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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-18-2012, 02:54 PM   #1 (permalink)
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Safe rev limit?

Here's a question for the tuners... at what redline will be bike blow up?

As the sig says, I have:
* early '01 790 cams
* shim under bucket conversion
* double vlave springs
* +1.5mm oversize valves
also the following might play a part:
* inlet and exhaust ports have been smoothed and polished
* Wiseco 904

I raised the Procom's rev limiter to 9,000 and everything's been fine for a couple of years. (Yes, I regularly hit the redline.)

This year I made some 48mm headers (internal diameter is 45mm) - and now the bike still pulls quite well at 9k.

I'm quite tempted to raise the redline 100rpm at a time and stop when I feel a dropoff in power... but...

When can I expect everything to let go? 9,050 rpm or 10,000 rpm?
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Old 11-18-2012, 03:44 PM   #2 (permalink)
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With stock rods your pushing it at 9000
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Old 11-18-2012, 03:49 PM   #3 (permalink)
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*sigh*

Looks like the credit card is about to take another beating.

Thanks once again for your advice, mikeinva....
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Old 11-18-2012, 10:59 PM   #4 (permalink)
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Old 11-19-2012, 01:48 AM   #5 (permalink)
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Yeah. Right.

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Old 11-19-2012, 04:16 AM   #6 (permalink)
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Quote:
Originally Posted by H3CT1C View Post
Here's a question for the tuners... at what redline will be bike blow up?

As the sig says, I have:
* early '01 790 cams
* shim under bucket conversion
* double vlave springs
* +1.5mm oversize valves
also the following might play a part:
* inlet and exhaust ports have been smoothed and polished
* Wiseco 904

I raised the Procom's rev limiter to 9,000 and everything's been fine for a couple of years. (Yes, I regularly hit the redline.)

This year I made some 48mm headers (internal diameter is 45mm) - and now the bike still pulls quite well at 9k.

I'm quite tempted to raise the redline 100rpm at a time and stop when I feel a dropoff in power... but...

When can I expect everything to let go? 9,050 rpm or 10,000 rpm?
Have your bike dyno'ed, this will indicate where the maximum power is, Standard bikes 7200rpm (I think), there is not much point revving higher than max power, because you can change up a gear, and have the power and torque pull you along to faster speeds. If your bike pulls past maximum power in top gear, adjust your sprockets to make up for it.
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Old 11-19-2012, 11:57 AM   #7 (permalink)
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Yep. Thanks Phil-1100. I'm trying to get some last minute adjustments done before the cold closes in on Finland, and I should finally be able to afford some dyno time this winter since I've only got some (relatively) cheap cosmetic changes planned for winter work...
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Old 11-19-2012, 12:22 PM   #8 (permalink)
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I've also wondered about this; as my '08 red lines on the tach at 7000, but the new model T100's redline at 8000, and the new Thruxtons at 8500.

Rick
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Old 11-19-2012, 12:58 PM   #9 (permalink)
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Quote:
Originally Posted by RickMcCl View Post
I've also wondered about this; as my '08 red lines on the tach at 7000, but the new model T100's redline at 8000, and the new Thruxtons at 8500.

Rick
they all should hold together to around 8500 for short burst.Above that things like stock valve springs and conecting rods can let go.But like phil said its no need to rev it passed where the hp is.Stock motors run out of hp way before 8500.Some a good ways below 8000.
To set one up to go 9000+ you better have everything right even the crank needs work.
with streetable cams you wont gain any thing in the 9000+ range anyway.
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Old 11-19-2012, 08:15 PM   #10 (permalink)
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The limiter on my 865/270 with 813 cams is conservatively set at 8250. If I had to do it over again it would be 8500.
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