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Update on Intermediate Plate Posted by eric in vermont [Email]  (#2058) [Profile/Gallery]
(more from eric in vermont) on Wed, 18 Jun 2025 13:52:13
In Reply to: Re: Finally got a 2 bbl intake manifold!, eric in vermont [Profile/Gallery]
, Tue, 17 Jun 2025 11:52:22
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I reached out to one of my most experienced and trusted VSaab friends Stefan and asked him about the intermediate plate. Here's his response:
Yes, I have run the Sonett both with and without an intermediate plate. The current setup is a Solex 40 PII on a Jack Lawrence custom manifold that does not have an intermediate plate. In years long past, I ran a Weber 40 DFI with a couple different homemade intermediate plates, the final one was even tapered to level the carburetor to prevent stalling under heavy braking. That plate had a small hole with a threaded port for the PCV valve.
The current setup doesn't have a PCV valve, instead it is vented partially to atmosphere and partially to a catch can. The crankcase ventilation catch can is required by the race organizations I run with.
For a street driven car, I would do as you suggest and port the PCV valve into an intake runner. (There's a specific runner number that is best for this, but I can't remember which one that is right now.) For the carburetor, I would install a phenolic spacer under the carb to insulate it from the manifold. That's not really a problem on a racecar, because you run through so much fuel so fast it never really has time to heat up the fuel. A street car spends a lot of time idling hot at lights and the insulating plate is a wise precaution.
If a phenolic spacer can't be sourced, raw material can be bought from a place like MacMaster Carr and machined with hand tools. I also expect there's probably a great 3D printing material available that has both high temp tolerance and low heat transfer properties, but I haven't explored that option yet. It is intriguing though, as that opens great possibilities for a complex design with airspace inside that can't be made via traditional machining methods.
, Tue, 17 Jun 2025 09:12:27
, Wed, 9 Jul 2025 18:59:08, Tue, 17 Jun 2025 08:39:52, Tue, 17 Jun 2025 09:56:02, Tue, 17 Jun 2025 11:52:22, Wed, 18 Jun 2025 13:52:13 <-- Viewing This Message, Wed, 18 Jun 2025 16:57:18
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