Had my mini on the R@R a few months back which I found rather disappointing, but more importantly it's showing a loss of 25bhp from the flywheel to the wheels, am I right in thinking this is a bit excessive also considering I'm running a SC box and drops, the engine had just had a complete rebuild @ Paul inch.
The actual R&R figures were 93.2bhp @ flywheel & 67.4bhp @ wheels considering this is a very high spec 1430 engine I'm quite disappointed in both figures.
I am running a SW5 cam which I think may be to blame for the overall low bhp but the loss in power to the wheels is a bit confusing, any ideas!
Large Loss Of Power From Flywheel To Wheels?
Started by
wait1380
, Dec 01 2012 05:32 PM
10 replies to this topic
#2
ACDodd
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Up Into Fourth
Posted 01 December 2012 - 05:42 PM
Spot on power for sw5 cammed engine. What wheels are you running?
AC
AC
Edited by ACDodd, 01 December 2012 - 05:42 PM.
#3
jaydee
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Crazy About Mini's
Posted 01 December 2012 - 06:30 PM
And tyres pressure too.
#4
wait1380
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Learner Driver
Posted 01 December 2012 - 06:32 PM
On the rollers I just had a set of old rostyles
#5
wait1380
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Learner Driver
Posted 01 December 2012 - 06:33 PM
Is there any way of getting more power from the SW5 of is it going to be a cam change
#6
jaydee
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Crazy About Mini's
Posted 01 December 2012 - 06:37 PM
Eh with 1.5 rollers you should move power range further up, but you'll gain 2/3 bhp only...
#7
wait1380
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Learner Driver
Posted 01 December 2012 - 06:48 PM
Already running swiftune 1.5 rockers ultra light flywheel stroked crank well worked head etc etc.
#8
wait1380
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Learner Driver
Posted 01 December 2012 - 06:49 PM
How much do you think I would gain by changing to a 286 cam?
#9
ACDodd
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Up Into Fourth
Posted 01 December 2012 - 08:46 PM
That should poke out 115bhp with a 286 and 1.5 rockers, if in 1st class condition, the emissions will be much higher and the low end pull will be a lot less than what you have now.
Interesting comments on this forum about 1.5 rockers, on this engine the sw5 would loose around 10-12hp by going back to stock 1.22 rockers. Again the 286 would only push about 95 to 98hp with stock rockers and 110 to 115bhp with them fitted.
AC
Interesting comments on this forum about 1.5 rockers, on this engine the sw5 would loose around 10-12hp by going back to stock 1.22 rockers. Again the 286 would only push about 95 to 98hp with stock rockers and 110 to 115bhp with them fitted.
AC
Edited by ACDodd, 01 December 2012 - 10:25 PM.
#10
jaydee
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Crazy About Mini's
Posted 01 December 2012 - 09:12 PM
How do you set the geometry to achieve such a big difference?
#11
ACDodd
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Up Into Fourth
Posted 01 December 2012 - 10:31 PM
The geometry is important if you want the most from these. However the geometry is only worth a couple of 3 horses. The difference most people quote is because they fail to baseline the engine an do a true measurement. It is true however the real benefits are mostly after 4.5krpm.
In my testing, 1.3 rockers will give the best average torque from 2 to 5krpm on a typical road cam.
AC
In my testing, 1.3 rockers will give the best average torque from 2 to 5krpm on a typical road cam.
AC
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