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By B-rad - 2 Years Ago
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I have a pretty good amount of rust inside my intake manifold that I have off the motor. Is there a good way to remove it? I bought CLR but want to know how to make the best use of it.
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By paul2748 - 2 Years Ago
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Maybe a wire brush on a thin flexible wand that you can put in an electric drill?
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By 55blacktie - 2 Years Ago
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Find a pan/container that's just a bit larger than the manifold, and soak the manifold in a gallon of EVAPO-RUST for a couple of days. If necessary, rinse and repeat. It helps if you can seal the pan/container in which the manifold is soaking. Don't discard the used EVAPO-RUST; it can be reused.
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By Joe-JDC - 2 Years Ago
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Sand blasting is the best way to get rid of all the rust and can be washed out easily afterwards. I try to sand blast all iron intakes after porting them. Do not use glass beads, those will imbed in metal when they crush with air pressure. They will eventually wash out with the fuel and ruin your rings. Some machine shops use steel shot for abrading the parts. That also leaves little steel balls in the runners even after washing. I have tried it all over the 50 years I have ported heads and intakes, and sand blasting and pressure washing afterwards is the best in my experience. The sand leaves a rough surface which promotes keeping the fuel in suspension, and not washing down the port walls. This applies to the Y Block intake iron intake manifolds. If you sand blast another engine family intake that has a pan under the manifold, remove the pan before sandblasting. Here is a SBF I did recently for a Cobra replica build.    Joe-JDC
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By Daniel Jessup - 2 Years Ago
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Try electrolysis - very simple to set up and you can just let chemistry take over and do the work for you.
https://www.hotrodreverend.com/post/rust-restoration-preparing-a-cast-iron-exhaust-manifold
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By 55blacktie - 2 Years Ago
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Many years ago, a friend sandblasted his intake manifold. The result was the same that JDC experienced when using glass beads. If you use any abrasive media, I would make sure the manifold is thoroughly cleaned before and after using an abrasive.
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By darrell - 2 Years Ago
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a guy is giving me a rusty 292 block.im going to try that electrolysis.
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By alanfreeman - 2 Years Ago
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No chemistry or abrasives necessary. Here is a cheap way to easily remove rust on any iron or steel surface. Buy a cheap plastic pail at a dollar store large enough to contain the manifold. Buy two gallons of pool acid (available at any Home Depot) and pour them over the manifold so that it is fully submerged. Let it soak for a few hours and it will come out with fresh metal just like new. Make sure that you neutralize any acid remaining on the metal by flushing the inside and outside with a garden hose. Paint it ASAP before the metal can begin to rust. Using a funnel, pour the used acid back in the gallon containers and you can reuse it on the next rusty project.
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By Joe-JDC - 2 Years Ago
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If you do use acid, don't use it on aluminum, and definitely neutralize it asap. If you leave iron in the acid, it will eat it away over time, and aluminum will turn into mush after a couple of days. It is a common method to use Muriatic acid to acid port iron heads and intake manifolds by brushing the acid into the ports, let it form rust scales, sand blast, repeat the acid, and sand blast, etc. Some folks get really aggressive and pour the ports full of acid and let them set for a week, and many have ruined the heads and manifolds that way. I am not a fan of using acid except as a last resort. Joe-JDC
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By Florida_Phil - 2 Years Ago
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Whatever you choose to do, make damn sure your manifold is 120% clean before you bolt it on. If you sand blast it and any of the sand remains in the intake, it will wipe out your rings and cylinder walls in a NY minute.
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