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Learning how to build Lotus Seven replicas...together!
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 Post subject: Re: Project Widow Maker
PostPosted: September 9, 2010, 5:27 pm 
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Muscletrike wrote:
horizenjob wrote:
Be careful with a CO2 tank. If you are using a regulator to reduce pressure before your tank, it will get most of the cooling. If you go direct to your tank and the outlet gets frosted shut, it will explode in fairly short order. It the tank has much volume of CO2 in it when it goes, there could be "issues"...

The tanks are also heavy. It needs to be mounted so that it doesn't come loose in an accident, so safe for something like 20g's.
Does anybody know how those guys http://www.designengineering.com/catalog/cryo2-system-components solve those issues?
If you design your own it's up to you. But their unit might blow up too if the exhaust got plugged. I'd certainly ask them how long that tank of CO2 lasts in one continuous blast.

There's a little error in their ad about it,
"The CryO2® system uses liquid carbon dioxide (CO2), stored at 80 degrees below zero (Fahrenheit), to super cool intake air, ...."

The temperature right at the small area where CO2 evaporates from a liquid to a gas is at ~-80°. That tank is not insulated to store CO2 at -80°. When CO2 is stored at high pressure it can still be a liquid at higher temperatures. We used to have a very large CO2 tank for testing equipment to -72° F. The Co2 was stored in the tank at 300 psi with a refrigeration unit to cool the tank to ~0° F. Can you imagine the equipment it would take to cool & keep that CO2 car cylinder at -80°? :mrgreen:

I found this at http://www.kegkits.com/Merchant2/mercha ... Code=HPREG
"Note: Liquid CO2 should not be stored in the trunk or passenger compartment of any car. The temperatures inside a car can easily cross 120 degrees F and any full CO2 tank will vent (loose its charge) at these temperatures."

My note, the tank CO2 pressure would exceed the safety valve set point built into the regulator.

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Last edited by olrowdy_01 on September 10, 2010, 10:40 am, edited 1 time in total.

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 Post subject: Re: Project Widow Maker
PostPosted: September 10, 2010, 8:52 am 
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I started the hood spoiler yesterday.

I cut the hood so it clears the wipers.
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Check the top curvature
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Fabricate some bracket to hold it in place
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And glass it
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 Post subject: Re: Project Widow Maker
PostPosted: September 10, 2010, 9:20 am 
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Location: Kamloops, BC, Canada
Muscletrike wrote:
horizenjob wrote:
Be careful with a CO2 tank. If you are using a regulator to reduce pressure before your tank, it will get most of the cooling. If you go direct to your tank and the outlet gets frosted shut, it will explode in fairly short order. It the tank has much volume of CO2 in it when it goes, there could be "issues"...

The tanks are also heavy. It needs to be mounted so that it doesn't come loose in an accident, so safe for something like 20g's.

Does anybody know how those guys http://www.designengineering.com/catalog/cryo2-system-components solve those issues?

You could always use a CO2 fire extinguisher with a remote operated valve of some sort.
Kristian

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 Post subject: Re: Project Widow Maker
PostPosted: September 10, 2010, 10:47 am 
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Muscletrike:
I notice that the buggy body that you are using is the same make as the one on my dune buggy (picture posted on another page). Do you know what the manufacture called the body kit? I remember that it had the word "fun" in the name. Something like "Fun buggy". It has very wide fenders and a nice area in the back that covered the VW engine. Although the turbo-Corvair I'm using sticks out a little. :twisted:

One thing I found out is that the headlights would move left or right over time due to vibration. I never could get the single hold down bolt tight enough to stop that. If you are going to use bug eye lights you might want to roughen up the fiberglass area where the bottom of the light contacts the fiberglass.

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Website: http://projekt.com/locouki/


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 Post subject: Re: Project Widow Maker
PostPosted: September 13, 2010, 10:35 pm 
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thats an awesome build. and I thought I was smart for taking a GST for a midengine build. Id love to have a low weight AWD to play with. I agree with the other evo guy, I think you're going to have a lot of twist in the rear with that kind of power available.


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 Post subject: Re: Project Widow Maker
PostPosted: September 19, 2010, 8:10 am 
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olrowdy_01 wrote:
Muscletrike:
I notice that the buggy body that you are using is the same make as the one on my dune buggy (picture posted on another page). Do you know what the manufacture called the body kit? I remember that it had the word "fun" in the name. Something like "Fun buggy". It has very wide fenders and a nice area in the back that covered the VW engine. Although the turbo-Corvair I'm using sticks out a little. :twisted:

One thing I found out is that the headlights would move left or right over time due to vibration. I never could get the single hold down bolt tight enough to stop that. If you are going to use bug eye lights you might want to roughen up the fiberglass area where the bottom of the light contacts the fiberglass.


Yes, your right this is the same body.
I have no information about it.
The only thing I know it is that it's a long wheelbase and it was cheap.

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 Post subject: Re: Project Widow Maker
PostPosted: September 19, 2010, 8:16 am 
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I received most of my new fuel system.
It should be safe for around 600 HP.
The weakest link being the Bosch 044 fuel pump.
The only thing not in the picture is the AEM big bore fuel rail.
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 Post subject: Re: Project Widow Maker
PostPosted: September 22, 2010, 7:19 am 
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I received the tubular bumper that I got on ebay for next to nothing.
It is from an ATV and fits pretty well.
I was just test fitting it until I figure out how to mount it.
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Imagine two off road lights in the center hoop.

I am now done with the mods on the hood and I glassed the hood and the fenders together.
The fiberglass is now one piece that I can remove in 2 minutes.
Image
Image

I pulled the body off to work on finishing.

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 Post subject: Re: Project Widow Maker
PostPosted: September 24, 2010, 3:30 pm 
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Got my wheels:
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Got my tires:
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My friend Tango came yesterday and help me with some fiberglass grinding.
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Did I mention that he is a great photographer?
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I really like the spare on the roof look.
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I will be mounting the new wheels on Saturday.
More pictures to come...

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 Post subject: Re: Project Widow Maker
PostPosted: September 24, 2010, 4:11 pm 
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You know who your real friends are when it comes to grinding fiberglass :?

I like the look of the serious off-roader with the spare on top the roll cage too.

I am really enjoying your build as I love it when people take the "locost" idea of car building and do their own thing.
I do appreciate ones who want the Lotus 7 look too, but I think some builds would be better if they didn't try to keep the 7 style.

Keep up the great photo progress reports! 8)

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 Post subject: Re: Project Widow Maker
PostPosted: September 25, 2010, 11:57 pm 
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I didn't know it was going to be an off-roader. I thought it was gonna be a street buggy.


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 Post subject: Re: Project Widow Maker
PostPosted: September 26, 2010, 10:51 am 
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Flipper_1938 wrote:
I didn't know it was going to be an off-roader. I thought it was gonna be a street buggy.

It is a street buggy with an off road look.
I want it to be as unassuming as possible (cops) somehow fun and toy like.
But when you floor it... SURPRISE.
I chose those tires because they look off road but have great road manners.

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 Post subject: Re: Project Widow Maker
PostPosted: September 27, 2010, 9:31 pm 
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Fabrication.... I love fabrication.
Yesterday I started the body hinges.

I started with rear strut tower bar brackets.
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Then place a tube on top of them.
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Weld.
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Cut.
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Voila two bottom brackets.

Next the top brackets.
I used old Mini cooper shocks brackets that I had laying around.

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Cut, drill and sand blasted.

Image
Here you go

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 Post subject: Re: Project Widow Maker
PostPosted: September 28, 2010, 9:26 pm 
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Some more pictures from today.

Finished hinge.
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Both hinges on the chassis.
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The body is back on.
Notice the new stance.
Image
Image

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 Post subject: Re: Project Widow Maker
PostPosted: September 29, 2010, 2:13 pm 
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I found out yesterday that I needed a little more clearance on the front fenders.

Hummm???

Old skateboard wheels.
Image

New body mount spacer. :yay:
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