Che70velle

iTrader: (6)

I figured the very same thing. Anybody know what they are doing? I’ve seen some 1000 hp LS dirt engines, with inline valve heads, but they are far, far from streetable. It’s getting to where you need 1100+ hp to run up front at the top paying dirt events.

Smokey B

No worries kcs... got a known winner and team. Spoken to the guys at Baldwin before.... aka Flyin 418. 275 to mid 280' on intake duration with a tight lsa as stated. Or something similar. or it Could be a 265 duration cam with 800+ lift.

Smokey B

Chris is stomping the competition is the real Truth. The other bs is irrelevant.

G Atsma

Don't hold your breath.....

Smokey B

Funny thing is if a person knows.... there's a 440 build that made 926 hp here on this site. People with high dollar budgets and super smart tend over complicate the simplest things to post #19.

Compression is anywhere from 14.1 to 15.1 generally with the class spoken on. About that of the 440 here with 14.5 compression if I'm not mistaken.

KCS

iTrader: (20)

It's not the HP that's in question, it's the torque. That kind of torque per cubic inch is rare. To do it with a wet sump engine and a cast single 4 barrel intake is like spotting a unicorn.

Smokey B

I understood what you said and mean. Think about dwill's 408? Tight lsa and 278 duration cam 7500 peak and for a 408 a great deal of tq(stated on a another type of Dyno 820 would read around 860fwhp with a 408 mind u @ 7500) Chris heads are just getting the air and fuel there better thru out the rpm band. Now don't get me wrong...**** gets inflated all the time. But I don't think this is the case. Dubbz 434 made 830 hp and also built by the same people. They're just cranking it up with air and lift with compression. Just a short rpm window.

Smokey B

BTW dry dump isn't really helping anything @ 7500. A good GZ vacuum pump would get about the same results?


For the slow.... that don't get it. Same engine just use a tighter LSA.

Keep up, it's to simple
https://ls1tech.com/forums/dynamometer-results-comparisons/1322891-926hp-engine-dyno-na.html

Smokey B

Back to the real subject.

Chris Frank is shitting on the competition as a 1 man wrecking crew.

I need to call my buddy.

KCS that's what the Rowdy heads are for > dwill copy cat = higher compression and higher lifts. Just e85 not Alcohol or race gas He used Mast I used Darin.

We just putting **** into a hole and igniting it.
The more we put in the bigger the bang no matter the rpm?

KCS I have a question for u? What's the biggest LOBE u think you could get with the .250 crank. Would like to know for reference. Ideas!

KCS

iTrader: (20)

Theres a limit though. You’re not going to make 950hp at 1000rpm with only 100ci. You can calculate the BMEP to see what’s realistic.

As far as the lobe, it really depends on the rods. The first set I tried barely cleared my standard base circle cam with a .372” lobe. The second set I tried had a lot more clearance. I think a .400” lobe could fit even with a standard base circle, but a small base circle would open up your options a lot better. I’m not sure how much duration would affect things, it seemed like the tighest clearance was at the max lobe lift.

62nalide

iTrader: (2)

Compression is 14.0:1, Those F-Series have been producing some great torque numbers. NA Blower cars and Nitrous.
CTSV with their F310s gained 66whp 118whp, NA SBE LS7s have seen 48whp 67wtq and now Bladwin saw the same results.

62nalide

iTrader: (2)

14.0:1CR and solid roller cam. Spec's are not given unless you buy their $895 camshaft.

WE TODD DID

iTrader: (2)

There isn't a gasoline, naturally aspirated engine on the planet that produces that kind of torque efficiency. Including those.

Smokey B

Thanks.... thought is biggest LOBE that could be done @ the highest compression available to 7200. Too many engines that can be done, read about a Nissan 5.6 v8 making 1000 on the bottle. Lol. Posted on YB about a gen3 hemi thought I ran by Zack birdman gen3 hemi turbo clone. Ideas when bored, city to city.

On measuring hp or tq by bmep....never used it but know that's what professionals use to calculate hp......

I use the old Dyno and cam, compression, intake, method. Or my simulation program .....

Smokey B

Well my Teacher has spoken....
KCS your were correct. Makes me also wonder........

KCS

iTrader: (20)

BMEP = 150.8 x Torque / Cubic Inches

Any given fuel will only tolerate a certain amount of cylinder pressure before detonation or preignition happens. That’s why you won’t see a 100ci engine make 950hp at 1000rpm on gasoline. The fuel itself will not tolerate the cylinder pressure required to achieve that much torque. BMEP is not actual cylinder pressure; it’s theoretical, but it can help you see trends in what is possible and help keep your expectations in check. It’s basically torque per cubic inch.

KCS

iTrader: (20)

I didn’t want to say it was impossible, but you may know better than me.

Double06

I think one of the reason these heads do well is the exhaust port they have seemed to have straighten out. Their site shows they flow great and that is with a SF1020 flow bench which is about 3%-5% more conservative than the standard SF600. I always thought the exhaust port was weak given how well the intake flows. With a 1.6 inch or so exhaust valve you can only do so much and at some point you got to get the stuff out of there. .

spanks13

iTrader: (5)

The power figures may be elevated, but the gains between combinations are still evident.

Smokey B

Hey ....if it's incorrect it's incorrect. KCS really don't have the time to calculate it..but if Eric said it in him I trust.

Chris heads as I've said have the best features of any ls7. Compare them to anything available. I did and on paper they do seem to be the best thang out here.