Brazos River Rat ( Billy's ) Update

[Carnivalride]

Leave the 32's in it with 20% slip 110 MPH 117.3 at 15% may be time for 37's no 110/117 is fast enough. jump.gif

32's would be an excellent place to start. IMO
You may end up using 27's or 29's, but nothing lower, and the 37's will give you bigger mph, but kill the acceleration.  It's not a hydro.
Put a 7500 chip in to protect the motor and shoot for 7200 to 7400 max RPM at either flash or top end.
It'll be a fun ride.
    :smile17:

Keep in mind props can make a huge difference. I agree run it with the same prop and gear as last time for a comparison but I have no trouble seeing a lower gear depending on prop.

 

[73 Sanger Flat]

We will try the current set up .. Last time out we ran 110 mph in the current set up ..So maybe 115-120 would be good for me ..
I think we are going to shoot for about 7000-7200 Max RPM if we can ..
So with my number I show with about 17% slip at 7200 RPM , net MPH should be about 119.00 and 7000 RPM would be 116.00 MPH
JJ - what RPM did you use for your calculations ?
I am not too concern about the speed right now .. I just want to be able to go to the lake and enjoy the boat and burn PUMP GAS ..  jump.gif

 

[jdeaton]

Using my South Texas Math skills. Disturbed is the winner missing the HP number by 114 and the Torque by 12. jump.gif

I on the other hand would be secure in last place!  :smile19:

 

[Chevy2184]

Disturbed send me a pm with your address and drop it in the mail for you....👍👍

 

[73 Sanger Flat]

Look like Tim is the winner for the door prize ..
I still can not believe how much freaking power this engine that Galen built is making  clap.gif .. Unbelievable  951. HP at 6700 RPM
5900 to 7300 all above 900 HP -- It should run GOOD !!!  All of this on 91 Octane gas with 10% ethanol in it .. I pumped the gas from the QT station myself in Liberty MO ..

 

[Knotty Girl]

This is a cool deal cannot wait to watch it on the water.  clap.gif clap.gif clap.gif

 

[73 Sanger Flat]

Great job Galen, the power curve looks great for a lake/race flat. Once Billy gets that boat proped and geared it'll easily run sub 9.0s and around 125. She's gonna be a rocket next summer'

Congratulations Galen & Billy  clap.gif

Thanks Loren .. all the credit goes to Galen ..  What is your honest opinion on how many RPM do you think I will be able to turn with my current set up with the 32's in it .. 17% slip and my old prop 11 x 16 .. I would be happy if it turned 7200 with the current set up

 

[Disturbed]

Look like Tim is the winner for the door prize ..
I still can not believe how much freaking power this engine that Galen built is making  clap.gif .. Unbelievable  951. HP at 6700 RPM
5900 to 7300 all above 900 HP -- It should run GOOD !!!  All of this on 91 Octane gas with 10% ethanol in it .. I pumped the gas from the QT station myself in Liberty MO ..

Awesome power!  I'm sure you'll be happy.  For a little while!  LOL

 

[Carnivalride]

Great job Galen, the power curve looks great for a lake/race flat. Once Billy gets that boat proped and geared it'll easily run sub 9.0s and around 125. She's gonna be a rocket next summer'

Congratulations Galen & Billy  clap.gif

Thanks Loren .. all the credit goes to Galen ..  What is your honest opinion on how many RPM do you think I will be able to turn with my current set up with the 32's in it .. 17% slip and my old prop 11 x 16 .. I would be happy if it turned 7200 with the current set up

Billy it'll be tough to say exactly but if you ran 110mph before with 17% slip then what hp did the old motor make at 6600rpm? I'm on my phone so I don't have your old dyno sheet to look at. I remember 840ish hp at less than 6500. This new mill makes 950 from basically 6600-7000 so that's another 110hp. I upped mine about 100hp and gained a solid 400rpm with everything the same. I think your new mill probably makes closer to 150hp more at 7000 so as long as the extra speed doesn't blow the tail and stick the nose I don't think 7000 will be any problem but depending where the other mill was at 6600 then 7200 isn't out of the question. Just be safe testing because it will be faster.  :smile17:

Another thing to remember is that as you go faster in a flat they pack more air, free up more which equates to less prop slip and more mph sometimes at the same rpm.  :smile30:

 

[73 Sanger Flat]

Loren Here are both Dyno sheet .. The old one and the new one Old one made max HP at 6600 RPM at 843.2  New Dyno at the same RPM made 951 Hp
Old engine at 7000 RPM was 810. HP  new engine at 7000 RPM is 946.00  136 Hp difference Old engine at 7200 RPM was 785. HP  new engine at 7200 RPM is 922.00  137 HP difference
The true test will be on the water ..
I will be for sure using my Lifeline jacket when it come time to lay a hard pass down

 

[Patchman]

Bumping 1,000 hp, Nice! clap.gif clap.gif clap.gif clap.gif clap.gif

 

[73 Sanger Flat]

We had one Dyno run that the room cooled down to 71* and it made a lot more power .. But we did not think that was a comparable run to compare number with , so we did not print that run .. It was right at 982 HP with the cool room and the Dyno water being pretty hot .. So we heated the room back up and added some cool water to the storage tank and that number came back down close to what we were pulling before ..

 

[beaverfab]

Billy I was using 6800 RPM I think it will pull more but WHY, 114/ 120 on the river with no rescue, on a race course with safety ok 7200 and 125. just my .02 Looks like a grate motor. jj

 

[jimsplace]

When comparing the numbers on the new engine to the old one, keep in mind the old engine was using a cam that was designed for a much lower rpm curve if I remember correctly.
This new engine has a cam that produces a higher horsepower number in the upper rpm range where it is more beneficial and needed.
      :smile17:

 

[galen]

Billy I was using 6800 RPM I think it will pull more but WHY, 114/ 120 on the river with no rescue, on a race course with safety ok 7200 and 125. just my .02 Looks like a grate motor. jj

                                                                                                                                    Billy I tend to agree with JJ. 6800 is 400 more than it pulled with the 32s. If you look at your torque numbers you are are pulling close to 100 more ft lbs of torque and 100hp more at 6800. We know the engine will pull to 7600 rpm but as JJ said, Why. If we can keep it below 7000 piston speed is greatly reduced as is stress on the rods and all else involved.

 

[73 Sanger Flat]

Billy I was using 6800 RPM I think it will pull more but WHY, 114/ 120 on the river with no rescue, on a race course with safety ok 7200 and 125. just my .02 Looks like a grate motor. jj

I completely understand JJ

110-115 on the river is plenty fast

 

[galen]

When comparing the numbers on the new engine to the old one, keep in mind the old engine was using a cam that was designed for a much lower rpm curve if I remember correctly.
This new engine has a cam that produces a higher horsepower number in the upper rpm range where it is more beneficial and needed.
      :smile17:

  Cam is 10 degrees less at .050 Jim but the heads flow 40 cfm plus more at .700 lift.  7-4 swap and a faster ramp. Light ring pack and a whole lot stiffer valve train.

 

[73 Sanger Flat]

Billy I was using 6800 RPM I think it will pull more but WHY, 114/ 120 on the river with no rescue, on a race course with safety ok 7200 and 125. just my .02 Looks like a grate motor. jj

                                                                                                                                    Billy I tend to agree with JJ. 6800 is 400 more than it pulled with the 32s. If you look at your torque numbers you are are pulling close to 100 more ft lbs of torque and 100hp more at 6800. We know the engine will pull to 7600 rpm but as JJ said, Why. If we can keep it below 7000 piston speed is greatly reduced as is stress on the rods and all else involved.

I agree Galen .. Just thinking out loud .. I think 7000 will be the Max if it will pull that in the boat .. I will put a 7000 chip in it for safety anyway .. 6800 RPM will get it close to 115 or maybe a little more after the boat is set up ..

 

[Carnivalride]

I know coming from me this may sound bad but I'd say quit brow beating it and wait until spring and run it. Just be safe and keep in mind that it'll be quicker and faster than it was last time out.

My only thought is up here lake races are usually no more than 800' due to water conditions so I typically run geared for the 1000' stuff however I don't have 950hp.

Just relax its going to run great!!  :smile17:

 

[Carnivalride]

We had one Dyno run that the room cooled down to 71* and it made a lot more power .. But we did not think that was a comparable run to compare number with , so we did not print that run .. It was right at 982 HP with the cool room and the Dyno water being pretty hot .. So we heated the room back up and added some cool water to the storage tank and that number came back down close to what we were pulling before ..

So are the new dyno numbers corrected or observed then?