AR-CoolC
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| posted on 11/8/08 at 08:33 PM |
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V-Twin BEC?
Has anyone built a BEC using a big V twin? something like the Ducati (probably the best sounding bike out there)
They are renown for having more bottom end torque than the high revving 4 pots, so though it would suit a car more. Is that right or am I just being
dumb?
Imagine what it would be like if there were no hypothetical situations.
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r1_pete
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| posted on 11/8/08 at 08:51 PM |
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Ducati's are very high maintenance, belts at 6K, clutch baskets wear and rattle like a can of marbles, probably not the best choice for a BEC.
If you want torque, Triumph Rocket 3, 2.3L three cyl, shaft drive, when my MG is done I'm seriously thinking about it.
[Edited on 11/8/08 by r1_pete]
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Richard Quinn
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| posted on 11/8/08 at 08:55 PM |
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I'm currently building an STM locoblade using an Aprilia V990 out of an RSV Mille. It's bit of a tight squeeze so I don't know if
you'd get a 90deg twin in.
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StevieB
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| posted on 11/8/08 at 09:00 PM |
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Similarly a TL1000 engine would probably also suit (and probably last longer being a Jap engine and all that)
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stevebubs
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| posted on 11/8/08 at 09:02 PM |
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BenB has one....
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graememk
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| posted on 11/8/08 at 09:22 PM |
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what about a pan euro engine ?
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simoto
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| posted on 11/8/08 at 09:36 PM |
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A vfr800i v4 is the way forward, incredibly small and impossibly trick with fuel injection, gear driven cams and a beaut flat line of torque all the
way through.
Truly hair tingling noise when allowed to breathe too. Remember hizzy and joey over the mountain. Awesome, do it!
striker/blade now complete, thanks to all on this site.
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BenB
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| posted on 11/8/08 at 09:42 PM |
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I've got a V4 (ST1100). STM did a V-twin BEC before they first mooted the ST1100 installation. Can't remember the engine used but it
seemed to keep up reasonably in the RGB race series. Wasn't at the front though....
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simoto
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| posted on 11/8/08 at 09:50 PM |
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Cool! Bet that sounds lovely on full chat. Short shift city dude, im jelous
striker/blade now complete, thanks to all on this site.
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robertwa
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| posted on 11/8/08 at 11:30 PM |
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Something like this:
Taken from this website:
http://www.kineticvehicles.com/whippet.html
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Paul TigerB6
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| posted on 11/8/08 at 11:33 PM |
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quote:
Originally posted by BenB
I've got a V4 (ST1100). STM did a V-twin BEC before they first mooted the ST1100 installation. Can't remember the engine used but it
seemed to keep up reasonably in the RGB race series. Wasn't at the front though....
The Honda SP1 was the one they used from memory.
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Ivan
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| posted on 12/8/08 at 05:51 AM |
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The reason BEC cars are so quick is to do with work rate - ie horse power and high revs - and not torque. The same applies to F1 cars.
So a high torque low (relatively) reving BEC is in many ways counter productive - you might as well go CEC.
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procomp
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| posted on 12/8/08 at 07:30 AM |
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HI As Ivan ^^ says above. And was proved by the STM V twin in the RGB championship. The car was just too slow with no real GO in it. where as the
same car with a conventional bec setup was a race winner.
Cheers Matt
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BenB
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| posted on 12/8/08 at 07:53 AM |
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Well it works for me
100Bhp at the wheels in a car weighing 540kg (with me in it) and a nice flat power band and a 8.5k red line works very nicely.....
It's got usable power low-down for pootling round the North Circular but plenty of gusto for when the road opens up....
To be honest I'd like another 1k on the red-line (apparantly very do-able: STM ran their ST1100 with a "tuned" ECU which was in
fact just an ECU of a Honda bike with a higher redline).... Once I've finalised the Emerald installation I'll be seeing just how high a ST
can rev without blowing.... though I'll probably bottle it before reaching 10k!!
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BenB
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| posted on 12/8/08 at 08:38 AM |
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quote:
Originally posted by procomp
HI As Ivan ^^ says above. And was proved by the STM V twin in the RGB championship. The car was just too slow with no real GO in it. where as the
same car with a conventional bec setup was a race winner.
Cheers Matt
Without wanting to dis the driver was it definately the car? It would have been interesting to see what happened if a driver from the front of the
field drove the V-twin. Wasn't the driver a rookie? If I drove a ZZR1400 car I'd make it look slow  The main thing I didn't like
about it was the noise it made
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simoto
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| posted on 12/8/08 at 10:03 AM |
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You would have big drive advantage coming off corners too. Also would be difficult for a novice to take full advantage of.
Gear driven valvetrain, 8500 rpm cec?
Yeah right. The vfr800i i mooted will rev a lot higher too. Huge reliability as standard too!
I bet the other big three jap manufacturers couldnt make the engine today, never mind 20 yrs ago.
striker/blade now complete, thanks to all on this site.
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Jason Fletcher
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| posted on 12/8/08 at 02:16 PM |
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not convinced about a V twin but the new Honda 1000cc V5 might be very very cool
Jason
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procomp
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| posted on 12/8/08 at 02:22 PM |
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Hi
quote:
Without wanting to dis the driver was it definately the car? It would have been interesting to see what happened if a driver from the front of the
field drove the V-twin. Wasn't the driver a rookie? If I drove a ZZR1400 car I'd make it look slow The main thing I didn't like
about it was the noise it made
All the original testing was done by Martin Tim and Ian.
Cheers Matt
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paul the 6th
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| posted on 12/8/08 at 07:24 PM |
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i've got a suzuki sv650 sport - 650cc v-twin - I'm never going back to IL4 (with bikes anyway)
But I've often wondered about using a v-twin but was never sure how difficult/useable it would be
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froggy
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| posted on 13/8/08 at 07:06 PM |
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i run a tl1000 powered car but its mid mounted and chain driven ,mine is 460kg and the performance is around the same as an early blade engined bec.
lack of revs is the problem and lack of outright power to pull sensible road gearing but i use a shot of nitrous to bring the power up to 180 from the
stock tl,s 120ish hp. oil starvation could be an issue if it was prop driven but ive caned mine to death for two years and have had no issues other
then wearing chains out every six months or so. they are cheap though i have a few spare engines and a package with loom ecu etc is usually around the
£500 mark
[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]
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