Does porting and polishing help an engine?
12-08-2004, 10:56 PM
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Does porting and polishing help an engine?
As most of you know I am getting ready to buy an engine for my 'wild thing'. I was wanting an engine that would reach 50mph but I am not going to spend that kind of money. If I port and polish a O.S. .21 engine will that help make more power. Any help would be great.
12-09-2004, 12:49 AM
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RE: Does porting and polishing help an engine?
Yes, if you know what you're doing. Don't ask me, I don't know![sm=spinnyeyes.gif] That is one place that I leave well enough alone except for doing a little port matching on the exhaust. I would leave that part to those who are knowledgable or brave enough to mess around in there.
12-09-2004, 09:41 AM
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RE: Does porting and polishing help an engine?
Well of course I wasn't going to do it myself. We know someone that knows someone that did all his engines for him.
12-09-2004, 10:41 AM
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RE: Does porting and polishing help an engine?
Port timing and some internal smoothing of the flow passages will help an engine. It can also make it a very difficult engine to run consistantly, being affected by temperature, humidity, and barometer. As Ron indicated, it has to be done by someone with the proper tools and knowledge about the impact of each change. You can do more damage than good if your guy just goes in there and randomly takes out metal.
Will it make an OS .21 push the Wild Thing to 50 MPH? I highly doubt it. Good racing engines like the Nova Rossi, CMB and MAC are in the high 40's. I recall reading somewhere that a Wild Thing with a CMB and a straight away prop setup was near 50. Speed does not come without cost and attention to detail in building and setting up the boat.
Will it make an OS .21 push the Wild Thing to 50 MPH? I highly doubt it. Good racing engines like the Nova Rossi, CMB and MAC are in the high 40's. I recall reading somewhere that a Wild Thing with a CMB and a straight away prop setup was near 50. Speed does not come without cost and attention to detail in building and setting up the boat.
