JDM/UKDM fuel injector differences?

CrunchyAdams82 · Post by **CrunchyAdams82** » Fri Oct 04, 2013 7:52 pm

Is there a difference between these two? Me thinks not, but just checking before I get a set refurbed.

Ta

Post by **RattyMcClelland** » Fri Oct 04, 2013 9:51 pm

One has touched UKDM and the other has touched JDM, but which Gen are they from 3rd, 4th or 5th Gen? They are different.
And how much are they to refurb. Aftermarket arnt expensive.

CrunchyAdams82 · Post by **CrunchyAdams82** » Sat Oct 05, 2013 12:19 am

They are 4th Gen from a UKDM engine. Just figured I would get them refurbed ready for when I get my conversion done. Then I'd have a fresh set of injectors to go in. But I was planning on putting them in an H22A.

How are they different then?

And refurb would be about £80 for all 4.

Post by **RattyMcClelland** » Sat Oct 05, 2013 7:24 pm

Why refurb? They wont need it. No difference between JD and UK.

CrunchyAdams82 · Post by **CrunchyAdams82** » Sat Oct 05, 2013 7:39 pm

Why refurb? To make them 'as good as new' & all flow equally.

Make sense?

Post by **RattyMcClelland** » Sat Oct 05, 2013 8:43 pm

Seriously they wont need it. They will all flow the same. With only petrol running thorough them, your fuel system will be the cleanest part of the car.
Waste of money IMO.

Post by **4thgenphil** » Sun Oct 06, 2013 12:01 am

RattyMcClelland wrote:Seriously they wont need it. They will all flow the same. With only petrol running thorough them, your fuel system will be the cleanest part of the car.
Waste of money IMO.

i have to diagree but £80 is expensive!

Post by **RattyMcClelland** » Sun Oct 06, 2013 12:20 am

4thgenphil wrote: i have to diagree

So you agree?

CrunchyAdams82 · Post by **CrunchyAdams82** » Sun Oct 06, 2013 3:31 am

Yeah, £80 is expensive - but they change all the seals & filter baskets for genuine parts. And give you a flow rate print out. (Mr Injector I refer to).

I could get such a service done for £48+del, but they use cheap, generic seals & filters (if they deem it necessary to change them at all) that don't always fit correctly.

I have just heard that after 60,000 miles or so, the spray patterns can all become uneven, and will probably have a slight difference in flow rate between them all. Although this may not be noticeable in everyday driving conditions, the fact of the matter is you are quite possibly losing a little bit of power/fuel economy & not running as smoothly as what you would be with brand new injectors. Especially if they've done 100,000 miles like the ones I have in my possession.

I just want the best for my engine, when I do the H22 conversion on my Gen 3 in the new year. And figured seeing how I've now got a set which aren't currently being used, it would make sense to try & get them up to 'as new' standard now, ready for installation when the time comes.

Ideally i would buy brand new uprated injectors, but these are quite expensive. And not worth doing on a stock engine imo. Not planning on doing this until I start my project engine next year some time.

What I will say is I work in a laboratory, and we have a ultrasonic bath used for cleaning ceramics. It uses isopropyl alcohol (IPA/Propan-2-ol) to be specific. But I also have at my disposal methanol & acetone if required. Do you think that would be any good? If so, which chemical would be best for cleaning them?

And has anybody ever had injectors apart? Cos I have not. Can someone explain how to achieve this, and what to look out for?

Thanks

Post by **SPYDOR** » Sun Oct 06, 2013 1:08 pm

Would be interesting to see the flow rates before and after they are ultrasonically cleaned as my Prelude is at 125k miles and I often wondered about getting this done.

It makes me recall an old episode of Top Gear where they tried to make a 2002 Renault Avantime faster around the track by modding it > Homemade Evo The car was 6 years old and was down from 210bhp to 157bhp!! I don't think it had been serviced properly as they gave it some love and managed to get it back up to 206bhp after changing the air filter, the intake manifold and replacing the fuel injectors. I am sure things like fuel filter, valve clearance adjustments and even a good oil change would help raise the power somewhat but it would be interesting to know how much performance can be restored by replacing or ultrasonically cleaning the fuel injectors.

I discussed this with Rich at Performance Autoworks a few years back and was told the OEM fuel injectors in Hondas are so good that having them cleaned is almost always unnecessary during the average life of the vehicle.

Does anybody know of any independent tests done on this as its usually always the ultrasonic cleaning companies that are the ones showing us how much power we are losing...