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Re: DCNF Webers [Re: NJR] #42156
26/03/10 02:59 PM
26/03/10 02:59 PM
Joined: May 2009
Posts: 2,190
South Wales UK
GLLHG Offline
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GLLHG  Offline
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Joined: May 2009
Posts: 2,190
South Wales UK
Originally Posted By NJR
I have replaced the stock filter on my '83 CVH (XR3 n/a) with a nice Pipercross. Sounds good and much improved throttle response, but the car runs out of breath past 80 in top, and struggles to gain further speed. Can I cure this with adjustment or is it a gearing problem?

Many thanks.

I notice that you have taken steps to free up the inlet side ( ie the Pipercross) but what about getting the used stuff out ie the exhaust side

I'm not suggesting that this is a complete fix because the issue is wider and really involves how wide the effective power band is and where it is deliverd, but if you are still on OEM stuff, then a better quality exhaust manifold and a system with a smaller silencer would be worth considering

A s a final point ( and apologies becuase this is a real hobby horse of mine) is the Pipercross situated so that it is giving you a good supply of dense, cool air?

regards,
GLLHG


GLLHG
Re: DCNF Webers [Re: cerealsurfer] #42164
26/03/10 04:42 PM
26/03/10 04:42 PM
Joined: Feb 2007
Posts: 397
Lincolnshire
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Originally Posted By cerealsurfer
Originally Posted By NJR
You guys sound like you know your stuff re carbs etc, looking for advice.
I have replaced the stock filter on my '83 CVH (XR3 n/a) with a nice Pipercross. Sounds good and much improved throttle response, but the car runs out of breath past 80 in top, and struggles to gain further speed. Can I cure this with adjustment or is it a gearing problem?


Moving to 185/55/15 tyres gives more pull with the power you have, esentially getting more effective Torque to the road. Alternatively you need more power to increase top speed.


You got 4 or 5 speed box? Mines a five and the engine seems to give more torque than out and out power so responds better in higher gears. That said it would get past that easily - if on a private road or in Germany officer. In fact it cruises quite hapily at 80, if on a private etc etc!! innocent


Simon
2002 4/4
1936 Austin 12 light 4 Ascot saloon
Mercedes C Class estate
Honda Jazz
Re: DCNF Webers [Re: NJR] #42167
26/03/10 04:53 PM
26/03/10 04:53 PM
Joined: Feb 2007
Posts: 397
Lincolnshire
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Lincolnshire
Originally Posted By NJR
Hi Guten,

I've just seen your pics...really interested in this set up for my car (after my daughters wedding!! spend)did you get the carbs, manifold, linkages etc as a kit if so, where from?

Did you do the installation yourself?



I bought them on ebay and they came with manifold and facet pump and pressure regulator. They were less than perfect it has to be said but that's the chance you take. I got overhaul kits and overhauled them, two mixture screws were broken and I got a slack handful of those (made some too when I couldn't initially source them but the threads were a little loose). On the up side they were jetted for a 1.6 cvh so I haven't made any changes to them, a rolling road may show changes required, especially in terms of MOT emissions. The attached pump can not be used because there's no space for it so it has to come off and fit a blank. As I've said elsewhere the exhaust manifold came from Melvyn Rutter and I already had the sports exhaust.
One of the things that threw me for a while (I've had these for nearly 2 years before final fitting) was that each choke has two adjusting screws, I finally found out one of these is for air balance (normally closed) and the other is mixture.
I hope this helps. thinking
Regards
Simon


Simon
2002 4/4
1936 Austin 12 light 4 Ascot saloon
Mercedes C Class estate
Honda Jazz
Re: DCNF Webers [Re: GLLHG] #42183
26/03/10 07:18 PM
26/03/10 07:18 PM
Joined: Feb 2008
Posts: 141
Southport
NJR Offline
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Originally Posted By GLLHG
Originally Posted By NJR
I have replaced the stock filter on my '83 CVH (XR3 n/a) with a nice Pipercross. Sounds good and much improved throttle response, but the car runs out of breath past 80 in top, and struggles to gain further speed. Can I cure this with adjustment or is it a gearing problem?

Many thanks.

I notice that you have taken steps to free up the inlet side ( ie the Pipercross) but what about getting the used stuff out ie the exhaust side

I'm not suggesting that this is a complete fix because the issue is wider and really involves how wide the effective power band is and where it is deliverd, but if you are still on OEM stuff, then a better quality exhaust manifold and a system with a smaller silencer would be worth considering

A s a final point ( and apologies becuase this is a real hobby horse of mine) is the Pipercross situated so that it is giving you a good supply of dense, cool air?

regards,
GLLHG


Breathing is improved at both ends, I have removed the tail silencer and put a straight through pipe ( single silencer box under n/s wing) but using stock exhaust manifold, which apparently is quite efficient. It has a 5 speed box but I get the feeling that top is quite 'long legged'. She pulls very well up to around 80 in top, then runs out of legs, but will cruise happily at that speed.

One thing, there's a small air pipe that that ran from the original air filter box to the base of the carb...should this be closed off, left fully open or remain attached to the small original valve, for best performance.

thanks for your help


rgds
Nick....just waiting for the sunshine...
Re: DCNF Webers [Re: Guten] #42184
26/03/10 07:55 PM
26/03/10 07:55 PM
Joined: Oct 2006
Posts: 2,374
C
cerealsurfer Offline
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C

Joined: Oct 2006
Posts: 2,374
Originally Posted By Guten
Originally Posted By cerealsurfer
Originally Posted By NJR
You guys sound like you know your stuff re carbs etc, looking for advice.
I have replaced the stock filter on my '83 CVH (XR3 n/a) with a nice Pipercross. Sounds good and much improved throttle response, but the car runs out of breath past 80 in top, and struggles to gain further speed. Can I cure this with adjustment or is it a gearing problem?


Moving to 185/55/15 tyres gives more pull with the power you have, esentially getting more effective Torque to the road. Alternatively you need more power to increase top speed.


You got 4 or 5 speed box? Mines a five and the engine seems to give more torque than out and out power so responds better in higher gears. That said it would get past that easily - if on a private road or in Germany officer. In fact it cruises quite hapily at 80, if on a private etc etc!! innocent

5 Speed and also have more Torque at the bottom end and with smaller tyres would roughly 1/2 the stock 0-60 time to approx ~7seconds and max out at about 97mph on the track.... that said looking to get ideally over 150bhp out of the engine this season and have just installed a close ratio straight cut competition gear set...





Re: DCNF Webers [Re: Guten] #42186
26/03/10 07:57 PM
26/03/10 07:57 PM
Joined: Feb 2007
Posts: 397
Lincolnshire
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Lincolnshire
I should also say that if I was doing this again I would go for IDF type weber carbs (also to be found on ebay but not with cvh manifold, this is available from Burton Power I think. The reason for this is that these have a different float bowl arrangement which is designed to be unaffected by for and aft or side to side forces. Although mine is running OK I have heard the comment that dcnf's are not suited to in line engines from several sources so I'm not convinced yet that they will be trouble free.
Regards
Simon


Simon
2002 4/4
1936 Austin 12 light 4 Ascot saloon
Mercedes C Class estate
Honda Jazz
Re: DCNF Webers [Re: NJR] #42188
26/03/10 08:03 PM
26/03/10 08:03 PM
Joined: Feb 2007
Posts: 397
Lincolnshire
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Lincolnshire
Originally Posted By NJR
Originally Posted By GLLHG
Originally Posted By NJR
I have replaced the stock filter on my '83 CVH (XR3 n/a) with a nice Pipercross. Sounds good and much improved throttle response, but the car runs out of breath past 80 in top, and struggles to gain further speed. Can I cure this with adjustment or is it a gearing problem?

Many thanks.

I notice that you have taken steps to free up the inlet side ( ie the Pipercross) but what about getting the used stuff out ie the exhaust side

I'm not suggesting that this is a complete fix because the issue is wider and really involves how wide the effective power band is and where it is deliverd, but if you are still on OEM stuff, then a better quality exhaust manifold and a system with a smaller silencer would be worth considering

A s a final point ( and apologies becuase this is a real hobby horse of mine) is the Pipercross situated so that it is giving you a good supply of dense, cool air?

regards,
GLLHG


Breathing is improved at both ends, I have removed the tail silencer and put a straight through pipe ( single silencer box under n/s wing) but using stock exhaust manifold, which apparently is quite efficient. It has a 5 speed box but I get the feeling that top is quite 'long legged'. She pulls very well up to around 80 in top, then runs out of legs, but will cruise happily at that speed.

One thing, there's a small air pipe that that ran from the original air filter box to the base of the carb...should this be closed off, left fully open or remain attached to the small original valve, for best performance.

thanks for your help


I'm not clear what you mean here. The original set up has an emissions valve with the top connected to the rocker cover, the side to the filter and the small pipe on the bottom to the carb. As I understand it this uses the vacuum caused in the choke above the butterfly to open the valve and so draw the fumes when working hard out of the rocker box and in to the air intake, that's how I have connected mine. You often see photos of CVH engines with a filter connected to this rocker outlet. I tried this and got smelly fumes in the cockpit when accelerating so reverted to the original set up.
Regards
Simon


Simon
2002 4/4
1936 Austin 12 light 4 Ascot saloon
Mercedes C Class estate
Honda Jazz
Re: DCNF Webers [Re: cerealsurfer] #42260
27/03/10 07:21 PM
27/03/10 07:21 PM
Joined: Oct 2006
Posts: 2,374
C
cerealsurfer Offline
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C

Joined: Oct 2006
Posts: 2,374
I've been playing all day and have installed the Ram air system into the Morgan... it also just about fits under the bonnet so no holes.. smile smile

I'll put some pictures up when I get a chance.





Re: DCNF Webers [Re: cerealsurfer] #42265
27/03/10 10:09 PM
27/03/10 10:09 PM
Joined: Feb 2007
Posts: 397
Lincolnshire
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Sounds interesting


Simon
2002 4/4
1936 Austin 12 light 4 Ascot saloon
Mercedes C Class estate
Honda Jazz
Re: DCNF Webers [Re: Guten] #42266
27/03/10 10:17 PM
27/03/10 10:17 PM
Joined: Oct 2006
Posts: 2,374
C
cerealsurfer Offline
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Joined: Oct 2006
Posts: 2,374
Indeed... should be first of type based on what i've come accross.





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