Need injector advice

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May 18, 2010 | 12:43 AM

hitmanws6

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From: Orange, CA

Need injector advice

I plan on running a H/C 355 in the future. Heads will be heavily ported, 2.02/1.60 valves with 58cc combustion chambers. Cam will be a Comp XE 236/242. What injectors would be the best for that setup? I'm looking at the SVOs right now, any advice is appreciated

May 18, 2010 | 03:08 AM

Wicked94Z

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From: Spokane, Wa

36# will probably be fine

May 18, 2010 | 03:28 AM

GIZMO

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From: Shelby, NC

I would run the SVO 24 lbs. You will get a ton of advice to go larger. If you do decide to follow that route I would suggest nothing larger than 30 lbs.

May 18, 2010 | 05:17 AM

firehawk238

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i would run the 36# SVO injectors. i have them in my car and once you calculate for the difference in fuel pressure they end up 37.8lb/hr injectors. almost as if i were running 38# injectors. at WOT the most ive used is 70% on my duty cycle. before with my 24# injectors i was hitting 109% duty cycle. just make sure you calculate correctly for the fuel pressure difference as the SVO injectors are flow'd with 38psi and GM LT1 fuel systems run 43.5psi. makes a big difference. beyond that you will be ok with the 36# SVO's. hope this helps.

May 18, 2010 | 08:58 AM

RamAir95TA

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From: South Jersey

Multiply your target HP x .07 = suggested injector size.

May 18, 2010 | 09:24 AM

A20SVT00

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From: WESLACO

Quote:

Originally Posted by GIZMO

I would run the SVO 24 lbs. You will get a ton of advice to go larger. If you do decide to follow that route I would suggest nothing larger than 30 lbs.

sorry to highjack but how about the stock 24 will they work with that 355 i have the same combo i was going to stay with stock injectors i already install a 255 pump

May 18, 2010 | 09:26 AM

A20SVT00

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From: WESLACO

i will install 30lb or more till i get nos kit

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May 18, 2010 | 01:06 PM

GIZMO

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From: Shelby, NC

Quote:

Originally Posted by A20SVT00

sorry to highjack but how about the stock 24 will they work with that 355 i have the same combo i was going to stay with stock injectors i already install a 255 pump

As far as performance goes, I have always found that the smallest injector that I can get away with works best. Especially in the first sixty feet. I do play with fuel pressure some. I have 24 lb SVO's in Gump @ 50 PSI. The kids stock internals car has 19 lb SVO's @ 43 PSI. Neither is maxed out. The only time that I would see duty cycle being an issue would be if you were running wide open throttle for a long period of time (road racing?).