View Full Version : Revving to 7200
KingStromba
15-02-2005, 01:04
How bad for the willy engine?
GakisClio16v
15-02-2005, 01:08
It's ok!
With good re maping, you dont have any problem.
With a steel crank yes, other wise no, the crack wasn't designed to rev
but ballcrushers loved it :shock:
GakisClio16v
15-02-2005, 01:12
Afriend of mine has rev limit 8200 now and we are going dor 9500rpm!
With 8200rpm rev limit, one year now, we dont have any problem.
8200 On a 2.0L willy engine :shock:
Must be modded to run that crazy rpm?, Maxi rally cars used to run 8500 and they had uprated everything.
KingStromba
15-02-2005, 01:29
Whats the limit on a standard crank then?
GakisClio16v
15-02-2005, 01:32
Of course we hace balanced the crank before at 10.000 rpm.
I think for a std crank, 7500 is fine...
KingStromba
15-02-2005, 01:32
My crank has been balanced.
cliokongen
17-02-2005, 20:24
Problem is not the crank...
Crank is fine.
Problem will be piston speed and the mass you are trying to move.
Piston speed of F7P @ 8200 = 22,7 m/s
Piston speed af F7R @ 7500 = 23,3 m/s
Piston speed of F7R @ 8500 = 25,4 m/s
Which is quite a lot whith the amount of mass being thrown around.
Hope my calculations are right. Did them a long time ago when bored! :shock:
Michael
KingStromba
17-02-2005, 20:38
So what is it at 7200 on an F7R?
Is 25.4 m/s too fast?
cliokongen
17-02-2005, 20:49
@ 7200 rpm = 22,6 m/s
This would not be a problem at all....
Personally i feel above 7500 for the F7R is a bit on the high side... but...
My opinion: 7500 rpm is the limit for the F7R in std. trim.
I think you would need to balance it very precisely when reving higher and having all the other advantages of doing the lightening and balancing at the same time.
F7R/F7P is a strong construction but internal parts are heavy compared to more modern engines. (especially japanese)
Michael
KingStromba
17-02-2005, 21:34
8)
Sounds like you know your stuff, stick around
cliokongen
17-02-2005, 21:51
Thx... I will... I have no mechanical training at all - this is pure interest and my own experiences - so might be very wrong on some topics :-)here to learn more about our great little hatches...
Michael (www.renaultklubben.dk)
KingStromba
17-02-2005, 22:02
Welcome to the club Michael
Yep, welcome to the site, you website has been a great help to me in the past :D
nice one so ill be ok to have me limter raised to 7100 rpm hehe
Just what i was thinking richy
7200rpm mwwwwwhahahahahahahahahahahahahaa :twisted:
its what i will be doing lol take advantage of the cams! :wink:
Its going to be a beast!!!!!! 2live catcher :wink:
lol.theres a few im gunna have to keep me eye on this year i think..............
looks like the cheque book mite be comin out again later this year hehe
btw...............mine loves the redline at 7200 ish...quite hard to see exactly what revs its hittin the limiter at lol
sounds like you guys need cutom Willy dials that are exactly the same but for the redline blocks starting at 7'500 and ending at 8k just for a bit of scope... when I get cams I'll prolly be going for 7500rpm to be honest.
@ 7200 rpm = 22,6 m/s
This would not be a problem at all....
Personally i feel above 7500 for the F7R is a bit on the high side... but...
My opinion: 7500 rpm is the limit for the F7R in std. trim.
I think you would need to balance it very precisely when reving higher and having all the other advantages of doing the lightening and balancing at the same time.
F7R/F7P is a strong construction but internal parts are heavy compared to more modern engines. (especially japanese)
Michael
the crank has been known to fail on a few occasions
lightening the crank poses no advantage UNLESS you have lighter pistons/con-rods
but any place worth its salts would only lighten/balance the crank as part of the full package of crank rods flywheel....then its up to u or ur engine guru to decide on pistons
maybe, but people tend to lighten the crank WITHOUT fitting lighter pistons. you will put the system out of balance if you lighten the crank without fitting lighter pistons/rods
balancing on an engine with more than 2 cylinders is pointless anyway
lol^^^^^^ surely the more moving parts and forces exerted in diff areas and directions balancing is even more needed.....
that seems to be the VERY popular misunderstanding....the maths prove otherwise
that seems to be the VERY popular misunderstanding....the maths prove otherwise
fair enough, i see your point, but maths doesn't always win when it comes to cars, I think on road results are more accurate. i'd 1/4 mile it before and after everything has been lightened and balanced then see.
KingStromba
22-02-2005, 19:59
1/4 miling would be too unscientific. There are too many variables. Drive a car down the strip get a 15.0. Lighten and balance it and get a 14.4.
But was it the lightening and balancing or:
Track temp
Tyre pressures
Air temp
Start
Wind speed
Track condition
Driver skill (maybe you were more switched on this time)
Oil level
Fuel level
Oil type
etc etc etc
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