Speed 25 air filter conversion

For Speed 20, Speed 25, 3.5 Litre and Crested Eagle cars
simhin
Posts: 8
Joined: Mon Aug 08, 2016 12:05 pm
Name: Simon Hinson

Speed 25 air filter conversion

Postby simhin » Tue May 09, 2017 11:48 am

Hello,

Does anyone have experience of replacing the air filter?
I was trying to fit some ram stacks with 'sock' type filters, to make some spave and to remove the big filter box, and also to improve breathing, however the hole centres on the carb flange are 2 1/4 inch (58mm) and no -one seems to have any that fit....lots of 2 inch flanges..

I have seen several cars with this mod, but dont know what they've used.

any advice gratefully received

Angus D'Arcy-Drake
Posts: 76
Joined: Mon May 21, 2012 9:05 am
Name: Angus D'Arcy-Drake

Re: Speed 25 air filter conversion

Postby Angus D'Arcy-Drake » Fri May 12, 2017 10:34 am

Years ago my father experimented with his Speed 25 and in the end concluded that the best solution was to do away with the ugly old air box but keen the aluminium casting (which will polish beautifully). He had a tube fabricated that attached to the two intakes on the aluminium casting, but faced forward with a gauze across the front to trap the flies. He had to slow the tick-over down after doing this such was the improvement in how the car breathed.

johnlayzell
Posts: 147
Joined: Mon May 21, 2012 2:44 pm
Name: John Layzell

Re: Speed 25 air filter conversion

Postby johnlayzell » Fri May 12, 2017 11:06 pm

Are you interested in modifying the original Blundell Silencer to be an effective filter, or replacing it with a modern two filters system? I've done both and will be happy to post pictures of both if I can remember how!
1925 SC12/50
1937 SP25 VDP Saloon
1970 Peking to Paris Rally VW Beetle

simhin
Posts: 8
Joined: Mon Aug 08, 2016 12:05 pm
Name: Simon Hinson

Re: Speed 25 air filter conversion

Postby simhin » Mon May 15, 2017 8:37 am

Thanks for the advice,

I was hoping to ditch the old unit completely and replace with something else..its just that I cant find anything that fits the 'centres' of the bolt holes on the carb.
Photos appreciated

Regards

Simon

johnlayzell
Posts: 147
Joined: Mon May 21, 2012 2:44 pm
Name: John Layzell

Re: Speed 25 air filter conversion

Postby johnlayzell » Mon May 22, 2017 12:16 am

OK, I have a total of 8 photos to post to show the two different alternatives I have tried. To begin I'm posting just one photo as it seems to be very large. Can a reader advise how to reduce in size so I can post all 8?

Image
1925 SC12/50
1937 SP25 VDP Saloon
1970 Peking to Paris Rally VW Beetle

johnlayzell
Posts: 147
Joined: Mon May 21, 2012 2:44 pm
Name: John Layzell

Re: Speed 25 air filter conversion

Postby johnlayzell » Mon May 22, 2017 5:14 pm

More photos of the the two modern filter, and modified Blundell Silencer alternatives. I now run the modified Blundell Silencer which obviously looks more period correct.

Image

Image

Image

Image

Image

Image
1925 SC12/50
1937 SP25 VDP Saloon
1970 Peking to Paris Rally VW Beetle

johnlayzell
Posts: 147
Joined: Mon May 21, 2012 2:44 pm
Name: John Layzell

Re: Speed 25 air filter conversion

Postby johnlayzell » Tue May 23, 2017 4:08 pm

Another alternative for consideration. Not my SP25!

Image


Image
1925 SC12/50
1937 SP25 VDP Saloon
1970 Peking to Paris Rally VW Beetle

simhin
Posts: 8
Joined: Mon Aug 08, 2016 12:05 pm
Name: Simon Hinson

Re: Speed 25 air filter conversion

Postby simhin » Wed May 24, 2017 12:53 pm

Thanks very much for the photos....did either mod make any diference to the running of the car?

REgards

Simon

johnlayzell
Posts: 147
Joined: Mon May 21, 2012 2:44 pm
Name: John Layzell

Re: Speed 25 air filter conversion

Postby johnlayzell » Wed May 24, 2017 1:42 pm

Nothing perceptible that this driver can determine!
1925 SC12/50
1937 SP25 VDP Saloon
1970 Peking to Paris Rally VW Beetle


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