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> Velocity Stacks for 40IDF Carbs - Can't find them
Houston
post Jan 20 2014, 06:55 PM
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I have been using velocity stacks on my 40IDFs which are actually 44mm in diameter. I started looking for some that are actually 40mm and cant seem to find any. Anybody know where to source them or if they are not available, what are you using? I have had one suggestion to chamfer the top of the carb as a transition but I dont like that idea. By the way, I am using the 6" tall ones to put me in the 6K rpm range.

Thanks for any suggestions.
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jockellis
post Jan 24 2014, 12:04 PM
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Actually, the six-inch are for lower rpm from what I've read and experienced with velocity stacks like yours on my SC and 912. The ones like the on my SCCA sponsors' '64SC which finished 3rd overall at the '64 Marlboro 6-Hour were for high rpm and were nothing but the parabolic tip. For high rpm you want short stacks, long manifolds and a short exhaust. Again from what I've read and experienced.
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Houston
post Jan 27 2014, 08:13 AM
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QUOTE (jockellis @ Jan 24 2014, 09:04 AM) *
Actually, the six-inch are for lower rpm from what I've read and experienced with velocity stacks like yours on my SC and 912. The ones like the on my SCCA sponsors' '64SC which finished 3rd overall at the '64 Marlboro 6-Hour were for high rpm and were nothing but the parabolic tip. For high rpm you want short stacks, long manifolds and a short exhaust. Again from what I've read and experienced.


The total length from the top of the stack to the valve is the important distance. My 6 inch stacks give me the sweet spot at just over 6000 rpm. I have just started using a new cam and will need to shorten the stac to get me in the 7000 range.

The issue here is finding a stack that is 40 mm in diameter to perfectly match the bore of the carb. I can't find any for sale but I bet other racers are doing something to match bores.
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Racer Chris
post Jan 30 2014, 02:47 PM
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QUOTE (Houston @ Jan 27 2014, 08:13 AM) *
I can't find any for sale but I bet other racers are doing something to match bores.

For my race car I opened up the bores in the top plates of my 40IDFs, and tapered them to match the v-stacks.
Then I removed the rings around the secondary venturis to increase flow capacity above the throttle plates.

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Houston
post Feb 3 2014, 10:20 AM
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Thanks Chris, Im going to talk to the guy that flowed my heads. Ill see what approach he thinks is best. If we go with modifying the carbs, Ill let you know what the flow bench says, unless you already know.

BTW, I thought it was interesting that in another post you implied the Solex flow better out of the box thank the Webers.
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Racer Chris
post Feb 3 2014, 11:15 AM
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QUOTE (Houston @ Feb 3 2014, 10:20 AM) *
Thanks Chris, Im going to talk to the guy that flowed my heads. Ill see what approach he thinks is best. If we go with modifying the carbs, Ill let you know what the flow bench says, unless you already know.

BTW, I thought it was interesting that in another post you implied the Solex flow better out of the box thank the Webers.

I don't have any flow bench data on carbs.
My opinions are purely subjective, based on observations and a good working knowledge of airflow principles.
That and the fact my 1.8L race engine with 40IDFs (reworked by me) pulled over 180hp on an engine dyno at less than 7500 rpm.
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post Nov 2 2017, 11:48 AM
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post Nov 2 2017, 11:49 AM
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post Nov 2 2017, 11:50 AM
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post Nov 2 2017, 11:51 AM
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post Nov 2 2017, 11:54 AM
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