Larger side vent opening

[Thor maine]

Wow looks great! Those GM components truly make a better COBRA. As AC cars Heritage found , and use GM engines in genuine AC Cobra's . Long live the Bow Tie COBRA

[ERA2076]

Nice chassis - fully boxed with door bars and a backbone too. Did you happen to weigh it? FFR says their Type 65 chassis is 300 lb.

I would have guessed a little heavier than 2500. Did you dry sump to get the flat bottom? Are all of the components structural to bending moments in the chassis or are some of them to facilitate mounting aluminum panels?

I'll bet that thing is rigid as hell

Side note => I think Shelby listed the 427 @ 2500.

[ERA2076]

forgot to ask - is the track and wheel base stock Cobra?

x-chr

[mikeinatlanta]

John, I like how you are thinking outside the box.

Careful on sharing too much build info, it's just troll food. First you answer a couple of questions and before you know it, someone will be "concerned" about the how high your air intake is over the tarmac because they read something about it in a book once.

[ERA2076]

It has much to do with authors that have tested their stuff and taken the effort to document it. PM me your address and I will send you a couple of good ones. You could check out corner-carvers.com - a great place for you to start and it is free. You do read?

Wiki - Carroll moved to Europe where he befriended John Cooper. Driving a Formula Junior Cooper, he won his first race. After waning success in the Cooper cars, followed by a characteristically clear-eyed personal assessment that he lacked the ability to drive race cars at the highest levels, he returned to the United States and began working with Carroll Shelby and the Ford Motor Company on the GT40 Le Mans program. Smith oversaw the preparation on the cars that won the 1966 and 1967 24 Hours of Le Mans.

Carroll Smith Books . The Official Carroll Smith Site

Next time you are at the track, take your infra-red and measure the tarmac temp.

"I'm going to build a ram air system for my Cobra, but since I can't figure out any other way, I'll just pull in the hottest external air I can find and call it a day."

I had an idea for you - what about putting an air to water heat exchanger in your lower air intake tract and cooling the charge much the way Ford cools their inter-coolers.

Please share what "out of the box" thinking you see in Johns car?

x-chr

[mikeinatlanta]

Originally Posted by ERA2076

It has much to do with authors that have tested their stuff and taken the effort to document it. PM me your address and I will send you a couple of good ones. You could check out corner-carvers.com - a great place for you to start and it is free. You do read?



Next time you are at the track, take your infra-red and measure the tarmac temp.

"I'm going to build a ram air system for my Cobra, but since I can't figure out any other way, I'll just pull in the hottest external air I can find and call it a day."

I had an idea for you - what about putting an air to water heat exchanger in your lower air intake tract and cooling the charge much the way Ford cools their inter-coolers.

Please share what "out of the box" thinking you see in Johns car?

x-chr

Ok I get it. Your ego was bruised and your feelings were hurt when I rightly called you out in regards to your rude behavior. I’m sorry that I hurt your feelings, so do you feel better now? I also get that your behavior has gone from rude to asinine, to trolling, and now your just being childish. You have engaged in name calling, making up a quote to support your ego, thread hijacking, and more. When are you going to grow up and give it up? Maybe now you can use your contributor status in an attempt to have me banned?

Although I repeatedly stated that I do not wish to engage in a debate I have to wonder, would it make you feel better? I tell you what, I’ll go ahead and engage if you will just stop being a complete ass. Do we have a deal? I’ll assume so.

Let’s start with Mr. Smith. While I have a great deal of respect for the man, his books are filled with inaccuracies and unsubstantiated assumptions. His books are great for the masses with little to no subject matter knowledge (you), but they are not the end all from the omnipotent one. While I do not know the man, I expect that he would get quite the laugh out of people who feel they are experts simply by having read his books. Having authored a technical text book myself, I can’t imagine anyone thinking themselves an expert after reading it (that was a soft pitch, go ahead and take a shot).

Let’s play with your most recent attack. I lied. I only told you that you were correct in regards to air temps in an effort appease your sensitive ego and avoid the debate. Hell, contradicting the race car bible authored by the omnipotent Mr. Smith is heresy on a level that might get someone banned from the entire internet. So let’s explore this one. Have you done, read, or participated in any scientific research on the subject? Have you done any testing of any kind in an effort to either substantiate or refute common beliefs on the subject? Do you think that I would spend over 500 hours developing a ram air system having not at least done some basic testing?

Would you like to debate the subject on a new thread, or do you prefer the continued hijack of this one. Your call.

This is the system.

[ERA2076]

I am anything but an expert, at anything I try.

Love your duct.

x-chr

[mikeinatlanta]

Originally Posted by ERA2076

It has much to do with authors that have tested their stuff and taken the effort to document it. PM me your address and I will send you a couple of good ones. You could check out corner-carvers.com - a great place for you to start and it is free. You do read?



Next time you are at the track, take your infra-red and measure the tarmac temp.

"I'm going to build a ram air system for my Cobra, but since I can't figure out any other way, I'll just pull in the hottest external air I can find and call it a day."

I had an idea for you - what about putting an air to water heat exchanger in your lower air intake tract and cooling the charge much the way Ford cools their inter-coolers.

Please share what "out of the box" thinking you see in Johns car?

x-chr

I gather that your (and Carroll's) contention is that tarmac temps have a direct correlation to the surrounding air temps. It looks to me that we would first want to actually measure the air and see if there is any validity in the assumption. Assuming that we validate the assumption with a significant measured temperature gradient above the tarmac, we would then want to measure whether the mitigating factors such as cross winds and traffic turbulence have an effect on the temperature gradient. Assuming we do, we would then want to measure static temperature gradient recovery times (i.e. how long it takes for the air to reheat once the traffic is passed or crosswind stopped). Does this sound reasonable to you?

[Buzz]

Interesting stuff. Things like tarmac heat's influence on adjacent air temperatures are often taken for granted in the absence of the real world variables like those mentioned above. A simple measurement of external air temps at different heights taken on a moving vehicle and compared to static temperatures at the same heights would shed light. I'd be curious, but even then results would only be applicable to the conditions in that place on that given day.

Mike, I understand that you don't want to get into details and technicalities about your build at this time, but it's very intriguing stuff and people will naturally want to see and hear more (myself included). I hope you change your position on sharing more thoughts, details and photos.

[ERA2076]

I figured both this and the rad were dead issues. With 500 hours of development I assume you have it worked out but I am not aware of a modern sports racer that draws intake air from the bottom so "agree to disagree" is in play and it has worked for thousands of years.

My Mustang has the inter-cooler HE mounted at the bottom and without boxing, larger heat exchanger, dual fans, and manual switch we could not keep it cool. The ECU would pull timing and spoil the day. The air cleaner is boxed in the front fender and I pull air from the bottom thru the factory brake duct opening in the bumper cover. The last time I ran it, ambient was 95 and IAT1 would run as high as 118. It did not shut down, so we have made significant progress, but I am going to move the air intake to the head light or use a NACA duct on top of the fender next year.

One should keep in mind when Smiths books were written - to imply his work is not based in empirical data is simply not right. Katz, McBeath, and Stainforth all use emperical data, but are much more current publications.

The high down force configuration. I am interested in its integration to your bottom and front clip.

Morris built a full aero rocket, but was sent away

x-chr