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Post by Deleted on Jan 22, 2005 22:49:01 GMT
Has anyone ever tested their P5B on a dynamometer? I'm about to do this, and was wondering what sort of BHP I should expect.
I seem to recall the original specs were around 184bhp(?).
I'm not technical, so please forgive my ignorance, but would that be measured at the wheels (like the dynamometer measures) or power out of the engine?
cheers
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Post by stantondavies on Jan 24, 2005 8:18:16 GMT
The quoted BHP will have been measured at the flywheel. Expect a lot less at the wheels.
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Post by Deleted on Jan 24, 2005 8:58:55 GMT
Cheers for that. Any idea how much less?
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Post by stantondavies on Jan 24, 2005 9:06:40 GMT
It is many years since I took an interest in such matters so the memory is a little hazy; perhaps half? I will look around to see if I can find more information for you.
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Post by Adrian50 on Jan 24, 2005 13:42:01 GMT
A Dynomometer is used to test engines (out of the car). Early Rover figured were 184 SAE later figures were 165 DIN (I think). Just wondered, if you are putting your engine on a Dyno, is it a standard or modified engine? Or are you putting the car on to a rolling road? I would expect a loss through the gearbox and axle of 50 bhp. Cheers
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Post by Deleted on Jan 25, 2005 7:39:07 GMT
It's a standard engine now, but one of the reasons I'm testing is that I'm thinking of putting on an Edelbrock Rover Performer manifold and carb. So, interested to see if you get the improvements they say you do if I go down that route.
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Post by adrian50 on Jan 25, 2005 8:50:00 GMT
That sounds to be very sensible and very interesting. I too would be interested to see what gains can be obtained. Good luck and do lets know the results. Adrian
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Post by Deleted on Jan 26, 2005 8:03:32 GMT
Will do.
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Post by will hamlyn on Jan 29, 2005 22:00:44 GMT
I seem to remember reading an old road tset of a p6 a few years back and they had 112 at the wheels I think, so that should t
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Post by will hamlyn on Jan 29, 2005 22:04:05 GMT
I seem to remember reading an old road tset of a p6 a few years back and they had 112 at the wheels I think, so that would tie up with the 50 bhp loss through the drivetrain, maybe a bit more for the older box?
out of interest roughly how much is rolling road time? is it charged by the hour?
Will
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Post by Deleted on Jan 31, 2005 18:15:14 GMT
Apparently the whole exercise takes one hour, mostly on set up, with the actual engine test taking 30 seconds. The attach something to your wheels, don't know whether this is what people mean when they say "rolling road".
I'm in New Zealand, but the cost is 75 NZ dollars - roughly 25 pounds.
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Post by Roy F on Feb 22, 2005 13:24:44 GMT
The other thing to remember of course is that the factory bhp was quoted on 5 star fuel, there will be a loss for lower octane fuel. Also I read in a tuning book that the cooler the air at intake the more power it gives. Some rolling road operators cheat on the quoted air temperature into the computer which calculates the bhp from the engine. I've never had it done but you should make sure the temp readings quoted are the same to get a true before and after reflection.
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Post by Smallfry on Mar 4, 2005 21:59:54 GMT
Cost is normally about £60 ish per hour
At the wheels figures are round about 2/3 of the flywheel figure. And remember the old SAE tests had no PS pump or dynamo/alternator being driven, and were fresh out of the box !
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