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Author Topic: Autotech HPFP failure  (Read 44051 times)

Offline vRS Carl

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Re: Autotech HPFP failure
« Reply #45 on: January 03, 2011, 10:31:23 am »
Quote from: vRStu on January 02, 2011, 09:07:19 pm
We use a similar thing at work - Spectrographic oil analysis

I smell a Group Buy  :party: :party:


 :evilgrin:
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Offline vRStu

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Re: Autotech HPFP failure
« Reply #46 on: January 03, 2011, 10:35:56 am »
Quote from: vRS Carl on January 03, 2011, 10:31:23 am
Quote from: vRStu on January 02, 2011, 09:07:19 pm
We use a similar thing at work - Spectrographic oil analysis

I smell a Group Buy  :party: :party:


 :evilgrin:


You wouldn't like their prices - http://www.qinetiq.com/home.html  :fighting:
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Stu...

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Offline KRL

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Re: Autotech HPFP failure
« Reply #47 on: January 03, 2011, 10:38:39 am »
Sent an email to a company last night with regard to oil testing and got a reply today.  The sampling kit would cost £25 which includes a paid for jiffy bag to send the sample back in and they will get back to you withing 48 hours with the test results.

Here are some details:
https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=1RsaMk7FWLWpFfEJCK-YMxzgpfiWGx44xr8ghn4RMtdjgDZn4u0RuUDdlDNdJ&hl=en_GB
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Offline PDT

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Re: Autotech HPFP failure
« Reply #48 on: January 03, 2011, 11:34:11 am »
Remeber that oil analysis will tell you whats in the oil but not how it got there. Fuel can enter the lubrication system through many conditions/faults.
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Offline vRStu

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Re: Autotech HPFP failure
« Reply #49 on: January 03, 2011, 12:36:03 pm »
The oil analysis is very good but for the everyday car user would work out quite expensive to do routinely.  Sure it would only tell you that there is fuel in the oil but in a large quantity and if you were running a high flow pump then it'd certainly point you in the right direction.
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Stu...

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Offline KRL

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Re: Autotech HPFP failure
« Reply #50 on: January 03, 2011, 12:55:30 pm »
At £25 a pop and if you only do it once a year I don't think it is much expense compared to the potential savings you could make by spotting a problem early.
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Offline muckipup

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Re: Autotech HPFP failure
« Reply #51 on: January 03, 2011, 03:30:20 pm »
Quote from: vRStu on January 02, 2011, 09:07:19 pm
Quote from: KRL on January 02, 2011, 07:06:00 pm
I think I will start doing some oil analysis every other oil change to catch problems like this.  A quick google found this company:
http://www.theoillab.co.uk/

A report costs £26.95.  Think this could be well worth it in the long run if you weigh it up against the costs of potential failure.

We use a similar thing at work - Spectrographic oil analysis

No spectrographic analysis needed for me - I just had a routine sniff at the dipstick knowing that this was a telltale sign of failure...and it was absolutely stinking of petrol.
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Offline muckipup

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Re: Autotech HPFP failure
« Reply #52 on: January 03, 2011, 03:32:29 pm »
Quote from: Timmyboy on December 30, 2010, 11:49:58 pm
Just out of interest Dave, have you been changing your follower?

Absolutely Tim. Every 10k and everything was fine. However, my issue was about failure of a seal within the pump rather than the more common / more historic complaints of piston seizure or cam follower wear or cam damage.
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Offline vRS Carl

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Re: Autotech HPFP failure
« Reply #53 on: January 03, 2011, 05:55:19 pm »
I don't think it's a failure of the seal per se.

My understanding is that due to the stepped design in the piston fuel gets in behind that step (due the the lubrication using fuel). Once the piston is on it's return stroke it is trying to compress the fuel. Liquid can't be compressed so the fuel has to go somewhere and it will inevitably choose the path of least resistance. Which in this case is past the seal.

So rather than the seal failing. It is being asked to do something it wasn't designed to, due to the step in the piston. So if Autotech re-designed the piston to be one diameter it's length then, in theory, this would solve the problem.
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Offline micky 32

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Re: Autotech HPFP failure
« Reply #54 on: January 03, 2011, 05:59:23 pm »
Quote from: vRS Carl on January 03, 2011, 05:55:19 pm
I don't think it's a failure of the seal per se.

My understanding is that due to the stepped design in the piston fuel gets in behind that step (due the the lubrication using fuel). Once the piston is on it's return stroke it is trying to compress the fuel. Liquid can't be compressed so the fuel has to go somewhere and it will inevitably choose the path of least resistance. Which in this case is past the seal.

So rather than the seal failing. It is being asked to do something it wasn't designed to, due to the step in the piston. So if Autotech re-designed the piston to be one diameter it's length then, in theory, this would solve the problem.

So why hasn't mine over the 65k i have used it put petrol in my oil?
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Offline vRS Carl

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Re: Autotech HPFP failure
« Reply #55 on: January 03, 2011, 06:02:01 pm »
Dunno if i knew that i'd be making millions selling Internals  :laugh:

Seriously though you may just be lucky in that the fuel isn't getting in behind the step in the piston. I was fine for 53k miles :smiley:
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Offline micky 32

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Re: Autotech HPFP failure
« Reply #56 on: January 03, 2011, 06:04:20 pm »
Quote from: vRS Carl on January 03, 2011, 06:02:01 pm
Dunno if i knew that i'd be making millions selling Internals  :laugh:

Seriously though you may just be lucky in that the fuel isn't getting in behind the step in the piston. I was fine for 53k miles :smiley:

You just have to be careful what you read out on the net, especially when you have competition with different pumps etc :wink: as far as i remember comparing to the OEM one the AT is just a slightly bigger piston.
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Offline vRS Carl

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Re: Autotech HPFP failure
« Reply #57 on: January 03, 2011, 06:13:17 pm »
No the Autotech is Stepped whereas the OEM & APR are not.

Can't find a pic of the piston on its own but you can see in this pic the difference in shaft diameter at either end



Whereas the APR one



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Offline micky 32

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Re: Autotech HPFP failure
« Reply #58 on: January 03, 2011, 06:23:32 pm »
On the subject off pumps has anyone rung where the bolts go in? One of mine won't tighten properly  :fighting:
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2008 Octavia vRS K04'd , Forge twintercooler, Evoms, Autotech uprated pump, full Milltek exhaust 324bhp on JKM's rollers ;-)

Offline vRS Carl

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Re: Autotech HPFP failure
« Reply #59 on: January 03, 2011, 06:26:11 pm »
Quote from: micky 32 on January 03, 2011, 06:23:32 pm
On the subject off pumps has anyone rung where the bolts go in? One of mine won't tighten properly  :fighting:

Yep i did that with mine.

Required a Helicoil fix :happy2:

Your obviously to harsh with the wrench like moi :laugh:
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