Holley Pro Jection ??????
Thread Starter
Racer
Joined: Oct 2003
Posts: 429
Likes: 0
From: Plains Ga.
Holley Pro Jection ??????
I was wanting to know if a Holley ProJection 670cfm system will work ok on a sbc 350/350 hp to about 5500 rpm. If not, can the fuel injectors be modified or increase the fuel pressure. In one place I find Holley saying that it is good for up to 275 hp and another place that it is good to 325 hp. I would like some feedback from some member that have had experience with this system.
Thanks,
JTHVETTE
Thanks,
JTHVETTE
Thread Starter
Racer
Joined: Oct 2003
Posts: 429
Likes: 0
From: Plains Ga.
CFM formula ???
Originally Posted by Little Mouse
Find something that will allow more then 670cfm of air to your motor.
Accel has a lot of fuel injection systems.
Accel has a lot of fuel injection systems.
Size (cid) X Max. RPM / 3456 = CFM @ 100 % vol. eff.
350 X 5500 rpm / 3456 = 557 cfm
(350 X 5500= 1,925,000
1,925,000 / 3456 = 557)
Am I right or wrong?
If I am missing something, please let me know.
Help!!
JTHVETTE
Instructor
Joined: May 2006
Posts: 223
Likes: 1
From: Kennesaw GA
Yes, you need to look at your volumetric efficiency number. The only way you are going to achieve 100% is with a turbo or blower (perhaps more than 100% too). Seems like with stock heads and manifolds you may be looking at from 70% ~ 80% at best, which really lowers your CFM requirements. So theoretically the ProJection will be fine for a stock 350, but they only recommend it for engines under 275 hp, But that's mostly because of the fuel injectors themselves aren't rated for that kind of flow.
My buddy and I were looking into one of these setups for his '81, it seemed like a decent way to increase efficiency and a little bit better response. Seems like the newer digital kits are better than the old analog ones.
My buddy and I were looking into one of these setups for his '81, it seemed like a decent way to increase efficiency and a little bit better response. Seems like the newer digital kits are better than the old analog ones.
Thread Starter
Racer
Joined: Oct 2003
Posts: 429
Likes: 0
From: Plains Ga.
Holley Pro Jection
Originally Posted by GruntyPants
Yes, you need to look at your volumetric efficiency number. The only way you are going to achieve 100% is with a turbo or blower (perhaps more than 100% too). Seems like with stock heads and manifolds you may be looking at from 70% ~ 80% at best, which really lowers your CFM requirements. So theoretically the ProJection will be fine for a stock 350, but they only recommend it for engines under 275 hp, But that's mostly because of the fuel injectors themselves aren't rated for that kind of flow.
My buddy and I were looking into one of these setups for his '81, it seemed like a decent way to increase efficiency and a little bit better response. Seems like the newer digital kits are better than the old analog ones.
My buddy and I were looking into one of these setups for his '81, it seemed like a decent way to increase efficiency and a little bit better response. Seems like the newer digital kits are better than the old analog ones.
I didn't see a problem with the cfm ratings on the Holley system. I wanted to know if there was a way to increase the fuel pressure or increase the fuel injector size or output. A lot of people think that bIGGER is better when it comes to fuel systems. Too much is as bad as too little.
Thanks,
JTHVETTE
