How do NASCAR engines make 750+HP?
nascar secrets... The camshaft bearings diameter, looks like 3 1/2", the crankshaft bearings diameter looks like 1 3/4" diameter, looking at the heads the push rods are inside the head in what looks like it just fits in there, and off the top of the heads it sticks out about 1/4 inch, the intake ports are square and corners are rounded, and looks like 2" by 2", the blocks are steel the heads are aluminum, and the secretsy larger than an air craft carrier
Teching In
Joined: Oct 2010
Posts: 18
Likes: 0
From: California
True that racemman14.
I know this is a Chevy forum, but we got over 700 RWHP out of.....310 cubic inches using a small block Ford block. We used LBP, Lozano Brothers Porting out of Texas for our engines and they were, as you said, not all that expensive. Around $25k some ten years ago. Lots of details, but nothing really outrageous. 12.5 CR, 8500 redline. Think it's really more about using the right parts and processing them in the right way. I hear they are pushing well over 800 now with the new Trans Am rules.
That said, I am looking to build close to 600 with an LS3, stock bottom end and heads on 91. Looks doable and the engine goes to dyno next month...if I can get the sensor pin outs!
I need:
Cam
Crank
Oil Press
MAP
DBW TB
DBW Pedal
Anybody throw me a bone on those?
BTW- Here a pick of the LS3:
I know this is a Chevy forum, but we got over 700 RWHP out of.....310 cubic inches using a small block Ford block. We used LBP, Lozano Brothers Porting out of Texas for our engines and they were, as you said, not all that expensive. Around $25k some ten years ago. Lots of details, but nothing really outrageous. 12.5 CR, 8500 redline. Think it's really more about using the right parts and processing them in the right way. I hear they are pushing well over 800 now with the new Trans Am rules.
That said, I am looking to build close to 600 with an LS3, stock bottom end and heads on 91. Looks doable and the engine goes to dyno next month...if I can get the sensor pin outs!
I need:
Cam
Crank
Oil Press
MAP
DBW TB
DBW Pedal
Anybody throw me a bone on those?
BTW- Here a pick of the LS3:
Teching In
Joined: Sep 2007
Posts: 16
Likes: 0
Nascar 358 c.i. small block 1 4 barrel carb = 2.45 hp/ci and almost 10,000rpm
NHRA 500 c.i. Pro Stock big block 2 4 barrel carbs = 3.0 hp/ci and almost 11,000 rpm
Those pro stock engines are the most developed pushrod engine on the planet.
typical 4.700+ bore and 3.55 stroke
Nothing sounds cooler than 500 c.i. at 11,000 rpm going through a clutch and 5 gears
NHRA 500 c.i. Pro Stock big block 2 4 barrel carbs = 3.0 hp/ci and almost 11,000 rpm
Those pro stock engines are the most developed pushrod engine on the planet.
typical 4.700+ bore and 3.55 stroke
Nothing sounds cooler than 500 c.i. at 11,000 rpm going through a clutch and 5 gears
Cup engines run a flat tappet cam, i'd rather see them run roller cam. Nationwide/Trucks/sprint car run roller cam.
I'm sure cup cars would have more power with roller, so Nascar would probably choke the engines power down, with restrictor plates on all tracks, or something. If the cars just ran factory body panels they wouldn't be as fast, more power + less aero = better driver.
I'm sure cup cars would have more power with roller, so Nascar would probably choke the engines power down, with restrictor plates on all tracks, or something. If the cars just ran factory body panels they wouldn't be as fast, more power + less aero = better driver.
Another thing to consider is that NASCAR engines push the limits of the engines. I mean just look at how many guys blow engines during races. And generally the engines are trashed after every race, so the life of the engines are not great. That is a completely different goal then most of us because sure we want max power, but we also want them to last.
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I am sure there will be lots of changes as they move into fuel injection (next year I believe). This thread made me want to did into some of my old engine building books where they speced out some cup motors.
Cup engines run a flat tappet cam, i'd rather see them run roller cam. Nationwide/Trucks/sprint car run roller cam.
I'm sure cup cars would have more power with roller, so Nascar would probably choke the engines power down, with restrictor plates on all tracks, or something. If the cars just ran factory body panels they wouldn't be as fast, more power + less aero = better driver.
I'm sure cup cars would have more power with roller, so Nascar would probably choke the engines power down, with restrictor plates on all tracks, or something. If the cars just ran factory body panels they wouldn't be as fast, more power + less aero = better driver.
Nascar 358 c.i. small block 1 4 barrel carb = 2.45 hp/ci and almost 10,000rpm
NHRA 500 c.i. Pro Stock big block 2 4 barrel carbs = 3.0 hp/ci and almost 11,000 rpm
Those pro stock engines are the most developed pushrod engine on the planet.
typical 4.700+ bore and 3.55 stroke
Nothing sounds cooler than 500 c.i. at 11,000 rpm going through a clutch and 5 gears
NHRA 500 c.i. Pro Stock big block 2 4 barrel carbs = 3.0 hp/ci and almost 11,000 rpm
Those pro stock engines are the most developed pushrod engine on the planet.
typical 4.700+ bore and 3.55 stroke
Nothing sounds cooler than 500 c.i. at 11,000 rpm going through a clutch and 5 gears
TECH Addict
Joined: Aug 2004
Posts: 2,866
Likes: 4
There is no yet about it! they need all the time they can to get the fuel and air to mix. So the injectors are mounted ABOVE the inlet horns. Also if you every look at the intake track of an F1 engine you will see its totally straight to the valve. No bends at all!
Also note that F1 engines are RPM limited. give them another 2000rpm and the power figures will increase!
Chris.
Also note that F1 engines are RPM limited. give them another 2000rpm and the power figures will increase!
Chris.
There is no yet about it! they need all the time they can to get the fuel and air to mix. So the injectors are mounted ABOVE the inlet horns. Also if you every look at the intake track of an F1 engine you will see its totally straight to the valve. No bends at all!
Also note that F1 engines are RPM limited. give them another 2000rpm and the power figures will increase!
Chris.
Also note that F1 engines are RPM limited. give them another 2000rpm and the power figures will increase!
Chris.
