[DeTomaso] Techno question: purpose built 351C for gas economy

[Thomas Törnblom]

On the trip to Le Mans this summer, my newly built engine got around 18 
mpg on Autobahn cruising.

This is with the Ford EFI, Crane 290/294 degree hydraulic roller cam, 
aussie CC 2V heads, dished pistons (~10.0:1 CR). This is also with the 
puny 345/35x15 tires and a stock 4.22:1 final, which makes it rev like 
crazy.

Thomas

JDeRyke at aol.com skrev:
> In a message dated 7/25/06 7:24:48 PM, cengles at cox.net writes:
> 
> << How small do they make 4 bbl carbs in terms of cfm?   Is there any record 
> of how much gas mileage one could theoretically get out of our old V8s? >>
> 
> Holley makes a 390 4bbl which is used by Buick V-6 guys and also by 
> restrictor-plate NASCAR guys. In the '80s we often used the next size- a 450 4bbl- on 
> our racing Corvairs. Our Pantera had a Holley 600 vac-sec carb for years. 
> IMHO, besides the carb, the biggest gas-sucker is the cam selected. In J & 
> J's completely stock (except for a Torquer 1 intake & the carb) engine when 
> first purchased eons ago, going to 'Vegas we got a consistent 24 mpg, steady 
> cruising at 70-80 mph in a pack of 15-20 Panteras. Adding an SVO hydraulic cam, 
> alloy heads w/10-1/2:1 compression, a tuned Holley 700 dp etc, etc we now get 
> right at 20 mpg at steady cruise speeds up to 110 or so. 
> You can get a noticable amount of the benefits of 2V heads by simply using a 
> 2V INTAKE on 4V heads that will guarantee more torque & better driveability 
> around town, and will absolutely fall on its face at 5000 rpms. The huge 
> mismatch in intake port diameters creates higher speed fuel/air-flow & a big 
> anti-reversion point (similar to what one gets with a port-plate) right at the head 
> which seems to help low speed torque. Others may have their favorite 
> combinations but this one is pretty simple & cheap to try. When JImmy and I did this, he 
> was still running a Holley 750 so if you combine it with a smaller carb, the 
> results should be better. 
> 
> Finally, there are fuel-flow meters used in aircraft that can be calibrated 
> for the density of street gasolines so you can get real-numbers in lbs/hr going 
> into your motor, before making any big changes.  Good luck, pal- J DeRyke
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