Port & Polish Engine Does anyone Port and Polish their engine when rebuilding or afterwards? Is there any real advantage to doing this on a Model A Engine?
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Re: Port & Polish Engine Why is there a "thumbs down" symbol next to the title in my post?
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Re: Port & Polish Engine No clue on the thumbs down...
As far as port and polish. I doubt it would make much difference, if any, in a stock engine. In a performance engine where you're trying to eek out as much power as you can then it probably would help. |
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Porting and polishing are just one part of a high performance build. On a stock or near stock engine there is no gain, unless there's a casting flaw to smooth out. |
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Re: Port & Polish Engine Well I must give all three of you a "THUMBS UP" for responding and answering my post!
Thanks again!! |
Re: Port & Polish Engine Yes to port and polish, but, I never have with a Model A.
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Re: Port & Polish Engine A definite increase in hp can be had by porting and PORT MATCHING on a stock engine.
Bigger is better. A larger ID intake manifold and carb will add more hp. A exhaust header will add more. Brent mentions the best type surface finish for intakes but in lieu of that a stone finish is next. The exhaust should be polished smooth as possible. |
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Re: Port & Polish Engine I think larger intake valves help more than porting. I have them and they give good power. I also have a Stipe cam and HC head. It all works together.
John |
Re: Port & Polish Engine IMO, porting and polishing a stock Model A engine doesn't make much difference but it does help - a little.
For a real boost to performance, there are the three Cs". Carb, Cam and Compression. A little on each will give amazing results. Porting and polishing helps with the "Carb" part of that. |
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Your choice ! |
Re: Port & Polish Engine I enlarged the intake ports a bit before installing a dual updraft intake manifold and model B carbs on my roadster . I don't polish intake ports on engines that run updraft carbs .
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Re: Port & Polish Engine Hmmm, I posted agreeing with Brent and Pete. Don't know where it went. But it was probably my fault.
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Re: Port & Polish Engine This video is for a single cylinder Flathead motor, but it is similar to the configuration of a cylinder in a Model "A" engine. https://www.youtube.com/watch?v=s-Li-mwjvlg
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The biggest two things that I came out of this video is; 1) there is not any flow numbers on the before and after to see whether he actually did any good. Often times, you can hurt flow by grinding away metal. And 2), the Briggs do not deal with reversion like the Model-A/B engines do because of the Ford's shared intake port. I first became educated on serious horsepower of a flathead from my son's early racing days with a kart and a jr. dragster. The R&D that has been spent in the Briggs world is unreal. . . |
Re: Port & Polish Engine 'The R&D that has been spent in the Briggs world is unreal.'
Boy, I guess so. A good friend became 'crew chief' for his son starting with mic-rods and then go-karts. It surprising how far these guys have taken these B&S engines since I was playing with them in the early 60s. |
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Re: Port & Polish Engine Amazing. I thought if we were getting 7-8 HP out of a 5 HP we were doing good. I think in my friends time they were doing around 20 HP. I can't even think about 40-50 !
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