Vixen 302 V8 Tweety
Discussion
ephemera said:
Breath of fresh air, for the first time out of the garage. Not an originality restoration, but bit of fun and engineering. Ready to be driven in anger. Tire sizes changed to latest spec, 235/60R15 rear, 205/60R15 front.
Nicely done.Aesthetically it's crying out for a black decal along the side.
Now Tweety has become an Angry Bird.... here two short videos with some sounds:
https://vimeo.com/293519683
https://vimeo.com/293519709
https://vimeo.com/293519683
https://vimeo.com/293519709
ephemera said:
Now Tweety has become an Angry Bird.... here two short videos with some sounds:
https://vimeo.com/293519683
https://vimeo.com/293519709
Hahaha! Awesome! Good at idle, but exhilarating, when the revs climb! https://vimeo.com/293519683
https://vimeo.com/293519709
B
Last week working on a polycarbonate ('Lexan', so clear) airbox experiment. I am now using shorter trumpets than the original set to ensure enough clearance above the bell mouths. Next month the fine tuning on the chassis dyno is planned, maybe I can do a comparison between the different options. The airbox is receiving cold and filtered air from the two sides of the nose, near the indicators. Technically a better option than hot and unfiltered air from the engine compartment of course. I didn't want to use trumpet filters, socks or foam filters, but I also wanted still to be able to see the ITB's, so let's see if this works. Yes it's square, not too big and no flow calculations have been done, but on the other hand, I haven't really seen a fully transparent airbox before. If it doesn't work properly, I will go to plan B. ![](https://thumbsnap.com/sc/JBWRpfF7.jpg[/img]</a> <a href="https://thumbsnap.com/PVOJP9WZ" Target="_blank" rel="nofollow">[img]https://thumbsnap.com/sc/PVOJP9WZ.jpg[/img]</a> <a href="https://thumbsnap.com/Y9Vr8H0S" Target="_blank" rel="nofollow">[img]https://thumbsnap.com/sc/Y9Vr8H0S.jpg[/img]</a> <a href="https://thumbsnap.com/rJbqXWKe" Target="_blank" rel="nofollow">[img]https://thumbsnap.com/sc/rJbqXWKe.jpg)
Edited by ephemera on Saturday 20th October 01:30
Edited by ephemera on Saturday 20th October 01:45
You shouldn't fully seal the airbox But also allow it to receive air from the dense area at the lower part of the screen at the rear edge of the bonnet, You can still essentially follow the same plenum idea but open up the rear and carry on with the sealed chamber but also taking air through the rear bonnet vent. Air hear is densest and will give you a very good intake charge. I would also open up the top and allow for a top seal so that the bonnet closes onto the seal forming the plenum.
N.
N.
Edited by Dollyman1850 on Saturday 20th October 08:08
Edited by Dollyman1850 on Saturday 20th October 08:10
Hi Neil, interesting thoughts, thank you!
I considered using the leading edge bonnet vents for intake purposes, but I decided having maximum heat release when entering low speed heavy traffic is more important in my road application. Also filtering that air is difficult due to the space constraint. Last reason was that I don't like to have an air connection between the fixed location airbox and a bonnet which can open, it will be very hard to seal properly. The air coming from the front of the car is luckily also dense in that area, and allows me to use two large air filters behind the indicator area which can be fixed to the chassis, so stable and independent from an opening bonnet.
Could you elaborate why the airbox should not be fully sealed in your opinion? I would think that is precisely the purpose of it? Making sure only cool and filtered air comes in the engine? Possible back fires are hopefully taken care of by the two air intakes.
Opening the airbox upper side and sealing it with a rubber seal against the bonnet would be difficult for me to achieve, there is a relative movement between the two, and wear particles from rubber and bonnet inner surface should not be allowed in the engine. The extra volume created is minimal, the airbox is a few mm from the bonnet as it is.
But I am always willing to learn, so any thoughts are very appreciated!
The race car solution is to have a hole in the top of the bonnet, minimal filtration and a seal along an open side airbox. I don't know how they cope with rain, though ;-)
But proof and pudding, testing and measuring etc ;-) Will keep you all posted.
I considered using the leading edge bonnet vents for intake purposes, but I decided having maximum heat release when entering low speed heavy traffic is more important in my road application. Also filtering that air is difficult due to the space constraint. Last reason was that I don't like to have an air connection between the fixed location airbox and a bonnet which can open, it will be very hard to seal properly. The air coming from the front of the car is luckily also dense in that area, and allows me to use two large air filters behind the indicator area which can be fixed to the chassis, so stable and independent from an opening bonnet.
Could you elaborate why the airbox should not be fully sealed in your opinion? I would think that is precisely the purpose of it? Making sure only cool and filtered air comes in the engine? Possible back fires are hopefully taken care of by the two air intakes.
Opening the airbox upper side and sealing it with a rubber seal against the bonnet would be difficult for me to achieve, there is a relative movement between the two, and wear particles from rubber and bonnet inner surface should not be allowed in the engine. The extra volume created is minimal, the airbox is a few mm from the bonnet as it is.
But I am always willing to learn, so any thoughts are very appreciated!
The race car solution is to have a hole in the top of the bonnet, minimal filtration and a seal along an open side airbox. I don't know how they cope with rain, though ;-)
But proof and pudding, testing and measuring etc ;-) Will keep you all posted.
Edited by ephemera on Saturday 20th October 15:22
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