Triumph Bonnie 2004 800cc

[Ariel Badger]

Any one worked on one of these? I am thinking of getting one and turning it into a fast sprint bike. The motor is very soft as standard but that leaves a lot of room for tuning. Tell me what is available and how many horses can I get in the stable? How strong is the bottom end, would it take a turbo or not?
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Bikers make great organ donors, get 115 on your licence today.

[Ariel Badger]

Ok, I guess this is not within the BCF knowledge base so I have asked the same on a Triumph forum. What attracts me to this project is its historical precedence, in the 60s if you wanted to go fast you used a Bonnie and I want to do that again with a Hinkley bike.
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Bikers make great organ donors, get 115 on your licence today.

[G]

Just get a GSXR1000 and some 'bonnie' stickers .. spend your time riding .

[Drake]

speak to bob farnham. big bore kit your cams and skimming and port work. dads efi is on the dyno at the moment. he has junked all the emissions stuff. oh and you hsve the hairier cams. will let you know what his is doing
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[Ariel Badger]

[MarJay]

You don't want Bob Farnham... You want Tony Scott!

https://www.t3-racing.co.uk/custom.html
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[P.]

Another vote for T3... having seen them work on some stuff in there race prepping Daytonas and Street Triples to over 140hp, I'd be well up for them playing with my bike

[YBR Ric]

https://www.triumphrat.net/twins-technical-talk/92225-1087-cc-big-bore-kit-dyno-run.html

The motors will handle the power, just depends how much you want to spend!

[G]

[Ariel Badger]

I just want a straightliner, drag strips are very enjoyable!
____________________
Bikers make great organ donors, get 115 on your licence today.

[G]

[Ariel Badger]

A great deal of the pleasure I get from riding a bike is building it and defying the manufacturer's intentions by making it run fast! This satisfies something very deep within my DNA, as a Brummie I am genetically programmed to tinker with bike engines.
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Bikers make great organ donors, get 115 on your licence today.

[moonzoomer]

[Ariel Badger]

I am looking at Triumph because one is up fo grabs if I can get a price but yes the BMW is a superb motor. A stock Beemer ran about 8.6 this weekend
____________________
Bikers make great organ donors, get 115 on your licence today.

[G]

Erm, over a quarter mile .

I know the S-RR is fast and can probably get in the 9s with some straps, but that is a tad silly-quick.

If not, what distance?

[moonzoomer]

The motor is lazy @86mm (b) x 68mm so things could be done, a flatter cam and a better overlap on the valve timing would help it rev a bit harder. The bottom end seems very well made and up to the job and old skool carbs could be fitted easily methinks. Go for it.

[Drake]

if he get a 790 he will already have the good set of cams. if he wants more its regrind time
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[Raffles]

Will you be changing your name to Bonnie Badger?
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A good loser will always be a loser.

[Nick_Giles]

.
Not sure this choice of machine is the best one even if the bottom end is beefy enough.

I may be wrong but ain't that a an engine that uses push-rods to operate the valves and not an over head cam setup.?

If so would there not be a danger of 'valve bounce' at high revs.? Resulting in at best considerable loss of power and at worst turning the whole contraption into a plate of spaghetti.


Nick
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Peter Cook: "I have learned from my mistakes, and I am sure I can repeat them exactly".

[Drake]

double over head cam. cam chain runs from crank to idler in the head then the cams run off gears. also for more midrange you advance the inlet up by one tooth
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[Drake]

also a thruxton cdi lifts the rev limiter up by 500rpm iirc
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[Drake]

also a thruxton cdi lifts the rev limiter up by 500rpm iirc
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was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box

[stevo as b4]

What kind of power are you looking for for the bike or the sprint class it would be running in etc?

It would seem that without doing anything to the bottom end that an 865cc twin with a big bore kit and all the usual tuning work on top can make about 90-95bhp at the crank or 80-85bhp at the back wheel. I bet with the right tuning and parts that a big bore motor has 100bhp potential and not become unreliable.

If i were wanting to tune a Triumph for racing though, id much rarther start with the original speed triple motor or the 1200cc 4pot. They are both heavy engines, but are also understressed and can make good power gains over std. I've heard of 1200cc Daytona engines making over 160bhp with big flat slide carbs, cams and headwork etc.

If you get the twin at the right price thats a good enough reason IMO to use one of them. I like the whole idea of use what you've got more than buying a competetive machine to start with.

I wonder as an alternative approach waht you get safely get from the Triumph twin with forced induction? i'd guess at least 110bhp? Just for my curiosity can you explain what if any effect this would have on the classification system for sprinting?

i.e would it put you into a bigger cc class having forced induction, or up against turbo'd 4cyl engines like an anything goes kind of class?

[Ariel Badger]