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      01-28-2012, 05:53 PM   #21
mapezzul
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Quote:
Originally Posted by 03BeastCharmer View Post
As they were working on the 94 just a little while ago, did anyone notice that plenum cover was from an S62 M5 V8 engine instead of the E9x M engine. I know that the prototype and GT's had been using the old M5 engine, but I thought at the end of last year they had finally made the transition. Happy to see that the S62 is still doing well in racing.

Edit: I see in the post above that it is indeed the S62 engine. Why is it preferred engine? I know in stock format, it's a more torquey engine, but it's also an engine from a decade ago.
It is because they have not changed the rules to allow the newer engine.... owned by NASCAR!

Here are the engines allowed in DP:

DAYTONA PROTOTYPES ENGINE ELIGIBILITY AND APPROVAL LIST as of 12/6/11
The following engines have been approved for competition in Daytona Prototypes.

BMW S62-B50 32 valve 5.0L V-8
Bore: 3.701′′ Stroke: 3.502′′ Minimum crank weight: 40 lbs Maximum compression ratio: 11:1 Cylinder heads and intake cannot be ported. Intake valve: 1.377′′ Exhaust valve: 1.200′′ Piston, rings, pin and connecting rod: 936 gm minimum Maximum camshaft lift @ retainer with zero lash: .500′′ Maximum cam duration: 260 ° @ .050′′ lift Induction: 8 individual butterflies @ 1.965′′ Must use OEM intake manifold. Air intake to be sealed to 11 x 9 9/16 hole in top of OE intake manifold. Must use approved air box. Cam profile on file cannot be changed RPM limit: 6800 Maximum fuel pressure 5 bar (72.5 psi)

CHEVROLET* 5.0L V8
*Can also be branded as Cadillac. Engine block Casting # 12598723 or 12621766 with specified bore: 3.900′′ Stroke: 3.185′′ Minimum crank weight: 38 lb Maximum compression ratio: 11.5:1 Cylinder heads part # 17802752. Intake and exhaust ports cannot be modified. Cylinder head intake runner maximum volume: 230 cc’s Cylinder head exhaust runner maximum volume: 87 cc’s Intake valve: 2.100′′ Exhaust valve: 1.550′′ Piston w/rings, pin and connecting rod: 1000 gm minimum. May use titanium wrist pin. Maximum camshaft lift @ retainer with zero lash: .590′′. Maximum cam duration: 248°/251° @.050′′ lift. Must use with no modifications. Maximum RPM: 6900 Maximum fuel pressure 5 bar ( 72.5 psi)
Part # K-GMDPAA Intake Manifold, w/ 2.0 inch I.R. Kinsler Throttle Bodies. Inlet trumpets and air box as submitted and approved. Air box base Part # 17802737

FERRARI 4.5L V8
Bore: 3.70” Stroke: 3.185” Minimum crank weight 36.2 lbs. Maximum compression ratio:12.8:1. Cylinder heads and intake cannot be ported. Cylinder head intake port volume: 75.4cc. Cylinder head exhaust port volume: 142cc. Intake valve: 1.486”. Exhaust valve: 1.215”. Piston, rings, pin and connecting rod: 920 gm. Minimum. Maximum camshaft lift at retainer with zero lash: .520”. Maximum cam duration: 225oin/216oex @.050” lift. Induction: two throttle bodies @ 82mm. RPM limit: 8200. Maximum fuel pressure 5 bar ( 72.5 psi)

FORD 5.0L V8
Bore: 3.705′′ Stroke: 3.543′′ Minimum crank weight: 38 lbs, Maximum compression ratio: 11:1 OEM GT40 cylinder head with production intake ports. . Maximum intake runner volume: 251cc, maximum exhaust runner volume: 115 cc Intake valve: 1.496′′ Exhaust valve: 1.260′′ Piston, rings, pin and connecting rod: 1000 gm minimum Maximum camshaft lift @ retainer with zero lash: .498′′ Maximum cam duration: 254° @ .050′′ lift. Cam profile on file cannot be changed. Intake Manifold Part# RYE-70686A. Inlet trumpets and air box as submitted and approved. RPM limit: 7000 Maximum fuel pressure 5.0 bar ( 72.5 psi).

PORSCHE 3.99L GT3R Flat 6
Up to 3.99 liter displacement. Engine to Transaxle adaptor with 24/25 or 24/23 (Xtrac only) drop gear ratio permitted allowed approved supplier TBA. Maximum RPM: 9400. Maximum fuel pressure 5.2 bar (75.4 psi) Cars electing to use this engine must weigh 2275 lbs. Six speed transaxle is permitted.

CAYENNE based 5.0L V8
( by Lozano Bros. Porting)
Cylinder Bore: 3.701 Stroke 3.543 ,Minimum crank weight :38 lbs. Maximum compression ratio: 11:1. Cylinder head intake runner volume 156 cc’s. Cylinder head exhaust runner volume: 121 cc’s. Intake valve:1.464.Exhaust valve: 1.282.Piston w/rings, pin and connecting rod 1000gm minimum. Maximum cam duration 260°@.050 lift .Maximum cam lift w /zero lash: 500. Intake Manifold Part # K-HRDPMAN, w/ 2.1875 inch I.R. Kinsler Throttle Bodies. Inlet trumpets and air box as submitted and approved. (Lozano Bros.) RPM limit 7100. Maximum fuel pressure 5 bar (72.5 psi).
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