Going to the Dyno in the AM...Guess the HP

Posted By: A70Runner

Going to the Dyno in the AM...Guess the HP - 04/10/12 09:58 PM

Going to dyno my 496 tommrow. I am so exited!!! Just wondering what everyone thinks it will make for tq/HP

Specs
496 Using Muscle Motors kit. Should be little north of 10-1 Compression
Edelbrock head CNC ported by Modern Cylinder heads. Flow 328int/268ex.
Solid Roller cam by Straighline
w 1.5 rockers.
Intake .645 Duration 300 Centerline@108
Ex. .626 Duration 314 Centerline @116

Intake is a ported Holley SD to clear my hood on my RR. Also going to try a M1 on the dyno
950 Demon for a carb.

Posted By: johnnycuda

Re: Going to the Dyno in the AM...Guess the HP - 04/10/12 10:47 PM

I'm assuming SD stands for Strip Dominator,I'll guess between 610-650 hp range,,what headers are being used?,,2inch primaries?

Posted By: dmking

Re: Going to the Dyno in the AM...Guess the HP - 04/10/12 11:17 PM

622hp corrected

Posted By: Old School

Re: Going to the Dyno in the AM...Guess the HP - 04/10/12 11:58 PM

620 hp 640 tq

Posted By: JCCuda

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 12:15 AM

Hey Jim good luck tomorrow. I wanted to go with Todd but couldn't get off from work. Any normal 496 like yours would probably make about 600 hp but with the Hoven brothers working on it I'll have to say 685 hp and 575 ft.lbs.

Posted By: jim sciortino

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 12:55 AM

690....

Posted By: 383man

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 04:31 AM

I was thinking about 625. Ron

Posted By: Mr.Yuck

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 12:22 PM

I'd be shocked if it doesn't make 650+

Posted By: Clanton

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 12:28 PM

Quote:

I'd be shocked if it doesn't make 650+

prepare yourself then,i think 580/600hp but if it was on alky i would be there with you.

Posted By: gregsdart

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 12:35 PM

Good luck with it! For sure it will put a smile on your face when you get it in the car!

Posted By: jim sciortino

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 01:30 PM

In the early 90s we had a 499ci with a set of 906s that my brother ported, an M1 /with a 9375 1050, a solid lifter cam and 2" fenderwells.

On it's 1st outing at ATCO, in ran a string of 10ohs at 135 change. The car had SS prings, footbraked and weighed 3380.

We never dynoed that one because it was just a lowbuck streetcar. Your engine has to make more than that thing did.

Posted By: Mr.Yuck

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 01:34 PM

Quote:

Quote:

I'd be shocked if it doesn't make 650+

prepare yourself then,i think 580/600hp but if it was on alky i would be there with you.

I've never been to the dyno, but I'm guessing I'm around 570ish and he has WAY more engine than I have...and 50 more cubic inches.

Posted By: Cab_Burge

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 03:13 PM

Quote:

Going to dyno my 496 tommrow. I am so exited!!! Just wondering what everyone thinks it will make for tq/HP

Specs
496 Using Muscle Motors kit. Should be little north of 10-1 Compression
Edelbrock head CNC ported by Modern Cylinder heads. Flow 328int/268ex.
Solid Roller cam by Straighline
w 1.5 rockers.
Intake .645 Duration 300 [Email]Centerline@108[/Email]
Ex. .626 Duration 314 Centerline @116

Intake is a ported Holley SD to clear my hood on my RR. Also going to try a M1 on the dyno
950 Demon for a carb.

The cam looks like a blower or NOS cam so my guess testing it N/A will be around 650, maybe as high as 675 HP and 610 to 630 Ft Lbs

My 505 with Jeffs CNC RPM heads made 687 HP at 5900 RPM with a 1050 Dominator on a M1 and 1.0 inch open phenolic spacer with a lot smaller roller cam

Good luck

Posted By: Streetwize

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 03:17 PM

Roller lift/duration is well matched to the Modern CNC eddies. If the SD is ported like I do them that motor should EASILY make at least 635-640 Hp and either way it's gonna be a near perfect street/strip brawler, perfect for 3.54 gears. Out of the box a SD will flow around 270, ported they can go over 310.

Very similar to my old 508 which was a 610hp recipie with a 252/258 straight line hydraulic roller and ported iron Stage V heads. Either way, I like the combo a lot but I'd prefer (having run both) the tighter 108 lobe spread for a little more "hit" in the 2500-4500 'fun zone'.

Nice combo....I predict.... happiness

Posted By: MR_P_BODY

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 03:43 PM

Scott really likes to run 112 lsa cams... I have one
of his cams also and its a 112 lsa

Posted By: deaks

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 03:53 PM

Based on my setup, mine yours
440 496
solid .590 roller .640
comp 12.7.1 10.5.1
intake victor SD
carb 950 950
heads MCH RPM's on both
mine approx 600 hp yours 630 hp

Posted By: Mr.Yuck

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 04:07 PM

Quote:

Based on my setup, mine yours
440 496
solid .590 roller .640
comp 12.7.1 10.5.1
intake victor SD
carb 950 950
heads MCH RPM's on both
mine approx 600 hp yours 630 hp

how can you say a guy that has 56 more cubic inches is only going to make 30 more hp?

Posted By: dogdays

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 05:46 PM

Horsepower is limited by airflow when the engine gets big enough.
R.

Posted By: A70Runner

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 05:52 PM

610@5700 and climbing before rocker shaft problems ended the day.

Posted By: RAMM

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 06:05 PM

What was the nature of the problem? What was the torque looking like? J.Rob

Posted By: Brian Hafliger

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 08:24 PM

Quote:

Quote:

Based on my setup, mine yours
440 496
solid .590 roller .640
comp 12.7.1 10.5.1
intake victor SD
carb 950 950
heads MCH RPM's on both
mine approx 600 hp yours 630 hp

how can you say a guy that has 56 more cubic inches is only going to make 30 more hp?

2pts. compression is part of it...

Posted By: Clanton

Re: Going to the Dyno in the AM...Guess the HP - 04/11/12 08:27 PM

Quote:

[Email]610@5700[/Email] and climbing before rocker shaft problems ended the day.

i think the engine gains 10hp per 100 more rpm on the dyno +/- to what the cam,carb,heads will allow.

Posted By: A70Runner

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 03:20 PM

Quote:

What was the nature of the problem? What was the torque looking like? J.Rob

Seized the rockers to the shafts. tq 598@4900

Posted By: Clanton

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 03:26 PM

Quote:

Quote:

What was the nature of the problem? What was the torque looking like? J.Rob

Seized the rockers to the shafts. tq [Email]598@4900[/Email]

ouch.

Posted By: Mr.Yuck

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 03:35 PM

Quote:

Quote:

What was the nature of the problem? What was the torque looking like? J.Rob

Seized the rockers to the shafts. tq [Email]598@4900[/Email]

how does that happen? lack of oil? I would think they'd make a bunch on noise before they siezed up...

Posted By: HardcoreB

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 03:44 PM

Sorry about your luck... I have some new rockers for sale in classifieds.

Posted By: JohnRR

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 03:49 PM

Quote:

Quote:

Quote:

What was the nature of the problem? What was the torque looking like? J.Rob

Seized the rockers to the shafts. tq [Email]598@4900[/Email]

how does that happen? lack of oil? I would think they'd make a bunch on noise before they siezed up...

Possible the springs are too stiff for those rockers ?

Have you ever dynoed and engine or been present for one ? You aren't in the room with the engine, headers are usually open, there is a lot of noise .

Posted By: Mr.Yuck

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 04:09 PM

Quote:

Quote:

Quote:

Quote:

What was the nature of the problem? What was the torque looking like? J.Rob

Seized the rockers to the shafts. tq [Email]598@4900[/Email]

how does that happen? lack of oil? I would think they'd make a bunch on noise before they siezed up...

In his case using rockers rated below the spring pressure.

Have you ever dynoed and engine or been present for one ? YOu aren't in the room with the engine , headers are usually open , there is a lot of noise .

just chassis dyno.

Posted By: A70Runner

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 04:10 PM

Just talked to Comp. They said those rockers should be fine with my spring pressures.(or at least the new design ones.)

Posted By: JohnRR

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 04:27 PM

Quote:

Just talked to Comp. They said those rockers should be fine with my spring pressures.(or at least the new design ones.)

I thought this came up before and that 500 was the number ?? Are yours considered the new design ?

Mods to your rocker oiling ???

Are they going to warranty them ?

Posted By: forphorty

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 10:04 PM

Are these the Comp Pro Magnums? Seems like a few people were having those rockers bushed due to the steel-against- steel galling..... Never mind, i see you have started another post.

Posted By: dmking

Re: Going to the Dyno in the AM...Guess the HP - 04/12/12 10:34 PM

my 440 made 590ftlb at 4800 but stopped at 605 at 5800

cam at 104 solid. now at 108 and it picked up a strong >4 to .5 in the 1/4.
i may put it in at 110 this season.....

Posted By: A70Runner

Re: Going to the Dyno in the AM...Guess the HP - 07/22/12 08:12 PM

Ok finally got back to the dyno. Same combination execept Harlond Sharp rockers......

657.5 hp @ 6100
638.6 tq @ 4800

on Sunoco 93!!

Video of pull

Tried a M1 with 1" spacer on it also....
ran 1 hp under the sd. The sd had a more straight curve to it. the m1 was very choppy. Sorry can't find the sheet right now for the M1 so no exact numbers.

All in all made 16 pulls yesterday. Only "scare" was losing 50hp on the first run with the M1. found a piece of bowl gasket in the front jet. No harm no foul!!

Very Happy!!!

Posted By: Von

Re: Going to the Dyno in the AM...Guess the HP - 07/22/12 09:02 PM

Nice numbers.

Wondering what your .050 duration numbers are on the cam?

Posted By: JCCuda

Re: Going to the Dyno in the AM...Guess the HP - 07/23/12 05:16 PM

Hey Jim congrats on finally get that thing running on the dyno. Made some good numbers Todd and Duane were keeping me posted. I unfortunately was working in an attic (the exciting life of an HVAC guy) in Toms River while you guys were having fun. I couldn't believe that the M1 wasn't a little better than the SD. Now hurry up and get it in the car and see what it does. I'm saying 10.50 at 127-128. Good luck. And tell us what the @.050 numbers are and the lobe seperation.

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