What they DON'T tell you
#1
09-24-2011, 05:47 PM
What they DON'T tell you
what they don't tell you about engine modifications. I'm going to share a hard learned lesson about engine modifications. Almost everyone wants more power. With that comes $$$. Everyone want's the most bang for the buck. But here's what no one tells you. Harley engines are balanced to precise speck to create minimum vibration . Your piston rods have been designed for the factory piston. The crank has been balanced to factory specks . The second you change something, your throwing the engine off balance. This creates vibration. I've heard more friends complain about vibrations after a engine build than I can count. First off the crank is not designed for high compression and when you try to cut corners without changing the crank, your looking for problems . The factory piston rods from 07 up are garbage. If you want more reliable power, buy another engine . In the long run, your way ahead of the game . I personally would like to see Harley build a 124 ci engine and end this modification issue all together. Then we would have adequate power, and we could move on to better things . So before you decide to modify that stock engine. Ask the right questions.
1. Will my crank handle 10:0 .1 compression ? Not long ! 2.Will changing the piston rods throw off balance ? YES ! 3.Will the factory piston rods hold up ? Time bomb ! 4.Will the factory heads hold up under high lift cams ? Not long ! 5.Will the factory valve guide seals hold up ? NO ! 6.Will one modification lead to another because of necessity ? YES ! 7. Will this effect the engine life ? YES ! 8. Will sending off the crank to be reworked and balanced stop vibration with your new build ? NO ! Its impossible. The factory crank cant compensate for the piston rods and extra weight . So be sure to ask the RIGHT questions and save yourself a ton of problems. There's no replacement for displacement. I know a lot of guys that bit the bullet and bought a S&S 124 and was completely happy. In the long run, you will save a fortune. If I had it to do all over again, I would of pulled my new engine out when I bought it, sold it and bought a S&S 124 and been done with it. Falling into the modification trap is just that. A TRAP ! And very costly $$$ .
1. Will my crank handle 10:0 .1 compression ? Not long ! 2.Will changing the piston rods throw off balance ? YES ! 3.Will the factory piston rods hold up ? Time bomb ! 4.Will the factory heads hold up under high lift cams ? Not long ! 5.Will the factory valve guide seals hold up ? NO ! 6.Will one modification lead to another because of necessity ? YES ! 7. Will this effect the engine life ? YES ! 8. Will sending off the crank to be reworked and balanced stop vibration with your new build ? NO ! Its impossible. The factory crank cant compensate for the piston rods and extra weight . So be sure to ask the RIGHT questions and save yourself a ton of problems. There's no replacement for displacement. I know a lot of guys that bit the bullet and bought a S&S 124 and was completely happy. In the long run, you will save a fortune. If I had it to do all over again, I would of pulled my new engine out when I bought it, sold it and bought a S&S 124 and been done with it. Falling into the modification trap is just that. A TRAP ! And very costly $$$ .
#4
09-24-2011, 06:13 PM
#5
09-24-2011, 06:15 PM
what they don't tell you about engine modifications. I'm going to share a hard learned lesson about engine modifications. Almost everyone wants more power. With that comes $$$. Everyone want's the most bang for the buck. But here's what no one tells you. Harley engines are balanced to precise speck to create minimum vibration . Your piston rods have been designed for the factory piston. The crank has been balanced to factory specks . The second you change something, your throwing the engine off balance. This creates vibration. I've heard more friends complain about vibrations after a engine build than I can count. First off the crank is not designed for high compression and when you try to cut corners without changing the crank, your looking for problems . The factory piston rods from 07 up are garbage. If you want more reliable power, buy another engine . In the long run, your way ahead of the game . I personally would like to see Harley build a 124 ci engine and end this modification issue all together. Then we would have adequate power, and we could move on to better things . So before you decide to modify that stock engine. Ask the right questions.
1. Will my crank handle 10:0 .1 compression ? Not long ! 2.Will changing the piston rods throw off balance ? YES ! 3.Will the factory piston rods hold up ? Time bomb ! 4.Will the factory heads hold up under high lift cams ? Not long ! 5.Will the factory valve guide seals hold up ? NO ! 6.Will one modification lead to another because of necessity ? YES ! 7. Will this effect the engine life ? YES ! 8. Will sending off the crank to be reworked and balanced stop vibration with your new build ? NO ! Its impossible. The factory crank cant compensate for the piston rods and extra weight . So be sure to ask the RIGHT questions and save yourself a ton of problems. There's no replacement for displacement. I know a lot of guys that bit the bullet and bought a S&S 124 and was completely happy. In the long run, you will save a fortune. If I had it to do all over again, I would of pulled my new engine out when I bought it, sold it and bought a S&S 124 and been done with it. Falling into the modification trap is just that. A TRAP ! And very costly $$$ .
1. Will my crank handle 10:0 .1 compression ? Not long ! 2.Will changing the piston rods throw off balance ? YES ! 3.Will the factory piston rods hold up ? Time bomb ! 4.Will the factory heads hold up under high lift cams ? Not long ! 5.Will the factory valve guide seals hold up ? NO ! 6.Will one modification lead to another because of necessity ? YES ! 7. Will this effect the engine life ? YES ! 8. Will sending off the crank to be reworked and balanced stop vibration with your new build ? NO ! Its impossible. The factory crank cant compensate for the piston rods and extra weight . So be sure to ask the RIGHT questions and save yourself a ton of problems. There's no replacement for displacement. I know a lot of guys that bit the bullet and bought a S&S 124 and was completely happy. In the long run, you will save a fortune. If I had it to do all over again, I would of pulled my new engine out when I bought it, sold it and bought a S&S 124 and been done with it. Falling into the modification trap is just that. A TRAP ! And very costly $$$ .
Last edited by Dionicio; 09-24-2011 at 06:33 PM.
#7
09-24-2011, 06:28 PM
what they don't tell you about engine modifications. I'm going to share a hard learned lesson about engine modifications. Almost everyone wants more power. With that comes $$$. Everyone want's the most bang for the buck. But here's what no one tells you. Harley engines are balanced to precise speck to create minimum vibration . Your piston rods have been designed for the factory piston. The crank has been balanced to factory specks . The second you change something, your throwing the engine off balance. This creates vibration. I've heard more friends complain about vibrations after a engine build than I can count. First off the crank is not designed for high compression and when you try to cut corners without changing the crank, your looking for problems . The factory piston rods from 07 up are garbage. If you want more reliable power, buy another engine . In the long run, your way ahead of the game . I personally would like to see Harley build a 124 ci engine and end this modification issue all together. Then we would have adequate power, and we could move on to better things . So before you decide to modify that stock engine. Ask the right questions.
1. Will my crank handle 10:0 .1 compression ? Not long ! 2.Will changing the piston rods throw off balance ? YES ! 3.Will the factory piston rods hold up ? Time bomb ! 4.Will the factory heads hold up under high lift cams ? Not long ! 5.Will the factory valve guide seals hold up ? NO ! 6.Will one modification lead to another because of necessity ? YES ! 7. Will this effect the engine life ? YES ! 8. Will sending off the crank to be reworked and balanced stop vibration with your new build ? NO ! Its impossible. The factory crank cant compensate for the piston rods and extra weight . So be sure to ask the RIGHT questions and save yourself a ton of problems. There's no replacement for displacement. I know a lot of guys that bit the bullet and bought a S&S 124 and was completely happy. In the long run, you will save a fortune. If I had it to do all over again, I would of pulled my new engine out when I bought it, sold it and bought a S&S 124 and been done with it. Falling into the modification trap is just that. A TRAP ! And very costly $$$ .
1. Will my crank handle 10:0 .1 compression ? Not long ! 2.Will changing the piston rods throw off balance ? YES ! 3.Will the factory piston rods hold up ? Time bomb ! 4.Will the factory heads hold up under high lift cams ? Not long ! 5.Will the factory valve guide seals hold up ? NO ! 6.Will one modification lead to another because of necessity ? YES ! 7. Will this effect the engine life ? YES ! 8. Will sending off the crank to be reworked and balanced stop vibration with your new build ? NO ! Its impossible. The factory crank cant compensate for the piston rods and extra weight . So be sure to ask the RIGHT questions and save yourself a ton of problems. There's no replacement for displacement. I know a lot of guys that bit the bullet and bought a S&S 124 and was completely happy. In the long run, you will save a fortune. If I had it to do all over again, I would of pulled my new engine out when I bought it, sold it and bought a S&S 124 and been done with it. Falling into the modification trap is just that. A TRAP ! And very costly $$$ .
. . yeah, that !
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#10
09-24-2011, 06:40 PM
