Weber 38 dgas modified to 40mm (?) and kent V63K fast road

[flyingdutchie]

I have my eyes on a fast road camshaft and i think I once saw a post of modifying the carb to 40mm. Is this possible with the 38 dgas and a sensible thing to do? I know it would further benefit from fast road heads with larger valves…..

[plasticpig72]

I suggest when you look for a Sports cam and have decided on one buy a milder one.
I know a few people who have fitted for example a Piper 285 or something like that and after have regretted it. Unless you will only use your Car on the Circuit.
Alan

[flyingdutchie]

/If I compare the specs the piper has a much higher lift 11.61mm inlet and 11.56 exhaust and a duration of 288 for both. The Kent cam has 7.99mm inlet and exhaust and a 276 inlet/exhaust duration. The Kent can be fitted with no modifications. The Piper begins at 2000rpm's and the Kent already at 1500rpm's. Kent also has a mild road camshaft, but these 2 cannot be compared, I think…….

[plasticpig72]

Sorry i explained what i wanted to say badly.
I am not comparing Cams.
For me once you have decided on a Cam before you buy consider a milder Cam.
Things can look good on paper but in reality they can be not what you want.
I know a few people who have fitted sports Cams and after said it would have been better a milder Cam.
Even a Cam that on paper works from 1500 rpm can be very tiring.
Of course it depends what you want to do with your Car.
Alan

[anonymous-user]

flyingdutchie said:

I have my eyes on a fast road camshaft and i think I once saw a post of modifying the carb to 40mm. Is this possible with the 38 dgas and a sensible thing to do? I know it would further benefit from fast road heads with larger valves…..

Just fit a 40DFAV they’re great carbs.

[neutral 3]

We took this 3 Litre V-6 out of a MK1 3 Litre Capri 10 years ago, for another MK1 3 Litre Capri resto project we have. It was fully rebuilt, inc a Kent cam ( a V-62 from memory ) and it has the very early 3 Litre Capri 40mm carb on it.
We have another 3 Litre Capri engine, with a 38 carb on it, which we will be fitting to this engine.

[neutral 3]

38 carb.

[anonymous-user]

The early Capri 40mm is a great carb and quite sought after. Theres old fake news about bore washing but I know of three cars with them on that have never had such issues in a total of 110,000 miles driving and I certainly haven’t had any problems in 10 years.

I have a very nice adapted 38DGAS plenum to fit either the 38 or 40 with an air duct with remote filter all unused which I keep forgetting to put on eBay!

[neutral 3]

I’m sure though, that the 69- Sept 71 3 litre Capri, with the 40 carb, had a water heated inlet manifold ?
The one we have has no water heated manifold, so must have had a manual choke ?
We took this engine out of a Capri 10 years ago, so can’t recall if it had a manual choke !

[anonymous-user]

neutral 3 said:

I’m sure though, that the 69- Sept 71 3 litre Capri, with the 40 carb, had a water heated inlet manifold ?
The one we have has no water heated manifold, so must have had a manual choke ?
We took this engine out of a Capri 10 years ago, so can’t recall if it had a manual choke !

You mean auto choke - yes some were manual and there’s a conversion kit to manual but it’s a half hour job to swap one to the other as the fixings are the same. The auto choke works well though when it’s set right.

[rev-erend]

Many years ago, my second car after I passed my driving test was a Swaymar tuned mkII Cortina.

I remember it had a weber 40 DF15 carb.

Looking for it on the new I stumbled across this site:

https://www.essexengines.com/tuning%20the%20essex%...

Looks like its a better race carb than a road one.

Another interesting site:
https://classiccarbs.co.uk/products/weber-carbs-pa...

https://www.burtonpower.com/parts-by-fitment-type/...

Edited by rev-erend on Friday 1st May 14:43

[Dollyman1850]

rev-erend said:

Many years ago, my second car after I passed my driving test was a Swaymar tuned mkII Cortina.

I remember it had a weber 40 DF15 carb.

Looking for it on the new I stumbled across this site:

https://www.essexengines.com/tuning%20the%20essex%...

Looks like its a better race carb than a road one.

Another interesting site:
https://classiccarbs.co.uk/products/weber-carbs-pa...

https://www.burtonpower.com/parts-by-fitment-type/...

Edited by rev-erend on Friday 1st May 14:43

they are known for throwing gobfulls of petrol down the bores and running very rich... Hence better suited to flat out race applications than road cars. :-)

[SlimJim16v]

The DFI does run very rich, so rich it can work without using a choke. Not rich enough for bore wash though. I had a few on a rolling road and remember asking about it. It can be better jetted to reduce it too.

I ran cars with this carb for many miles without any problems, other than vapour lock on very hot days.

I'd probably use the early V6 40 carb if I had to do it again.

There is some simple flowing/porting you can do to help with the poor fuel distribution on the std manifold.