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CB466f
Erwin83:
For the record, the machinist has decided to use the Honda spec, as the pistons (according to him) are similar to the original material, and not forged like on high(er) quality tuning-pistons such as mahle etc.
He measured all pistons before boring and concluded that all 4 pistons had exactly the same size. Therefore, he ended up boring the 4 holes at the same size too.
Checked the piston ring gaps, were good too. All-in-all, he was quite impressed with the quality of the Forseti kit.
I paid 315 euro for the service of boring / honing and checking all measurements. A bit more than I expected.
Together with the Forseti kit and a gasket kit for the engine, I will be in for 600 euro + oil and filter.
K2-K6:
Certainly appears that you've had decent work completed to build it with the big bore kit, hopefully you'll have good results. Interesting to hear how you get on.
The brass screws are an interesting subject when used with these engines. For corrosion purposes they are worse than the original materials (zinc plated steel) as brass exists at a greater distance away from aluminium casting than does zinc. Also the brass will effectively corrode / scavenge from the aluminium casting, where the original materials won't. This is often seen when carburettors are left to corrode, the brass components "eat" the predominantly zinc castings.
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Above chart is from this site http://www.corrosionpedia.com/an-introduction-to-the-galvanic-series-galvanic-compatibility-and-corrosion/2/1403 which discusses this subject.
Like many of the Honda design of that era, there are many very small but concise details which attract no immediate attention but are there nonetheless and impact the overall construction unseen. Very clever, those Japanese development engineers :)
Nurse Julie:
I'm pleased you explained that Nigel.... My only offer was to inform Erwin that if he wanted the proper ones as fitted by Honda, I have no doubt we will have them in stock.
Erwin83:
Wow, that’s a good ring of the bell. Thanks for that.
You made me google this for some more background and I see now that this is not a smart choice at all. Although real issues are more expected in a wet environment, which this isn’t really, I will change them out nonetheless.
What is the preferred material for exhaust taps? I always thought people used brass. Or is it copper? Or s my memory failing me completely?
Trigger:
--- Quote from: Erwin83 on November 22, 2019, 01:26:36 PM ---Just picked up the cylinders. Now it's getting real :-X
--- End quote ---
They don't look like std head studs ?
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