EFI and new cam selection - Chevelle Tech
EFI Caution: Beyond here be monsters...

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post #1 of 7 (permalink) Old Dec 10th, 18, 10:13 PM Thread Starter
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Wes
 
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Question EFI and new cam selection

Engine is a 396 with 049 heads, going in with a new cam and plan on putting on a EFI setup next fall, would you use one of the EFI cams like the ones COMP cams or Lunati have or just go will a cam that has decent vacuum say 12" or above.
Thoughts?
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post #2 of 7 (permalink) Old Dec 11th, 18, 8:10 AM
 
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I would cam the motor based on how you want to use the car.
Since it’s a 396, I’m guessing your looking at a throttle body efi like fitech or sniper. I know my fitech works with 7” of vacuum as that’s what my motor pulls. I believe the sniper system will too, but I don’t know for sure.
Your best bet would be to contact a cam grinder / company and see what they recommend for your combo and intended use.
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post #3 of 7 (permalink) Old Dec 11th, 18, 12:16 PM
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Chris
 
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Re: EFI and new cam selection

as mcollins6 says, cam it to what you want the engine to do. I'd only recommend not going below 110 LSA, as EFI doesn't like overlap.

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post #4 of 7 (permalink) Old Dec 11th, 18, 12:47 PM
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Mike
 
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Re: EFI and new cam selection

Vortec Pro put me on this Isky cam. Currently I have a Comp Thumpr cam with no vacuum which i've read TB FI doesn't like. My Fitec runs fine, but i have no comparison. So I'm throwing the Isky in this weekend and looking forward to having vacuum and, oh, power brakes..

396265/275 RR-265/275 HYDRAULIC ROLLER

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2000-6000 lift .530 .533 lash .000 advertised duration 265 275 @ .050 218 228 LSA 112

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Gen IV 454 (out of C30 ), 390 heads 1.88/2.19 valves by Vortecpro, with ISKY Hyd Roller cam (at 050 218 int./228 exh, lift 530 int./552 exh.), RPM performer intake, Fitech 600HP, Dougs headers, and M21, Gear Vendors OD, 3.73's, UMI Suspension, Viking coilovers.
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post #5 of 7 (permalink) Old Dec 11th, 18, 2:28 PM
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Chris
 
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Re: EFI and new cam selection

I think I saw one of the holley techs say 7*on vaccum was the basement for sniper.

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post #6 of 7 (permalink) Old Dec 11th, 18, 6:35 PM Thread Starter
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Wes
 
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Re: EFI and new cam selection

Quote:
Originally Posted by mdelgado View Post
Vortec Pro put me on this Isky cam. Currently I have a Comp Thumpr cam with no vacuum which i've read TB FI doesn't like. My Fitec runs fine, but i have no comparison. So I'm throwing the Isky in this weekend and looking forward to having vacuum and, oh, power brakes..

396265/275 RR-265/275 HYDRAULIC ROLLER

Good mid-range power. Good vacuum & good idle. 3.23-3.70
axle ratio. 9.5-1.5:1 compr. Computer compatible with stage 1
chip. Stock converter. Up to 650 CFM Carb.

2000-6000 lift .530 .533 lash .000 advertised duration 265 275 @ .050 218 228 LSA 112
That is about the size of cam that I have been looking at, the one I have now is EDL-7162. Edelbrock. RPM: 1500-6500. @.50" 240/246
Duration 300/306. Lift 560/573. LSA 112. ICL 110 and I really don't like it much.
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post #7 of 7 (permalink) Old Dec 19th, 18, 9:14 AM
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Rick
 
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Re: EFI and new cam selection

Quote:
Originally Posted by RR24 View Post
Engine is a 396 with 049 heads, going in with a new cam and plan on putting on a EFI setup next fall, would you use one of the EFI cams like the ones COMP cams or Lunati have or just go will a cam that has decent vacuum say 12" or above.
Thoughts?
What EFI? That would help knowing. With MPFI and a system like Holley Dominator/HP you can control injector end angle. So in my opinion, go with a wider LSA and then start spraying fuel after the EVC (exhaust valve closing). Gain some good driveability.

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