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  #1  
Old April 1st 2010, 15:08
Plipton Plipton is offline
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IRS into 54 oval.... Track width problems

Hi All,

First post on here so hello to everyone

I am converting the rear of my oval to IRS but have found the rear wheels stick out too far so I need to narrow the trailing arms or buy some custom ones so that they tuck in under the arches.

So my questions for the forum....
  • What is the width of a stock early swing axle rear end ? (I don't have the original gearbox or axles etc to measure).
  • What is the width of a stock IRS rear?

Measurements (if possible) in mm and from drum to drum (wheel mounting face) please.

Nearest I have found on here is this post which gives me everything else I need to know.

Thanks
Plipton
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  #2  
Old April 1st 2010, 19:02
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NO_H2O NO_H2O is offline
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If you use a 6 inch wide wheel with amore inset (ie and 52mm vs a 23mm inset) would that clear things up?
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  #3  
Old April 2nd 2010, 09:03
Plipton Plipton is offline
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Yeah it would........ but (at the risk of horrifying everyone on here) I want to stick to wide 5 stud pattern - I have a set of CSP disks which cost the fat end of £2000 and (horror of horrors) a set of original Empis so I can't really afford to replace them for quite a while.

Unfortunately all the wide 5s I've seen have next to no offset so I need to narrow the diagonal arms but it's a bit hit and miss without knowing the original measurements.

Cheers
Plipton
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  #4  
Old April 2nd 2010, 10:07
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Steve C Steve C is offline
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Hi

I had Type 3, 4 stud rear brakes on a 1303, it was 1405 mm drum face to drum face.

I think the Type 3 brakes might add a few mm.

Steve
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  #5  
Old April 3rd 2010, 05:21
Plipton Plipton is offline
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Thanks Steve,

I have a pair of Type 3 drums to use as a comparison so should be able to use that as a starting point

Anyone out there got the same measurement for an early Type 1??

Ta
Rick
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  #6  
Old April 3rd 2010, 08:09
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NO_H2O NO_H2O is offline
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You could have Boulton Wheels make up a set of wheels. They take wide 5 centers and weld them to a GM steel wheel hoop and can do any offset. So you could do a 15x6 with 55mm inset.
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  #7  
Old April 3rd 2010, 10:54
Plipton Plipton is offline
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Boutlon Wheels sounds like a possible plan. Do they have a website? I can't find them on Google.

Thanks
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Old April 3rd 2010, 20:15
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I can find you some info.
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  #9  
Old April 4th 2010, 15:35
Plipton Plipton is offline
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Thanks
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Old April 4th 2010, 20:24
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Here is a link to the place I ws thinking of. It is Stockton Wheel not Boulton.
http://www.stocktonwheel.com/
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  #11  
Old April 5th 2010, 08:52
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Thanks for that. I'll give them a call and see what they can do. Looks like they may be able to make 15s into 16s which would look a whole lot better

Meanwhile, if anyone could measure their early SA bug rear end it would be much appreciated.
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  #12  
Old April 6th 2010, 13:54
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While you are waiting for your answer, I'm curious ... besides wanting to maintain the wide-five pattern, was putting an oval on an IRS chassis otherwise difficult?
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  #13  
Old April 6th 2010, 15:02
Plipton Plipton is offline
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No, not at all. Only the rear body mounts had to be lifted to accommodate the later shock mounts. I used a '69 semi-auto IRS chassis with a clutch tube welded into the tunnel.

However, that was the '56. Many years after being "restored" I found that it had been done badly with non-original parts. That's not to say it is beyond use but that the heater channels and valances are wrong for the year. I was tempted to get it all redone and then at the VolksWorld show last year I was offered a near-perfect 54 shell and chassis for 1/2 the cost of the repairs so I grabbed it.

The chassis I am now using is the '54 but with IRS diagonal arm mounts welded into the rear forks.

Here's some pics of the 56 on the 69 chassis....







Edited to say - oops just noticed the first pic is of the SA chassis

Last edited by Plipton; April 6th 2010 at 15:14.
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  #14  
Old April 6th 2010, 15:12
Plipton Plipton is offline
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The trouble is the offset on wide 5s is much less than the later 4 stud wheels so they don't fit under the arches without some work. I like the arches to look full so I need to get this spot on!
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irs, swing, track, wheel, width


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