Saw this on BaT

[Shaun @ Tru6]

1966 McLaren M1B


Turn up the volume

[Sooner or later]

Purty

[pavulon]

That's a significant updraft peeking out the tops of those webers!

[wdfifteen]

Wow!
Thanks Shaun.

[URY914]

That car or one just like was at Daytona this past weekend.

[kach22i]

I could not get my mind off the door NOT being shut all the way.

[Nickshu]

That car belongs to a friend of a friend of mine. He sent me videos of the shakedown runs a few months ago. The sound that it makes!!!! Awesome!!

[Baz]

The Glory Days!

[cstreit]

Thats here at Autobahn country club... Cool display of reversion in the intakes...

[Dantilla]

Originally Posted by pavulon

That's a significant updraft peeking out the tops of those webers!

Since its visible only at full throttle, seems to me the engine is sucking in so much intake air that it's dropping atmospheric pressure to the dew point.

Like the top of an airliner's wing during initial climb under ideal temp/humidity spread.

[Shaun @ Tru6]

Originally Posted by pavulon

That's a significant updraft peeking out the tops of those webers!

Originally Posted by Dantilla

Since its visible only at full throttle, seems to me the engine is sucking in so much intake air that it's dropping atmospheric pressure to the dew point.

Like the top of an airliner's wing during initial climb under ideal temp/humidity spread.

I was wondering what that was, thanks, another example of the greatness of the OT braintrust.

Cars like this is why I have to get back to work on a few inventions I am working on.

[RonDent]

If I remember correctly, that car was at the Monterey Rolix Reunion this past August. Great to see those great cars on the track.

[pavulon]

I remember reading about weber carbs not happily accepting a certain amount of valve train lift overlap as well as benefiting from a plenum box above (to mitigate rear carb air starvation at speed) and directly below the carbs. Some Fords intakes had a small bulge cast into them expressly for this.




Reversion with Webers - Club Cobra

[Noah930]

Forget the Christmas Exchange. PPOT group buy? Who's in?

[GH85Carrera]

I was watching the video as my wife just returned from lunch. She accused me of watching car porn. Guilty.

[wdfifteen]

Originally Posted by pavulon

I remember reading about weber carbs not happily accepting a certain amount of valve train lift overlap

It’s not overlap per se, it’s the cam holding the intake valve open when the piston starts to move up in the cylinder. The cam timing and length of the intake track are tuned to provide max power/torque at specific rpms. At certain rpm this produces positive pressure in the i tack track at other rpm.

[pavulon]

Originally Posted by wdfifteen

It’s not overlap per se, it’s the cam holding the intake valve open when the piston starts to move up in the cylinder. The cam timing and length of the intake track are tuned to provide max power/torque at specific rpms. At certain rpm this produces positive pressure in the i tack track at other rpm.

This sounds like camshaft lift duration.

My understanding is that lobe separation angle (LSA) is the issue.

https://jiminglese.com/common-questions

[URY914]

[Discseven]

Originally Posted by GH85Carrera

I was watching the video as my wife just returned from lunch. She accused me of watching car porn. Guilty.

.

[pwd72s]

Originally Posted by Baz

The Glory Days!

Thanks for posting this...The beginning of the end for the Can-Am...