dyno predictions?
06-26-2008, 04:15 PM
#1
dyno predictions? Well ladies and gentlemen, tomorrow is the big day. My engine should finally get on the dyno. What do you think it'll make at the flywheel? It's built for nitrous, but will be N/A tomorrow
LSX 441ci 11:1 cr
6.125" Lunati Pro Billet Rods
4.125" Compstar Callies crank
4.125" custom Wiseco pistons for nitrous
Meziere street version w/p
LS7 heads ported and polished with Ti and sodium filled valves
LS7 carb intake
950 Quick Fuel Technologies carb modified for E85
MSD coils and wires
Harland Sharp custom made roller tip rockers (still 1.8:1)
Melling high pressure and high volume oil pump
Kook's 2" primary headers w/LS7 flange and 3 1/2 collectors
custom grind Comp Cam 112 LSA (other specs not available right now)
MSD ingnition controller for LS2
Cloyes double roller timing set
I'll be shooting a video of it. I'm really excited for tomorrow.
LSX 441ci 11:1 cr
6.125" Lunati Pro Billet Rods
4.125" Compstar Callies crank
4.125" custom Wiseco pistons for nitrous
Meziere street version w/p
LS7 heads ported and polished with Ti and sodium filled valves
LS7 carb intake
950 Quick Fuel Technologies carb modified for E85
MSD coils and wires
Harland Sharp custom made roller tip rockers (still 1.8:1)
Melling high pressure and high volume oil pump
Kook's 2" primary headers w/LS7 flange and 3 1/2 collectors
custom grind Comp Cam 112 LSA (other specs not available right now)
MSD ingnition controller for LS2
Cloyes double roller timing set
I'll be shooting a video of it. I'm really excited for tomorrow.
Last edited by toneloc60; 06-28-2008 at 01:36 PM. Reason: different carb
06-27-2008, 08:16 PM
#2
One of the car mags built something along the lines of your engine, (it was a LSX iron block 427) and came away with around 600 Hp. That figure was with a stock Z06LS7 camshaft. Your cam and extra inches should push that number much higher. They used a 950 HP holley and felt that a 1000 CFM plus carb would have pushed the numbers a bit higher. This is an interesting combination. Let us know how things shake out.
RGJ
RGJ
06-28-2008, 12:17 AM
#3
Well, due to having the wrong crank sensor, it didn't fire today. Should fire on monday though. Oh, and I have specs on the cam now:
Gross valve lift (based on 1.7:1 and I have 1.8:1 rockers)
Intake Exhaust
Lift .623 .623
Duration 254 266
112 Intake center line
114 lobe separation
Gross valve lift (based on 1.7:1 and I have 1.8:1 rockers)
Intake Exhaust
Lift .623 .623
Duration 254 266
112 Intake center line
114 lobe separation
06-30-2008, 10:46 PM
#5
Yep. Just got home a little bit ago. Engine didn't come home with me. There were still gremlins to get out of the system.
One was getting over the stock rev limiter that comes pre-programmed in the MSD box. Easy fix after getting a laptop hooked up.
Next was way too high oil pressure. I'm running a Melling high press. / high volume pump. Running 20w50 for break in the pressure was hitting 135 psi. We cut three coils out of the spring and it was still too high. Found the answer in 5w30 and letting the engine really warm up. Oil temps above 200 degrees let the pressure down to a safe 70-80 psi during pulls.
For some reason the valves were floating above 6300, but we decided to do some pulls to 6200. I don't have the sheets with me, but we made 701 hp at 6200 with really no tuning on 110 octane and the graph was shooting an arrow in the sky when we backed out of it. It was also making a peak of 650 something ft/lbs of torque.
Tomorrow the valve float will be figured out and the tuning with timing and the carb will be taking place. We still have another 700 or so RPMs to twist and we still have to get it on E85.
Sorry for the novel, but that's the update.
One was getting over the stock rev limiter that comes pre-programmed in the MSD box. Easy fix after getting a laptop hooked up.
Next was way too high oil pressure. I'm running a Melling high press. / high volume pump. Running 20w50 for break in the pressure was hitting 135 psi. We cut three coils out of the spring and it was still too high. Found the answer in 5w30 and letting the engine really warm up. Oil temps above 200 degrees let the pressure down to a safe 70-80 psi during pulls.
For some reason the valves were floating above 6300, but we decided to do some pulls to 6200. I don't have the sheets with me, but we made 701 hp at 6200 with really no tuning on 110 octane and the graph was shooting an arrow in the sky when we backed out of it. It was also making a peak of 650 something ft/lbs of torque.
Tomorrow the valve float will be figured out and the tuning with timing and the carb will be taking place. We still have another 700 or so RPMs to twist and we still have to get it on E85.
Sorry for the novel, but that's the update.