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| | | | Joined: Apr 2009 Posts: 159 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 159 | I was just reading the thread about the carb insulator plate and it got me thinking. . .On my old Jeep with a 4.0 inline six engine, I saw some mild power/economy gains by intalling a riser between the manifold and the carb. Basically a tube to lengthen the distance the fuel/air mixture has to go. I have seen some with spirals built into them to cause a "swirl" to get a better mixture of air and fuel.
Has anyone tried this on a stovebolt? I am installing a 292 in my '50 and wondering if it is worth the time and effort to build one for my carb.
Last edited by chevoldsmoyota; 03/22/2011 1:32 AM.
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| | | | | Joined: Dec 2008 Posts: 319 Shop Shark | | Shop Shark Joined: Dec 2008 Posts: 319 | I seriously doubt that any device can impart a "swirling" motion to the air/fuel mixture coming out of a carb. Possibly a very little turbulence on the edges, but not enough to make a difference.
cm
If you can't fix it with a hammer and screwdriver, you need a bigger hammer.1965 Chevy C10 | | | | | Joined: May 2004 Posts: 1,312 'Bolter | | 'Bolter Joined: May 2004 Posts: 1,312 | From what I have read, spacers on V-8's give you a bit of a boost in low-end torque, and help insulate ( phenolic ones anyway ) the carb from engine heat. On a 6 ?? | | | | | Joined: Mar 2005 Posts: 1,513 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,513 | I looked into this some time ago and concluded the following:
A swirl effect is good if it happens as the charge passes the valve for improved cylinder filling but in this case it is too far away likely eliminating any benefit(multiple runner turns downstream). As it is also highly possible that it will generate an annoying whistling noise I decided not to bother.
1952 1300 Canadian 1/2 ton restomod You Tube | | | | | Joined: Dec 2010 Posts: 34 New Guy | | New Guy Joined: Dec 2010 Posts: 34 | I put a plastic (phenolic) one on my V8 Ford to insulate the carb and prevent the fuel from boiling right after shutdown. It's a lot easier to restart in the summer now when I dive into the post office or whatever for a minute or two.
As far as the turbulence effect, I have a buddy who put one on his old Harley and it got rid of the popping and flat spot he had. The Harley has a short intake with a straight shot to the valve, so I can see that helping. I'm not sold on the idea of using one (for the turbulence effect)on a V8 or straight six, since the fuel and air have to make numerous sharp turns before it gets to the valve. So, in my opinion, any turbulence will be lost when the mixture slams into the intake floor or side wall. I would definitely not waste any money on the ones they sell to put in the intake tube behind the air fliter on fuel injected motors. There isn't even any fuel in that area to have to keep in suspension.
46 Chevy 1 1/2 ton
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