these 1100cc engines with an ouput of about 130hp. Without a turbo that is :)

The engine is acctualy a Renault engine which was also used in the Renault 5 series, including the GT Turbo. Those GT Turbo engines are known to be tuned to about 240hp but such an engine in combination with a variomatic wouldn't really work

[EvolveVolvo]

my nissan murano with cvt transmission has 265hp. works great. in my opinion, much better power flow then shifting thru multiple gears.

[daargummi]

That actually sounds really cool!

[carmenlee87]

Has that got a turbo?

[bramjessen]

hehe, no, just a 1100cc 4-in-line with 47hp

[houdanouhaili]

may i ask what kind of car is this from?

[bramjessen]

as it says in the description from the video, its the variomatic from a Volvo 66 '79 ('76-'80)

but a similar variomatic (with differential) is also used in the Daf 66 '72-'75 and in the Volvo 300-series '76-'91

note: Volvo bought Daf in '75, the Volvo 66 is basicly the same as the Daf 66 and the 1st versions of the Volvo 300 were designed by Daf as the Daf 77.

[InflatablePlane]

Very fascinating. It sounds really cool. I like that kind of sound:) BTW is the clutch centrifugal on this?

[bramjessen]

Yes, its a centrifugal clutch, but it does use a normal clutch plate.

[InflatablePlane]

Interesting. I can hardly find anything on these cars :( They never imported these to the States. Bummer :(

[cmalone43]

wow its the same a riding lawnmower transmission

[lucas1sacul]

Very interesting. Thank you.

[heatherandpaul2]

This is sooo cool. Im sorry for all the questions. I assume the rear pulley (wheel side) uses centrifical force to close or reduce in size, what controles the front pulley?? just a spring??? You mentioned something about vacum? What does it do for passing??? Like a down shift on the highway??

[bramjessen]

its the other way around, there are centrifrugal weights in the front pulley, the real pulley just has a spring

the vacuum is used to shift the variomatic into a higher gear and when you fully press the pedal it is used to shift down for kickdown

[heatherandpaul2]

Ok, please advise....I see that on idle one pulley (the engine side) doesnt spin with the engine like it would on a go cart or gator. I assume it has some kind of automatic or centrifical clutch or something. How does that work???? How does the engine fulley disengage from the wheels at a stop?

[pcgamer6]

yes, Dafs do have a centrifical clutch. The eight clutch shoes engage and disengage as necessary. I happen to own a Daf, it really is cool.

[Xavi959]

is that a car???

[bramjessen]

offcourse that is a car! This one in particular is a Volvo 66

if you look in my video's you can see a video of a Daf 66 Coupe, almost the same car but it has the same transmission

[Xavi959]

Cool!!!! I want one of those!!! :P

but there's still something that I have not understand yet at all...why the band doesn't slide off???.

[bramjessen]

There is tension on the belt, it is simply not long enough to fit over the end

[Xavi959]

humm yeah but, is the band "stick" to the pulley because of simple friction or because the pulley has grooves at it's faces?

[bramjessen]

just friction.

[ichmalealsobinich]

I have driven a Daf 44 for nearly 6 years, my first automobile. The variomatic technique took its greatest advantages in the mountains in cooperation with the choke pulled out. When I had to climb a slope in the Eifel or Ardennes I had the rare pleasure to left MB and BMWs behind me.

[muddydisco4]

spent many hours in my youth working on these!! it always impressed me that the car would still accelerate as you gently released the accelerator.this is because the primary unit is operated by manifold vacuum.

[jaggass]

what about when its on the ground? pull the choke out

[bramjessen]

not possible.

The volvo's have a swtich that lets you rev it to about 1500rpm

a Daf you can rev to about 1000rpm (or you should, with a proper working clutch)

[jaggass]

how do you rev the engine without moving?

[bramjessen]

The car was on axle stands, so the wheels were of the ground

[Kitecinema]

Vette shit dude , ik heb dit ook. Super spul!

[ToberMcGee]

My grandfather told me about a motorized scooter he had in the 40's that had CVT. He didn't call it that, but his description of how it worked is the same. Ingenious technology.

[folgosa01]

Cool video. My parents had a 1977's Volvo 66 GL (3 doors).

[aDaWaN]

Really cool video guy !! Gave shit ;)

[skodas]

all daf had it and the volvo 343 series had it as well

[tonijn1969]

what type daf is this,and axjonte volvo 66 have a renault motor

[axjonte]

Thanks! That was cool. I have a Volvo 66 from 1976 with Variomatic.

[ffwd85]

you must have a lot of fun driving backwards,80 km/h?try that(if you didn't)

[bramjessen]

only 80? technicaly it can do about 140 backwards (and forwards :P)

I think the max I did backwards is somewhere between 60 and 70

[Clin10]

that is cool! nice CVT man. I am wondering, how did you have the camera? was the car on some kinda lift, or did you mount it on the bottom of the car?

[bramjessen]

The car was on axel stands.

[85x70]

Nice gearbox! I think this is the best gearbox ever made.