jlparsons
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| posted on 3/4/08 at 06:05 PM |
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ram air
Does anyone know what speeds you need to be up to in order to get near the figures quoted for bike engine output with ram air? I'm wondering if
sevens ever reach those sort of speeds and hence if i can be bothered. Anyone done any testing?
If people have bothered, what sort of scoop/duct do you tend to use, and where on the car is this most effective?
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
approval, terms and conditions apply. Apply only to affected area. For recreational use only. All models over 18 years of age. No user-serviceable
parts inside. Subject to change. As seen on TV. One size fits all. May contain nuts. Slippery when wet. For office use only. Edited for television.
Keep cool; process promptly.
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lsdweb
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| posted on 3/4/08 at 06:24 PM |
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I've heard a figure of 120mph quoted although that could be totla bull!
If it is true - don't bother!
Wyn
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I love speed :-P
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| posted on 3/4/08 at 06:40 PM |
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Some info here
http://www.sportrider.com/tech/146_9508_ram/index.html
http://www.sportrider.com/tech/146_9910_ram/index.html
http://www.sportrider.com/tech/146_9912_ram/index.html
Don't Steal
The Government doesn’t like the competition
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snapper
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| posted on 3/4/08 at 07:00 PM |
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Cold air is always denser than warm so ducted air from the front will be a. denser and be have some extra pressure than filters out the side.
On my CEC i have bike carbs and a pipercross, when funds allow i will get one of there airboxes and pipe cold air from the front or a bonnet scoop.
every little helps and cold air makes a lot of difference compaired with hot under bonnet stuff
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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jlparsons
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| posted on 3/4/08 at 07:02 PM |
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Ok, so that one can go on my post-sva "when i can be ars3d" to-do list. 
Thanks folks!
Any resemblance to real persons, living or dead is purely coincidental. Some assembly required. Batteries not included. Contents may settle during
shipment. Use only as directed. No other warranty expressed or implied. Do not use while operating a motor vehicle or heavy equipment. Subject to
approval, terms and conditions apply. Apply only to affected area. For recreational use only. All models over 18 years of age. No user-serviceable
parts inside. Subject to change. As seen on TV. One size fits all. May contain nuts. Slippery when wet. For office use only. Edited for television.
Keep cool; process promptly.
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kevmcdo
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| posted on 3/4/08 at 08:12 PM |
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The effect is not only good but can also be very negative on a bike engine in the wrong conditions. I had twin ram intakes on my GSXR 600 and 750 a
few years a go and it would cause carb icing on cold mornings resulting in loss of power and in extreme conditons stalling. If the bikes were used
during the winter I would have to blank one off thus restricting the cold air intake and some of the performance ( noticable at higher speeds). My
current bike is a zx12r with fuel injection and is not affected in any weather conditions. The speed/wind effect required to make a perfomance gain
noticable is well on the way to sending you to jail and well out of reach of more standard 7 style cars.
Hope this helps 
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eznfrank
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| posted on 3/4/08 at 08:16 PM |
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This is currently on my list if things to figure out too?? So would you say a sausage filter in line with bonnet scoop with a cold air feed would be a
good way to go.
Will be running a ZX12 and seem to remember reading on Hellfire's site somewhere they had heating issues?
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Hellfire
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| posted on 3/4/08 at 08:27 PM |
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quote:
Originally posted by eznfrank
This is currently on my list if things to figure out too?? So would you say a sausage filter in line with bonnet scoop with a cold air feed would be a
good way to go.
Will be running a ZX12 and seem to remember reading on Hellfire's site somewhere they had heating issues?
We did indeed have overheating problems which were solved by a combination of water wetter and bonnet ducting. Now she only reaches the extremes when
tracking, and then she's only brought in for the Oil to cool, which we monitor with a Spa Temperature/Pressure Gauge.
Steve
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kevmcdo
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| posted on 3/4/08 at 08:27 PM |
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The zx12r engine runs fairly hot all the time, for the size of engine the oil capacity was kept low to reduce weight. Even in the bike when riding
through town the fans kick in very quickly compared with say a blackbird engine.
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BenB
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| posted on 3/4/08 at 09:51 PM |
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I think this has been looked at before.
I think the general consensus is the ram air effect kicks in well after your standard 7 has hit the aerodynamic brick wall!!!!!!!
Good on a 200mph bike though (I was told it starts happening at 130mph+ as a rule of thumb)
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nitram38
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| posted on 4/4/08 at 04:57 AM |
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I am using the standard airbox which will have a small plenum added to the filter opening with 2 X 3" tubes sticking out.
My engine is mounted the same as a bike at the rear end of the Motaleira.
From either side of the seats there will be two NACA ducts (one either side of the car) piped in 3" flexi to the airbox.
I believe that using the original airbox is a bonus and the ducting can only help.
Because a rolling road cannot simulate airflow as the car is static, I have invested in a power commander and an inovate lambda gauge.
This will enable me to tune the car in the "real" world, while I am actually driving.
 
Rescued attachment fuel filler 4.jpg
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Hellfire
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| posted on 4/4/08 at 08:28 AM |
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Like kevmcdo says, you'll not be able to reach the speeds required to benefit from ram air.
Phil
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hughpinder
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| posted on 4/4/08 at 09:43 AM |
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If you use a forward facing bonnet scoop, don't forget to ensure that the air flow under the bonnet is retained. The air flow through the
radiator will be reduced if too much air comes in that way 'cos you get the same pressure in front and behind the rad, rather than just high
pressure at the front only.
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larrythelathe
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| posted on 4/4/08 at 09:50 AM |
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surface of the intake
if you had a bigger input volume of air and focused it down to a smaller diameter. this will have the same effect as going faster.
Its normal to see this on big sports cars.
The trick is getting the fueling right cost loads of money
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