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displaying posts 26 to 39 of 39
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| Author | Subject: Group N oil pump Spring |
 allanallen
Seasoned Pro  Location: Buxton Registered: 01 May 2007 Posts: 1,399 Status: Offline |
Post #26
phillipm wrote: It's not so much the coilbound length that matters - it's the spring preload, making it go coilbound to early will result in what you experienced - pressure going through the roof at high revs when the ports choke and seals popping out. Mine was popping the seals at idle  I think there was far to much preload and the pump was giving the engine all it had!! ________________________________________ www.bridgecraftmotorsport.co.uk |
 Posted 25th Sep 2009 at 20:19
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #27
 If you hang on I'll get some graphs up to show what I mean. ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 25th Sep 2009 at 20:23
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allanallen
Seasoned Pro Location: Buxton Registered: 01 May 2007 Posts: 1,399 Status: Offline |
Post #28
phillipm wrote: If you hang on I'll get some graphs up to show what I mean. Graphs! Who needs graphs, I was covered in bloody oil ________________________________________ www.bridgecraftmotorsport.co.uk |
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Posted 25th Sep 2009 at 20:29
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #29
You out to start going clubbing with Rikky, I hear he likes that sort of thing....________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 25th Sep 2009 at 20:34
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #30
Right - these are just arbitary graphs, they're not from an engine, just a quick set of fluid flow calcs:Anyway, assume this is a standard engine, once the bypasses choke, the pressure ramps up against the relief spring, which pops off and give a nice gentle rising curve thereafter (the gradient of the curve is altered by various designs around the port to make the blowoff more progressive, but hey..) :  Now, if you fit a longer spring of the same rate, you'll have more preload and the oil pressure will look something like this, as you can see the initial part of the graph ramps up faster and for longer before the relief blows:  And this is what happens if you cock things up, and install a spring/spacer so long, that even when the relief valve blows, it's still choking the ports:  As you can see, you end up oily. ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 25th Sep 2009 at 20:48
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allanallen
Seasoned Pro Location: Buxton Registered: 01 May 2007 Posts: 1,399 Status: Offline |
Post #31
Oily indeedIts a shame its such a pain to keep stripping the pump and trying different size shims really. ________________________________________ www.bridgecraftmotorsport.co.uk |
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Posted 25th Sep 2009 at 21:01
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #32
/pats lovely port-flow calculator that predicts the right size shim for the pressure... ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 25th Sep 2009 at 21:04
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allanallen
Seasoned Pro Location: Buxton Registered: 01 May 2007 Posts: 1,399 Status: Offline |
Post #33
Does it do lottery numbers too? ________________________________________ www.bridgecraftmotorsport.co.uk |
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Posted 25th Sep 2009 at 21:08
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #34
 worth a shot. ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 25th Sep 2009 at 21:10
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daveyboy
aka Jim Davey  Location: Southampton Registered: 01 Oct 2007 Posts: 8,648 Status: Offline |
Post #35
phillipm wrote: /pats lovely port-flow calculator that predicts the right size shim for the pressure... So what size shim would you reccommend? ________________________________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.Some of my services: (See my for sale threads) Engine mount/chassis repair Solid Beam Mounts BACK IN PRODUCTION Harness bars |
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Posted 25th Sep 2009 at 21:32
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #36
Dunno, mine's setup for Nissan V6's Course, if you bolt one of those in I can tell you ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 25th Sep 2009 at 21:40
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mark.evs
Senior User  Location: Near Bridgend Registered: 21 Dec 2010 Posts: 527 Status: Offline |
Post #37
Sorry to bring up an old thread but its kinda the same subject. If an oil cooler is added, with the added extra length of oil pipes will there still be enough oil pressure by the time the oil gets back round to the cam and crank spray bars? cheers in advance.________________________________________ My GTi6 track projectWhite Rallye project |
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Posted 19th May 2011 at 15:46
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Rich E
Forum Admin Location: Hertfordshire Registered: 27 Apr 2005 Posts: 7,757 Status: Offline |
Post #38
mark.evs wrote: Sorry to bring up an old thread but its kinda the same subject. If an oil cooler is added, with the added extra length of oil pipes will there still be enough oil pressure by the time the oil gets back round to the cam and crank spray bars? cheers in advance. Yeah easily. There's nothing to worry about. ________________________________________ Rich |
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Posted 19th May 2011 at 16:41
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mark.evs
Senior User Location: Near Bridgend Registered: 21 Dec 2010 Posts: 527 Status: Offline |
Post #39
cheers mate. puts my mind at ease.________________________________________ My GTi6 track projectWhite Rallye project |
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Posted 19th May 2011 at 16:45
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