headwork aka port & polishing info - Page 6 - BMW S1000RR Forums: BMW Sportbike Forum
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post #51 of 220 (permalink) Old 11-08-2012, 09:03 PM
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Question: was the chamber modified or is that bmw factory machine work marks on it?

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post #52 of 220 (permalink) Old 11-08-2012, 09:04 PM Thread Starter
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Quote:
Originally Posted by russianvr4 View Post
Question: was the chamber modified or is that bmw factory machine work marks on it?
thats a factory cnc'd bmw chamber...
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post #53 of 220 (permalink) Old 11-08-2012, 10:25 PM
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badass! are the ports cnc'd from the factory or just raw casting?

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post #54 of 220 (permalink) Old 11-08-2012, 10:52 PM Thread Starter
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Originally Posted by russianvr4 View Post
badass! are the ports cnc'd from the factory or just raw casting?
the ports are just cast... on the first page it shows a pic of where he started porting and you can see the cast finish..
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post #55 of 220 (permalink) Old 11-09-2012, 12:12 PM
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Really long forward to dyno results on this. I hope you're not doing any other mods at the same time so we can have a good comparison.
Second that!
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post #56 of 220 (permalink) Old 11-09-2012, 12:54 PM
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Interesting that they machined the chamber but not the ports like on their m cars

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post #57 of 220 (permalink) Old 11-09-2012, 01:05 PM Thread Starter
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Originally Posted by russianvr4 View Post
Interesting that they machined the chamber but not the ports like on their m cars
i would guess it was done to keep the cost down and improved flow wasn't needed to make the 193 advertized hp. i was also told back in 2009 they changed the port size and cams in effort to reduce horsepower as the pre-production models made 15-20hp more. who really knows the actual truth to it all. when Nigel was alive he let me in on a lot of insider info that wasn't discussed.
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post #58 of 220 (permalink) Old 11-17-2012, 11:03 PM
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Do the decked heads run okay on 93 octane (10% of it being that **** they call ethanol)? What is the compression ratio?

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post #59 of 220 (permalink) Old 11-17-2012, 11:14 PM Thread Starter
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Yes , decking the head and pump gas is ok. I plan to run pump gas with a decked head and a thinner head gasket.
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post #60 of 220 (permalink) Old 11-27-2012, 03:23 PM
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Any update on final dyno numbers for this build?

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