66 replies to this topic

[cooper997]

A defining moment in the challenges Owen Racing Organisation had gone through developing the Type 25.

 

BRM drivers profile from the 1959 Dutch GP programme.

 

 

31/5/59 (P) Dutch GP Zandvoort.

6 BRM Harry Schell Amerikaans 1-37.3

7 BRM Joakim Bonnier Zweeds 1-36.0

 

 

The winning Bonnier BRM featured on the cover of both the weekly Autosport and monthly Motor Racing - here's the later .

 

 

Stephen

[cooper997]

Michael Bowler had a play in the re-constructed Stow/ Lamplough Type 25 for T&CC. Michael able to mix editor's priviledge for a then very keen historic racer.

 

 

 

 

This issue also has a double page colour poster of the car, alas there's also a supplement inserted to complicate photographing for here.

 

Also the reference to Arnold Glass' P48 is the wrong chassis number if I'm on the right tangent

 

 

Stephen

[cooper997]

I've just reminded myself that the wonderful, late John Ross (AutoCourse) archive spoils us with numerous Type 25 photos.

 

https://www.johnross...co.uk/index.php

 

page 1 should show 1959 Aintree BGP colour photos of the 3 cars run there and page 2 will take you to the 14 BRM photos of build and Folkingham test related B&W gems.

 

Possibly more if you keep looking.

 

 

Stephen

[Lee Nicolle]

The 'new' BRM managed to make the FOS hill running fine. At the road race track I feel it did about 3 laps then went into limp mode

[Doug Nye]

Just as an aside on Type 25s in general - I have just happened across an old note from Tony Rudd about the account of his brother-in-law (and team mechanic) Pat Carvath which reads as follows:  Pat looked after 258 when Jo Bonnier drove it.  Apparently there was an administrative cock-up getting ready for the French GP at Reims in 1958. Sandy..." (Sandercombe, company secretary) "...who organised the carnets was not told 258 was going abroad (for Trintignant) until too late to get it a carnet so 258 was visibly marked 27/3 as 27/3 had been written-off earlier in the year when Behra crashed at Easter Goodwood, and thus had a redundant carnet.  We had expected to use it as a spare, when making the pre-season plans, and had not expected to use 258 until the German GP.  Penny wise and pound foolish, again.  Does not make much difference...".

 

DCN

[Roger Clark]

My understanding (probably based on DCN’s books) is that the single rear brake concept worked fine on the front-engined Type 25. As has been said earlier, most of the problems with this layout didn’t stem from the single-disc concept itself.

The rear-engined P48 had more weight on the rear wheels and thus more braking capacity at the rear wheels was needed. The single-disc concept could no longer cope and was replaced during 1960 by the more conventional twin-brake setup.

I thought there was also a problem with the early cars that the disk rotated at engine speed and the rubbing speed was far too high for the pads of the time. This was cured by the inclusion of a reduction gear which worked well on the front engined cars. With the P48 Mk 1 it meant that the engine had to be mounted higher than was desirable. 

[cooper997]

The Type 25 was keen for modelling purposes in period. Here's 9/59 Model Maker magazine's second feature of the 4 cylinder car ( with reference to the original in 12/56 issue - I don't have)

 

 

Under the caption for the photo of the 2 mechanics with RF, Easter Silverstone is referenced. Likely the photo is from 5/59 Silverstone International.

 

 

 

Stephen

[RobertE]

I have it in my mind that when Stewart Tresilian did the original engine design, he had as a four-valve layout, which was modified by Peter Berthon into a two valve, which created vibrations not originally envisaged. 

 

Is this so? Someone on here will know...

[Roger Clark]

It’s true, though Tresilian left in February 1953 so there was a long way to go before P25 appeared in public. It is, perhaps, ironic that a decade later Peter Berthon spent a lot of time and money trying to make 4-valve heads work on the V8 after he had been shipped out to Weslake. 

[Sterzo]

The Type 25 was keen for modelling purposes in period. Here's 9/59 Model Maker magazine's second feature of the 4 cylinder car ( with reference to the original in 12/56 issue - I don't have)

 

Not too bad a plan, if slighly wrong (to my eyes) at nose and tail. And - very Model Maker of the day - the artist has been fooled by the near-obscurity of the number one exhaust into omitting it entirely, rendering the car as a three cylinder. Might want my 2/6d back.

[68targa]

They had another go at it 11 years later.

 

[Sterzo]

Oh dear...

[Ray Bell]

They just wanted to show that they weren't exhausted...

[rl1856]

A link to the February 1960 issue of Sports Cars Illustrated, the precursor  to the US magazine Car and Driver:

 

   https://archive.org/...river_1961-02_6

 

The issue contains an in depth article regarding the P25 engine, including cutaway and discussion of the valves and valve train design.

 

I have it in my mind that when Stewart Tresilian did the original engine design, he had as a four-valve layout, which was modified by Peter Berthon into a two valve, which created vibrations not originally envisaged. 

 

Is this so? Someone on here will know...

[cooper997]

Minor correction on the SCI BRM related,piece, that's Feb 61 issue.

 

 

Stephen

[cooper997]

A couple of late 1950s Merit kits

 

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Stephen

 

 

[cooper997]

Last week I picked up a brand new, 21yo copy of 'Peter Coltrin - racing in color 1954 - 1959' from the local motoring bookshop. Given it was still sealed I didn't know what I would discover and last night I finally removed the wrapping to reveal some wonderful all color photos.

 

Amongst the vast array selected for the book are lots of red cars, but some wonderful shades of green too. One of several BRM related is this one from 1959 Monaco. Quite possibly available to be purchased from the Klemantaski collection, who supplied their Coltrin collection to the Italian publisher of the book.

 

 

 

Stephen

Edited by cooper997, 24 August 2024 - 10:47.