carbed and efi cams, same or different?
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On The Tree
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From: latrobe, pa
carbed and efi cams, same or different? is there a difference between a came for a efi motor and one for a carbed motor? like would a t-rex or similar cam work well in a lq4 with a carb and victor jr intake?
A carburetor doesn't necessarily require any different LSA than EFI, but a different style intake may. A single plane intake with unequal length short runners is going to want different valve events than running a FAST intake.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
They will both work but the engine can be made to run smoother at all rpms with efi vs a carburator. With a camshaft with lots of overlap the engine does not have a good signal to the carb(low vaccum) and the vacumm is what pulls the fuel out of the carb into the intake...with efi you can give the engine the best a/f ration at any given rpms...hence smoother idle and midrange than a carb as well as better economy.
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TECH Resident
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Well how about this, an efi cam in a carbureted vehicle will run fine and generally have excellent driveabily and sacrifice some performance in the upper rpm ranges and way down low off idle. A carb combination specific performance cam would generally be considered too rowdy for most long runner efi engines.
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On The Tree
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From: latrobe, pa
Originally Posted by andereck
Well how about this, an efi cam in a carbureted vehicle will run fine and generally have excellent driveabily and sacrifice some performance in the upper rpm ranges and way down low off idle. A carb combination specific performance cam would generally be considered too rowdy for most long runner efi engines.
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Originally Posted by chevydad
why would a carb sacrifice power down low and up high compared to efi?
If you heat the fuel or intake charge of a carbed engine, such as GM's heated element carb gaskets you gain many of the driveability and economy advantages of efi, but not to the full effect.
Last edited by andereck; Jan 25, 2007 at 11:15 PM.
Originally Posted by chevydad
a cam with a lsa of 110 will produce more vacuum than one with a 112 0r 113? or does overlap effect vacuum more than lsa?
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