Triumphrat

ow595 · 03-21-2007

Hi All,
Its been a while since owning my 01 Bonnie but I have been thinking of a Thruxton nwxt. I see some people are building up some great bikes and motors.
I love to follow all the bigbore, cam, flowed head, carb discussions but I haven't seen anyone talk of lightening the flywheel?
As I have done with all my previous Guzzis and Ducatis machining down a lighter flywheel nets great results (quicker RPM's and shifting, some times lighter handling).
The flywheel on the bonnies seems to be huge and looks like it could loose a few pounds without negitive results. I pulled this pic off another post but look at this beast. Anyone else give it a shot?

Thanks,

William
Santa Cruz, Ca

Fast_Fashion · 03-22-2007

i wish someone made an aftermarket aluminum or chromoly flywheel.

The results with my cars have been amazing.

[ This message was edited by: Fast_Fashion on 2007-03-22 00:16 ]

setts · 03-22-2007

I'm with you ow. Generally, most of the "normal mods" seem to be torque mods. Increased torque X available RPM = more power. Nothing wrong with that. But increased torque X increased RPM = much more power. So increasing RPM and torque is a more complete solution. In this we're kinda limited by the non-programmable ignition module limiting us to around 8,000 RPM. Okay I know you can get a couple more RPM from Procom but that's not the answer to real power. You need a 3 D programmable unit so you can map the ignition timing. Hey, after all we're in the digital era.

I've never looked at the bottom end but from all accounts it seems that it's pretty robust, so there must be more RPM in the lump. Jojje seems to coax a serious amount of power from the motor with his turbo mods - far more than you could ever get with normal carburettor aspiration. Lightening and polishing the crank and rods is a routine power mod and will allow for increased RPM and power (provided a someone finds a cost effective answer to the igniter). We need another say 2,000 RPM. But can the stock rods and crank handle another 2,000 RPM??? My gut feel is that they can but I'm totally unqualified in this area.

BTW Gill Instruments who supply the Triumph kit do have a fully programmable igniter module available at around GBP 500! It comes with everything, is 3 D programmable and includes windows based software to map the ignition. I'm sure it will do the job, but it seems expensive and requires fitting a new timing disk and sensor as well as sorting out the TPS thing. I wish I had the experience and time to solve these challenges. Please some one help us all.

[ This message was edited by: setts on 2007-03-22 01:53 ]

sweatmachine · 03-22-2007

I think the issue is cost, with a 904 and head work the bottom end is left alone, saving a lot of labor time over the complete engine teardown/rebuild.

ow595 · 03-23-2007

Just from the picture, it looks like 2 to 3 lbs could be machined off with little effort and cost.
I have an alloy replacement for my Ducati 992cc motor, which goes from 7lbs to 12 ozs. A bit extreem but effective.

William