Twin 40 Conversion - 2Ltr Pinto

[Guest S7wreck]

Hi,

 

This is my first post on here so please forgive me if it's in the wrong place.

 

I have received a bit of a wreck of a S7 from a family member who had given up with his rebuild project. Apart from desperately needing a respray the carb that is on the car either needs rebuilding,binning or setting up (I believe it was sourced from a larger v6 engine) - the car mis-fires badly, runs hot and idles irratically, and the carb is too high to sit under the original bonnet once the air-filter is in place. I was therefore thinking of converting to twin 40's - I have seen a matching pair that are for sale, I know I would need a manifold to fit the pinto but what else would I need to source to make them work.

 

Sorry if it sounds like I'm a bit thick but this is all new to me so just trying to get my head around it so to speak.

 

Many thanks in advance.

[Guest S7wreck]

TBH now you've mentioned it I'm sure it was the 38DGAS that I was told had been fitted.

 

The car was originally my dads who had fabricated a fibreglass bonnet which has a hole cut out for the air filter, however apart from sorting the running problems I'd much rather re-fit the orignal bonnet which I also have. I see a lot of people on here are using twin carbs, would you not recommend them?

 

It will take me a while to sort the car out before I would class it as roadworthy as it also has overheating issues aswell as messy wiring to sort out.

 

PS.. I live about 10 mins drive from Durham.

[speedtripledan]

to get the the 38dgas to work on a pinto requires the main jets drilling to stupid big to compensate for a lack of air speed through the carb. once set up you will be getting less than 20mpg.. bike carbs are worth a look good performance good mpg and prob cheaper than 40's

[Snapperpaul]

DGAS can be made to work as all the jets and air corrector a can be changed

Twin 40's are only any good on a fairly standard 2.0L as 33mm chokes are the maximum size that will work properly

45's are better as they will take chokes upto 38mm

Bike carbs are a cheaper install and work better in my opinion

The other heat issues could be crud in the waterways and radiator, give it a good flush out

New thermostat

Check ignition timing

Check cam timing

[Guest mower man]

Drilling jets is bodgery on a Weber , jets are available widely and people will often swap ,I bought a ready jetted dgas but still had to change idle jets from 45 upto 50 to get a reasonable idle speed , performance is good and so is economy so long as you drive sensibly [ 6 galls 187 miles ] ,ok it is not earth shattering but keeps me entertained mowerman ps I have a jetting list somewhere I will dig it out

[Guest merc190provan]

If my memory serves me correctly both throttles open together on a DGAS and simultaneously on a DGAV, correct me if i am wrong. hope this helps correctly indentify your carb. As said before i would go with the bike carbs, available cheaply on an auction site and manifolds are plentiful.

[Big Jim]

The DGAS set up correctly will give you a better drive than twin 40's, it will also give you better fuel figures . Bike carbs look and sound good, and are much better than twin webbers but will cost you a bit for a manifold etc, and rolling road session to get them tuned.

 

I've had 40's on a Pinto, they lasted 1 month then I took them off and fitted a good DGAS.

[Guest mower man]

If my memory serves me correctly both throttles open together on a DGAS and simultaneously on a DGAV, correct me if i am wrong. hope this helps correctly indentify your carb. As said before i would go with the bike carbs, available cheaply on an auction site and manifolds are plentiful.

not wishing to be pedantic but isn't simulataneously and together the same I think you mean seqentialy , not jibe honest merry christmas mower man

[Snapperpaul]

40's are only good for a standard Pinto RS2000 spec, any more and 45's are needed

Rule of thumb

40's max Venturi 33mm

45's max Venturi 38mm

I know you can fit bigger but the Venturi effect is lessened making the carbs less than ideal

[richardm6994]

Also worth noting that 48's have a minimum Venturi of 38mm (or at least that's the smallest I could find). This is what I ran however I'd say 36mm is optimum size for a tuned pinto.