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Author Topic: Help! 40dcnf jetting  (Read 715 times)
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Dynomax
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« on: December 11, 2023, 05:38:08 PM »

I'm looking for a bit of a starting point for the jetting of a 40dcnf on a Volumex. I've fitted the carburetor and got the car running pretty well but it sounds like it's pinking slightly accelerating from lowish revs. It didn't do this on the original carb so I'm thinking that the timing is OK.
I've just installed an AFR gauge so should be able to get the mixture right but don't know what size chokes and jets I should be starting with just to get a head start.
I've seen a post on here that listed the jets that is a good starting point but I'll be dammed if I can find it now I need it.
Can somebody point me in the right direction?
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WestonE
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« Reply #1 on: December 12, 2023, 06:59:24 PM »

This is listed in Guy Crofts first book which I seem to have hidden well in my house move! Hopefully someone who can actually find it will share it with you. You will want to go to a Rolling Road to set it up properly.

Eric 
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Dynomax
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« Reply #2 on: December 12, 2023, 10:28:28 PM »

Thanks Eric, I've been looking for a copy of Guy's book but so far not much look. As you say hopefully someone has a copy and reads this post and let's me know the recommended starting position.
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smithymc
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« Reply #3 on: December 13, 2023, 11:17:27 AM »

You mean this?

Mark


* thumbnail_IMG_8196.jpg (493.85 KB, 1440x1920 - viewed 113 times.)
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Dynomax
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« Reply #4 on: December 13, 2023, 07:55:06 PM »

Hi Mark, yes that's the sort of thing, however I don't see the Volumex on there and it's only 1 40 DCNF not 2.
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smithymc
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« Reply #5 on: December 14, 2023, 11:30:57 AM »

There isn't anything else I can see in my edition of the book that discusses carburation on a vx other than the extracts below.

Hope they help.

Mark


* vol2.jpg (710.42 KB, 1440x1920 - viewed 95 times.)

* Vol1.jpg (735.29 KB, 1440x1920 - viewed 99 times.)
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rossocorsa
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« Reply #6 on: December 14, 2023, 12:24:41 PM »

Are you using the standard inlet cam or have you changed it? Many folk have fitted a standard 2 litre inlet camshaft or a fiat 130tc one, this will in theory make a decent difference. The choke needs to be relatively small, around 28mm, that is what I have on mine but it's yet to be tested in anger but it seems to run well out of the car.

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Dynomax
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« Reply #7 on: December 15, 2023, 09:03:52 PM »

I have a 2.0 ie  camshaft, just waiting for vernier pulleys.
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Dynomax
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« Reply #8 on: December 15, 2023, 09:07:20 PM »

There isn't anything else I can see in my edition of the book that discusses carburation on a vx other than the extracts below.

Hope they help.

Mark
Thanks Mark that's good.
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