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Learning how to build Lotus Seven replicas...together!
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PostPosted: July 5, 2022, 9:21 pm 
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Joined: September 30, 2020, 11:44 am
Posts: 42
Location: Eastern Oregon
Starting planning on my 7 project. It's going to be based on a 22r Toyota pickup. I feel like this motor is a little tall for some of the "standard" frames out there. I'm most likely going to design my own frame to be able to more accurately fit the axle, engine, etc.

So the question is; about how much height is there between the top frame rail and the top of the hood? I realize this will vary by build, and am not opposed to cut-outs/bulges, but would like to keep that to a minimum.


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PostPosted: July 6, 2022, 12:03 am 
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Joined: March 19, 2011, 10:22 am
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Location: Holden, Alberta, Canada
On my builds I've increased the frame side height by 2" or more so as not to have a bulge in the hood.

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PostPosted: July 6, 2022, 4:42 pm 
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Joined: July 7, 2011, 12:17 am
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Location: Oregon City, OR
I recently did a rough scan and the hood height at the rear of the engine came out to be roughly 8 7/16" above a 15" frame height. The hood barely clears the engine (Miata 1.8L). I think it turned out decently proportional.


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Last edited by RTz on July 6, 2022, 9:26 pm, edited 1 time in total.

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PostPosted: July 6, 2022, 7:48 pm 
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kabuku6 wrote:

So the question is; about how much height is there between the top frame rail and the top of the hood? I realize this will vary by build, and am not opposed to cut-outs/bulges, but would like to keep that to a minimum.


I have the engine bay frame depth in my signature for various seven types. Originals are known for dragging a sump on speed bumps. Decide on how much GC you want to determine which size chassis to build where the engine has at least a 1/2 inch clearance to move around under load. Figure out how high to make the upper rail before cutting and welding the sides so it will follow the belt line. If you stick to Rtz bonnet to rail height ratio, it should turn out great.

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Frame L x cockpit W x eng bay HT (w/o hood/bonnet/cowl)
Lotus Super Seven: 115 (no spare) x39x7.25
Tiger Avon: 114x40x13.3-12.6
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McSorley “442”122x46x14
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PostPosted: July 11, 2022, 7:16 am 
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Joined: September 30, 2020, 11:44 am
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Location: Eastern Oregon
Thank you! RTz I do like the proportions of you car. Did you base it off of a "standard" frame?

And thanks for that info MiataV8. Will keep that in mind moving forward


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PostPosted: July 11, 2022, 6:23 pm 
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Joined: July 7, 2011, 12:17 am
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Location: Oregon City, OR
kabuku6 wrote:
Did you base it off of a "standard" frame?


Thanks, it's my own contrivance for the purposes of fitting a large person (6'-5' w/14 shoes) while trying to emulate the proportions of a modern Caterham. See overlay with a Book frame below.

• Overall Length: 1/2" longer
• Cockpit: 2" wider
• Front Frame Rails: 2" taller
• Width across the nose: Approx. the same
• Scuttle: Begins 3" rearward
• Firewall: 2" forward
• Pedal Box: 5" wider
• Tunnel: 3" narrower
• Wheelbase: 94.25"
• Bottom of oil pan: 1" below frame

I see you're in Eastern Oregon. If you ever make it to the Portland/Oregon City area hit it me up.


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PostPosted: July 11, 2022, 11:06 pm 
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Joined: September 30, 2020, 11:44 am
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Location: Eastern Oregon
I was planning on designing my own frame to fit the donor axle and the engine specifically. But I wanted to make sure the car looked proportional. Yours looks great. Thanks for those measurements and the drawing overlays to give me an idea of what you did.

I don't make it west as much as I once did when I was running businesses. But I may have to take a leisure ride out there before the rain starts and hit you up.


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