[trirocket3]

Some of you may know I like to mess with my bikes a bit,
so after playing around with it I wanted to know where the bike is at before I get my reground cams fitted.
Result dyno man told me is 92.8rwhp & 84ftlb, this was only a power run as in 2weeks it comes apart again.
Stock I believe is 76hp & 78ftlb at the crankshaft, so gained a bit
When I get my new cams in I reckon 105bhp is a reasonable target, not bad for a blobber.
Oh & speed restriction is obvious on the dyno.

 

[tedman]

So, may I ask what are the mods you have undertaken so far to go from stock to where you are now before cams? Which tuner are you using? Love to see a chart of the AFR and if the CF is in SAE. You are definitely one of the pioneers! Good luck.

 

[tedman]

BTW, those are huge gains so far, if you went from 76 bhp to almost 93 rwhp! Using a rule of thumb that losses from bhp to rwhp equal about 12-13%, you are already at 93 rwhp. target of 105 bhp seems conservative, given reground cams? Am I missing something?

 

[trirocket3]

Some air box work,my own decat & exit pipes to allow universal (Cheap) silencers I use goldies.
Head off, I flowed ports & Pretech gave it a quick skim, & PCV.
No tuner just me winging it as usual, here is pic of the head being done on a very professional cardboard box work bench, on the floor of my garage.

 

[AirCooled]

Any guess on gains stock with decat exhaust and PCV tune?

 

[trirocket3]

Any guess on gains stock with decat exhaust and PCV tune?

If you are only doing decat I would not bother with PCV gains would be minimal & not cost effective.

 

[tedman]

Great, thanks. Following your progress.

 

[motosickle]

Like that! Thumbs up! But I think you got a lot of money to burn as you break a almost new bike.

What about using a thruxton camshaft with ported heads, bigger ventiles and a new map?

The difference in the power output between T120s and the Bobber ist that the bobber has a smaller airbox because of its swingarmconfig. I am not a friend of pods an no airbox as it is not useable in rain and bad weather and the output-range and tolerace to different weather- and airpressureconditions ist getting smaller due the setup.
Using a cleaned up airbox or building a new one, makes it more of a daily driver in all conditions. Looking at the original-Triumph airbox makes me wonder if a big big hose between the left and right side + holes left and right would at least double up the airvolume. This would bring a big improvement. +all the other mods...

Dan

 

[trirocket3]

Like that! Thumbs up! But I think you got a lot of money to burn as you break a almost new bike. What about using a thruxton camshaft with ported heads, bigger ventiles and a new map?
The difference in the power output between T120s and the Bobber ist that the bobber has a smaller airbox because of its swingarmconfig. I am not a friend of pods an no airbox as it is not useable in rain and bad weather and the output-range and tolerace to different weather- and airpressureconditions ist getting smaller due the setup.
Using a cleaned up airbox or building a new one, makes it more of a daily driver in all conditions. Looking at the original-Triumph airbox makes me wonder if a big big hose between the left and right side + holes left and right would at least double up the airvolume. This would bring a big improvement. +all the other mods...Dan

Dan Cams are the same, I have flowed the head, other maps not available I use pcv, I do have some ideas but will try them out on my bike before posting.
I have modded airbox/filters so it is getting enough air.

 

[trirocket3]

I went out on the blobber today & gave it some beans, it accelerates at least as quickly as my TTR, hardly needs the new cams but boys will be boys,
so they are going in end of this week, then that's it power wise, it can surprise a lot of people, looking so old then showing them its heels.

 

[trirocket3]

Latest run with new cam, 107rwhp & ninety+ (pic is fuzzy) ftlb
Before & after cam

Power & torque

Power & fuel

 

[muensterDeath]

Impressive! How is the drive ability with the new cam?

 

[tedman]

sheesh! that afr chart is really nice. the only thing I wonder about is the chart is uncorrected and smothing is 4. would be much more assuring if CF is SAE and smoothing set to 5. also, was the run done in 5th or 6th gear. thanks

 

[NicoR]

Hi Trirocket3,

You stated that you have modded airbox/filters so it is getting enough air. Please can you describe what dit you do with the airbox to achieve a better flow?

Thanks!

 

[Guffer]

Hi Trirocket,

You should get in touch with a motorcycle magazine (not sure which one however as I don’t know your location in the world) and let them know the work you’ve done to your Bobber and the results you’re getting. It would make for a very interesting article particularly if they did comparison performance tests (acceleration, etc.) between yours and a stock Bobber. I know I’d read it.

Just a thought.

 

[trirocket3]

Uncorrected is what the bike actually did, before being compensated for temp etc, usually my dyno's are Din but those are just numbers, important thing is the A/F which is nice
and with over 100 rwhp & 90+ftlb it is noticeably quicker than my Thrux R, so I am happy with that.
Air filters have a metal mesh covering them it is very restrictive I removed it & cut more openings in the air box to allow more air in, not pretty but effective.
Magazines, I have had my R111 featured in a mag, & still get calls from them regarding some of my other bikes which is nice,
I have won best in show & left before being given the plaque, I modify my bikes for me, so can't really be bothered with all that fuss.
With approaching a 50% increase in rwhp comparison tests would hardly be needed, my blobber now is looking good & going quick, that will do for me.

 

[Guffer]

Fair enough.

Any chance you could post a video of your tuned Bobber in action though? I’d love to see it!

 

[trirocket3]

OK I did say that will do for me, but I have been working on my TTR head & have had another cam reprofiled with a little more lift & duration than the one I put in my blobber.
So as I prefer riding the blob it makes sense in my twisted mind to bung the latest cam into the bike I ride most, so the 'R' got mugged & the new cam is now in my coolest ride.
Have not put it on dyno again yet but will do just to get A/F's sweet again, there will only be some small gains as I did not want to make the cam too aggressive
causing the lower rpm to suffer, I reckon around 95ftlb & 112rwhp, that will do, for now.

 

[trirocket3]

Did another dyno run today 111hp
doing a bit more in the next couple of weeks should be 120hp+

 

[Ethariel]

It's reading threads like this that make me wish I had continued with engineering rather than moving into electronics in years gone by!