This does not have anything to do with our f-bodies and I do not know much about advanced tech. But, if someone could explain to me how winston cup cars make the power they do in an advanced tech type of way that would be cool. I've seen the engines in person, and they look pretty sweet, but can't grasp how they make the power they do. If this is in the wrong section I apologize but I'd like know more about these engines. Most of you guys know a [lot] about cars so I thought I'd post this in here. Again, I apologize if this is in the wrong section.

Thanks,

Jeff

 

I think the compression they run and the fact that they run it on SB2 parts has a lot to do about it.

 

A 358 inch cup style engine is around a 4.120 bore and a 3.34 stroke with a 6.0 to 6.200 rod length. The Sb2.2 heads flow around 370 to 380 cfm at .700 lift (at least the best one's I've seen that still make a good torque curve and that they are willing to part with). We use the same engine in dirt late models and a 358 sb2.2 will make 775hp. We don't run the vacumn in the crankcase because of the high dirt enviroment, which loses approx. 20 to 35 hp. The engines need to spin 9200 to 9300 rpm.
We can use roller cams where they are required to use a flat tappet, but they use welded core cams and are pretty agressive on ramp speeds. They only use the engine for 500 miles where we run them for 1000 to 1400 laps mainly to replace valve springs and lifters. Most are using honda size rods in the 560 grams range and 32 to 38 pound billet crankshafts. (carillo w/ carr bolts being the rod of chioce). They are limited to 12 to 1 where we run 15 to 1 compression.
A friend of mine runs the dyno for a multi-team wiston cup team and I know what they are making for power but you will here a varity of hp numbers from people but they are around the 800 hp mark.
One note a cup set of sb2.2 on a 420 will make an easy 880 hp with out trying to hard.

 

Taylormade: Just curious, is it possible to build a "streetable" motor using WC SBC 2.2 parts? By streetable I mean something you could drive to work everyday if need be.

I figure they probably have ungodly large ports for a street motor but with enough CID it might not be a problem.

Thanks!

 

Non restrictor plate sb2.2 heads are around 282 to 288 cc intake runners. This is a little deceiving because the port is longer than a 23 or 18 degree head so a 286 cc sb2.2 is compairable to a 254 cc 18 degree head. I don't see why you couldn't build a street one as long as It was pretty large a displacement. Not all sb2.2 engines need to turn over 9000 rpm just the small ones, a 415 to 420 only needs 8000 rpm to be effectives. The sb2.2 heads will make alot more power than a 18 degree engine. A good 358 cup style engine with 18 * will make around 720 to 730 but a sb2.2 will do 775 with the same torque curve.

 

Thank you sir!

A motor like that would be waaaay beyond what my budget allows but its always fun to play "what if".


Thanks again,
Jason

 

Remember our M.I.A. comrade Riddeck?

sb2 headed 434... 700hp NA on pumpgas

Lots of neato tech in nascar.. Spintron = goodness

 

Yup, I keep hoping he'll show up again but it looks to be a lost cause

I thought he was running 18degree heads on his 434? Not that it matters, its a bad *ss motor either way

 

Actually a sb2.2 isn't really anymore expensive then say a 18 degree engine. You can get a set of one race old heads for around 4500.00. This includes assembled heads(titanuim valves and retainers, some of the best cnc port work available, springs, seat cups, and locks) , matching ported 2 pc intake, jesel or TD shaft rockers, oiler valve covers, and other top end parts. If you buy a new set of nice heads you can spend that much by the time you buy an intake have it ported, get rockers, studs and girdle, and valve covers. The real expense is the custom pistons and headers. But pistons aren't that much more that std stuff. I'd recommend custom pistons for any serious engine. A guy could biuld one for around 10,000 to 12,000 with all aftermarket parts if he did his homework and found some good used parts like block.

I built a spare 404 for my personal car with a rocket block, Carrillo rods, Bryant billet crank, new customs pistons and pins, and a set of dyno time only cup heads and I 'd say I have about 12,000 in it with the rest of the parts all new.

I've built 23 degree stuff that cost a whole lot more than that!