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#Post#: 8313--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: NewbieNick Date: February 26, 2023, 11:40 am
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Lovely job really well finished
#Post#: 8361--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: Glynn Date: March 8, 2023, 10:59 am
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After the AGM / Builders meet at Gaydon I realised that I needed
to add some gearing to my steering. Here's what I've come up
with.
A 10 tooth pinion driving a 20 tooth internal ring gear, so 2:1
ratio.
Thanks for all the inspiration Stefan.
#Post#: 8371--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: Glynn Date: March 10, 2023, 8:58 am
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Another issue identified at Gaydon was engine cooling. Here's
my solution.
I'm also planning to make a duct to direct cooling air from the
grill to the engine cooling fan inlet.
#Post#: 8374--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: ian.lang Date: March 10, 2023, 1:30 pm
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You have been busy.
Very neat 2:1 box solution, cutting those internal gears and
keeping the necessary clearance may be a challenge! Are you
going to have a go 3D printing it?
I also picked up on the steering load issue, but will keep it
for a mk2 mod over winter months. I was thinking a chain and
sprocket but wont be as compact as your solution.
Will also be interested in how you progress with the cooling
issue - I have a way to go but was thinking of not closing the
boat tail, although there are a number of rear profiles I could
go for.
All the best.
Ian
#Post#: 8445--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: Glynn Date: March 20, 2023, 7:15 am
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Just finished my engine cooling duct. Managed to come up with a
design that allows me to get away with one adjustable mould
tool. By making it in 2 concentric halves I can adjust the
width to fit between engine and body sidewall.
#Post#: 8446--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: StefanN Date: March 20, 2023, 12:49 pm
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Impressive.
#Post#: 8681--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: Glynn Date: April 29, 2023, 5:03 am
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All ready for my first outing at Stretton Karting. Finally get
to see if it actually works. Roll on Wednesday.
#Post#: 8764--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: Glynn Date: May 15, 2023, 5:25 am
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Lessons learned from Stretton 2023.
1. Don't underestimate the importance of the front suspension /
steering geometry.
2. Don't underestimate the structural loads generated in the
front suspension / steering, particularly when driving over the
tyre wall !!
3. Throttle control needs to be smooth and positive through the
full range. Mine was not.
My front axle pivots were no where near strong enough, allowing
the axles to move and eliminate all the toe-in. Now have
significant torsional bracing.
Twist in the front spring attachment had allowed the front axle
to rotate, removing all the castor angle. Additional control
rods to the top of the axle now control the castor and
facilitate fine adjustment.
A complete change of cable and linkages has sorted the throttle
issues.
I've also added dampers to the front suspension, for
authenticity not handling. Many thanks to Mark for the laser
cutting.
Roll on Star & Garter so I can have another go !!
#Post#: 8765--------------------------------------------------
Re: Austin 7 Ulster - Build Journal
By: Jimr1999 Date: May 15, 2023, 6:01 am
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Looking good Glynn, hope that the Star and Garter is a great day
for you, wish I could join but away 😁
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