Horse power estimate?

[70sixpkrt]

What do you think this combo will make on horesepower:

440 bored .030=446
KB 237 pistons .003 deck height
Eagle 4340 H-beam rods
Comp is 10.25:1
Eddy heads 84cc with stage 1 and bowl blend
Straightline Cam 234/242@.050 540/525 solid with 112 lsa (4* built in) installed straight up
6-pack aluminum manifold with stock carbs.
forged crank .010 under
comp pro-magnum 1.5 rockers with 3/8 Smith Bros. pushrods
MSD 8546 dist.

[jg68]

What do you think this combo will make on horesepower:

440 bored .030=446
KB 237 pistons .003 deck height
Eagle 4340 H-beam rods
Comp is 10.25:1
Eddy heads 84cc with stage 1 and bowl blend
Straightline Cam 234/242@.050 540/525 solid with 112 lsa (4* built in) installed straight up
6-pack aluminum manifold with stock carbs.
forged crank .010 under
comp pro-magnum 1.5 rockers with 3/8 Smith Bros. pushrods
MSD 8546 dist.

I'll say with the eddy heads, around 550 HP, now this is just a guess

[firefighter3931]

What do you think this combo will make on horesepower:

440 bored .030=446
KB 237 pistons .003 deck height
Eagle 4340 H-beam rods
Comp is 10.25:1
Eddy heads 84cc with stage 1 and bowl blend
Straightline Cam 234/242@.050 540/525 solid with 112 lsa (4* built in) installed straight up
6-pack aluminum manifold with stock carbs.
forged crank .010 under
comp pro-magnum 1.5 rockers with 3/8 Smith Bros. pushrods
MSD 8546 dist.

I'll say with the eddy heads, around 550 HP, now this is just a guess

Probably closer to 500hp, inmo. 


Ron

[70sixpkrt]

Hi Ron. Rich called me last night and gave me some dyno numbers. I'm alittle disappointed with the numbers. I don't have the dyno sheet yet but he said it made 487hp/525tq. He did not give me the rpm numbers. He said there are a couple of variables why the hp is low.

1- The last couple of days it has been 90*+ here and that could hurt it.
2- His dyno machine is not set up for a 6-pack set up (he explained it but too long to type.)
3- It was brought up to 5900 rpm only because of an oil pan leak but the numbers were still climbing up.
4- this cam might be on the small size because of the way it was cut. I should of used the Comp 282S.
5- It is timed at 34*. At 36* timing the hp was going up but the torque was going down so he left it at 34*.
6- 6 pack manifold is restrictive.

He did like the torque though. I was expecting 500hp at least. Oh well. I'm going to pick it up next week and try to bring it to the track next month to see what it does.

[firefighter3931]

Thats about where i figured it would be Ricky.    Remember when we talked in Vegas about the 112* lsa grinds ?  The wider lobes flatten out the power band....it doesn't hit as hard in the sweet spot but it does come in sooner and hang on longer. 

I'll be interested to see what the dyno chart looks like. Personally, i wouldn't be disappointed at all with those numbers. The engine will idle very nice and make lots of manifold vacuum for your power brakes. The TQ number is excellent and your car is gonna launch HARD ! 

Cams are a compromise between power and drivability.....yours has a very good balance between both. 


The trick now is gonna be getting that badboy to hook at the track. You're making plenty of power for 11's once it's all dialed in.....it'll be an awesome running street car that will be very respectable at the track. 




Ron

[supserdave]

What do you guys think that a motor similar to that would gain with a roller cam? 40 hp?

[70sixpkrt]

I just got back from another pull and the torque went up to 531 and the hp went to 491. The numbers still wanted to climb. The reason why I went with a 112* lsa is because I did not want to hurt the street reliabilty with the 6 pack setup. I do however have 14 inches of vacuum.

[moparguy01]

Is this on a engine dyno or a chassis dyno?

[firefighter3931]

What do you guys think that a motor similar to that would gain with a roller cam? 40 hp?

Dave, a roller could pick up 40hp but probably not with the same .050 duration and LSA. To get more out of it the cam would need to be upsized and that would change the engine's behavior considerably. 

It's important to remember the intended application ; 3.54 gears and a manifold vacuum requirement for power brakes.



Ron

[firefighter3931]

Is this on a engine dyno or a chassis dyno?

Russ, the motor is on an engine dyno at Mopar Engines West ; an outstanding shop with a sterling reputation. 




Ron

[supserdave]

Either way, 525 lb ft is going to plenty to put a smile on your face!

[70sixpkrt]

I am very happy with 535 lb. ft. This motor is going to be pretty hard to hook at the track. I guess I should be happy with 491 hp. Ron I will post the dyno sheet when I get it. Thanks for your help. I did pull the power booster for the brakes off because I was not getting enough vacuum. Now I might put it back on.

[moparguy01]

Is this on a engine dyno or a chassis dyno?

Russ, the motor is on an engine dyno at Mopar Engines West ; an outstanding shop with a sterling reputation. 




Ron

Got ya. i figured it was a engine dyno but I've been wrong before. as rare as that might be....

[no318]

Those are CHASSIS #'S??!!!  I thought they were engine dyno #'s.  VERY impressive chassis #'s.

[moparguy01]

read above. he said it was on a engine dyno.

[Challenger340]

What's wrong with those numbers ?  Sounds like a VERY good engine, more than satisfactory to put a smile on anybodys face IMHO ! Outa drive like a champ too !

[70sixpkrt]

I was just expecting 500hp. I love the torque number. Ron, my old cam was the Hughes 3038 which is 230@.050 517/535 Hydraulic with a 110* lsa. Do you think my current cam will be more noticable? Will I feel more power? Do you think it is a step higher?

[firefighter3931]

I was just expecting 500hp. I love the torque number. Ron, my old cam was the Hughes 3038 which is 230@.050 517/535 Hydraulic with a 110* lsa. Do you think my current cam will be more noticable? Will I feel more power? Do you think it is a step higher?

Ricky....it's just a number, don't sweat it !  Trust me, you wouldn't be able to feel the difference between 491 & 500hp 

I Like solid cams...the valvetrain is more stable at higher rpms. I think this cam is an improvement over the Hughes grind....more lift to take advantage of the increased cylinder head flow as well as a more agressive lobe profile. You will notice a big difference, inmo. So will your back tires 


Ron

[70sixpkrt]

Thanks Ron!! You have been a big helping hand. I will let you know what happens at the track. I am trying to get it done for a Mopar car show and drag race next month.

[firefighter3931]

Cool.....get your self some sticky tires and have some fun ! I wouldn't be surprised to see your car pick up 10mph in the 1/4 ! 

Post those dyno #'s when you get a chance 



Ron

[Just 6T9 CHGR]

I think you're close enough to say "the engine is pushing 500 hp @ the crank" 

Sounds like a great combo there.  I would be very happy with those #'s

[70sixpkrt]

Ron here is a summary dyno sheet of all pulls. The 5th pull the hp was still climbing.

[Mefirst]

Nice looking power curve

/Tom

[firefighter3931]

Nice looking power curve

/Tom

That should be a blast to drive on the street !!!!   



Ricky, based on those results use 6k as your baseline for shift points when you take it to the track....pray for traction ! 




Ron

[440mag]

It would be nice to see how much difference it would make to take off the 6-pack and put on a Performer RPM and a 950 HP.  25 - 30 HP?

Sounds like a nice build.

[70sixpkrt]

It is a nice build. The six pack manifold is too restrictive. I think it would make a little more power with a good 4 barrel carb.

[firefighter3931]

It would be nice to see how much difference it would make to take off the 6-pack and put on a Performer RPM and a 950 HP.  25 - 30 HP?

Sounds like a nice build.

The RPM is a dual plane like the 6-pack so i doubt there would be that much difference between the two. The 6-pack carbs flow ~ 950cfm when measured at 1.5in like the 4bbl holley carbs so the total cfm available is close. The 6-pack intake is descent.....just not as good as most  single planes such as the Street Dominator, TM7 and Victor. Those will make more horsepower but will hurt the torque numbers below 3500. I saw this first hand when mine was on the dyno and we tested all of those manifolds....the dual plane lost 30hp on the top end but made 30ftlbs more tq below 3500. It's a trade off in power....TQ for HP.

I went with the Street Dominator for hood clearance and mostly because it was the best match for my custom cam profile, gearing (4.10's) and stall speed (4200) 

On a mostly street car with 3.54 gears a dual plane is the better choice, inmo....and 6-packs are cool ! 



Ron

[70sixpkrt]

Well Ron, here is my time slip from today. This is with BFG T/As. I could not get my buddies MT ET streets. I am really happy with the 13.01 mph. I am trying to get a slip with 12.99 or better with street tires. I am right there. It is really hard to go off the line with a 4-speed. It felt really good!

[firefighter3931]

Nice Ricky.....now the fun begins ! 

First off ; the MPH is descent and 108mph is good for low 12's once you get it to 60ft. Time to get a set of slicks or MT drag radials and get the short times sorted out. 

My buddy's Cuda 60's in the 1.58 range and has the same 1/8th mile mph (86) as yours and the car runs low 12's and has dipped into the high 11's.....your's should be pretty darn close once it's sorted out.  The 3.54's are hurting you a bit but that's what it is so you have to live with it.


So how do you like it ? There must be a noticable difference in power ?


Congrats on getting it together and making a few passes....it will only get better ! 




Ron

[70sixpkrt]

Ron I like it. I have noticed a big difference from my last set up. I one think I noticed is the torque. It pulls harder. I know I have to get some better tires. I know the 3:54 is hurting me but it is a street car and I love driving it on the freeway.

[firefighter3931]

Ron I like it. I have noticed a big difference from my last set up. I one think I noticed is the torque. It pulls harder. I know I have to get some better tires. I know the 3:54 is hurting me but it is a street car and I love driving it on the freeway.

Cool....i figured you'd notice a big difference. That's the E-heads and tight lash solid cam.....both help bigtime with Torque ! 

Street/strip cars are allways a compromise.....the 3.54's might cost you a few tenths in ET but you have to balance that with the overall drivability of the car and more importantly ; what you can live with on the hwy. 



Ron