|
Re: 612 Predator Dyno Results
[Re: PETE@BESTMACHINE]
#1216284
04/18/12 01:58 AM
04/18/12 01:58 AM
|
Joined: Jan 2003
Posts: 19,543
Las Vegas
Al_Alguire
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 19,543
Las Vegas
|
I am kinda anxious to see some more ET numbers from cars that have Predators. I have an oppourtunity to pick one up and am a litttle on the fence due to lack of real world in car numbers.
Pete your bullet sure made nice power. I also find the debunking of another myth interesting.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
|
|
|
Re: 612 Predator Dyno Results
[Re: PETE@BESTMACHINE]
#1216285
04/18/12 10:02 AM
04/18/12 10:02 AM
|
Joined: Jan 2003
Posts: 995
Boynton Beach, Fl
Rapid588
super stock
|
super stock
Joined: Jan 2003
Posts: 995
Boynton Beach, Fl
|
Pete, according to my calculations on an alum Indy block i have, and a spare steel Indy sleeve i had laying around, i come up with a measurement of around .057 or so for sleeve thickness with a .030 overbore (plus piston clearance). Do you feel that wall thickness is adequate, and bore distortion is not a hinderance, noting it is solid aluminum bore encased sleeve? The dyno #'s posted sure point out no problems to that effect  What do you attribute the better dyno numbers over the iron block from, less heat in the cylinders (desirable) or the different ring package? By the way, killer engine combination Randy
93 Dodge Stealth - Supercharged 526ci Hemi
93 Dodge Daytona Top Sportsman injected 588 Hemi - plus a lil NOS
67 Hemi GTX (may the 4speed with you!)
|
|
|
Re: 612 Predator Dyno Results
[Re: moderncylinder]
#1216286
04/18/12 11:03 AM
04/18/12 11:03 AM
|
Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing
master
|
master
Joined: Mar 2007
Posts: 3,300
Northern Indiana
|
Quote:
am i actually correct in figuring back,, to see fuel numbers to say that at 6000 the engine used more fuel than at 7500?? by just a few lbs though,, at 6000 it peaked, then went down, and came back up to about that number at the end of the pull..
thats alot of power for those parts
If you are figuring fuel usage off of the BSFC numbers,the BSFC is usually most efficient at the torque peak (lower numbers)and the numbers pick back up as the rpm's rise. I have found that the way MOST dynos measure BSFC,that the readings lag behind the rpm shown on the dyno by a few hundred rpm.
They usually measure the fuel flow before the regulator and the fuel usage can't take into account how much fuel is in the bowls.
The A/F readings using the measured fuel flow and measured air flow into the engine that I used in the past are unreliable in most cases.These meters need constant recalibrating and still are only an indicator.
By the way,Pete,great couple of builds you have posted on here lately!!
Keith
|
|
|
Re: 612 Predator Dyno Results
[Re: Dunnuck Racing]
#1216287
04/18/12 12:51 PM
04/18/12 12:51 PM
|
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
Biginchmopar
pro stock
|
pro stock
Joined: Nov 2010
Posts: 1,397
Carson City, Nevada
|
Thanks Pete! When I get this one together I will post some numbers, then I'll see if it will make the car scoot the way it should. First I need to see if the car will run the number for B/gas with the BS headed 498. 
|
|
|
Re: 612 Predator Dyno Results
[Re: Dan Brewer]
#1216289
07/10/12 08:44 AM
07/10/12 08:44 AM
|
Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
Dragula
I Live Here
|
I Live Here
Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
|
Quote:
So far this combo has been 7.42 @ 187. 2375# in 95' heat. Still working on chassis and in car engine tune.
How has the maintance between runs been? I am curious because the Predators are the next step up from a Hemi, and they fit a hemi block, and every once in a while a set comes up for sale at a good price.
|
|
|
Re: 612 Predator Dyno Results
[Re: PETE@BESTMACHINE]
#1216290
07/10/12 09:48 AM
07/10/12 09:48 AM
|
Joined: Apr 2007
Posts: 2,028
Trumbull,CT.
jim sciortino
top fuel
|
top fuel
Joined: Apr 2007
Posts: 2,028
Trumbull,CT.
|
Quote:
The most interesting part of this is that we redid the engine the frist time reusing the customers old mega block. The block cracked a cylinder during the dyno session. Yes we sonic tested the block and was thick enough for the 4.530 bore that was used. All we did was replace the block with a Indy Aluminum block. It pulled more crank vac and made more HP than the iron block before it broke. We have a different ring combo for aluminum block we use every thing else was the same. So much for making less power with aluminum over iron blocks. This engine has the std cam core size and is not a rasied cam block. 4.750 crank, Crower steel rods, CP pistons, Predator CNC ported heads 1.8 rockers, our custom cam and Pro Systems carbs. If we did one like this again we would use a 55MM cam core, some extra porting and a better intake with Q-16 fuel. We used C-16 Fuel for this build.
I've always wondered about the power difference in block materials and how much is actually caused by improper honing. Maybe this is where some of the issues come from when trying to seal up an aluminum block.
If a sleeve in an aluminum block is harder than the wall of an iron block, the honing deal must be adjusted to prevent the ring from hydroplaning, causing loss of seal due to not enough oil on the wall because of shallow hone valleys.
On the other hand, too much oil in the hone valley requires too much ring tension.....also costing power.
As rpm increases, I feel the losses would become more pronounced.
|
|
|
Re: 612 Predator Dyno Results
[Re: Dragula]
#1216291
07/10/12 10:00 AM
07/10/12 10:00 AM
|
Joined: Mar 2008
Posts: 768
Ohio
Dan Brewer
super stock
|
super stock
Joined: Mar 2008
Posts: 768
Ohio
|
Quote:
Quote:
So far this combo has been 7.42 @ 187. 2375# in 95' heat. Still working on chassis and in car engine tune.
How has the maintance between runs been? I am curious because the Predators are the next step up from a Hemi, and they fit a hemi block, and every once in a while a set comes up for sale at a good price.
We have run pushrod oiling and these heads for about 4 years. Run the valves and check oil filter every 5-10 runs just because. They do not move around at all. Its just for piece of mind. Only takes half hour to check both.
|
|
|
|
|
