24ounce Posted February 7, 2007 Share Posted February 7, 2007 what is knife edging and should i consider it for the stroker build is there anything else i should look into - ive got arp main studs and arp rod bolts comming in and new main and rod bearings and i have been stressing balance balance balance - there a good shop they have built a ton of race engines and they know what there doing though its mostly chevy v8 stuff but i dont fear the quality of the shop Quote Link to comment Share on other sites More sharing options...
Challenger Posted February 7, 2007 Share Posted February 7, 2007 They give the crank a "knife edge". Smoother then a blunt end. If I do a motor Id definetly do that along with balancing like you said to make a real smooth motor. I dont really mind but alot people will have a fit if you dont search. It only took me couple of seconds to find it on google. Good Luck Quote Link to comment Share on other sites More sharing options...
24ounce Posted February 7, 2007 Author Share Posted February 7, 2007 ya i normally search but i didt want to search through 57639836986 pages and read a book about it - i just wanted a nice simple answer in quick time like you provided - thanks Quote Link to comment Share on other sites More sharing options...
greenmonster80 Posted February 7, 2007 Share Posted February 7, 2007 Make sure you get a quality balancer and get it balanced with the whole assy from balancer to pressure plate. Quote Link to comment Share on other sites More sharing options...
katman Posted February 7, 2007 Share Posted February 7, 2007 I wouldn't trust a "mostly Chevy" shop to knife edge and heavy metal balance a Nissan L6 crank. Fuggetaboutit. Spend the money on dyno tuning instead. The payoff will be greater. Quote Link to comment Share on other sites More sharing options...
24ounce Posted February 7, 2007 Author Share Posted February 7, 2007 well they have done some l series work and when i first went ther ei talked to an older guy and he knew more about l series junk then i did they have just never done L stroker is knife edging not worth it then? or is it somethign i should do befor i get this pile all built Quote Link to comment Share on other sites More sharing options...
Guest 280ZForce Posted February 7, 2007 Share Posted February 7, 2007 knife edging is a big no-no. I forget why but my auto teacher said it's not good for some reason. But i've heard it'll cut the engine life drastically. Quote Link to comment Share on other sites More sharing options...
24ounce Posted February 7, 2007 Author Share Posted February 7, 2007 ok well it sounds like it isnt gonna hurt much of anything if i dont do it and i had orignally planned on not doing it so i guess its not gonna happen - im just in a panic now that the machine shop actully has all my stuff - this is my first real motor build Quote Link to comment Share on other sites More sharing options...
slownrusty Posted February 7, 2007 Share Posted February 7, 2007 I am doing a serious Turbo L6 build complete with JE custom pistons and a Diesel crank and I am NOT knife edging the crank. Not sure if that helps or not. Yasin Quote Link to comment Share on other sites More sharing options...
datsunlover Posted February 7, 2007 Share Posted February 7, 2007 My understanding of it is simply to eliminate some 'drag' caused by the crank turning through the oil. A knife edge will slice through much cleaner and smoother than a blunt (stock) edge therefore freeing up some power and likely reving faster... although, maybe someone more knowlegable can chime in here? Quote Link to comment Share on other sites More sharing options...
olie05 Posted February 7, 2007 Share Posted February 7, 2007 isn't that what dry sump systems are for? Quote Link to comment Share on other sites More sharing options...
SHADY280 Posted February 7, 2007 Share Posted February 7, 2007 i thought it was also elimintaing some rotating mass, thus getting quicker revs. id say the balancing is one of the best things to do, im kicking myself for not doing it to my motor. gonna have to pull the motor again one day. Quote Link to comment Share on other sites More sharing options...
johnc Posted February 7, 2007 Share Posted February 7, 2007 knife edging is a big no-no. I forget why but my auto teacher said it's not good for some reason. But i've heard it'll cut the engine life drastically. Your shop teacher should stick to teaching kids how to do oil changes on Camrys. Below is a lightened and knife edged L6 diesel crank that had at least 20 hours of hard racing on it at NA power levels over 320 horsepower. Quote Link to comment Share on other sites More sharing options...
katman Posted February 7, 2007 Share Posted February 7, 2007 Of course Mr. Coffey's crank wasn't prepped by a "mostly Chevy V8" shop either, but instead by one that understood the nuances of heavy metal balancing L6 cranks. Quote Link to comment Share on other sites More sharing options...
dimsum Posted February 7, 2007 Share Posted February 7, 2007 isn't that what dry sump systems are for? A dry sump system ensures the engine always has oil to lubricate the parts (external oil storage instead of an oil pan). One of the additional benefits to dry sumps is that the crankshaft isn't sloshing and cutting through the oil in the pan. Quote Link to comment Share on other sites More sharing options...
24ounce Posted February 8, 2007 Author Share Posted February 8, 2007 well i guess i wonte do it this time - after i blow this one up or build another ill take it to rebello and do forged junk along with other stuff like the knife edge - im not going for any crazy 500hp build right now - hopefully when i get a little older and have a bit more change to toss around Quote Link to comment Share on other sites More sharing options...
1 fast z Posted February 8, 2007 Share Posted February 8, 2007 The more mass you have the better dampening that is done. When you remove mass you remove dampaning material. It is NOT needed, and you will NEVER notice the power output difference in a street/strip car. JohnC's car was not either of those. Quote Link to comment Share on other sites More sharing options...
Challenger Posted February 9, 2007 Share Posted February 9, 2007 Anyone tried those things they sell on ebay that scrapes the oil of the crank as it spins and its supposed to "reducing rotating mass" "improving power and engine response" ect. Quote Link to comment Share on other sites More sharing options...
RedNeckZ Posted February 9, 2007 Share Posted February 9, 2007 Yes, Having a oil scraper does help. Most of it will be in the upper reachs of your RPM limit. It helps with the removal of oil from the rotating mass of the crank and directing it else where (back to pan). Rich. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted February 9, 2007 Share Posted February 9, 2007 knife edging is a big no-no. I forget why but my auto teacher said it's not good for some reason. But i've heard it'll cut the engine life drastically. Your shop teacher is alittle underinformed. Knife edging of cranks is usually reserved for high end motors that are trying to extract every HP potentially available. Crank windage is a big one, and it entrains air into the oil on wet sump systems. I'm not sure if it will make a difference but all those little hp adders add up at some point in time. I think the general point is to spend your money on what nets you the biggest gains first. If your shop teacher thinks it shortens the life of motors then he shouldn't go visit a nascar engine room or watch superspeedway engines do 9000+ rpm for 500 miles plus qualifying!!! Quote Link to comment Share on other sites More sharing options...
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