what do think H.P. and Torque????

[909duster]

Hi all,

I have the engine together and planning on having Westech do the dyno work, what do you think I should get in both H.P.and Torque. Here are a list of parts on the Motor.

360 short block .020 over bore
Ported Magnum R/T's w/ 1.97 SI intake valve 1.625 SI valve 265 cfm a .600
Edelbrock Magnum Air Gap
Speed Demon 750 w/air horn Double Pump.
Stock 1.6 rockers
Comp Cams Magnum 280 dur. .230@050 .512 gross lift w/1.6
Comp lifters
Speed Pro h116cp Piston .w/60 cc 10.5 to 1
Milodon windage tray and 8 quart pan
Msd dist. and 6al box HVC Coil Msd 8.5MM wires
Summit Billet Crank Damper made by Prodamper for a lot less money.
Trick Flow pushrods 7.650 in length
ARP bolts thru out.
TTi step headers 1-5/8 to 1-3/4

I'm guessing 420 to 430 Horse and hopefully the same in torque,
what do you think??

I post dyno #'s soon.

[Madman Stephan]

Just my 2 cents, but, I think you're about 100 over on both your guesses...

[Rust collector]

425hp/470tq, just to let you know...

[Dukes2fast]

I am definately a novice here and I am not trying to offer advice. But I would agree with Madman and guess it would be a little lower too. ....If the cam lift is .512 what does the head flow at .600 matter? Or is that just how head flow is normally rated? Again, I am just here to learn. I will be looking forward to that dyno sheet.

[tmef]

Very similar to a build I did a few years ago. You will end up will a little more cam than I had. I'll guess 355hp, 400 lb./ft. torque.

[benno318]

i tend to agree with your guess, the magnum heads teamed with the edelbrock air gap cannot be a bad combo at all. if youre talking engine dyno, then i would say easily over 400hp, probably closer to 430, at 55-6000 rpm and my guess at torque will be 400ish at a decent rpm due to your not over the top cam, possibly 38-4300 rpm? it is just my guess, but it will be fun to know the real figures when availiable, and even more fun for you to test the finished product on a "rear tyre durability test"! good luck

[dust]

Originally Posted by 909duster

Comp Cams Magnum 280 dur. .230@050 .512 gross lift w/1.6
I post dyno #'s soon.

Just curious, why did you go with 1.6?
Looking forward to the dyno #'s.

[LA360Dart]

Hi 909duster;

I believe that you might be slightly under guessing, my LA short block is very similar the heads are regular magnums, my engine is .030 over ( you didn't say if overbored ). My 73 Dart Sport340 runs 8.18 @ 85.5 in the 1/8th with me in it 3645 lbs and its making 340 hp at rear wheels to go that quick. My cam is 230 @ .050 .511 lift 1.6 rockers. Went to vegas at the strip and ran 13.297 @101.87 at 3500 ft which at sea level is 12.83 @ 105.6 (NHRA correction factor ) the engine in my dart makes close to 425hp at the crank. So Magnum RTs with their bigger ports 180cc (155cc for mine) runners should make closer to 450 hp at the crank. Torque from westech chassis dyno peaked at 430lbs at 3800 over 400lbs from 3500 to 4500 so your torque might even more and a little higher. Best of luck.


Denny

[ehostler]

So, we have two different people with close to the exact same build.

One person is getting 355hp at the crank.
One person is getting 425hp at the crank.

Hard to believe a 70hp variation for two differen builds that are very close to the same as the original post.

[FastEddie]

Similar engine dynoed in town a month ago 420 hp.

[George G. Leverette]

Originally Posted by ehostler

So, we have two different people with close to the exact same build.

One person is getting 355hp at the crank.
One person is getting 425hp at the crank.

Hard to believe a 70hp variation for two differen builds that are very close to the same as the original post.

Not that much a susprise, for some reason the Westech dyno is very generous in HP and TQ numbers. With three types of Dynos to measure performance it appears they are only indicators, are there any standards known to accurately produce performance numbers on a dyno?

[LA360Dart]

I was stating, the torque engine made on the chassis dyno, of 430 lbft of torque, the horsepower numbers are from weight of car and me vs the ET and mph from mopars at the strip to make it move that fast. thats why there are two sets of numbers sorry for confusion. If anything the westech dyno was stingy only showing 371 hp and 430 lbft at the crank 292 hp at rear wheels. also corrected a few items and made more power after being at westech so really need to get back and see what they show now ....

Denny

[tmef]

My build was KB pistons (don't remember the model number but compression ratio was slightly over 10:1), small valve 587 heads, Air Gap intake, Holley 650 DP with 1" spacer. The cam was an old Crower Baron that was I believe 230 degrees at .050. It made 342 hp at 419 lb./ft of torque. Not bad for stuff I had laying around.

[909duster]

DST,

I went with 1.6 because thats what a stock magnum uses for it rocker arms.

Madman Stephan,

I guessing these figures based on a previous 360 I had Dick Landy build for me back in 1994 360 9to1, swirl port heads, with street strip port work, MP purple cam w/.474 lift and stamp steel rockers. Now I don not have the dyno sheets(using my memory) any longer and the motor made 395 HP and 402 torque.I going up in compression and using a bigger cam and much better cylinder heads then the older swirl ports(308 casting).
Also if these parts look familiar they are almost the same as the Mopar Muscle build up with the 318 using the same cam and non-ported out of the box regular Magnums and a single plane intake, they made 400 HP with simple pieces as well.

I hoping for what I guessed at any more I'll be very pleased.

[benno318]

have you got some numbers for us yet?

[rellik eeb]

I would gues 400-425 hp with 25 less ft/lbs of torque.

[rumblefish360]

Hey 909, I thought you were doing a 318. You sure did support it.
I bet you turn those numbers with a good state of tune. Those heads flow well.
Speaking of which, what do they flow @ .500 lift? Since your only going that much and not to 600.

[Aspenj2002]

I'm going to say 443hp @ 5500 rpm and 436 @ 4300 rpm's

[909duster]

Rumblefish,

I guess I just cannot read or type I ment to write at 0.500 lift not a .600. for my flow number. Talkin with Comp they tell me that cam is over looked a lot because guys just read the "lift", and don't bother looking or reading past that. I chose that cam, because of its broad power band 2500-6500, and I feel with the AirGap intake which is similar in power band it should be a match.

The motor is close I have the cam in a 110 vs. 106 so I have to fix that. Once thats done putting the rest together is no problem then I can setup my dyno test. (Another big $$ deal)

[Steve Barracuda]

My 360 it a lot milder than yours and is 400 - 420HP . Tuned that has to be a 450HP + engine.