Marlins a la Frog!

[marlin munroe]

Re: Marlins a la Frog!

Did someone learn the hard way, not to inflate Roadster tyres to what you would recognise as standard car pressures.

Talking of which...did we ever reach consensus on the correct tyre pressure?

Does it depend on whether its a 10 ounce Triumph Herald engine , or a half ton Rover V8?

( mine is the BMW 2.5 M20 B25)

Or is it roughly standard across the various engines?

[copperleaves11]

Re: Marlins a la Frog!

With a BMW M20 I have mine at 16psi front and 18psi rear.

[dcunn]

Re: Marlins a la Frog!

Let's compare like with like...…………………….m munroe what variety of Marlin do you have ?

[marlin munroe]

Re: Marlins a la Frog!

Let's compare like with like...…………………….m munroe what variety of Marlin do you have ?

Its the one Simon Gregory built in 2008; with the 2.5 BMW 6 cylinder M20 B25 engine

[marlin munroe]

Re: Marlins a la Frog!

That pic was take back in July when I first went to look at it prior to buying

[Tony Stott]

Re: Marlins a la Frog!

Ok, the car is no longer listed, possibly sold I think!

[milliemarlin]

Re: Marlins a la Frog!

With a BMW M20 I have mine at 16psi front and 18psi rear.

I would be wary of running tyres with pressures much below 20psi. Although it improves the ride in a light car they are designed to work at a certain pressure. The best indicator of correct pressure is an even wear pattern.

There is a discussion here (admittedly for a roadster)

https://www.marlinownersclub.com/forum/showthread.php?6889-Tire-pressure

Paul

[greyV8pete]

Re: Marlins a la Frog!

For the Cabrio the late Mark at Marlin recommended 18psi. I run mine at 19psi all round and pump them up when they get down to 18psi. I have te Rover V8 3.9i engine and enough tools in the boot to do a full body off rebuild! Old classic car habits die hard! The wear patten is even, right across the tread pattern.

I think we should beware of referring to pressure recommendations which are based on production car weights. It is the weight per corner loading on the tyre that determines its loading and pressure requirement to support that load, whilst giving the manufacturers intended tread contact patch. Peter.

[stevejgreen]

Re: Marlins a la Frog!

I would be wary of running tyres with pressures much below 20psi. Although it improves the ride in a light car they are designed to work at a certain pressure. The best indicator of correct pressure is an even wear pattern.

There is a discussion here (admittedly for a roadster)

https://www.marlinownersclub.com/forum/showthread.php?6889-Tire-pressure

Paul

Its a compromise between handling and comfort, and the construction of the tyre!
Radials are far more forgiving than crossplys. There are probably zero roadster owners running with pressures higher than 20psi, unless they have a really exceptional specialised setup.
Due to the limited choice of Marlna based cars torsion bars, it’s suspension is highly dependant on the tyre wall deflection, rather like the current batch of F1 cars, but compounded by the fact that there are numerous tyre manufacturers with different sidewall resilience.
There are no hard and fast rules, it’s all personal handling preference, and very much a combination of multiple compromises, inevitably based on trial and error, some errors being catastrophic to the integrity of the chassis and the ultimate survival of driver and passenger.

[scott h]

Re: Marlins a la Frog!

As said above the best indicator of correct tyre pressure is even ware across the tread, however this can take several thousand miles to show. Another way is to check the temperature across the tread, aiming for as even as possible. Too high a pressure would show the middle to be hotter, and too low the middle would be cooler. Infra-red temperature probes are available for less than £20.

[Tony Stott]

Re: Marlins a la Frog!

and another appears

https://www.leboncoin.fr/voitures/1750911277.htm/

[wiggiesworld]

Re: Marlins a la Frog!

and another appears

https://www.leboncoin.fr/voitures/1750911277.htm/

Very nice example too......

[Tony Stott]

Re: Marlins a la Frog!

3 more although the last one has been up recently, I think the advert period had expired! The green roadster would appear to have been recently registered here in France!

https://www.leboncoin.fr/voitures/1754474869.htm/

https://www.leboncoin.fr/voitures/1753602328.htm/

https://www.leboncoin.fr/voitures/1639174781.htm/

[Tony Stott]

Re: Marlins a la Frog!

and another re emerges!

https://www.leboncoin.fr/voitures/1755136474.htm/

[dcunn]

Re: Marlins a la Frog!

Thanks Tony, keep 'em coming

All are now identified

Rgds DC