Pinto with twin DCOE Webers (poor running)

[MPETT]

I've got a 2l Pinto in my westfield and I'm trying to get it running properly for emissions purposes and the impending IVA test.

I went to Northampton Motorsport to get the correct jets for the twin 40 DCOE webers, have had the emissions checked/tweaked, and had a play with the distributor but am still getting occasional backfires through one of the carb barrels and the engine doesn't have that pull/punch I'm looking for. The emissions are now within tollerance.

Is there anyone out there that can confirm that I have the basics correct before I go and spend a small fortune on the rolling road.

Fully rebuilt engine to standard spec
Standard cam and camshaft pulley
Around 10-12degrees of advance (burton bosch electronic dizzy)
Chokes: 34mm (was 30mm supplied with new carbs)
mainjets: 135 (was 115 supplied with new carbs)
Air correctors: 160 (was 200 supplied new with carbs)
Idle jets: 50 F9 (were 45 F9s)

My only thought thus far is the air correctors seem to be smaller than the general thinking on the websites that reccomend 190s.

If someonehas any experience I'd appreciate your thoughts.
Cheers,
Martin

p.s. I've checked for air and exhaust leaks, but have found none to date.

[RLK500]

Can't help directly. However, have you tried posting the question up on "OldSkoolFord". There are loads of posters on there who would be able to provide a bit of guidance.

As someone who is in the process of resurrecting my RS2 Race Car, I feel your pain........

[Justin S]

Troy and the guys do know their stuff. The only issue you have is IVA. Best to get through that crap then get it onto their rollers for setting up. It will not pass IVA if tuned up correctly. Backfires are because it is lean.

[jagracer]

The air correctors wont come into play until top revs are reached, you need to be looking more at the idle jets for emissions plus you don't say what emulsion tubes you have, you also now have quite large chokes and don't say what auxiliaries you have. The back fire is more than likely a poor balance issue or an air leak somewhere, even a hole in the exhaust can cause it. Webers seem to be quite a black art and in the long run it can be cheaper and better to fit throttle bodies and an after market ecu.

Edited by jagracer on Thursday 24th February 19:00

[Rich's Granny]

I had very similar problems with a standard spec 2 litre pinto and twin 40's in a mates Robin Hood.

Eventually we decided it was 'over carbed' for a standard unmodified engine. We took the twin 40's off and fitted a correctly jetted 38 DGAS and manifold and the car was fine after that. The 40's looked the part but in practice didn't work.

[# Lord Lucan #]

twin 40's on a std Pinto there is your problem to start with remove the 40's and put on a 38DGAS if you really want 40's change the cam to a fast road spec minimum std pinto and 40's will never run properly

[MPETT]

I took my car to Northampton Motorsport where they did a rolling road setup and hey bingo, a tweak to the ignition, balancing of the carbs and a larger idle jet and it runs great! Clearly it would be better with a fast road cam and a full rolling road session, but the engine is still running in after the rebuild.

Knowledge and the right tools is everything. Had heard very good thing about these guys and they didn't dissapoint. I'd strongly reccomend themif you're having carb troubles. Very friendly and knowledgeable chaps.

[Justin S]

As I said, Troy and the guys are great for sorting out issues. 40's should run fine on the engine. People stick 45's on them and the airflow drops off on standard engines.