Hopping up the 500 Cadillac
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(Edelbrock misspelled four times as Edlebrock) |
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[[File:Mts cad head.jpg|thumb|left|600px|MTS custom aluminum 76cc "FR" head, ~$3500/pair ca. 2012]] <br style="clear:both"/> | [[File:Mts cad head.jpg|thumb|left|600px|MTS custom aluminum 76cc "FR" head, ~$3500/pair ca. 2012]] <br style="clear:both"/> | ||
| − | *The | + | *The Edelbrock intake works good on a 500 inch or smaller motor if you don’t exceed 4500 rpm. Larger motors or those with good heads need the new single plane from MTS. Power will NOT drop off like the Edelbrock which is airflow limited. The Edelbrock will make 30-40 ft/lbs more torque under 3500 rpm. The MTS is worth 50 ft/lbs torque and 50 horsepower at 5000 rpm over the Edelbrock. |
[[File:Mts single plane intake cad.jpg|thumb||left|600px|MTS single plane aluminum intake manifold]] <br style="clear:both"/> | [[File:Mts single plane intake cad.jpg|thumb||left|600px|MTS single plane aluminum intake manifold]] <br style="clear:both"/> | ||
| − | *The factory Q-jet works good on the | + | *The factory Q-jet works good on the Edelbrock. It does NOT seem to work very well on the single plane even with rejetting. Reversion from the huge secondaries on the single plane may be the problem. |
*Multiple sizes and types of carburetors were tried. Best torque and horsepower with the large chamber heads was with an out-of-the-box 750 Holley. Best by 20 horsepower. The large chamber heads flowed only 710 cfm MAX measured through the carburetor at 5200 rpm under load on the dyno. Larger carbs up to 1000 cfm were tried and ALL lost horsepower and torque. | *Multiple sizes and types of carburetors were tried. Best torque and horsepower with the large chamber heads was with an out-of-the-box 750 Holley. Best by 20 horsepower. The large chamber heads flowed only 710 cfm MAX measured through the carburetor at 5200 rpm under load on the dyno. Larger carbs up to 1000 cfm were tried and ALL lost horsepower and torque. | ||
*The long stroke Cadillac, whether 4.300" stock or 4.600" stroker, needs plenty of cam. Several cams have been tried. For any type of performance use, a minimum of 234-244 degrees intake duration at 0.050" tappet rise with as much lift as you can get, works well. This cam will peak at 5100 rpm but still have good torque at 3000 rpm. With really good heads, add 10 degrees or 244-254 degrees intake duration. Stock heads and stock valves only need about 220-230 degrees intake duration. Anything bigger will not flow any more air because of head flow limits. | *The long stroke Cadillac, whether 4.300" stock or 4.600" stroker, needs plenty of cam. Several cams have been tried. For any type of performance use, a minimum of 234-244 degrees intake duration at 0.050" tappet rise with as much lift as you can get, works well. This cam will peak at 5100 rpm but still have good torque at 3000 rpm. With really good heads, add 10 degrees or 244-254 degrees intake duration. Stock heads and stock valves only need about 220-230 degrees intake duration. Anything bigger will not flow any more air because of head flow limits. | ||
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