Quad pedal race car - refurbish and improvement [ I hope ]

[stormbird]

Or tap the existing one out. The taps aren't cheap but you'll likely use them more than this one time.

My engineer does have the taps needed. However his words were ' there is no way I am putting my £1k each taps in that BB shell ! '
That is probably a no then

My gut feeling is I need to master welding these rather than spend time or money rescuing this one ?

Paul

 

[Popshot]

Somewhat cheaper here £73.40 delivered.

Bottom Bracket Taps - BSA (PAIR) - webbline

1.370" x 24TPI - 34.8mm. Right and Left Handed - 22mm square drive

www.webbline.co.uk

Or if you fancy your ability to make a holder from some tube and a bit of weld. £39.25 delivered

https://www.aliexpress.com/item/1005004150508468.html?algo_exp_id=b5a60ee8-d599-4e09-861c-fb5073c1bdc0-3&pdp_npi=4%40dis%21GBP%2162.90%2132.71%21%21%2174.09%21%21%402103888a16984136364731383e4f2b%2112000028202589826%21sea%21UK%211891404558%21&curPageLogUid=5k18l4JGLGzu

 

[stormbird]

Somewhat cheaper here £73.40 delivered.

Bottom Bracket Taps - BSA (PAIR) - webbline

1.370" x 24TPI - 34.8mm. Right and Left Handed - 22mm square drive

www.webbline.co.uk

Or if you fancy your ability to make a holder from some tube and a bit of weld. £39.25 delivered

https://www.aliexpress.com/item/1005004150508468.html?algo_exp_id=b5a60ee8-d599-4e09-861c-fb5073c1bdc0-3&pdp_npi=4%40dis%21GBP%2162.90%2132.71%21%21%2174.09%21%21%402103888a16984136364731383e4f2b%2112000028202589826%21sea%21UK%211891404558%21&curPageLogUid=5k18l4JGLGzu

Thanks for this , i will put it on the back burner ....
It may still be a goer who knows ?

Paul

 

[stormbird]

Ok so why no updates for 20+ days , well things are progressing down hill at a rapid rate !

I realised the BB solution I was working on would require 4 vertical inside corner welds as well as some complicated joints being cut and the welds were way beyond my skillset.
Also every where I look I see lots of work.
The steering components need a thorough overhaul then it became apparent the kingpins had reached the end of their service life there appeared to be no Centre point angle in them and an attempt at adding Ackerman had not gone well [ or worked ! ]

The M8 bolts should be in the welded over holes in the end where it is stronger.
So I need to prioritise work into :-
a) needed for safety or for it to work - on the road as soon as possible
b) can I improve anything I work on for a)
c) nice to have but not essential

So it is a) all the way.
Assessment as it stands:-
new BB mount
new pulley mount
new kingpins with caster and centre point
investigate why ALL wheels don't spin freely
mount BB7 calipers

c) things now on back burner
lower seat
replace Samagaga differential with a free wheel differential
attend to body work

So this is the new simpler BB mount , I can weld into the car , it needs a front brace adding however I have the first part welded.

There are now 2 right angle flanges welded on 3 sides at both ends to the tube the BB stem is welded to.
They should be straight forward to weld to the chassis , as they can be reached from the top and underneath with no need to weld the vertical side [ I think ]

So all's rosy with the world , so I though.....

I had been measuring the BB position from the plan it said 10" from the front of the front cross member and I nailed it.
Out of curiosity I measured the BB centre to the seat front and came up with 25" that did not ' feel ' right , I turned around and measured the Python [ different seat ] it was a shade OVER 29" yikes I can't fit in that. Especially as the more laid back you make the seat for racing the longer that distance needs to be.

​

Ok out in the cold dark garage with the plan and a tape measure , my car DOES NOT match the plan !

where measured	plan	car
front x member to rear BB x member = close	30"	28.2"
front x member to rear front seat mount = where's my 4" ?	46"	42"
w/b = not really close	52.8"	49.5"

 

[stormbird]

So all's rosy with the world , so I though.....

I had been measuring the BB position from the plan it said 10" from the front of the front cross member and I nailed it.
Out of curiosity I measured the BB centre to the seat front and came up with 25" that did not ' feel ' right , I turned around and measured the Python [ different seat ] it was a shade OVER 29" yikes I can't fit in that. Especially as the more laid back you make the seat for racing the longer that distance needs to be.

​

Ok out in the cold dark garage with the plan and a tape measure , my car DOES NOT match the plan !

where measured	plan	car
front x member to rear BB x member = close	30"	28.2"
front x member to rear front seat mount = where's my 4" ?	46"	42"
w/b = not really close	52.8"	49.5"

Seems I am a #1 t*t , I enlarged the plan till the 20" wheels were @ 1/4 scale 5" , this morning causally measure the wheels with Kojak racing slicks on to find they are 19" a good 5%+ error and with I suspect some printer errors we have a car not matching the plan.

So I now have a dimension-ed drawing and will be back at the measuring later on today with a bit of luck.

This also probably means the BB is in the wrong place and will have to be hacked off and re-welded DOH

Paul

 

[Popshot]

Just to throw another curve ball but can you assume the plans are perfect?

 

[stormbird]

Just to throw another curve ball but can you assume the plans are perfect?

Popshot in this case yes [ mostly ] it seems I was also sent a 1 page PDF that had dimensions on it and the car was built from them , I was offered the CAD drawings however turned them down as a step to far !
I realised I did not print the dimensioned PDF out to 1/4 scale as it did not show the wheels and so there was no ground plane.
Next up print it out and confirm the dimensions.
At first glance it would appear I have the BB about 5/8th's of an inch to rearwards , do I correct this ?
Paul

 

[stormbird]

Ok finished new BB mount by adding a strengthening brace

Front is to the left

In situ looks good , realised it would be much easier to paint it in the house [ where it's warm ] than in the garage.
So need to hunt out some primer and some gloss paint.

Yes I still need to weld it to the chassis , however that is only both ends and I can keep the paint away from them and touch them up later.

Paul