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Mylespeed
Starting Member

34 Posts

Posted - 15 Apr 2019 :  11:57:58 Show Profile Reply with Quote
I am just about to get my car back from the fettlers and have a quick question: the engine is now 1740cc with appropriate can, head etc. Will the 32/36 carb be up to the job and if not what are the alternatives? Car used mainly for endurance rallies (off to Portugal next week).

GeoffC
V4 Fanatic

United Kingdom
482 Posts

Posted - 15 Apr 2019 :  20:14:00 Show Profile Reply with Quote
The 32/36 will do the job but may need re-jetting. I'm sure there are details on here of which jets to use. Please let us know how you get on in Portugal it would be good to get a new post in the rallying section!
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Iain G
V4 Fan

United Kingdom
138 Posts

Posted - 16 Apr 2019 :  07:28:32 Show Profile Reply with Quote
Assuming you have the 4 stud sport and rally manifold machined and ported correctly to match then..........
Standard 32/36DGV carbs are progressive ie 1 choke opens before the 2nd
You can modify them or buy another which is synchronous opening ie both chokes together
38DGMS carbs are bigger and always synchronous AFAIK - you might need to increase port on mounting flange?
40DFI carbs are even bigger but very rare, very expensive and very old so beware
You can use various DCNF carbs on MSS customised manifold which IMHO should be the best single carb set-up - Ive got one to fit to the sonett sometime


Iain G
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Iain G
V4 Fan

United Kingdom
138 Posts

Posted - 16 Apr 2019 :  07:33:29 Show Profile Reply with Quote
....having said all that.....you should run with what youve got first.....will be fine if set-up well.

Iain G
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GeoffC
V4 Fanatic

United Kingdom
482 Posts

Posted - 16 Apr 2019 :  08:57:02 Show Profile Reply with Quote
I had a 40dfi on my 1531 big valve heads rally car. Worked well but very thirsty, OK for stage rallying but probably better to stick with the progressive for longer endurance events.
As somebody has PUP 96K hidden away somewhere that carb and engine should still exist. Anyone know where it's gone????!!!!

Edited by - GeoffC on 16 Apr 2019 09:00:48
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melle
V4 Guru

United Kingdom
3343 Posts

Posted - 16 Apr 2019 :  11:01:52 Show Profile Reply with Quote
quote:
Originally posted by GeoffC
The 32/36 will do the job but may need re-jetting.
In my opinion, jetting shouldn't be taken for granted for any carb used on any engine. Assuming that what works on one engine will work on another (and it usually does, sort of...), is a recipe for disaster.

www.saabv4.com
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Mylespeed
Starting Member

34 Posts

Posted - 16 Apr 2019 :  16:38:24 Show Profile Reply with Quote
Thanks for all of the help; I will have a word with FastRoadCars to upgrade the jetting on the 32/36.
Having just seen the class we are in for London - Lisbon, I am hopeful rather than expectant: 1x 280Sl, 1 X MGB, 6 x 911 !
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Derek
V4 Guru

United Kingdom
2019 Posts

Posted - 17 Apr 2019 :  11:59:03 Show Profile Reply with Quote
I'm guessing you are getting the error message when you post a reply. I may get one when I post this. It's an ongoing problem. Just ignore it and check 10 minutes later to see if you post is there. It invariably is.
Good luck with your carb. This might help.
http://www.saab-v4.co.uk/speedball/topic.asp?topic_id=3715
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Mylespeed
Starting Member

34 Posts

Posted - 18 Apr 2019 :  10:22:49 Show Profile Reply with Quote
Derek. Exactly that Exactty that Exactly that
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SAAB96L
V4 Beginner

United Kingdom
99 Posts

Posted - 01 Feb 2021 :  17:47:21 Show Profile Reply with Quote
Hello,

I have raised this thread, because it has answered a couple of my questions. However, I am caught between 2x options regarding the choice of Weber 32/36DGV carb.

When all the modifications are done the car will be 1740cc - perhaps a tad more; hence this thread is a useful insight.

Question is: do I go for 32/36 that is jetted for a Ford 1600cc x-flow OR for 32/36 which is jetted to suit a 2L Ford Pinto.

Yes, the carb will need some internals swapped when it finally goes on the rolling road - but what carb is the best start point bearing in mind that my intended engine capacity will be mid-point between the two specs quoted.

I hope to catch-up with Anthony of Fast Road Cars to discuss, but thought I'd ask here to begin with for some opinions.

Many thanks.

Richard.



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Iain G
V4 Fan

United Kingdom
138 Posts

Posted - 01 Feb 2021 :  19:12:40 Show Profile Reply with Quote
Search for dgv 5a on this site will give you basic jetting as a start point.


Iain G
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SAAB96L
V4 Beginner

United Kingdom
99 Posts

Posted - 01 Feb 2021 :  20:21:10 Show Profile Reply with Quote
Thanks Iain.

Regards.

Richard.
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SAAB96L
V4 Beginner

United Kingdom
99 Posts

Posted - 01 Feb 2021 :  20:38:17 Show Profile Reply with Quote
Just searched DGV 5A and there is a very good archive thread with a chart showing various applications of engine tuning and Weber carbs.

Bottom line is that the 2L 32/36 set-up is the best route, as the 1600cc will provide too weak a mixture which will in itself cause issues.

Many thanks.

Richard.
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