I'ved Searched already and all I got was the definition of a knife edged crank. I would just like to know if anyone in this Board has this set-up. I am currently running a Spoon lt wt flywheel and debating if lightening the crank would be beneficial? My Top end is built but now concentraring on my 1.6 block. Anyone with this setup would you pls share your pro's and con's, thanks!!!

thanks
judd

 

dont worry about the crank...get lighter rods and pistons if you want to lighten the bottom

Dave

 

i seen this at the machine shop many times
what it is is just lightening the crank
its like runing a lighter flywheel
its just lessing the rotating assembly weight which mean your revs will drop even faster and you should gain a lil power
suposely this also makes the crank cut into the oil better since it edges are sharpe
but in all reality your not going to gain much power from doing this. your revs will just drop faster. i mean this will not save more weight then say a lighten flywheel and a lighten flywheel really wont give you much more power the revs just drop a lot faster

but when i build my motor i did everything but this. i really dont think its nessary to spend 300 bucks to lose only 5 pounds max. there are better ways of spending your money like building the internals.
i would only do this if you already have forged pistons, rods, pp head, im , hondata, and everything else

 

you live in lomita...very close to http://www.rsmachines.com ...
i'd consult with them.

 

for the price of doing it..you might as well throw a gsr/itr shortblock in there.

 

thanks for the inputs

The head I have had fully built made, 187whp/116 tq so that I got taken care of already . Reason why I will not spend money on lighter rods and pistons is because of cost ,I am in a budget. My engine builder said that the b16 rods can take a beating till 9k which is where my max is right now and will not go further. Pistons I have already, I got ctr.025 over . the flywheel that I have had for 4 years now I really enjoy! gets you in the powerband quick.

When I did a search most people say that having your crank knifedged is like having a flywheel (sensation wise-Quicker revs) but what if you have a flywheel already and would like to have your crank knife edeged?what would the outcome be drivability wise ? performance wise I think is a positive one,am i right on the last part?...

thanks
judd

 

I have a knife-edged crank in my LS-VTEC and it revs really fast. It was done by Benson's and they said they took 17 pounds off the original weight. It is really easy to spin the wheels, but driveability is still good. Overall I like it, if I do another build I would probably not do it because of cost, but I am glad I did it with this one.

 

knife edging is a method borrowed from old push-rod motors where the crank sat almost completely in the oil pan. since the edges are sharper, it's supposed to help cut through those last few strands of oil polymer quicker. doesn't really help out honda motors too much since the crank barely sits in the oil pan.... for the price, run a lightened flywheel, crank pulley, or forged internals. you don't want to throw off the balance of crankshaft anyways.

 

Spocks hatch- did i hear you correctly? did you say 17lbs?

 

do not listen to that guy that said it took 17 pounds off the weight
he has no idea what the hell he is talking about
there is no way in hell that much weight can be taking off
when u knife edge the crank only a few pounds are taken off

you shouldent post false information and dont post at all if u dont know what you are talking about

 

Yeah I think 17 lbs is a little too much. I've heard that its usually around 3 to 5lbs. About throwing off balance I wouldn't worry about it since its a 4cyl and the shop that I will be taking it too is very reputable among the engine builders here in the southbay

Well I guess with the knife edging and lt wt flywheel the drivability would be greatly affected but performance wise I think there is a good gain. This set-up by the way is not geared towards drag racing , it's more on occasional road racing


thanks

judd

 

That is just the weight that the machine shop told me that they took off. It may not be 17 pounds but it is definately more than 5 pounds cuz I held a regular LS crank and my crank and the diference was quite noticeable.

 

i see . Thanks man I might go ahead and do it..

judd