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Simon Johnston
United Kingdom
6145 Posts |
 Posted - 12/10/2018 : 17:34:02
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It may be well known, but in case not, a company called Brooklands Engine Craft ( www.brooklandsenginecraft.co.uk ) make new first and second gears for J2 and PB boxes. My questions is, can such gear sets be used in a PA box?
Simon J
J3437 |
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Rainier
Netherlands
160 Posts |
Posted - 12/10/2018 : 17:52:53
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Unfortunately, it’s the third and fourth that you need to convert to the more popular ratios.
Rainier |
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MaGic_GV
United Kingdom
868 Posts |
Posted - 12/10/2018 : 18:42:15
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Simon, The gears can be used if they are a set but you also need a different first motion shaft, does this company produce those too? I believe they are different for each model...
Regards,
Graham
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Simon Johnston
United Kingdom
6145 Posts |
Posted - 12/10/2018 : 19:22:27
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Graham, are you saying that the PB box, as well as having the different first and second gear ratios compared to the PA had a different first motion shaft? I know it's different to the J2 one, but different to the PA?
Ranier, are you sure?
Simon J
J3437 |
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kimber
United Kingdom
1529 Posts |
Posted - 12/10/2018 : 19:42:57
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He's right.
Very few parts from a PA box are interchangeable with J2/PB/NB etc.
First motion shafts are definitely different.
J2 and PB 1st motion shafts are the same except PB spline is longer (can be shortened to fit a J2 box, should you feel so inclined) |
Edited by - kimber on 12/10/2018 19:47:38 |
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Simon Johnston
United Kingdom
6145 Posts |
Posted - 12/10/2018 : 19:46:57
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I didn't think that it was possible or otherwise everyone with a PA would do it but having the much superior J2 box ( ) I don't know much about the PA one, other than that it's not ideal.
Simon J
J3437 |
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kimber
United Kingdom
1529 Posts |
Posted - 12/10/2018 : 19:52:36
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| In my experience with the new camshaft profiles now available which give more low down torque, the gap between 2nd and 3rd on a PA is less of an issue. |
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Simon Johnston
United Kingdom
6145 Posts |
Posted - 12/10/2018 : 20:07:48
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Changing the camshaft sounds like a much less expensive way of addressing the problem. I'll pass that on to my friend who first drew my attention to Brooklands Engine Craft in the hope that they could work miracles with his gearbox. Having said that, whose camshaft offers this improved torque?
Simon J
J3437 |
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sam christie
United Kingdom
3108 Posts |
Posted - 12/10/2018 : 20:24:00
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These are relevant pictures from Brooklands Engine Craft.
They say -
The gears are for the Wolseley 1933 box and MG J2 and we are told PB. A picture is shown here. http://brooklandsenginecraft.co.uk/wolseley%20spares.html
They cost £1,000 total the set plus postage. Included in the cost is a fitting service, you send us your output shaft and layshaft. We have made our new parts to need finish grinding to match the parts they are to work with exactly.
If you need more info, please ring me on 01380 850779.
Sam |
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kimber
United Kingdom
1529 Posts |
Posted - 12/10/2018 : 21:24:12
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quote:
Originally posted by Simon Johnston
. Having said that, whose camshaft offers this improved torque Simon J
J3437
Baynton Jones.
Possibly others too. |
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Simon Johnston
United Kingdom
6145 Posts |
Posted - 12/10/2018 : 21:44:16
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Thanks, Andrew, I'll pass that on to my pal.
Simon J
J3437 |
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Orstin
United Kingdom
637 Posts |
Posted - 13/10/2018 : 08:22:51
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Somewhat indirectly associated with this post, Steve Hughes of Brooklands Engine craft, is well known in the Riley world and I have used his gears in a Riley 9 gearbox to give higher ratio second gear which, franky, transformed the driveability of the car. So he does know what he is doing...
So many dynamos |
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Simon Johnston
United Kingdom
6145 Posts |
Posted - 13/10/2018 : 10:58:26
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It's not really of any concern to me me but might these folks make replacement gears for the PA box with the PB ratios?
Simon J
J3437 |
Edited by - Simon Johnston on 13/10/2018 10:59:15 |
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Rainier
Netherlands
160 Posts |
Posted - 13/10/2018 : 12:05:37
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It is quite complicated. As you need to make a new input shaft, 3rd gear, 4th gear and gear shifting forks. It has been done, as you will find in the archives of this forum, the question pops up now and then but recently no one has taken the effort of actually making them for whatever reason.
I suspect there are quite a few people who would be interested, I got some information as well on who is able to make the gears, but getting the right dimensions to make it an easy fit is a challenge!
Rainier |
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Oz34
United Kingdom
2543 Posts |
Posted - 13/10/2018 : 12:21:12
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I should have thought that, as long as the OP are not listening, if one were to go to the expense of producing new gear sets, entirely new ratios rather than "PB/J2 in a PA box" might be the way to go?
Dave |
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Rainier
Netherlands
160 Posts |
Posted - 13/10/2018 : 12:44:55
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New ratios sound quite attractive, any suggestions on what might be more desirable?
A reason to stick to J2 or PB is that you can copy those gears and input shafts without having any risk the gears won’t fit or work.
Rainier |
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