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Old 01-01-2008, 02:15 PM   #1
sickboi55
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Default triumph cams

what are the e2478 cams? are the they stock pre unit cams?
Thanks,
Travis
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Old 01-01-2008, 03:14 PM   #2
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Default Re: triumph cams

Are you sure that # is right. I cannot find it anywhere in my books. My books say stock pre unit is E 3325 or 3134, but then again sometimes my books don't know anything....

Andy
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Old 01-01-2008, 03:44 PM   #3
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Default Re: triumph cams

i know i know. have every book on cd and it's not in any of them.
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Old 01-01-2008, 03:48 PM   #4
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Default Re: triumph cams

i just rechecked... they read as follows E2478 MF A1. maybe they are some super top secret factory race shit.HA! did any after market companies use the "E" prefix? i though that was just a triumph thing
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Old 01-01-2008, 03:58 PM   #5
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Default Re: triumph cams

Travis have you tryed pm'ing Dragon to pick his brain?? Just a thought..
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Old 01-01-2008, 04:25 PM   #6
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Default Re: triumph cams

I got no idear on this one.

If Wes cant help maybe call Jon Berglund on the phone, I think he just changed emails from whats on his site... http://www.countrysidecycle.com/engines.htm


Then again I see you ask everything on Britbike also, John Healy will know...
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Old 01-01-2008, 06:47 PM   #7
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Default Re: triumph cams

i dont think i posted that on there, but hell i might as well try.
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Old 01-02-2008, 07:48 AM   #8
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Default Re: triumph cams

this list here, was posted by john healy (i believe) on the BB forum. your cam isn't on it, and i was under the impression that this list was pretty complete.

Group 1 — High Performance - E3134 "Q" Cam Form
Part # Code Casting # Timing Detail
E3134 E3134 I0 34° BTDC - IC 55° ABDC - EO 55° BBDC - EC 34° ATDC Inlet or exhaust
E4819 X E3134 " " " " Inlet 5047 YCP E5048 " " " " Exhaust E5162 XCP E4602 " " " " Inlet
E10040 XN E10040 " " " " Inlet
E10041 YN E10041 " " " " Exhaust
E4038 SG E3838 " " " " Inlet
E4039 E3838 " " " " Exhaust
E4678 E4679 " " " " Inlet
E5044 YCP E5045 " " " " Exhaust
E5047 Y* " " " " Exhaust
E5163 CP E4679 " " " " Inlet
E6965 Y E6642 " " " " Exhaust
E10043 N E10043 " " " " Inlet
El 0047 E10050 " " " " Exhaust
E11063 N 71-0040 " " " " Inlet
E11064 N 71-0043 " " " " Inlet
E9983 YN 70-9986 " " " " Exhaust
E9984 YN 70-9987 " " " " Exhaust
E9989 YN 70-9990 " " " " Exhaust
Note: 1. Running clearance .002 in. intake and .004" exhaust.
2. Take readings at .020 in. follower lift with "std" radius (3/4 in.) followers
3.
lace>LobeCenterlace> 100.5°
4. Duration 269 °
5. Lift .314 in.
Group 2 — High speed touring - E3325 Cam Form
E3325 E3325 IO 27° BTDC - IC 48° ABDC - EO 48° - BBDC - EC 27 ATDC Inlet or Exhaust
E4818 X E4997 " " " " Inlet
E4848 Y E4560 " " " " Exhaust
E4855 Y E4561 " " " " Exhaust
E4931 " " " " Inlet
E4022 SG E3838 " " " " Inlet
E4023 E4679 " " " " Exhaust
E4786 Y E4679 " " " " Exhaust
E10046 YN E10049 " " " " Exhaust
Note: 1. Running clearance .002 in. intake and .004" exhaust.
2. Take readings at .020" follower lift with "std" radius (3/4 in.) followers
3. Lobe center 100.5°
4. duration 255°
5. Lift .296 in.
Group 3 — Ramp cam form (standard) — Quieting ramps
E3275 E3265 IO 26.5° BTDC - IC 69.5° ABDC - EO 61.5° BBDC - EC 35.5° ATDC Inlet or Exhaust
E3838 SG E3838 " " " " Inlet
E3839 E3838 " " " " Exhaust
E5341 Y E5342 " " " " Exhaust
Note: 1. Running clearance .010 in Intake and Exhaust.
2. Take readings at .020" follower lift using “std” followers.
Group 4 — Modified ramp form (racing)
Thruxton Bonneville
E4220 E4220 Valve lift at TDC with nil clearance 0.195/0.175" Intake or Exhaust
E6267 E4220 Valve lift at TDC with nil clearance 0.205/0.215" Intake
E6147 Y E6146 Valve lift at TDC with nil clearance 0.165/0.175" Exhaust
Note: 1. Running clearance E4220 .008 in. E6267 & E6147 .013 in.
2. Valve timing taken in inches of VALVE lift at T.D.C. with valves set at nil clearance for checking.
3. E6267 and E6147 must be used with 3" radius cam followers and special guide blocks.

Key to Codes: X = Breather Y = Contact breaker n = nitrited CP = Copper plated SG = Spiral gear (distributor drive)
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Old 10-08-2009, 10:01 AM   #9
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Question Re: triumph cams

As the title fits, i'll resurrect this instead of starting a new one.


I'm combining a '67 T100T motor's internals (cracked cases etc) with the cases and crank off a '73. Digging out the cams gave E4678 stamped on the intake, exhaust is E5045.
Both can be found in the "Group 1 — High Performance - E3134 "Q" Cam Form" of 2_wheel_nation's post above.

Anybody know about cams for the unit T100's? I want to make sure it has some oomph, and I am going to be using dual 626's. The T100T had a single 930 fitted earlier. Are these cams worth using? T100C or T100T/R?

Any input appreciated.

Last edited by Arcturus; 10-08-2009 at 10:40 AM.
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Old 10-09-2009, 12:41 AM   #10
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Default Re: triumph cams

Cam forging blank numbers
-------------------------
These are not cam numbers, they are the part number for a blank that a
cam profile is ground onto. A single blank will often be used for a
number of different cam grinds, so this number doesn't actually tell
you what cam you have. The forging number should have raised numbers,
the cam grind number should be stamped in. Either number is sometimes
omitted.
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Old 10-09-2009, 09:36 PM   #11
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Default Re: triumph cams

Not to take away from the current question in this thread, but I have an answer for the original question, in case anyone still cares:

E2478 is a race cam that pre-dates the E3134 profile. It was superceded by the E3134. I believe the E2478 is actually the exhaust cam from the set. This cam would have been used in the Grand Prix models, and very early T100 race kits.

-Shaggy
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Old 10-10-2009, 07:56 AM   #12
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Default Re: triumph cams

Well here's what I've dug up so far.

The E4678 intake is stock according to my '66 and '67 parts lists.

On Britbike i found this:
"E5045 is a 1966 exhaust cam with racing profile. Timing is the same as Daytona-type cams.
I dont think it is listed in a partsbook"

Guess I'll just use 'em and see.
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Old 11-02-2009, 07:30 PM   #13
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Default Triumph Pre unit cams or unit? in a Tr6r

Just cracked my case, found this
Intake- marked E2478 MF A1 and also E3325
Exhaust- Marked 71-0042 and also 70-9990

So what should I believe they are?
And what are they
Cheers
VT
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Old 11-02-2009, 07:33 PM   #14
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Default Re: Triumph Pre unit cams or unit? in a Tr6r

They are in a 1970 tr6r
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Old 11-02-2009, 09:22 PM   #15
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Default Re: triumph cams

Well, I have nothing to offer in terms of any answers, but I do have questions.

My cams are marked as follows: Intake (71-0040 RW) Exhaust (71-0042 maybe'3')

Does the "71" indicate the model year? also, the liost on page 1 shows both of those being intakes. Can that be right?
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Old 11-03-2009, 05:19 AM   #16
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Default Re: triumph cams

This is for anyone... Is that list complete? or is there a master list somewhere?
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Old 11-03-2009, 09:27 AM   #17
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Default Re: Triumph Pre unit cams or unit? in a Tr6r

The exhaust is correct for a 1970 650. If memory serves, the number doesn't exactly match what the parts book says, but that is the right one for the late 650 engines.

The intake is a pre-unit cam. No real difference between post-war preunit and unit intake cams, although I think by 1970 Triumph was using an E3134 intake profile, instead of the E3325 one for the intake. That intake cam is likely not nitrited, like the factory one would have been for 1970, although that just means it won't last as long.

-Shaggy

Quote:
Originally Posted by VonTodd View Post
Just cracked my case, found this
Intake- marked E2478 MF A1 and also E3325
Exhaust- Marked 71-0042 and also 70-9990

So what should I believe they are?
And what are they
Cheers
VT
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Old 11-03-2009, 09:36 AM   #18
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Default Re: triumph cams

Those are late 650 intake and exhaust cams. The intake and exhaust will differ on the units becuase the front of the exhaust cam will have the drive for the points.

The '71-' part is Triumph's translation of their part numbers when they went from letter to number prefixes. All engine parts started with E, as in E3134 for one of the cams. When Triumph went to numbers, that became a 70-3134. The problem that they ran into was the fact that they had run out of 4 digit numbers for the engine parts. So, the 5 digit part numbers went from E10040 to 71-0040 so that they all were two digit prefix and 4 digit suffix.

I have never seen a truly accurate list of all of Triumph's cams. This is in part, due to the fact that the part number on a cam was sometimes the part for the cam blank, sometimes the part number for the profile, and sometimes both. Triumph often changed the part number for the same profile, and often the numbers on the cams don't match what is in the parts book....although often they do

-Shaggy

Quote:
Originally Posted by Bayonet6d View Post
Well, I have nothing to offer in terms of any answers, but I do have questions.

My cams are marked as follows: Intake (71-0040 RW) Exhaust (71-0042 maybe'3')

Does the "71" indicate the model year? also, the liost on page 1 shows both of those being intakes. Can that be right?
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Old 11-03-2009, 04:23 PM   #19
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Default Re: triumph cams

Thanks Shaggy!
I was just wondering cuase of timing. When I cracked this egg, I found stiffer valve springs, so I was just wonder what my valve clearence needs to be for the two cams I have.

VT
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Old 11-03-2009, 04:30 PM   #20
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Default Re: triumph cams

Cam information here: http://www.postdiluvian.org/~mason/moto/cam-timing.html
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