M~Factor

Hello,


First time posting in the AMG section.


I am in need of C63 with OEM vented hood information. I recently bought a 2013 C300 and would like to do a functional vented hood mod. I already have a set of replica vents, now I just need to cut a hole in my hood to make it functional.


What I need a favor for is the dimensions of where the 2 vents will go.


1. how far away from the outside edge of the hood
2. how far away from the front edge of the hood
3. how far apart are the 2 vents


Thanks in advance.

Brunty88

Very crude drawing but should help

Brunty88

Can you share some info on the vents you have

M~Factor

that is awesome. thank you!!!

Cli63

On this topic, are these vents actually functionable or just aesthetics? Considering getting vents for my hood also.

INS1GNIA

A good thread to see how the hood vents look underneath - https://mbworld.org/forums/c63-amg-w...-question.html

Diabolis

They are functional, but not in the way MB would like you to think... their function is to get your engine bay dirty. There is no heat extraction from the engine bay itself. All you have to do is look at the size of the opening under the hood and the positioning of the same to figure out that they are cosmetic.

Here are some functional heat extraction vents:





... and here's what the C63 hood vents look like:

Jasonoff

Don't the ports sit in the open space between the air inlet ducts to help draw air through the coolers and exit out the hood? Designed to help lower coolant/oil temps rather than engine bay temps.

Diabolis

Yes.. in the same way that the red aluminum intake spacers produce extra horesepower.

A ~4 square inch opening in the hood at that location is not going to extract any heat. It may at best increase the total available area for air entering the engine bay to escape by 0.02% - which unfortunately happens BEFORE said tiny amount of air goes past the engine, which would actually result in a slightly hotter engine block. It's a gimmick, pure and simple. Furthermore, the only way those are actually going to work is if there is a low pressure area on the hood over the top portion of the vents, which is questionable. A properly designed, vented belly pan is goign to be much more effective. I remember the vented belly pan under the horizontally mounted oil cooler in the 44O package and the little rubber flap in front, whose only purpose is to create a low pressure area over the vents so the hot air would escape through those instead of simply sliding past the openings.

An easy test would be to scotch-tape a couple of pieces of paper over the vents on top of the hood, leaving a little bit of slack in the paper and then drive the car at highway speeds. If you see the paper bubbling up, there is some airflow. If it doesn't move, just flaps around or gets sucked down into the vent openings, they do nothing.

BLKROKT

What he said ^

We talked about this a lot in this thread starting about here: https://mbworld.org/forums/c63-amg-w...ml#post6900720

Some good videos and math and stuff there.

Still wondering if I can get through my hood with my Dremmel...... might try that this weekend, my HID project has me frustrated with fine detail work for awhile....

Jasonoff

I didn't claim they worked. Just that their function was to help create a flow path through the coolers forcing air out rather than lower engine bay temps.

I had this hood on my S2000 track car.



Didn't do much for IAT but dropped coolant and oil temps. Adding hinge spacers to raise the back of the hood by the windshield is what lowered IAT and overall engine bay temps.

Diabolis

Tks Jim... I somehow missed that entire brake cooling and engine heat extraction thread!

Diabolis

Correct. Look at the "flap" sticking up in front of the hood opening - that is what creates a low pressure zone over the vent and sucks the hot air out... not to mention the size of the vent itself. The positioning of the two "nostrils" on the BS / 507, their size and the shape of the opening on top of the hood would suggest they do nothing useful.

BLKROKT

Dude, I love your new signature. I took the "bus stop" chicane at Watkins Glen like that, passing someone sideways over the curb going in on the outside of the right-left-right. That guy happened to be an instructor, and told me that "you shouldn't be able to go that fast in that car" and that I shouldn't come back until I had a fire extinguisher, full suit and a HANS device. Good times.

Diabolis

LOL. I've inadvertently pulled off similar stunts, and - whaddyaknow - ended up with a car with a roll cage, plumbed-in fire extinguisher, race suit and a HANS device.

I've only been to the Glen once. many moons ago and I drove only one 20 minuite shakedown session in a "green" group in someomne else's car... so I've never even had a chance to learn the track. Am going back there this May though with a local ChumpCar team, which ought to be fun - apparently last year there were well over 100 cars on the grid! At the Canadian ChumpCar races we get ~30 cars on the grid... the Glen is pure carnage in comparison. Having never driven there (for all intents and purposes) before, it ought to be fun!

Cheers,
Doug

BLKROKT

Jeez that's a ton of cars on track. That might be fun to watch if I'm not traveling. Not a bad drive from here either. I'm there my first track day of the year April 24-25 with NASA. (still need that suit and now a new helmet too)

BTW - sorry for the mini hijack here OP - what do you think of that heat extraction thread? Got my 44O in now, but I still want to get more hot air out through the hood, maybe try to create some flow under there too. If you have any thoughts on how to best execute on that, your input would be valuable.

Diabolis

Yup... I'm told the Glen is a carnage. IIRC this year is on May 26-28. I should be out with one of two teams, either a red E30 (#61) or a black Honda Civic (#18). Not sure yet if we'll find enough drivers in either team, but I am certainly hoping to make it.

As for heat extraction... a belly pan / skid plate with some louvers would probably be the least expensive and easiest thing to try, followed by a hood, again with some louvers, and last but not certainly not least, the indented area on the front fenders (where the "6.3 AMG" decal sits) could be a perfect spot to open up as the bulging wheelarches in front would almost certainly produce a low pressure spot there and you wouldn't get too much rain and dirt on the motor... I just don't know whether that's in front of the firewall or behind. We can revive the heat extraction thread that I originally missed.

Sorry for the thread hijack everyone.. back to regular programming.

Jasonoff

You may know Frank Ewald? He did some chump car races with the #998 miata.

Diabolis

No, I don't know him. I only started Chumping last year and I don't remember a #998 car (and AFAIK there were only two Miatas)... but the name sounds familiar for some reason. Any idea if he went to any 6th Gear or EA track events at Mosport?

Sorry for the hijack everyone.

ev4530

Bring out the thermal cam!

Jasonoff

This question was already answered in the 2nd post. This thread just a chat now, so you're good

http://www.motoiq.com/MagazineArticl...s-at-CTMP.aspx

I've been going to his track days for 17 years.

Were you involved with CTCC at all? Recognize the name Nabeel Malik? Drove the #79 civic for a while then an RSX for a few seasons. I put some serious wrench time into that car...

A Doug into pcars from Mosport just sounds familiar. But I'm old and my memory is sketchy.

Diabolis

Not directly involved in CTCC *yet* (I was on P.J. Groenke's crew when he was competing in CTCC)... but if the stars align and we manage to get MBNA on board with a partial sponsorship deal of some kind, there just may be two CLA45s on the grid in 2018 - this time I'd be driving one of them. In terms of officially sanctioned competition, I've only done a handful of CASC-OR Solo 1 events at Mosport six years ago.

I have been involved in various track events for 15+ years myself, mostly with BMW CCA Trillium, PCA UCR and SOCCI in addtion to various open lapping events. As for a Nabeel in a #79 Civic, I seem to remember someone by that name but in CASC-OR Touring GT some 10+ years ago when Perry Ianuzzi (Mad Macs #223 Nissan) and P.J. Groenke (don't remember which car he had back then) were also in GT Touring. I ain't young either so my memory is sketchy too.

ramony98

Hi together,
Are these very exact meassurements for the air vent conversion?
I need to know because this week I have my bonnet converted at a body shop.

Thank you
Ramon