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View Full Version : To polish or not too???



cabanadan
04-15-2010, 05:59 PM
Am getting ready to restore an old double ironhead engine dragbike and was wondering if polishing the cases (originally unpolished) was a good idea??? Will the polishing take away from it's prominance??? Anybody help???

Jerry Wieland
04-15-2010, 06:43 PM
No polish!!!

Robert Luland
04-15-2010, 07:35 PM
Am getting ready to restore an old double ironhead engine dragbike and was wondering if polishing the cases (originally unpolished) was a good idea??? Will the polishing take away from it's prominance??? Anybody help???

I agree with Jerry. One youíre going to ruin a piece of history and second of all your doing is reducing the amount of heat the unit can dispel. If you take a furnace filter thats pleated rather than a flat one. It gives you more surface area. Thatís what all those casting bumps give ya. Bob L

bmh
04-15-2010, 07:40 PM
If we put time into polishing the cases on a race motor, it was only the inside. Though I have seen some flashy guys with big budgets doll em up on the outside as well. Heat dissipation isn't that big of a concern when the motor only runs a couple minutes at a shot.

Paps
04-15-2010, 07:55 PM
Polishing can reduce strength. It is like unto machining material away, yet in lesser amounts. A case is under material stresses. When you add additional machining, or in this case polishing, you actually cause the case to move about, or should I say, distort its shape. If the distortion is to great, machined original surfaces are disturbed and moved out of location. If appearance was the ojective, polishing, IMHO, should have been performed before all the machine work was done on the case in the very begining, as a raw casting. Paps

cabanadan
04-16-2010, 09:46 PM
Thanks for the info.... Will not be getting them polished!!!