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SV650.org - SV650 & Gladius 650 Forum (http://forums.sv650.org/index.php)
-   SV Talk, Tuning & Tweaking (http://forums.sv650.org/forumdisplay.php?f=111)
-   -   quick engine braking question (http://forums.sv650.org/showthread.php?t=132696)

noob-saibot 27-05-09 04:07 PM
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

yorkie_chris 27-05-09 04:10 PM
Re: quick engine braking question
 
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
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.

noob-saibot 27-05-09 04:15 PM
Re: quick engine braking question
 
Quote:
Originally Posted by yorkie_chris (Post 1922529)
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 :confused:

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

yorkie_chris 27-05-09 04:18 PM
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...

ophic 27-05-09 04:25 PM
Re: quick engine braking question
 
Quote:
Originally Posted by yorkie_chris (Post 1922539)
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
Re: quick engine braking question
 
See how much throttle position affects the engine braking with no ignition.

ophic 27-05-09 04:32 PM
Re: quick engine braking question
 
Quote:
Originally Posted by yorkie_chris (Post 1922547)
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?

noob-saibot 27-05-09 04:34 PM
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 ;)

ophic 27-05-09 04:36 PM
Re: quick engine braking question
 
Quote:
Originally Posted by noob-saibot (Post 1922557)
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.


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