Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Difference between Suplex and Mulfab front mod?

What is the difference between the Suplex and Mulfab front mod?

Hard Chrome Kingpins, over-size Phosphor Bronze kingpin bushes, Steering Bearing kit, Steering Damper, Adjustable Dampers and Brake Reaction Stays

As Your question has not been answered I will attempt to do so.

Basicly the Mulfab unit is a 140in/lb spring with a thrust bearing. The spring has been shortened the same thickness as the thrust bearing to keep the "ride height" as designed.

The Suplex Kit is an engineered suspension system designed for a more compliant ride, on rough roads. It utilizes a 100in/lb spring, as well as a progressive spring installed above the stub axle which comes into play on large bumps. It also has a threaded upper spring mount that is adjustable (for ride height) according to weight.

The two are "apples & Oranges". They do different jobs for different conditions, and different driving styles.

Mulfab had a wishbone conversion I thought?

Yes they also have a wishbone conversion which is very interesting.

Thank you!
I think it is part of this Suplex kit http://www.librands.co.uk/products-view-156.html?
and this Mulfab kit http://www.mulfab.co.uk/our-products/9/steering-suspension/steering-bearing-kit I´m thinking on.
Do you have have an experience with both? (Particularly on narrow, winding country roads!)

I have the Mulfab and it has made a lot of difference to my 4/4 sport which had soft main springs. It does not now hit the bump stop as it did regularly before and the ride height has been raised by half an inch which is great on my drive and speed bumps. Also it is a lot cheaper than the Supplex.It has also stopped the front end "nodding" on undulating roads thus giving a smoother ride. I think it would be OK on Norwegian roads which from memories of driving around Bergen can be quite challenging.

You have speed bumps on your drive..? Nice pad, Phil..!!

The most important factor in stopping the "nodding dog" syndrome is, as PJB has proved, to have the lower rebound spring unloaded at static (road ready load) ride height. The adjuster is to insure that this condition may be acheived regardless of the differing weight of the various engine configurations.

The Suplex kit is supplied with a 20mm spacer to set the ride height in one of two positions but my car now uses a series of shims to set the height and now has 10mm above and 10mm below the axle. Any spacers could be used to set the ride height as long as the total is the designed 20mm.

If someone wants a firmer front end the lowest rate spring from the Suplex race kit can be fitted. Contact Suplex for details.

I should also add that the Suplex/Peter Ballard design is oriented towards a comfortable ride whilst maintaining good handling. This is why the initial spring rate is lower than that of the Mulfab springs and it is also why there is a second "rising rate" spring to stiffen up the suspension in extreme bump situations. Roll control is assisted by the lower rebound springs which a very stiff and help to minimise the lift in the suspension of the car on the inside whilst cornering.

The Suplex race kit is obviously oriented more towards sharp handling on a race track and comes with a set of higher rate springs that allows the car to be set up to the requirements of the driver.

I can't comment on the Mulfab kit as I have never used it but I can see that any correctly set up front spring would be better than that fitted to some of the older Morgans. There are many owners on this forum that are very happy with the Mulfab setup.

It must be said that the new Morgans are much improved in this respect by comparison to the setup they supplied with my car only 4 years ago.

During my thorough post Cornwall cleaning session today, I discovered some writing on the front springs.
"Suplex Morgan MFS0755".

I am using the lower ride height position on My +8 Bitsa. The problem I am having (and why I have not used them) is the shocks are too long and become "too blocked" (fully compressed). I had special upper shock mounts made that are 1" higher. But still a problem. Is anybody besides Me using the lower ride height setting?

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