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There is a NAPA product called "Aluminum Brightener" I have some but not yet tried it. This thread has nice info, now we know what to watch out for!
Given the length of my post it seems crazy to add anything, but...I said the acids would darken the zinc (and aluminum-zinc alloys), but Krud Kutter and the like also darkens aluminum-zinc, it just takes longer.In general the acids etch the metal to get below the dirt whereas the bases (detergents combined with surfactants like KrudK) turn the grease to soap so dirt rinses out. Both will etch the aluminum and darken zinc especially when other metals are present (sacrificial anode). The wild card is that aluminum is commonly alloyed with zinc which seems to darken and soften the alloy - picture old Amal carbs. Zinc is bad - see zinc pest: https://en.wikipedia.org/wiki/Zinc_pest
I have a 30 litre (iirc) ultra sonic cleaner but as far as aluminium cleaner I have only used DuraGloss 851 / 853 to date.You have to be very careful on the material, spray it on the likes of Norton Commando engine cases and there is no problem do the same on a Moto Guzzi case and it will turn them gray very quickly.This is DuraGloss diluted 50/50) , sprayed on and rinsed off as soon as white foam is seen (done 3 x)These PHF's had sat unused since the late 1980s (replaced with 40's,PHM's) and were looking fairly tardy but not oxidised.
Nice work! Thanks for sharing. Is the airbus missing in the photo, or do you have a custom air filter setup?
It has the stock 'Loop air box and rubber boot which match up like stock.The carburetors are vertical and do not hit the gearbox (I machined the manifold gaskets so they were wedge shaped and swung the manifolds/PHF's outward a little away from the gear box to gain clearance)The stock air box did need to be moved rearward by 6 mm but looks near factory (The machined adapters (PHF to rubber boot) got a wrap of black electrical tape to hide them a little)
Well now youve done it, this has as many answers as an "oil thread"......
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