smoris
Junior Member
Posts: 31
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Post by smoris on Oct 2, 2008 3:48:12 GMT -5
Hi all, This winter i would like to install a 90mm wiseco and a 36 or a 40mm mikuni pumper. I was wondering what cam i use best? I think i am going for a MC but i don't really know what type is best. I will also probably use R&D spring kit with titanium retainers. I usually run my bike from 3000 up to 5-6000 rpm and i don't use it for racing. So what cam do you guys suggest. I dont want to cut the valve pockets of my new wiseco, so it has to fit. and last but not least: what power output can I expect? I hope you guys can help me out with this problem  Greetings Joris |
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Post by solo2racr on Oct 2, 2008 11:42:28 GMT -5
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smoris
Junior Member
Posts: 31
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Post by smoris on Oct 2, 2008 13:21:54 GMT -5
I know, but are there any other types. When I look at the thumperstuff site I see there also is the 251-62 and a 251-40 what is the difference between them and with your suggested 251-30? |
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Post by solo2racr on Oct 2, 2008 15:17:01 GMT -5
Here is a link to Megacycle's webpage for SR, TT, XT500 cams. It gives some good descriptions on each cam they offer. www.megacyclecams.com/catalog/pages/page%2059.pdfHere is the Webcam Camshafts page. Use the search on the left of the page to find info on their cams. www.webcamshafts.com/Between the two, I would go for Megacycle. I don't like regrinds simply because the base circle dia has been decreased and will put the rockerarms at extreme angles. |
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smoris
Junior Member
Posts: 31
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Post by smoris on Oct 3, 2008 2:09:35 GMT -5
thanks solo that was what I needed, now I can see why you advised me the 251-40. All the others need deepening the valve pockets. To bad, cause I seemed to like the 251-30 profile. Thanks for your help. |
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Post by caferacercarl on Oct 6, 2008 3:16:36 GMT -5
Yes, never use a cam with a decreased base circle as the geometry/harmonics/valve speed are all stuffed up, usually valve pockets would only need a millimetre anyway and its cheap to get the next result up the ladder so to speak, good to see someone getting a cam, spring kit,carb and please don't forget a good port job and bigger header pipe etc, perf core muffler and pay for Dyno time to jet it from new, its cheap and insures the engine's life! cheers!
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smoris
Junior Member
Posts: 31
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Post by smoris on Oct 6, 2008 12:27:26 GMT -5
I don't have stock pipe, I actually don't really know what exaust i have, I think it is the muffler from a Triumph or a Norton and a self made header pipe  According to me it is not very restrictive cause it makes lot's of noise about the port job, is it possible to do it yourself with a dremel? I "ported" (read "enlarged" the port) a cilinder head for my honda dax once before, but never something like the SR head. I read the article of the "SR hopping up" where they fully described the porting of an SR head. Maybe removing some material from the roof of the port and some polishing will do the job?? greetings joris |
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Post by marlon on Oct 6, 2008 19:34:27 GMT -5
Smoris, I like the way you think!
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Post by hudriwudri on Oct 7, 2008 16:41:19 GMT -5
Sorry to say otherwise buuut to my knowledge are all the webcam grinds besides one weld ups just like the megacycle. only thing that differs is that they dont offer the weld up rockers. But as carl said try to do / get a good port job because otherwise your spent money on parts might be sent down the drain. :-( Btw. considering youre from belgium i would assume there shold be in belgium plenty of speedway shops that could supply you with a cheap pistonpocket deepening job thus you could use one of the nicer grinds as the 130 which is i know i might repeat myself a formidable all around profile and is very usable also on the streets. kind regards christian |
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Post by solo2racr on Oct 7, 2008 18:31:30 GMT -5
From what I can gather form their respective websites, Webcam offers regrinds and welded cams and Megacycle offers welded or ground on new billet cams.
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Post by hudriwudri on Oct 8, 2008 2:28:22 GMT -5
Hi there,
Nope unfortunately what they refer to as "billet" cams in the particular case of the sr / xt camshaft is just new Yamaha cams that they charge you in case you can not supply them with a core. :-(
kind regards
Christian
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Post by solo2racr on Oct 8, 2008 10:51:15 GMT -5
Your right. I just remembered "Megacycle billet" Not the "Hardface on" preceding it. It would seem, and it would make sense, that it isn't cost effective to produce a blank just for the 500 Yamaha. I'm sure demand is to low to justify it.
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smoris
Junior Member
Posts: 31
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Post by smoris on Oct 9, 2008 1:57:40 GMT -5
Your right. I just remembered "Megacycle billet" Not the "Hardface on" preceding it. It would seem, and it would make sense, that it isn't cost effective to produce a blank just for the 500 Yamaha. I'm sure demand is to low to justify it. so the MC are also regrinds? or am i wrong? because it's starting to be a bit confusing  |
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Post by solo2racr on Oct 9, 2008 2:03:00 GMT -5
Megacycle are all welded either on your old cam or on one of their cams. WebCam has the regrinds.
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Post by hudriwudri on Oct 9, 2008 4:03:39 GMT -5
Hello joris, in trying to explain here are the details: all of the Mc-cams are weld ups and so are there highly recommendable welded up rocker arms. Webcams offers (to my current knowledge now without a catalogue in hand) 3 cams,: WB1: which is just a slightly enhanced stock profile thus resulting in no need to weld upt the lobes for more duration and lift WB2: a welded up profile to my current ( sans catal.) knowledge very similar to the 130 WB3: a welded up profile which resembles an enlarged WB2 Webcam does to my knowledge as of current not weld up rockers which is a pitty since the combination of welded up rockers and cams ist very very good. Hope that explains a lil kind regards christian |
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