csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
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fao all engineer type people.......
right, my c16xe head......the heads coming off soon for the rebuild, what shall i ask to be done for maximum performance??....
so far im requesting,:
*the head to matched to inlet/exhaust manifolds (keeping venturies)
*polished ports
apparently, its advisable i get an extra oilway drilled??....
and posibly the valves ground to a spacific angle....
what is the best comp ratio to get it skimmed to??....10.5/1??
cheers
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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the c16xe head is a very good design anyway. the ports are much bigger than on an x16xe and according to SBD is fine to use as a standard head.
I would spend my money on a good rebuild. had a quote yet for all the headwork?
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
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polish + matching im lookin at £120 trade 
for my crank/flywheel balance & regrind it was £250!!!!.....oh well
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
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so does anyone know of this extra oil drilling i need??.....apparently the x/c16's are common to starve the top end of oil  ..
any ideas??
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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all depends on the plans for the engine spec really.
unless you are getting tb's or mantzel and aftermarket management making the ports huge isnt going to gain much.
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
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well.....just want the ports cleaning really....there still rough from the casting....there seems to be a huge lip where the head meets the 4branch too..
i didnt think it would make much difference wether im planning on a mantzel of not, it still uses the original lower inlet does it not?...
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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but if you spend the money polishing the ports in the head ( a rough finish is better on the inlet, smooth on the exhaust) then to get any gains it is reccomended to do the inlet manifold to match.
think about it, the inlet manifold tract is about 10" long. why polish the last 3" in the head
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
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maybe worth removing the lip on the exhaust side though
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
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hmm...i blame the shoddy protech quality....
but yeah, i see your point with the inlet.....
no ideas on the oilways or valve angle then dave??
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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no need for oilways. mine revs to 8k rpm+ and never had problems with oil starvation.
as for the valve angles, you can get the seat cut to a triple angle, provides a better seal when the valve shuts.
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csweatherston
Member
Registered: 16th Jan 06
Location: Devon
User status: Offline
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cheers for your halp dave
(you have u2u)
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