Healey Sports Cars

mods & upgrades for Healey (Nash, Austin, or Jensen) cars, including engine swaps

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pfordt
Patrick Trumbull
1/2 way betwixt Sacramento and Lake Tahoe
(6 posts)

Registered:
08/27/2009 03:24PM

Main British Car:
1957 bn-4 5.7 sbc

switching from 1/4 to 1/2 elliptics
Posted by: pfordt
Date: June 09, 2011 12:59AM

Not sure if this is best in mgs or healeys so I am cross posting.
Can someone tell me what is involved in swapping from quarter elliptic to semi elliptic springs? I am going to a narrowed rx7 axle so while I am at it I am wondering about trying semi elliptical springs from a donor midget I have to try to get a better ride and maybe be easier to set up.

patrick
4age bugeye swap in progress


Bill Young
Bill Young
Kansas City, MO
(1337 posts)

Registered:
10/23/2007 09:23AM

Main British Car:
'73 MG Midget V6 , '59 MGA I6 2.8 GM, 4.0 Jeep

authors avatar
Re: switching from 1/4 to 1/2 elliptics
Posted by: Bill Young
Date: June 09, 2011 08:37AM

Patrick, the floor pan on the Bugeye doesn't have the spring mounts for the front of the springs so you'd have to fabricate those or get replacement panels from Moss or such. In the rear the floor pan of the trunk area isn't formed for the bolts and those would be difficult to access from inside the rear of the Bugeye anyway. Personally I think that your best option would be to work with the existing spring mounts if they are in good condition and not rusted and go with some type of coil over shock arrangement and a three or four link. I think you'll be much happier in the end as well. Check out Brian Kraus' conversion for his rear end treatment. Very similar to what I'd think would work well in your chassis. [www.britishv8.org]
Jim Begor also did a 4 link with coil overs in his Bugeye and it's well done and works great.
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Moderator
Curtis Jacobson
Portland Oregon
(4411 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: switching from 1/4 to 1/2 elliptics
Posted by: Moderator
Date: June 09, 2011 12:43PM

Bill's advice sounds good to me.

Personally, I know next to nothing about the quarter elliptic design or about how one would convert... but the topic also came up briefly a couple weeks ago when I was talking to Craig Chima about racing Spridgets for this article and for another that's coming up about Harry Gentry's Sprite. Harry is lightning quick on quarter elliptics. I asked Craig if he figured Harry was giving up any performance by using the earlier suspension, and his answer was to the point: "Not at all." Now I need to get with Harry and find out if he has any set-up tips he's willing to share. Of course that's all within the context of vintage racing, where modifications have to fall within specific rules and where ride comfort doesn't matter.


roverman
Art Gertz
Winchester, CA.
(2992 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: switching from 1/4 to 1/2 elliptics
Posted by: roverman
Date: June 10, 2011 01:44PM

Patrick,RX 7 rear, as in IRS ? Throw away SLA's and use semi eliptics ? When did RX 7's use non IRS ? Good Luck, roverman.


Bill Young
Bill Young
Kansas City, MO
(1337 posts)

Registered:
10/23/2007 09:23AM

Main British Car:
'73 MG Midget V6 , '59 MGA I6 2.8 GM, 4.0 Jeep

authors avatar
Re: switching from 1/4 to 1/2 elliptics
Posted by: Bill Young
Date: June 10, 2011 01:50PM

Art, the first and second generation RX7s used a live rear axle, then went to an IRS later on. It's a pretty neat swap into a Midget as they used 13" wheels and disc brakes so it will clear the original size Midget wheels as well. Jim's car pictured above uses an S10 rear but Brian's car uses a first generation RX7 rear.


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