Thinking about upping my shot
02-09-2016, 11:34 AM
#1
Thinking about upping my shot I have a jet boat with a 5.3. Specs are as follows
5.3 Stock Bottom end
New Mahle plasma moly rings, gapped 26/28
Stock bearings, had about .0028 on the mains, and about .003 on the rods
Dont remember for sure, but i want to say somewhere in the neighborhood of .004 Piston to wall
ARP 2000 Rod Bolts
BTR Stage 4 NA Cam (235/242 .621/.595 111lsa)
Edelbrock Victor JR Intake
Demon 850 4150
MSD 6012 controller Timing is simple, 8 degrees initial, ramped up to 30 by 1800 with 6 degrees pulled via retard when on the bottle
NOS Cheater system currently jetted .063N .055F (if i remember correctly)
Magnafuel quickstar 275
both engine and nitrous are fed from the same pump.
Currently on the "150" shot the boat runs very strong. Both engine and nitrous system are fed pure race fuel (F&L SP-3 113 octane) and 6 degrees of timing are pulled out
BR6EF plugs, might go to 7's if i up the shot. No speckling on the plugs and the Air/Fuel ratios are still fat while on the bottle. In the 10.5 range.
I am considering bumping the shot up to a 200-250 range. Anyone running it on a stock bottom end? I tried to prepare the bottom end the best i could without buying rods/pistons.
It only sees the bottle for one or two passes (about 5 seconds each) maybe once a month if that.
Thank you for any input
5.3 Stock Bottom end
New Mahle plasma moly rings, gapped 26/28
Stock bearings, had about .0028 on the mains, and about .003 on the rods
Dont remember for sure, but i want to say somewhere in the neighborhood of .004 Piston to wall
ARP 2000 Rod Bolts
BTR Stage 4 NA Cam (235/242 .621/.595 111lsa)
Edelbrock Victor JR Intake
Demon 850 4150
MSD 6012 controller Timing is simple, 8 degrees initial, ramped up to 30 by 1800 with 6 degrees pulled via retard when on the bottle
NOS Cheater system currently jetted .063N .055F (if i remember correctly)
Magnafuel quickstar 275
both engine and nitrous are fed from the same pump.
Currently on the "150" shot the boat runs very strong. Both engine and nitrous system are fed pure race fuel (F&L SP-3 113 octane) and 6 degrees of timing are pulled out
BR6EF plugs, might go to 7's if i up the shot. No speckling on the plugs and the Air/Fuel ratios are still fat while on the bottle. In the 10.5 range.
I am considering bumping the shot up to a 200-250 range. Anyone running it on a stock bottom end? I tried to prepare the bottom end the best i could without buying rods/pistons.
It only sees the bottle for one or two passes (about 5 seconds each) maybe once a month if that.
Thank you for any input
02-09-2016, 03:31 PM
#2
As long as the tune and fueling are there you should be able to accomplish what your wanting to do. If you wanted to stick to the safer side of the line then I'd stick around 200hp. Also if going over the 200hp level you'll need to go to a 8 heat range plug.
-Chris
-Chris
02-09-2016, 04:53 PM
#3
As long as the tune and fueling are there you should be able to accomplish what your wanting to do. If you wanted to stick to the safer side of the line then I'd stick around 200hp. Also if going over the 200hp level you'll need to go to a 8 heat range plug.
-Chris
-Chris
thank you for the information. I appreciate the reply
02-09-2016, 05:11 PM
#5
Theoretical question, i don't know if you're the one to answer it or not but a curiosity on my part.
In a Jet boat, the engine sustains a max RPM. In my case, with my new impeller i sustain 4900 or so On motor. And about 5900 on the juice.
Whats "harder" on an engine? Accelerating through the rpm range on the bottle like in a car or truck? Or Spraying when at MAX rpm, letting the engine pull to its new MAX rpm (in my case about 5900) and it sits there? I would think sitting at the MAX rpm would be easier on an engine, but im no expert.
In a Jet boat, the engine sustains a max RPM. In my case, with my new impeller i sustain 4900 or so On motor. And about 5900 on the juice.
Whats "harder" on an engine? Accelerating through the rpm range on the bottle like in a car or truck? Or Spraying when at MAX rpm, letting the engine pull to its new MAX rpm (in my case about 5900) and it sits there? I would think sitting at the MAX rpm would be easier on an engine, but im no expert.
02-12-2016, 10:32 AM
#6
Theoretical question, i don't know if you're the one to answer it or not but a curiosity on my part.
In a Jet boat, the engine sustains a max RPM. In my case, with my new impeller i sustain 4900 or so On motor. And about 5900 on the juice.
Whats "harder" on an engine? Accelerating through the rpm range on the bottle like in a car or truck? Or Spraying when at MAX rpm, letting the engine pull to its new MAX rpm (in my case about 5900) and it sits there? I would think sitting at the MAX rpm would be easier on an engine, but im no expert.
In a Jet boat, the engine sustains a max RPM. In my case, with my new impeller i sustain 4900 or so On motor. And about 5900 on the juice.
Whats "harder" on an engine? Accelerating through the rpm range on the bottle like in a car or truck? Or Spraying when at MAX rpm, letting the engine pull to its new MAX rpm (in my case about 5900) and it sits there? I would think sitting at the MAX rpm would be easier on an engine, but im no expert.
-Garrett
