Gaz05

1.76hp per cube..thats out there .... My LS7 427, 4.125 x 4.00 LS7 heads(modified) GMPP manifold, 12.2 comp, 264/270 solid roller, and a 4500 Dominator on pump gas makes 706hp @ 7100rpm, only made 685hp with the smaller 4150 HP Ultra carb.

JL ws-6

iTrader: (50)

Cup car motor's are 358 CI and make 900 hp.... that's over 2.5 per ci. Granted they are spinnign 9800 rpm too.. but they do it.

2 per CI isn't as big a deal as it used to be... trying to get to 2.5 or more per CI seems to be the new hurdle with that.

Gaz05

They are not even close too 900, not a good comparison, I am talking about street engines here not the most developed v8 engines in the world.

Abuckeye

Check the winter issue of the engine master magazine. They make 670 at the crank from a 4.070 bore an 4.0 stroke on 91 pump gas

Gaz05

Thats more like it, 1.61 per cube.

Pwebbz28

iTrader: (31)

Guess the proof will be in the pudding when and if I ever find someone to tune it.

At the same chalenge a gen 3 417 hemi made 700hp with a hyd roller and ported stock heads. Thats with a 3.950 bore and a 4.25 stroke.

You win with average power not peak power at the challenge. Average power doesnt win you races though.

JL ws-6

iTrader: (50)

I just saw one on a dyno not too long ago... thing made 897... was a hendrix motor..... Dyno is considered stingy too. Thing was still making power up in the 9800 rpm range too when they shut it down....

They make more then you think.

dmracing

iTrader: (81)

Dude, you are dead wrong they make 900. They make 8?? restricted.

BES Stroked Nova

iTrader: (24)

I got a 418 LQ9 based setup. All pro hurricane heads that were ported to a 240cc runner, 13.0 to 1. solid roller 270's range(bracket style, no killer lobes) super victor, 4150 TB. Made 7xx in the upper 7k range. and it was dynoed with pacesetter headers(fits their dyno, my kooks didnt) no vacuum pump, no carb spacer. It will have a vacuum pump, 4 vane style, 4500 TB, 2" kooks,2" HVH spacer. I'd say it should pick up a few. Then its going to get a 250 hit.

My stock short block 6.0L(arp rod bolts) with L92's(street port job) made right at 600 on the same dyno, 242/246 cam, GMPP single plane, ultra low profile elbow. on pump gas. 10.85 to 1 comp. it made power all the way to 7900, with a peak at 7300-7500.

I'd say a stroker l92 on pump gas with a bigger camshaft and a single plane should be a easy 650-670hp. and take a good hit of spray.

and who won 2010 engine masters challange is the same people who build my engines. cant say their name cause they haven't became a sponser..........

JL ws-6

iTrader: (50)

You can say the name, just can't give out contact info

hymey

The cup engines make 800-830 derestricted through a 4150 with no plate, we see a lot of 700 hp engines dynoed from the states that make less then 600 here, must be the dyno calcs. Same as chassis dyno's your chassis dynos read our flywheel hp in most cases. 2hp per cube is a big deal for the avg builder. If 2 hp per cube engines were that easy....EMC engines would be all making 700 hp for 350 ci and 440 footpound at 3000 rpm. Even with the 7000rpm limit, they werent doing it. They can do it with 430 ci. This is with cams only good for x amount of pulls plus hammer valve springs with super fast ramps and 850 lift. To make a real 2 hp per cube you have to spin an engine real hard. Pump gas LS7 headed or LS3 headed engines with the best port design you are looking 1.7 hp per cube tops. If they raised the limit to 7500 rpm at EMC which is all hydro cams are reliably good, Even with solid rollers they would be pushing **** up hill to get there. And even before someone replies with "but they go for avg power" yes they do but 99% of engines with a 7000 rpm limit make great avg power! For 2 hp per cube race gas etc..And the bigger the engine harder it is to make the power from frictional losses.

.......

racer7088

Yes hp is way different than hp per inch. Hp per inch is dumb to look at unless you are limited in inches and don't mind turning it way up there. HP per inch simply equals rpm like Hymey is saying above which is true. I only care about hp so I run larger engines and can make what I want under 7500 rpm. It's just physics.

racer7088

BES did make 700 hp with a 417 on pump gas with their small bore hemi and that was a bad *** engine. They could no doubt make more with totally unlimited rules on manifolds etc. EMC has several weird rules and is not an example of what you can really do all out on pump gas. You can do more but they are way up there even with the current restrictive rules.

kelp

707 FWHP LS7 here. N/A on 93 octane. Be prepared for a lot of custom work and learn how to tune to optimize it.

SSCamaro99_3

iTrader: (1)

I bet those things are a lot of fun to stand on down those 3000 ft straights.

Are they using real big bore/short stroke combos. I had read some things that saifd they did, but information is often sketchy and hard to find.

I wonder what they could do under some of the old rules when 18:1 compression was normal.

Restricted motors are in the low to middle 400's.