The Lotus Cars Community banner
1 - 6 of 6 Posts

·
Banned
Joined
·
938 Posts
Discussion Starter · #1 ·
Hi.
Curious if I buy more modern lotus wheels not meant to fit my front end of my 89 lotus esprit non se, such as the S4 wheel. I realize it must be bored out to 60mm.
What is the hubs actual size? What sort of clearance has to be achieved?
Do you just bore it out to 60mm and the wheels fit fine?
:facepalm
 

·
Banned
Joined
·
938 Posts
Discussion Starter · #3 ·
You get the front wheel spigot diameter bored to 60mm. the hub spigot is slightly smaller to account for tolerances. The hole has to be concentric, since the wheels are hub-centric, they rely on the fit to that hub spigot to hold the wheels concentric to the hub. You will need a machinist who can do that part correctly on a CNC mill. Not a hole saw!
Hi. Thanks for responding.
I was wondering if the spigot or the wheel made had the minus or positive tolerance.
I have never read that!
I am a Machinist. Manual all the way.
And.....what size is the Spigot?

No need for a CNC whatsoever.
Mike
 

·
Banned
Joined
·
938 Posts
Discussion Starter · #4 ·
After I buy my wheels, Im going to Home Depot to buy a Hole saw!
It musst fit! ! ! ! ,
 

·
Banned
Joined
·
938 Posts
Discussion Starter · #7 ·
The hub spigot is thin already, taking 2mm out of it could seriously weaken it. However taking 2mm out of the wheel does nothing to the strength.

Out of curiosity I just measured my hub and wheels.

My hub spigot is 59.97mm at the largest point, and my V8 front wheel bore is 60.20 as machined to fit my hub spigots (measured with inside bore telescoping gauges). They fit without any issue. You do need a generous chamfer on the wheel bore to fit though. The root of the hub spigot has a fillet.
Hi.
So if I put a. 250 chamfer on the the back of the wheel it will seat properly?
Yes?
 

·
Banned
Joined
·
938 Posts
Discussion Starter · #16 ·
I haven't seen many lathes that can handle an 18" wheel, and hold it without denting it.

There are many ways to do it, I was just mentioning the way that I did it.
Thanks for All the info.
VulcanGrey. Its not a problem whatsoever to machine and hold the wheels.
Best thing to do to aviod warping or denting the wheel is to use aluminum or brass shims on the teeth.
You really do not need much holding pressure for small cuts like what is required. You have to keep your rpms low so the wheel doesnt fly off.
Ive machined my 928 wheels without any drama.

Btw my Lathe at work, has a 6.5 foot swing.
And no, I wont be using it to machine the wheels.
Mike E.
 

·
Banned
Joined
·
938 Posts
Discussion Starter · #17 ·
Hit up Quadcam for his spacer specs. You won't be sorry. Fits well and flush too. S4 wheels in my opinion are too sucked in anyways. Get the spaces and no boring required.
Hi.
I just cant afford the deal.
Imgoing through an awful custody battle.
ThankYou though.
Mike.
 
1 - 6 of 6 Posts
Top