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Old 10-04-2004, 01:12   #1 (permalink)
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Big cams & economy

Im just curious about big cams and hey they would relate to fuel economy in a V8.
Since a cam would move the powerband further up in the rpm range would that mean that less fuel would be used in the low rpm range?

Or does a cam just move the efficiency range further up meaning that the engine would be inefficient (less power, same or larger amount of fuel) down low and provide more power up high where the max VE% is at?
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Old 10-04-2004, 01:21   #2 (permalink)
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Re: Big cams & economy

Fuel economy suffers abit but not as much as driveabillity, too big will see you bunny hop down the road in too low a gear, bottom end grunt will suffer the most at low rpm's
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Old 10-04-2004, 01:22   #3 (permalink)
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Re: Big cams & economy

Depends ??? What you consider big cam ???
TFS 1 or 2031[or timing around those numbers] are nice street cams and reasonably good on fuel...
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Old 10-04-2004, 04:39   #4 (permalink)
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Re: Big cams & economy

BIG CAM and economy are two words that dont go together in the same sentence.
I was running a big-ish 248@.050 cam and fuel was the last thing on my mind and the first thing I put in my car every time I drove it.!!!!
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Old 10-04-2004, 17:59   #5 (permalink)
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Re: Big cams & economy

Hehe, yeh i wouldnt put in a cam with fuel economy in mind.

I meant would the fuel economy improve in the low range similar to a turbo?
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Old 10-04-2004, 21:38   #6 (permalink)
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Re: Big cams & economy

mum's manual EL GT with a E303 cam used approx 2l per 100km on a 450km trip to Albany LESS than her 5 litre EL Fairmont Ghia (admittantly it was auto).

however her 5.0 EL Fairmont would use 1 litre less again than her auto EF2 Fairmong Ghia.

The E303 cam will shudder if you're in 5th gear and try to do less than approx 70kms
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Old 10-04-2004, 21:39   #7 (permalink)
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Re: Big cams & economy

btw the EF2 was a 6banger (XR6 motor)
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Old 10-05-2004, 04:51   #8 (permalink)
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Re: Big cams & economy

Quote:
Originally Posted by xr8_sprint
mum's manual EL GT with a E303 cam used approx 2l per 100km on a 450km trip to Albany LESS than her 5 litre EL Fairmont Ghia (admittantly it was auto).

however her 5.0 EL Fairmont would use 1 litre less again than her auto EF2 Fairmong Ghia.

The E303 cam will shudder if you're in 5th gear and try to do less than approx 70kms

The question is, was that economy the result of the cam or the manual?
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Old 10-05-2004, 05:29   #9 (permalink)
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Re: Big cams & economy

im not sure, hence i said "admittantly it was auto".

2l per 100km is pretty good improvement though considering this thing has like 50 more kw
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