Honda Rack and Pinion

Discussion in 'Technical' started by ryanonthevedder, Jun 28, 2025 at 10:55 PM.

  1. ryanonthevedder

    ryanonthevedder Member

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    Seeing as it doesn't have it's own thread I'll get one started.

    After plenty of research the early Cavalier R&P won as the most straight forward and developed steering mod, but good luck finding one. 1986 is the *newest* car they come in which is pretty slim pickings in 2025's wrecking yards. However the concept of a center takeoff R&P stuck with me and I found other's research listing a few later model cars that utilized that style.

    The 2001-2005 Honda Civics and Acura ELs utilize a center takeoff R&P and because I like Honda I went with them. The steering sweep from a 1970 Maverick is 5.25" (I measured mine) and the steering sweep from a 2003-2005 Honda Civic R&P is also 5.25". They are functionally the same. The Honda Element also uses a center takeoff but it is a few inches wider than the Civic's so I stuck with the smaller of the two.

    So in a quest to modernize the Cavalier R&P upgrade I am going to detail the job here as completely as I can for future generations. Speaking of future generations here is my son's first trip to the pick to pull to help me out.
     

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  2. TeeEl

    TeeEl Senior Member

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    Very interesting...
     
  3. ryanonthevedder

    ryanonthevedder Member

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    I can't claim to be the first one to do it but the info for a mav is sparse and other intel is scattered around. I found this little tidbit to be quite important to me as my car already has the Granada fronts installed...

    civic rack stang tierod.jpg
     
  4. TeeEl

    TeeEl Senior Member

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    What I want to know is:
    1. How does the rack mount to the car?
    2. How does the steering shaft attach to the steering column?
     
  5. ryanonthevedder

    ryanonthevedder Member

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    In the Honda the rack mounts up close to the firewall via 3 bolts and those holes are 25 3/4" center to center. The pinion side is 1.5" longer 'off center' but it looks like the pinion and spool valve should clear the frame rail while keeping the steering sweep centered. Also on close inspection it looks like a couple of brackets hanging vertically off the frame should suffice nicely. Similar to the cavalier r&p in spirit anyway.

    As for the steering column thats tbd, but there is a u joint at the top of Honda's pinion shaft to steering column which I retained.
     
  6. ryanonthevedder

    ryanonthevedder Member

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    Well it seems like it's gonna work. There is clearance everywhere I'm going to need it... The only thing I can see at the moment is that the width of the stock Honda steering is awful close to the stock Maverick steering width. Those longer Mustang tie rods are going to make it too wide unmodified. I'm thinking I'll cut the threaded section back some and run a tap down whats left to extend the threads further up. Conversely a guy could cut the required amount out of the hollow inner tie rods and weld em back together. TBD for me for now.

    Otherwise it all looks reasonable AND I'll be able to use the factory holes for the brackets.
     

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    canuck222 likes this.
  7. Jaybee

    Jaybee Member

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    Wow, that really looks like it could work! A lot of R&P conversions don't have favorable geometry. Thanks for sharing.
     
  8. ryanonthevedder

    ryanonthevedder Member

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    A little more progress today though for me its going to be a tight squeeze. On the Merc 3.7 I have to fit the steering, exhaust, and clutch slave though the same space but I think I can force it. None the less the Honda rack continues to show promise though its not going down without a fight.

    Over the last couple of days I had to convert my marine oil pan to a front sump system to make room for the steering though it would have been required rack or not.

    PXL_20250703_013119777.jpg PXL_20250703_155654301.jpg

    The wins today were in the mounting. I got the driver's side mounted up with a plate that took a couple hours from start to finish. I started with some heavy paper and came up with a template, transferred it to some plate, and cut it out with a zip disc. Once I was happy with the bend and how it was oriented I laid out some holes and presto.

    PXL_20250703_204743934.jpg PXL_20250703_203144057.jpg PXL_20250703_203122201.MP.jpg

    Where the problem lies going forward are the hard lines going into the ram end of the rack. Its a pretty narrow window for the pinion to approach the steering column and to make it work the rack has to be rotated in a way that will cause the tie rods to interfere with the steel fluid lines. The solution I am pursuing are some 90 degree elbows the will lower the profile at the front of the rack. The fittings going into the rack are a metric bubble flare (10mm I think) and the adaptors are rare and priced accordingly. I should just be able to re-flare the tubing with a new flare nut but moving an AN fitting in the process.

    PXL_20250630_170813959.MP.jpg

    Otherwise the project continues to show promise.
     

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