Post by: Laverdaroo on March 17, 2023, 08:20:44 PM
As most of you know the bike's in bits again and whilst the lids off I thought it might be a good wheeze to get the cam reprofiled to allow a bit more duration both in and out to improve what midrange there is and basically be a faster bike than Phil's just so I have the mental edge, yer know ;D
Anyway, has anybody had this done and if so where at and at what bonkers cost was it? AND, was it any good post op?
I've sent a message to Newman's but whilst chatting to a few on here a discussion was mentioned with reccomendations and I can remember the thread but cant find it Any avice chap's and chapess's'sss?
Post by: SteveW on March 17, 2023, 09:18:34 PM
Post by: Nurse Julie on March 17, 2023, 09:30:47 PM
Post by: Sesman on March 17, 2023, 09:48:38 PM
Post by: Laverdaroo on March 17, 2023, 10:25:24 PM
I'm interested to see how Steve gets on after his 650 cam install mind? Steve, have you done al the porting required as well or just gone for the cam etc.?I have nothing tho guage against as I've never ridden one but my cam is deffo showing its age and a freshen up wouldnt hurt tbh. If its gonna get a refurb, if poss, I might as well try to get a bot more out of it if material has to be put on, ground off, whatever.
Just a thought ......
Post by: SteveW on March 17, 2023, 10:36:05 PM
Post by: Sesman on March 17, 2023, 10:48:25 PM
Post by: Laverdaroo on March 17, 2023, 10:51:50 PM
Post by: Sesman on March 18, 2023, 07:09:19 AM
Roo, Newman is definitely a good shout as not only will he re-profile , but he’ll case harden too.
Post by: Sesman on March 18, 2023, 07:15:41 AM
Post by: Bryanj on March 18, 2023, 08:14:19 AM
Post by: mickwinf on March 18, 2023, 09:05:35 AM
Post by: SteveW on March 18, 2023, 09:22:52 AM
http://www.chinonthetank.com/2016/05/cb650-cam-in-a-cb550/
Post by: McCabe-Thiele (Ted) on March 18, 2023, 09:53:25 AM
Post by: Johnwebley on March 18, 2023, 10:29:54 AM
John Webley has a Newman Cam in his CB500/4
I bought a SH cam to use as doner,,
asked Newmans for a "fast" road profile,something to increase the grunt above 6K.
it has been succesfull,
the bottom end is still sweet like a pussycat,but as the revs rise it feels better,during normal journeys it breaths better ,cruising between 5 and 6k on less throttle,good fuel economy,60+ to the gallon,
made over taking in 3rd much better,romps up to 9k,
cost about £160
Post by: Laverdaroo on March 18, 2023, 10:57:24 AM
I’d like a bit more poke but don’t we all, (leave it Phil!!
) and really thinking I’ll do this before I put the top end back in. It’s only the duration that changes or are you modifying the timing to suit? Don’t want to open a can of worms and all that…….Sent from my iPhone using Tapatalk
Post by: Johnwebley on March 18, 2023, 11:13:11 AM
Cheers John, that sounds just the thing, did you do any porting work or just the cam install after the re grind?
I’d like a bit more poke but don’t we all, (leave it Phil!!
Sent from my iPhone using Tapatalk
just fitted the cam,
I think they must grind about 1mm of the base of the cams,
its how Yoshimura started in Japan
Post by: Laverdaroo on March 18, 2023, 11:17:08 AM
Cheers John, top info, I sent them an exploratory email last week so I’ll hang on and see what they come back with as a starting point for making a decision.
Much obliged
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Post by: Oddjob on March 18, 2023, 08:32:56 PM
I wanted 5 degree more overlap and 10 degree more duration as it's supposed to wake up the engine mid range. I don't want a cammy engine, just one that's tractable throughout it's range.
I also intend to match the inlet ports and enlarge the roof of the port a little.
Phil did you trim the vac gauge screws so they don't protrude into the inlet tract?
Post by: Laverdaroo on March 18, 2023, 09:35:47 PM
On a plus side, my badges came today so they’re off down to Matt’s when I get two mins to be made smaller and a bit more suited to the bike. For aftermarket, they’re pretty good for the 40 odd quid I paid for them. Heavy though
(https://uploads.tapatalk-cdn.com/20230318/85e029b28da6b302faa1b09eca2970ef.jpg)(https://uploads.tapatalk-cdn.com/20230318/08d3d8284a189bb0b7718f9a2e56aea7.jpg)
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Post by: Laverdaroo on March 18, 2023, 09:36:10 PM
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Post by: Oddjob on March 18, 2023, 10:38:27 PM
I have some around somewhere but they seem to have gone missing.
Post by: Laverdaroo on March 18, 2023, 10:41:06 PM
Weren’t you fiddling about with different types ad foul to get the twinkle?
If so, how did that go???
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Post by: Oddjob on March 18, 2023, 10:44:10 PM
I'll put a pic up if I remember.
Badges are on the back burner whilst I do the bits coming back from Camcoat.
Post by: Laverdaroo on March 18, 2023, 10:47:39 PM
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Post by: Sesman on March 19, 2023, 07:23:53 AM
[/quote]
No, Ken. The replacement s/s items were a little shorter. I just rolled the ends on a grinder to taper them. TBH I didn’t spend a lot of time, I just port matched and cleaned up the casting flashing in the inlet ports then raised the inlet roof around the valve entry by a 1mm or so. I left the exhaust alone, apart from removing some obvious casting irregularities. TBH, with no real background knowledge or evidence, I’m not expecting great things…...I took the Tips from Mike Reik on the USA website (think that’s his name).
Post by: Sesman on March 19, 2023, 07:32:15 AM
Post by: Bryanj on March 19, 2023, 10:17:27 AM
Post by: Laverdaroo on March 19, 2023, 10:35:55 AM
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Post by: Sesman on March 19, 2023, 12:06:48 PM
Post by: Bryanj on March 19, 2023, 01:21:39 PM
Does that help
Post by: Laverdaroo on March 19, 2023, 01:52:42 PM
Dropped you an emai yesterday Bryan :)
Post by: Bryanj on March 19, 2023, 02:32:42 PM
Post by: Laverdaroo on March 19, 2023, 02:49:14 PM
Thought i answered mate
Ah, best have a look then, I'm getting loads of stuff being sent to the spam box just recently. I'll have a mooch through it bud. Cheers