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Old 11-04-2002, 12:26 AM   #1
jibber
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Member#: 6675
Join Date: May 2001
Chapter/Region: NWIC
Location: Your ECU
Vehicle:
98 SF5 some mods
01 allroad

Default injectors

does anyone have any info on why the injector sizes 550and up
seem so common. i was speeking with a friend of mine about this topic and he was telling me about the escort cosworths using i think he said 330cc injectors? anyone know why? both 2.0l engines both turbo why would there be such a big difference? the turbo on the cosworth is HUGE!!!

thanks
josh
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Old 11-04-2002, 04:29 AM   #2
teiva-boy
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Turbo size is one thing, but it depends on the amount of boost it's running. No sense to have huge injectors if it's only seeing some 7psi stock.
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Old 11-04-2002, 06:52 PM   #3
jibber
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98 SF5 some mods
01 allroad

Default injector size?

the injector size is 311cc on the stock escort cosworths this is good for 270hp at 15 to 16 psi of boost. about the biggest injectors ford motorsport uses is 503cc these are good for 420hp
the garretts flow more cfms than the ihi's. why do we use such big injectors? are we cooling combustion temps with fuel?

thanks all
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Old 11-04-2002, 11:53 PM   #4
WRBLUEWAGON
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2006 VW SUV

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our fuel rails are ****ty. My understanding is with fuel rails just added to the EJ20 15% to 20% gas would need to be taken away for them just not to run pig rich.

STI's only flow 530 so 370hp

Eric
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Old 11-05-2002, 03:46 PM   #5
n2xlr8n
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02 WRX MBP
It lives! ; )

Default Re: injector size?

Quote:
Originally posted by jibber
the injector size is 311cc on the stock escort cosworths this is good for 270hp at 15 to 16 psi of boost. about the biggest injectors ford motorsport uses is 503cc these are good for 420hp
the garretts flow more cfms than the ihi's. why do we use such big injectors? are we cooling combustion temps with fuel?

thanks all
I've often wondered that as well. IMO, it almost has to be related to the combustion chamber, rpm range, piston crown, cylinder head, and coolant flow design, as well as camshaft profile. In other words, Volumetric Efficiency. FWIW, I've noticed over the years some engine designs can make peak torque/hp with a really lean A/F, while others...you can't give 'em enough fuel.
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Old 11-05-2002, 06:50 PM   #6
jibber
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Member#: 6675
Join Date: May 2001
Chapter/Region: NWIC
Location: Your ECU
Vehicle:
98 SF5 some mods
01 allroad

Default injectors

i 'm wondering about turbo shaft speed / and impeller eficency. it's relation to combustion temps. the ihi turbos spin at something silly like 180,000rpm and a garrett t3 t4 spins at like 100,000rpm
this all has to make some sort of effect on combustion temps. could this be why the big difference in fueling needs.

thanks again
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