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Author: Subject: Bosch 044 pre filter to avoid cavitation
jimgiblett

posted on 22/4/19 at 07:58 AM Reply With Quote
Bosch 044 pre filter to avoid cavitation

Hi

Any recommendations on a prefilter for an 044 pump. Most web searches suggest 100 micron but sytec only go up to 55 micron.

Running c300hp and have a 10/20 micron sytec motorsport filter between the pump and the injectors.

Ideally want 10mm barb fittings rather an lots of AN adaptors as this is low pressure side.


Cheers

Jim

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flak monkey

posted on 22/4/19 at 08:26 AM Reply With Quote
I ran one of these in front of the pump (screwed directly in) on my Camaro. That was a 380lph pump (600hp), no issues with cavitation.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F202366903368

You can get AN8 to M18x1.5 adapters to fit them straight on to the pump if you have space.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F170700038263

And one of these for the inlet side

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F382892564169

[Edited on 22/4/19 by flak monkey]





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BaileyPerformance

posted on 22/4/19 at 09:14 AM Reply With Quote
You do not need a pre-filter on an genuine 044, only use a filter after the pump.
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jimgiblett

posted on 22/4/19 at 10:16 AM Reply With Quote
quote:
Originally posted by BaileyPerformance
You do not need a pre-filter on an genuine 044, only use a filter after the pump.


I did hear that the 044 pump has gauze in it but it cannot be cleaned.

So this is a bit belt and braces.

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jimgiblett

posted on 22/4/19 at 10:20 AM Reply With Quote
quote:
Originally posted by flak monkey
I ran one of these in front of the pump (screwed directly in) on my Camaro. That was a 380lph pump (600hp), no issues with cavitation.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F202366903368

You can get AN8 to M18x1.5 adapters to fit them straight on to the pump if you have space.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F170700038263

And one of these for the inlet side

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F382892564169

[Edited on 22/4/19 by flak monkey]


Never Heard of Epman before but will give them a go

Thanks

Jim

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Nile_rt

posted on 22/4/19 at 11:07 AM Reply With Quote
Smaller numbers mean better filtration. 55 micron will filter better than 100 micron. So I'd just use that if it will still flow enough
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jimgiblett

posted on 22/4/19 at 01:35 PM Reply With Quote
quote:
Originally posted by Nile_rt
Smaller numbers mean better filtration. 55 micron will filter better than 100 micron. So I'd just use that if it will still flow enough


Yes but bigger number better flow which is what I am looking for. Just want to protect the pump from big stuff. Have a 10/20 micron filter between the pump and the injectors. Over 80 was recommended for pre pump preferably 100.

Over the years travelling around Europe I have had to clean my pre filter on numerous occasions. Most production cars have bag filters for this reason.

Cheers

Jim

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flak monkey

posted on 22/4/19 at 04:35 PM Reply With Quote
100 micron is correct for pre filter. Any smaller can lead to restriction, also large pleated washable filters flow much better than sintered metal etc. Those Epman ones are cheap RIP offs of expensive ones but they work.

AEM and Bosch recommend that their pumps are fitted with a 100 micron pre filter in performance applications.

15 or 20 micron is fine for high pressure filter.





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coyoteboy

posted on 28/4/19 at 02:28 PM Reply With Quote
Most OEM installs have a very coarse screen before the pump, and are expected to last 200k miles. I'd have zero problem just running a high pressure filter. If your pump fails in 1/4 of the time it would in an OEM installation, you prob won't own the car then anyway!





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Smoking Frog

posted on 29/4/19 at 09:35 AM Reply With Quote
quote:

Bosch 044 pre filter to avoid cavitation



Will a pre filter actually cure this?

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adithorp

posted on 29/4/19 at 09:46 AM Reply With Quote
No, but one with not enough glow can cause it, which is why Jim is looking for one with the best flow AIUI.





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jimgiblett

posted on 29/4/19 at 09:51 AM Reply With Quote
I had a pre pump filter that was too restrictive causing cavitation so I have replaced it with one that seems to have reduced / eliminated the cavitation. The fine filter is now post pump only.
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froggy

posted on 29/4/19 at 03:44 PM Reply With Quote
I used lpg vapour filters behind the 044 in one of my cars , worked a treat and have barbs to suit hose so worked mint with the 14mm hose fitting on the 044 I had . Cost a couple of quid so changed it every year and it caught a few bits when I cut it open to see how it coped with liquid rather than vapour





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jimgiblett

posted on 2/5/19 at 01:45 PM Reply With Quote
All sorted. Cavitation gone but fluffy midrange that was getting worse and worse.

Been to the Rolling Road today to discover problem was a dying MAF sensor. Full power now restored.

[Edited on 2/5/19 by jimgiblett]

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baz-R

posted on 17/7/19 at 02:33 PM Reply With Quote
if you got bits in your system enough to worry about the gauze in a 044 then a pre filter is not your problem you need to clean your system

you shouldn't run pre filters before your pump and you only find pickup strainers on in tank pumps

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