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tips, technology, tools and techniques related to vehicle driveline components

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rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

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Fuel injectors
Posted by: rficalora
Date: October 17, 2017 03:03PM

As I'm getting ready to install the ProFlo system I picked up, I'm wondering if I should have the injectors cleaned 1st. Given it was installed & possibly run on the PO's engine and then removed & sat for several years, I'm thinking there may be varnish built up. Thoughts - good plan or waste of money?


DiDueColpi
Fred Key
West coast - Canada
(1365 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

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Re: Fuel injectors
Posted by: DiDueColpi
Date: October 17, 2017 08:18PM

Get them cleaned and tested for sure Rob.
Nothing worse than spending hours on a tune only to find out that you're setting up on bad injectors.

Live like you mean it.
Fred.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6469 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

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Re: Fuel injectors
Posted by: BlownMGB-V8
Date: October 17, 2017 09:59PM

Definitely cleaned and tested by a competent shop. Have them give you a flow graph based on injector on-time with a minimum of four-five data points and an extension to give the injector dead-time, and full saturation flow rate. These are the absolute minimums you should have but you should also get flow spread at each data point so you know for instance, what the % variance among the full set is at your idle flow rate.

Ideally you would have no variance. But this is the real world and it often doesn't work out that way.

Jim
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rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Fuel injectors
Posted by: rficalora
Date: October 17, 2017 10:49PM

Any particular company to use... or avoid?



Edited 1 time(s). Last edit at 10/17/2017 10:51PM by rficalora.


MG four six eight
Bill Jacobson
Wa state
(324 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: Fuel injectors
Posted by: MG four six eight
Date: October 18, 2017 01:30AM

Rob,

I've had good luck using Witch Hunter Performance [www.witchhunter.com] in the past.

Bill


rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Fuel injectors
Posted by: rficalora
Date: October 26, 2017 06:44PM

Looks like getting them cleaned was well worth the money... 4 of 8 injectors weren't firing at all (probably due to dried fuel from prior owner's use). All good now...
Injectors.jpg


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6469 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Fuel injectors
Posted by: BlownMGB-V8
Date: October 27, 2017 09:51AM

I only see full flow test results. You really do need the injector dead time to be able to enter that in the controller settings, and the only way I know to get that is to do chart a series of 4 or 5 flow tests at different pulse rates. Just because they flow the same fully saturated does not mean they flow the same at 4 ms. (idle)

Jim



MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

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Re: Fuel injectors
Posted by: MGBV8
Date: October 28, 2017 10:34AM

Injector R Us? Facalora? ;)


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