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Home > Help Needed / General Tech Chat > crankshaft, crossdrill or not? | |||||||
67 Posts Member #: 8956 Advanced Member Algarve/Portugal |
22nd Aug, 2017 at 12:05:13pm
As per title, crossdrill or not, just finish wedging and polish my crank, and start thinking in drill the mains, does it wort? whats the best way to drill them, across the main or 90º whit existing hole?
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12307 Posts Member #: 565 Carlos Fandango Burnham-on-Crouch, Essex |
22nd Aug, 2017 at 12:30:30pm
with the RS cams your going to be spinning pretty high, peak will be in the order of 8-8.5k, so i would cross drill,
On 28th Aug, 2011 Kean said:
At the risk of being sigged... Joe, do you have a photo of your tool? http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1 https://joe1977.imgbb.com/ |
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67 Posts Member #: 8956 Advanced Member Algarve/Portugal |
22nd Aug, 2017 at 01:18:49pm
Just drilling straight across the mains and big ends or any specific angle? |
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1030 Posts Member #: 1291 Post Whore Suffolk / Birmingham |
22nd Aug, 2017 at 07:22:06pm
I'm not so sure it's worth it personally. Edited by slater on 22nd Aug, 2017. |
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109 Posts Member #: 10368 Advanced Member Australia |
22nd Aug, 2017 at 11:09:43pm
I think cross drilled mains are a good thing, along with checking oil slot alignment, removing hard edge off feeder holes etc, to make oil flow to bearings as unobstructed as possible,,,, as to whether it makes a difference, i haven't been wanting to back to back test one with cross drilled crank against one without until destruction... so it sounds good in theory but maybe just done to make me feel better.... ? |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
23rd Aug, 2017 at 08:10:26am
On 22nd Aug, 2017 slater said:
I'm not so sure it's worth it personally. I concur On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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1767 Posts Member #: 9165 Previously josh4444 Australia, brisbane |
23rd Aug, 2017 at 08:28:16am
isnt the whole point of x drilling the journal to help reduce the centrifugal force as the rpms rise?
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Forum Mod 10979 Posts Member #: 17 ***16*** SouthPark, Colorado |
23rd Aug, 2017 at 09:51:37pm
I'm pretty sure that when using the solid/solid bearing shells, the benefits of cross drilling (the mains) are there. With the later grooved/solid mains though, I'm struggling to see the need as oil is able to be fed for approx half of the crank rotation instead of a small amount of time with the older mains.
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
23rd Aug, 2017 at 10:37:35pm
The attached is worth a read. It does only touch on the subject but supports the idea that the plain bottom bearing is better. It also talks about the intermittent oil supply to the big end does not really affect big end reliability.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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