 790 cams
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Joined: Jan 2005
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Monkey Butt
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OP
Monkey Butt
Joined: Jan 2005
Posts: 7,643 |
Are the cams off the speedmaster 790 the same as the America 790 cams..
Also did the early America's have black cylinder heads, as the one I have bought is black, but the guy insists it was off a 2002 America and not a speedmaster
Ray(UK)
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Re: 790 cams
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Joined: Jan 2005
Posts: 3,753
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 3,753 |
yes they are the same, and no the early ones had silver powdercoat
Frank
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: 790 cams
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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OP
Monkey Butt
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Thanks Frank for the swift reply, so how can you tell the difference between a 790 cam and a 865
Ray(UK)
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Re: 790 cams
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Joined: Jan 2005
Posts: 3,753
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 3,753 |
no idea lol. part numbers and how the lobes look. plenty of pics of 790 cams on here and form what i hear about the 865 cams the differences should be easy to see
Frank
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: 790 cams
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Joined: Jul 2006
Posts: 1,337
Learned Hand
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Learned Hand
Joined: Jul 2006
Posts: 1,337 |
Some of the BB kits have black heads. Think yours has a 904 kit?
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...
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Re: 790 cams
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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OP
Monkey Butt
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Quote:
Some of the BB kits have black heads. Think yours has a 904 kit?
No BB kit, that is why I bought the head and barrels, the barrels measure for standard pistons 86mm so I know it's a 790 but the head is black. This makes me think it is off a Speedmaster rather than a America. But the guy insists it was an America. Will have to check the Cams when I split my America and see..
Ray(UK)
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Re: 790 cams
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Joined: Sep 2005
Posts: 3,816
Freelance Jedi Knight
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Freelance Jedi Knight
Joined: Sep 2005
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head is black must be speedie my head is grey or silver if you want and is 2001. barrels are black .speedie head is black with grinded sides
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Re: 790 cams
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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OP
Monkey Butt
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Quote:
head is black must be speedie my head is grey or silver if you want and is 2001. barrels are black .speedie head is black with grinded sides
My thoughts entirely Greg, but why would he insist its off an America... just means me swopping my cams over after the BB has been done if there is any difference.. 
Ray(UK)
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Re: 790 cams
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Joined: Sep 2006
Posts: 1,457
Learned Hand
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Learned Hand
Joined: Sep 2006
Posts: 1,457 |
Could be off a standard Bonneville... 270 vs 360 the cams would be completely different.
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Re: 790 cams
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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OP
Monkey Butt
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Quote:
Could be off a standard Bonneville... 270 vs 360 the cams would be completely different.
Never thought of that Lon, presume the heads are the same just different Cams..
Ray(UK)
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Re: 790 cams
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Joined: Jan 2005
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Monkey Butt
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OP
Monkey Butt
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OK took some photo's can anyone identify these.  
Ray(UK)
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Re: 790 cams
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Joined: Jul 2006
Posts: 1,337
Learned Hand
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Learned Hand
Joined: Jul 2006
Posts: 1,337 |
Might help is you had a profile shot of a lobe like so... 
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...
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Re: 790 cams
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Joined: Jan 2005
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Monkey Butt
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OP
Monkey Butt
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Closeup of lobes  
Ray(UK)
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Re: 790 cams
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Joined: Aug 2006
Posts: 321
Adjunct
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Adjunct
Joined: Aug 2006
Posts: 321 |
look like a 270 cam to me, here's a 865/360 cam 
There is no greater thrill than being shot at with no consequence. -Churchill
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Re: 790 cams
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Joined: Jan 2005
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Monkey Butt
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OP
Monkey Butt
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You can tell the difference, but is mine a 790 or an 865 (270)
Ray(UK)
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Re: 790 cams
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Joined: Jul 2006
Posts: 1,337
Learned Hand
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Learned Hand
Joined: Jul 2006
Posts: 1,337 |
Its a SWAG, but looks like the 865. 865 cams have 0 overlap which would make them "pointy". Is there a part number on them? I have a shop manual. The stock photo of Thunderbike cams from Brents site look like this 
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...
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Re: 790 cams
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Joined: Feb 2007
Posts: 23,225 Likes: 62
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,225 Likes: 62 |
Hard to tell in the pictures but looks to me like it's a 270 as opposed to a 360 degree cam set by looking at the lobes. Can't tell if they are 790 or 865 for sure. At least I can't from the pictures.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: 790 cams
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Joined: Aug 2006
Posts: 175
Adjunct
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Adjunct
Joined: Aug 2006
Posts: 175 |
From what I can see surely if the lobes from a single cam are pointing in opposite directions [180 degrees] this makes these from a 360 motor...
05 SM Neon Blue/Black. Thunder Bike Cams & Pipes & Flowed Head. AI&Snork removed, Airbox Mods, 135mains, 42/17T, 140x80x17" TBS Front Wheel
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Re: 790 cams
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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OP
Monkey Butt
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A little bit deceiving is that picture looking at the bottom cam the lobes to the right are pointing at 4pm while the others are pointing at 11am, if that helps..
Ray(UK)
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Re: 790 cams
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Joined: Jan 2005
Posts: 6,308 Likes: 4
Worn Saddle
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Worn Saddle
Joined: Jan 2005
Posts: 6,308 Likes: 4 |
Ray,
A lot of shops that do the big bore machine work have heads ready to go, some form SM, some from bA. No difference at all ceptin for the black or silver colors. Cams are same too from 2001 to 2005..
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: 790 cams
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Joined: Jan 2005
Posts: 8,639 Likes: 3
Old Hand
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Old Hand
Joined: Jan 2005
Posts: 8,639 Likes: 3 |
Quote:
Thanks Frank for the swift reply, so how can you tell the difference between a 790 cam and a 865
I haven't seen the 865 cams, but I would think the exhaust lobes would be a lot closet to being pointy looking than the 790 because of the relatively short duration. If you had one of each to look at, you should be able to easily see the difference.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: 790 cams
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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OP
Monkey Butt
Joined: Jan 2005
Posts: 7,643 |
Quote:
Ray,
A lot of shops that do the big bore machine work have heads ready to go, some form SM, some from bA. No difference at all ceptin for the black or silver colors. Cams are same too from 2001 to 2005..
Come on Pat, this is the UK, you cannot buy anything for our bikes like that off the shelf. Infact some of the engineering shops still use a hammer and chisel. 
Ray(UK)
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Re: 790 cams
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Joined: Feb 2007
Posts: 23,225 Likes: 62
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,225 Likes: 62 |
Quote:
From what I can see surely if the lobes from a single cam are pointing in opposite directions [180 degrees] this makes these from a 360 motor...
Thats why I said 270, those lobes don't look straight across to me in the pictures.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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