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Discussion Starter · #1 ·
alright lads!
so i have read the threads on the 790 cams in a 865 motor with interest and i happen to have come by a set of 04 speedmaster cams to try in my super scruxton,I have just been on the fishfinder doing a bit of reserch and it gives half a dozen variuos part nos for all of the 790 motors
does anyone know the oem part nos for the cams that work and the vin range??

someone knows I'm sure!!

Nice one

Adrian
 

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alright lads!
so i have read the threads on the 790 cams in a 865 motor with interest and i happen to have come by a set of 04 speedmaster cams to try in my super scruxton,I have just been on the fishfinder doing a bit of reserch and it gives half a dozen variuos part nos for all of the 790 motors
does anyone know the oem part nos for the cams that work and the vin range??

someone knows I'm sure!!

Nice one

Adrian
I think you may have to stick with 790cc Bonnie cams. The Speedmaster and America have a 270 degree crank, which makes me think the cams from either of these machine will not work in a Bonneville, with the 360 degree crank. Maybe that's something you already know ...??

OK ... is your Scruxton Scrambler or Thruxton-based? (270 or 360?).

And I don't have a clue whether these cams would do anything to improve performance in your engine, provided they work at all.
 

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alright lads!
so i have read the threads on the 790 cams in a 865 motor with interest and i happen to have come by a set of 04 speedmaster cams to try in my super scruxton,I have just been on the fishfinder doing a bit of reserch and it gives half a dozen variuos part nos for all of the 790 motors
does anyone know the oem part nos for the cams that work and the vin range??

someone knows I'm sure!!

Nice one

Adrian

Your engine is the 360 deg, the speedmaster is 270 deg. Those cams won't work. Like Bob said, you'll need cams from a bonnie.
 

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it doesn't really matter what the part # is because you can't get them from Triumph anymore. Unless you get them from a binned motor or some other grey source, your out of luck.
If you want some hot cams then give Carlos at TPUSA a call. He'll hook you up.

the earliest engines had the best cams. Get the cams that match the early engines.
You can try, but you won't be able to get them from factory.
 

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does anyone know the oem part nos for the cams that work
Adrian,
The part no. I have for the 790 Speedie cam is T1141909

But as others have said, dont fit one to your bike!!
It wont work!

As your Scruxton is Thruxton-based it has a 360 degree engine.
The 04 Speedie cam which your looking at is 270 degree.
The two dont go together!!


V.
 

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790 speedmaster cams

Adrian,

Dry your eyes mate :) I'm sure a 'Q' will be forming already for those cams. Any Scrambler owner looking for cheap speed will be glad of them.
 

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I think the cam # you really want is "813". Call Carlos at TP USA. They are currently the best cams for the 360 degree Triumph twin available period. You will not be dissapointed.
 

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I think the cam # you really want is "813". Call Carlos at TP USA. They are currently the best cams for the 360 degree Triumph twin available period. You will not be dissapointed.
+1 I plan on ordering some soon.

I scored some 790 cams from a 2003 bonnie and picked up a solid 6hp over the stock 865 cams, dyno verified. Lost no torque. (Thanks Mike!)
 

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I think the cam # you really want is "813". Call Carlos at TP USA. They are currently the best cams for the 360 degree Triumph twin available period. You will not be dissapointed.
+1 I plan on ordering some soon.

I scored some 790 cams from a 2003 bonnie and picked up a solid 6hp over the stock 865 cams, dyno verified. Lost no torque. (Thanks Mike!)
Sweat,

Back to back dynos, please, so we can put real numbers to the whole 790 vs. 813 cam debate!! Inkslinger may be right, but both you and I got the same HP gains when we fitted 790 cams that TPusa shows on their dyno runs for their 813 cams (when replacing 865 cams)...only a cam shootout using the same bike/dyno will tell the full story.

Cheers,

--Rich
 

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rich the 790 cams wont do what the 813 will.I have run both look at my last duno run its easy to see the 813s work way better at high rpms.The gain you got with yours is about normal going from 865 cams You might gain that much again going from the 790s to the 865 if you your head and carbs are good enough.Those little cr carbs wont feed these motors at high rpm like they should you need something bigger.
 

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Sweat,

Back to back dynos, please, so we can put real numbers to the whole 790 vs. 813 cam debate!! Inkslinger may be right, but both you and I got the same HP gains when we fitted 790 cams that TPusa shows on their dyno runs for their 813 cams (when replacing 865 cams)...only a cam shootout using the same bike/dyno will tell the full story.

Cheers,

--Rich
oh I will, believe me. I actually need to get on the dyno now so I can see what my D&D 2-1 exhaust gained me vs Predators/Thrux headers. I'll report those findings when I get on the dyno. Later, when I get the cams, I'll go back. Should be good data!
 

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rich the 790 cams wont do what the 813 will.I have run both look at my last duno run its easy to see the 813s work way better at high rpms.The gain you got with yours is about normal going from 865 cams You might gain that much again going from the 790s to the 865 if you your head and carbs are good enough.Those little cr carbs wont feed these motors at high rpm like they should you need something bigger.
I absolutely agree with the notion that at the upper RPM scale the CRs are at their limit on my stock head/piston machine...for anyone going BB, they are clearly inadequate. As soon as my dyno guy gets back from vacation, I'm going to get the CR jetting dialed in and get a power run in to see what exactly I gained - if anything.

My question on the cams (790 vs. 813) speaks more to the guys who are only doing bolt on changes/cams and not to those who are going into the head and/or adding higher compression pistons/BBs. For the stock motored guys, I'm unsure of the advantage of the 813 cam over the 790...there's a point where you give up down low to gain up top. For the guys going BB, the extra compression & displacement easily offsets these low down losses. So if you have any inclination that a BB is ever in your future, then, indeed, the 813 is the way to go. In my mind, though, I remain unconvinced of the advantage of one over the other if you have no intentions to ever go deeper into the motor than the cam....

I'll need to look again at your latest dyno...of course, your bike is so far from stock that it probably doesn't translate well to my stocker, but will give me an idea, % wise, of what is happening.


oh I will, believe me. I actually need to get on the dyno now so I can see what my D&D 2-1 exhaust gained me vs Predators/Thrux headers. I'll report those findings when I get on the dyno. Later, when I get the cams, I'll go back. Should be good data!
Hurray for hard data. Facts are always better than speculation...even when they prove my theories wrong!

Regards,

--Rich
 

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Discussion Starter · #14 ·
heres a few part nos for reference what i was after...

T1140950 Camshaft, Sub Assy, Inlet R.R.P $255.51 THRUXTON
T1140960 Camshaft, Sub Assy, Exhaust THRUXTON


T1141909 Camshaft, Sub Assy, Inlet R.R.P $315.70 SPEEDMASTER
T1141915 Camshaft, Sub Assy, Exhaust R.R.P $315.70SPEEDMASTER

T1141909 Camshaft, Sub Assy, Inlet R.R.P $315.70 Ref 1 > Eng No 211132 SPEEDMASTER
T1142160 Camshaft, Sub Assy, Exhaust R.R.P $263.17 Ref 2 Eng No 211133> SPEEDMASTER


T1140909 Camshaft, Sub Assy, Inlet R.R.P $319.53 Ref 1 > Eng No 282963-F2 / 273654-F4 BONNE/T100 RED
T1140915 Camshaft, Sub Assy, Exhaust R.R.P $319.53 > Eng No 282963-F2 / 273654-F4 BONNE/T100 GREEN

T1140950 Camshaft, Sub Assy, Inlet R.R.P $255.51 Ref 1 Eng No 282964-F2 / 273655-F4 > BONNE/T100 SILVER
T1140960 Camshaft, Sub Assy, Exhaust R.R.P $255.51Eng No 282964-F2 / 273655> BONNET/100 SILVER
 

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T1140950 Camshaft, Sub Assy, Inlet R.R.P $255.51 THRUXTON
T1140960 Camshaft, Sub Assy, Exhaust THRUXTON


T1141909 Camshaft, Sub Assy, Inlet R.R.P $315.70 SPEEDMASTER
T1141915 Camshaft, Sub Assy, Exhaust R.R.P $315.70SPEEDMASTER

T1141909 Camshaft, Sub Assy, Inlet R.R.P $315.70 Ref 1 > Eng No 211132 SPEEDMASTER
T1142160 Camshaft, Sub Assy, Exhaust R.R.P $263.17 Ref 2 Eng No 211133> SPEEDMASTER


T1140909 Camshaft, Sub Assy, Inlet R.R.P $319.53 Ref 1 > Eng No 282963-F2 / 273654-F4 BONNE/T100 RED
T1140915 Camshaft, Sub Assy, Exhaust R.R.P $319.53 > Eng No 282963-F2 / 273654-F4 BONNE/T100 GREEN

T1140950 Camshaft, Sub Assy, Inlet R.R.P $255.51 Ref 1 Eng No 282964-F2 / 273655-F4 > BONNE/T100 SILVER
T1140960 Camshaft, Sub Assy, Exhaust R.R.P $255.51Eng No 282964-F2 / 273655> BONNET/100 SILVER

well you can scratch the Thruxton cams cause they suck, the speedy cams cause they won't fit, and based on those prices it would be cheaper for you to get with Carlos and TPUSA and get some good aftermarket cams that are better anyway!

The only way the 790 deal works out to your advantage is if you find a good used pair for cheap.
 

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Discussion Starter · #16 ·
right on lads........well thats that idea down the pan for a bit then.........its off to the pub for the weeknd instead......far better idea!!
 

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These motors want all the cam you can give them even the 813s are on the mild side as far as race cams go .from 3500 rpm on i bet the 813 will show near the same gain over the 790 cams as the 790 cams gain over the 865 cams.You pick up mid range power where you need it.You wouldnt even know my bike wasnt stock normal rideing its smoother then it was stock.What the cams do is make more torque and hold on to more of it at high rpms .790 cams are at there best in the 7000 to 8000 range.The 813 will go to 8500 to 9000 depending on what you have feeding them.500 to 1000 more useable rpm = alot more hp.If you buy new stock cams you wont be saveing much money ether they are over $600.and you wont get the early 790 cams .Since the 813 cams came out the 790 cams are old news lol.
 

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profile data?

Is there some source for the actual cam profile data on the stock/790/813, or even the better aftermarket cams? For what some of these places want for camshafts, you can have a set ground by a reputable race shop, if you have all the necessary info. After all, we're not talking about a V8 shaft here, bike cams are fast $ for a race-prep engine shop... And the ones I know about firmly believe in quality work, their reps being based on WOM.

Just a thought.
 

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The guys doing the testing and finding out what works is what you are paying for .Thats why they dont give much info guys that think like you would just get there own cams ground .Of corse if you want to try maybe 20 or more sets you might find one that works.
You got to pay to play.
 

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I was actually thinking more of the 790 or other OEM shafts. Triumph has no real expectation of propriety in their components, just their bikes as a unit.

Not really a big deal overall. I'm happy with my BB as it is. If I want fast, I can get off my butt and get that old CBR900RR in the corner cleaned up and running again. The local cops have probably forgotten about it by now...
 
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