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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.

Winston
15-02-2005, 01:09
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.

Winston
15-02-2005, 01:17
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

Winston
17-02-2005, 20:54
8)

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

Winston
17-02-2005, 22:08
Yep, welcome to the site, you website has been a great help to me in the past :D

richy
17-02-2005, 22:29
nice one so ill be ok to have me limter raised to 7100 rpm hehe

Winston
17-02-2005, 22:38
Just what i was thinking richy

7200rpm mwwwwwhahahahahahahahahahahahahaa :twisted:

richy
17-02-2005, 22:40
its what i will be doing lol take advantage of the cams! :wink:

Winston
17-02-2005, 22:51
Its going to be a beast!!!!!! 2live catcher :wink:

richy
17-02-2005, 22:52
lol we shall see!

2 live
18-02-2005, 08:30
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

2 live
18-02-2005, 08:31
btw...............mine loves the redline at 7200 ish...quite hard to see exactly what revs its hittin the limiter at lol

J o n
18-02-2005, 14:14
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.

stan
22-02-2005, 00:51
@ 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

2 live
22-02-2005, 10:07
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

stan
22-02-2005, 11:28
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

2 live
22-02-2005, 11:54
lol^^^^^^ surely the more moving parts and forces exerted in diff areas and directions balancing is even more needed.....

stan
22-02-2005, 12:07
that seems to be the VERY popular misunderstanding....the maths prove otherwise

J o n
22-02-2005, 19:09
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