quick engine braking question - SV650.org

27-05-09, 04:07 PM

Would i be right in thinking that a full power sv has more engine braking than a restricted sv in the higher rev range, given that you actually have power above 7/8,000rpm?
eg. If you were to wind off on both bikes from say 11/12,000rpm would the full powered sv slow down quicker than the restricted, unasisted by brakes?

Just popped into my head is all

yorkie_chris · 27-05-09, 04:10 PM

Nope, just the same. The restricted airflow into the engine makes no odds when the throttle valves are closed.

Mr Speirs · 27-05-09, 04:11 PM

I am not sure actually. I would think it would have an effect but I don't think it would be proportionate to the BHP. It would be proportionate to the tourque which is relatively untouched by the restriction I believe. Just thinking out load here, could be totally wrong.

And sure someone with knowledge will answer it correctly.

27-05-09, 04:15 PM

Quote:

Originally Posted by yorkie_chris

Nope, just the same. The restricted airflow into the engine makes no odds when the throttle valves are closed.

Exactly the same? Really...wow, in my head i would have thought there would be some difference

I really should do some reading on torque and bhp and whatnot..

yorkie_chris · 27-05-09, 04:18 PM

Needs no background, what's the difference between a full power and a 33bhp bike at tickover? That's effectively the carb conditions you're giving it.

But, I suspect that engine braking is more due to the air underneath the pistons than that in the cylinders. I will try it when the roads are quiet...

ophic · 27-05-09, 04:25 PM

Quote:

Originally Posted by yorkie_chris

But, I suspect that engine braking is more due to the air underneath the pistons than that in the cylinders. I will try it when the roads are quiet...

What are you going to try?

yorkie_chris · 27-05-09, 04:26 PM

See how much throttle position affects the engine braking with no ignition.

ophic · 27-05-09, 04:32 PM

Quote:

Originally Posted by yorkie_chris

See how much throttle position affects the engine braking with no ignition.

Just find a big hill and turn off the ignition? then waggle the throttle?

27-05-09, 04:34 PM

Guess i'll have to take your word for it. I really havent a clue about torque and bhp and how they realate to each other...time to hit the books so

ophic · 27-05-09, 04:36 PM

Quote:

Originally Posted by noob-saibot

Guess i'll have to take your word for it. I really havent a clue about torque and bhp and how they realate to each other...time to hit the books so

be careful what you believe. There's so much cobblers about. In fact the 2 most mythical subjects are "torque vs power" and "what causes engine braking". People just make up stuff to explain it.

27-05-09, 04:07 PM	#1
noob-saibot Guest Posts: n/a	quick engine braking question Would i be right in thinking that a full power sv has more engine braking than a restricted sv in the higher rev range, given that you actually have power above 7/8,000rpm? eg. If you were to wind off on both bikes from say 11/12,000rpm would the full powered sv slow down quicker than the restricted, unasisted by brakes? Just popped into my head is all

27-05-09, 04:10 PM	#2
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: quick engine braking question Nope, just the same. The restricted airflow into the engine makes no odds when the throttle valves are closed. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

27-05-09, 04:11 PM	#3
Mr Speirs Member Mega Poster Join Date: Jul 2008 Location: Northampton Posts: 2,218	Re: quick engine braking question I am not sure actually. I would think it would have an effect but I don't think it would be proportionate to the BHP. It would be proportionate to the tourque which is relatively untouched by the restriction I believe. Just thinking out load here, could be totally wrong. And sure someone with knowledge will answer it correctly. __________________ Smokey Black Burnty 02 - Racetech Smoulderlators + .90kg BBQ Springs, zx10r shockingly toasted, Conti Road Attacks heat up very nicely, R&G Crash Bungs but what f**king use are they, No Colour Matched Hugger, Flame Extenda, Beowulf Titainium Oval Flame Thrower.

27-05-09, 04:18 PM	#5
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: quick engine braking question Needs no background, what's the difference between a full power and a 33bhp bike at tickover? That's effectively the carb conditions you're giving it. But, I suspect that engine braking is more due to the air underneath the pistons than that in the cylinders. I will try it when the roads are quiet... __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

27-05-09, 04:26 PM	#7
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: quick engine braking question See how much throttle position affects the engine braking with no ignition. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

27-05-09, 04:34 PM	#9
noob-saibot Guest Posts: n/a	Re: quick engine braking question Guess i'll have to take your word for it. I really havent a clue about torque and bhp and how they realate to each other...time to hit the books so

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