Just a quick question on flaps

[nutbox]

Hi there,
I have a 2.0cu ac engine with out no thermostat fitted ,I was wondering do the flaps fail open or closed and do they need to be wedge open?
Thanks dazz

[camper]

From memory there should be a spring on the flap linkage .This will keep the flaps open if the thermostat was fitted once the engine warms up the spring effect is overcome and the flaps close..Check to see there is a spring keeping the tension on the linkage.

[toolsntat]

From memory there should be a spring on the flap linkage .This will keep the flaps open if the thermostat was fitted once the engine warms up the spring effect is overcome and the flaps close..Check to see there is a spring keeping the tension on the linkage.

I could be wrong but I thought the stat held them shut when cold to help get the engine to operating temp sooner and then the spring was allowed to open them as the bellows of the stat expanded.

So you would need flaps SPRUNG open or wedged open Dazz

Andy

[camper]

From memory there should be a spring on the flap linkage .This will keep the flaps open if the thermostat was fitted once the engine warms up the spring effect is overcome and the flaps close..Check to see there is a spring keeping the tension on the linkage.

I could be wrong but I thought the stat held them shut when cold to help get the engine to operating temp sooner and then the spring was allowed to open them as the bellows of the stat expanded.

So you would need flaps SPRUNG open or wedged open Dazz

Andy

Yes think thats the correct method .been a long time since worked on a 2ltr cu .

[bigherb]

Yep the spring holds the flaps open it's fitted here and the arm should be vertical when the flaps are open, mines in the closed position.
Worth fitting a thermostat much kinda to the engine.

[aahyoo]

Sorry for the irrelevant post... but this was to be my favourite thread title ever

Ru
aged 31

[CovKid]

We all thought it. Just wondered who'd be daft enough to comment.

As an aside, VW designed Aircooled 'shutters' to remain fully open by default so that you can't cook your engine accidentally. That goes back to the Beetle. Likewise if the thermostat fails, 'shutters' won't remain closed.

[nutbox]

Thanks for all the comments I shall leave as is ,where can I get a thermostat and bracket from?
Cheers dazz

[sarran1955]

Hello,

Thermostat 84€,

Tried, and most disappointed..

Remove the flaps and bar... ( you risk being burned at the stake by the 'your engine will heat to 1 million celcius ' brigade)

Block off any air holes in the tinware,..

Like this:



Let the engine warm up gently..

Aircooled bliss

Cordialement,

[benlawlor85]

I havent really used my van much yet, But i have the 2l CU lump with twin solex carbs. Is it worth ripping the flaps out as a matter of course? you seem to be the expert on these A/C beasts. great vids about the carbs BTW just need a rev counter and a snail and im gonna have a go!

Cheers

[bigherb]

Is it worth ripping the flaps out as a matter of course? you seem to be the expert on these A/C beasts.
Cheers

No they are there for a reason. Unless you can defy the laws of nature and make airflow turn corners without any deflection.

[benlawlor85]

Ok herb point taken,

Thats a pic of where the cable joins the bar. the van was cold at this time. does that look right?
Cheers
Ben

[sarran1955]

Hello,

Just got back ....

After an 840 km ... flap free.. dash up to Le Mans ..

I'm testing out various points settings and dwell angles, against E98 (98 RON) and E10 (95RON) petrols..

28 mpg on a motorway run, 24 cross country, but with a high compression engine I'm better off with E98.

By all means leave the wongy flaps in place..they 'fail to the 'safe' position.. and the bar and spring look SOOOOO pretty

More interesting.. why do you have a bungy cord for the throttle return....

If your carbs and throttle cable are set up ok, then the spring system on the carbs should be sufficient..

Cordialement..

[Plasticman]

you get the spice
mm

[benlawlor85]

Hi. So im better off ripping the flaps out!?
As for the bungie. I have no throttle return spring. One arrived yesterday tho. But the carbs need to be balanced and probs need some new springs anyway. Ill look into this as soon as I get a trailing arm to replace my rotten one.
Cheers
Ben