Crankshaft Question
#1
Regular Contributor
Thread Starter
Join Date: Oct 2009
Location: aberdeen
Posts: 255
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
Hi folks, in need of some advice if possible.
Having had no.4 shell spin on a Cossie engine I sent it off to be checked and rebuilt. They found the crank to still be on standard grind but now has a 17thou bend from the shell going.
I then sourced a second hand crank on a 0.5 grind that I was informed was ready to go however once the engine builder measured it it appears no.4 on that one too is fooked and would need a grind to 0.75, but this crank is straight and always has been.
Has anyone had a crank straightened and how has the car been with it?
My options now are:
1) Straighten the 0.25 grind the std original crank
2) 0.75 grind the 2nd hand one
3) Chuck a gallon of V Power and a match at the car and torch the fecking thing!!
Cheers in advance for any advice/opinions
Having had no.4 shell spin on a Cossie engine I sent it off to be checked and rebuilt. They found the crank to still be on standard grind but now has a 17thou bend from the shell going.
I then sourced a second hand crank on a 0.5 grind that I was informed was ready to go however once the engine builder measured it it appears no.4 on that one too is fooked and would need a grind to 0.75, but this crank is straight and always has been.
Has anyone had a crank straightened and how has the car been with it?
My options now are:
1) Straighten the 0.25 grind the std original crank
2) 0.75 grind the 2nd hand one
3) Chuck a gallon of V Power and a match at the car and torch the fecking thing!!
Cheers in advance for any advice/opinions
#7
Regular Contributor
Thread Starter
Join Date: Oct 2009
Location: aberdeen
Posts: 255
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
They run the gauge round the journals and each one from 1-4 is showing a greater reading than the last so it does have a bend, as said its about 19thou
Trending Topics
#8
![Default](https://passionford.com/forum/images/icons/icon1.gif)
Wow.
It must take some effort to do that, and even more for them to be able to straighten it.
Ive seen Subaru cranks bend, although their webbing between the journals is pretty thin. Although even that is rare
It must take some effort to do that, and even more for them to be able to straighten it.
Ive seen Subaru cranks bend, although their webbing between the journals is pretty thin. Although even that is rare
#9
Regular Contributor
Thread Starter
Join Date: Oct 2009
Location: aberdeen
Posts: 255
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
I've been told its when the shell spins it locks and the crank bends/twists as it frees off
Shit happens I guess
#10
Wahay!! I've lost my Virginity!!
Join Date: May 2011
Location: Wellington NZ
Posts: 93
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
My brother built his VR-4 motor (4g63t) evo etc round a crank that the engine recon shop straightened for him. running approx 320 hp at the wheels does 12.5 quarter miles and when the front axels are out enters most of the local burnout comps. So far engine has performed faultlessly, have they straightened any in the past?
(search you tube VR4 rwd Levin or Masterton, if you wana see an old VR do so sum burnouts its the yellow one, from NZ lol)
(search you tube VR4 rwd Levin or Masterton, if you wana see an old VR do so sum burnouts its the yellow one, from NZ lol)
#12
Regular Contributor
Thread Starter
Join Date: Oct 2009
Location: aberdeen
Posts: 255
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://passionford.com/forum/images/icons/icon1.gif)
My brother built his VR-4 motor (4g63t) evo etc round a crank that the engine recon shop straightened for him. running approx 320 hp at the wheels does 12.5 quarter miles and when the front axels are out enters most of the local burnout comps. So far engine has performed faultlessly, have they straightened any in the past?
(search you tube VR4 rwd Levin or Masterton, if you wana see an old VR do so sum burnouts its the yellow one, from NZ lol)
(search you tube VR4 rwd Levin or Masterton, if you wana see an old VR do so sum burnouts its the yellow one, from NZ lol)
#13
I've found that life I needed.. It's HERE!!
![Default](https://passionford.com/forum/images/icons/icon1.gif)
as i mentioned to you on facebook, TM Smiths in coatbridge straightened mine 2 years ago, its been running over 400bhp since and has been fine
but i cant remember where mine was bent, might have been the middle, but it was out as it had run no.4 big end shell thru to the copper so i assumed it was there but not sure
but i cant remember where mine was bent, might have been the middle, but it was out as it had run no.4 big end shell thru to the copper so i assumed it was there but not sure
Thread
Thread Starter
Forum
Replies
Last Post