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T140 Camshaft on a T120 #88041
02/10/06 12:06 pm
02/10/06 12:06 pm
Joined: May 2005
Posts: 201
sweden
dogge Offline OP
BritBike Forum
dogge  Offline OP
BritBike Forum
Joined: May 2005
Posts: 201
sweden
Hi..
im wondering if this camshaft.
71-3011/71-3012 from a triumph T140 750
i belive it is from a T140-73

Will they work fine in a T120 -69 with a Morgo big bore 750 on it?
and should I use the valv timing for T120 or T140??(opening/closing off the valves)

anyone ho now if this camshafts are any good?
nitrited??

or do you have any ideas what good cams i should gett instead

Doger. help

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Re: T140 Camshaft on a T120 #88042
02/10/06 1:25 pm
02/10/06 1:25 pm
Joined: Dec 2004
Posts: 9,332
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,332
Scotland
Read this thread first before deciding what to do, you are more than likely going to be leaving the cam alone but you decide.

http://www.britbike.com/ubb/noncgi/ultimatebb.php?/ubb/get_topic/f/13/t/003558.html

Re: T140 Camshaft on a T120 #88043
02/10/06 4:11 pm
02/10/06 4:11 pm
Joined: Aug 2001
Posts: 1,081
Cheshire UK
Phatt Bob Offline
BritBike Forum member
Phatt Bob  Offline
BritBike Forum member
Joined: Aug 2001
Posts: 1,081
Cheshire UK
Hi dogge, this is about where I was in 1988, at the start of the slippery tuning slope (which ended with a full drag race spec 850 weslake motor)
My standard T120 ran low 14s over the quarter. With the Morgo kit, skimmed head and the T140 inlet cam it ran high 12s.
Other T140 cam numbers to look out for are 70-7016 and M20416.

It's a good mod which will give an increase in performance and still be OK on the road.

I'm going to send you an article off line, written by a top sprinter, which has a few more ideas. As I recall, even when the article was written and published in "the Sprinter" Triumphs had fallen from favour as 1/4 mile bikes.

Cheers

Bob


Phatt Bob
'95 Daytona 1200
'98 Daytona 1200 dragbike
ex-850 T140 Caff Racer, 850 Triton, Morgo T120, Starfire and Pretend Daytona 500 owner
Re: T140 Camshaft on a T120 #88044
02/10/06 5:53 pm
02/10/06 5:53 pm
Joined: Dec 2005
Posts: 84
Central, NJ
C
caffeine Offline
BritBike Forum
caffeine  Offline
BritBike Forum
C
Joined: Dec 2005
Posts: 84
Central, NJ
i would be really interested in that article!

Re: T140 Camshaft on a T120 #88045
02/11/06 2:40 am
02/11/06 2:40 am
Joined: Aug 2005
Posts: 1,211
Tulsa, Oklahoma, USA
S
Steve in Tulsa Offline
BritBike Forum member
Steve in Tulsa  Offline
BritBike Forum member
S
Joined: Aug 2005
Posts: 1,211
Tulsa, Oklahoma, USA
I am interested too.
Please?


Steve in Tulsa
Re: T140 Camshaft on a T120 #88046
02/15/06 6:32 pm
02/15/06 6:32 pm
Joined: May 2005
Posts: 201
sweden
dogge Offline OP
BritBike Forum
dogge  Offline OP
BritBike Forum
Joined: May 2005
Posts: 201
sweden
I dont know if i getting this right..
is it like this..
if i have a T140 inlet cam 71-3011
(same as 70-7016)?
and a exhoust cam from a T120 E3134

Then it gonna look like this or??
***********************************
Intake Exhoust
Open Closes Opens Closes
40 74 55 34
***********************************
can this realy work..looks strange?

Re: T140 Camshaft on a T120 #88047
02/16/06 3:23 am
02/16/06 3:23 am
Joined: Aug 2005
Posts: 1,211
Tulsa, Oklahoma, USA
S
Steve in Tulsa Offline
BritBike Forum member
Steve in Tulsa  Offline
BritBike Forum member
S
Joined: Aug 2005
Posts: 1,211
Tulsa, Oklahoma, USA
E 3134 is the intake 34 -58 degress
E 4819 is exhaust 58 -34 degrees
your degree listings are more like the Harmon Collins #9 or like the Kenny Harmon #15


Steve in Tulsa
Re: T140 Camshaft on a T120 #88048
12/14/07 2:11 am
12/14/07 2:11 am
Joined: Jun 2007
Posts: 152
Honolulu, Hawaii, USA
mecchanica Offline
BritBike Forum
mecchanica  Offline
BritBike Forum
Joined: Jun 2007
Posts: 152
Honolulu, Hawaii, USA
The lift and duration of the T140 camshaft requires the use of STD tappets (3/4"radius). The T120 or T140 exhaust can use the R tappets, but using the STD items softens the tune and extends the life of the cam and tappet, with little reduction in performance. The T140 inlet camshaft does NOT have the holes for the timed crankcase breather which the 69 uses, you will have to vent the crankcase some other way. The IN T140/EX. T120 set up works very well in either the T120 or the T140 by installing a nitride-hardened exhaust cam from a 69-72 650.
The Kenny Harmon/JOMO 15 is now made by Megacycle as the 51015. Good cams for either short or long rod street 750 with at least 9.5CR and relatively free flowing exhaust. I run the JOMO 15s with a Routt kit on a 68 bonneville converted to a TR6 with 32mm carb. Best bike I've ever owned. Dead reliable.


What, me worry?
Re: T140 Camshaft on a T120 #88050
12/16/07 2:55 am
12/16/07 2:55 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
BritBike Forum member
Tiger  Offline
BritBike Forum member
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Hi Kim, Merry Christmas. bigt


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: T140 Camshaft on a T120 #88051
12/16/07 2:15 pm
12/16/07 2:15 pm
Joined: Dec 2004
Posts: 195
Lancs, UK
Peter Jones Offline
BritBike Forum member
Peter Jones  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 195
Lancs, UK
I'm reading this with interest, I have a t120 exhaust cam waiting the day (may be a while) to be fitted whenever the engine gets worn enough to be stripped down on the t140. (hopefully I've plenty of time yet to collect nice bits to fit)

I do like a nice burst of accelleration (and noise) every now & then to put the hot hatch drivers in their place laugh

Re: T140 Camshaft on a T120 #88052
12/17/07 10:08 am
12/17/07 10:08 am
Joined: Dec 2006
Posts: 67
Lincoln, England
Bobsimmo Offline
BritBike Forum member
Bobsimmo  Offline
BritBike Forum member
Joined: Dec 2006
Posts: 67
Lincoln, England
I have just finished building a T140 engine, and I have fitted T120 inlet and exhaust cams (along with timing-side roller). I was advised that the inlet would provide better torque than the 'race' T140 inlet. Everyone knows the story about the de-tuned exhaust, which is usually changed on its own. I used the same timing set-up as the standard T140, which if I remember right, is the same as 'Steve in Tulsa' suggested. It runs great, but I haven't taken it on the road yet. Will report back when I have. So far (touch wood) it is the first time in the 20 years I've had the bike that it isn't leaking oil!


76/78 T140 Bonnie, Suzuki B-King and Kawasaki ZZ-R1400.
Re: T140 Camshaft on a T120 #88053
12/17/07 2:30 pm
12/17/07 2:30 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member
Joined: Aug 2007
Posts: 4,542
Kent UK
Excellent stuff Bobsimmo, glad to hear it's going well. I have the same cams lined up for my rebuild too, so I'm really interested in your comments on the bike when you ride it. I am also interested in whether it stays oil tight and what sealant you use!

Dog - I had a very similar setup once, spitfire inlet and 3134 exhaust with morgo on a T120, good spread of power and quite a bit better in the higher revs for sure.

Blapper redwine

Re: T140 Camshaft on a T120 #88054
12/18/07 12:56 am
12/18/07 12:56 am
Joined: Jun 2007
Posts: 152
Honolulu, Hawaii, USA
mecchanica Offline
BritBike Forum
mecchanica  Offline
BritBike Forum
Joined: Jun 2007
Posts: 152
Honolulu, Hawaii, USA
Mele Kalikimaka Tiger....How you doin', mate? Same to you all, enjoy the holidays. I just got my prezzie....a 67 T120 bottom end on eBay with light crank, Carrillo rods, some sort of new hot rod cams, new bearings, complete gear set, timing cover, and a new Aerco Big Bore cylinder sans pistons.
I guess I should wait until it gets here and I get a look at it to get all revved up.


What, me worry?
Re: T140 Camshaft on a T120 #88055
12/18/07 1:06 pm
12/18/07 1:06 pm
Joined: Dec 2004
Posts: 195
Lancs, UK
Peter Jones Offline
BritBike Forum member
Peter Jones  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 195
Lancs, UK
When I eventually do fit the t120 ex cam, I wouldn't like to lose low/mid range grunt, so may look out for a less wild inlet. (not that I chug around, mind) smile

Re: T140 Camshaft on a T120 #88056
12/20/07 7:01 am
12/20/07 7:01 am
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member
Joined: Aug 2007
Posts: 4,542
Kent UK
Peter; got a roller main for the timing side in stock? You'll need it.
I have late T120 cams waiting for my rebuild - the 650's weren't exactly breathless up top?

Blapper redwine

Re: T140 Camshaft on a T120 #88057
12/20/07 11:18 am
12/20/07 11:18 am
Joined: Dec 2004
Posts: 195
Lancs, UK
Peter Jones Offline
BritBike Forum member
Peter Jones  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 195
Lancs, UK
Does the T140E not already have a reinforced/improved roller bearing ?

To be honest it may be a while before it gets stripped down, I'll be collecting bits as and when I can so hopefully when I do it it can be done and dusted with a minimum of fuss laugh

Re: T140 Camshaft on a T120 #88058
12/20/07 12:48 pm
12/20/07 12:48 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member
Joined: Aug 2007
Posts: 4,542
Kent UK
Only on the drive side. Hence the camshafts being as they are - I'm sure you know the story.

I have had Kirby Rowbottom (he of the controversial oil filter system) make me up a pair of superblend bearings for the rebuild. It involves some grinding of the bearing to use it on the timing side.

You can buy rollers for the timing side for about 35 though I think? Don't leave home without it smile

Blapper redwine


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