06-02-2012, 09:50 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,741
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Not Ranked
A blown Modmotor is about the same size as a 427 SOHC and it literally fills the engine compartment with wall to wall motor. Properly done with attention to polshing things like the valve covers and blower driver it is a visually stunning sight when you open the bonnet.
From a period correct point of view it is anathema - it simply isn't. From a power perspective you can hit 650 RWHP with a 4.6L Modmotor that puts north of 500 RWTQ down at 1800 rpm and well past 600 once you cross 2000 rpm. The seat of the pants dyno gives five stars to these engines. The classic rumpity rump idle is missing and will not produce the same audible note at idle the classic pushrod engines do.
When you put one in a roadster like ours, you literally have lightning in a bottle plus it starts in all kinds of weather, gets 25+ mpg on the highway and is an all around pleasant driving experience. When you flex its muscles it can scare you - but then any Cobra north of 500 FWHP is a pretty impressive ride.
A 5.4L version while a tight fit can be done but you are looking at 900+ RWHP once you start to modify it. If you thought the 4.6L version was scary at 650 RWHP the 5.4L version is suicidal and not necessary except for HP bragging rights.
Ed
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