i tried to search but i couldnt get anything useful. is there any pros or cons on this? im going to be building a gsr engine and just interested if this would be a good idea. please explane.

cheers

 

Read this, or call Mr. Castillo himself http://www.turbomagazine.com/tech/06...ice/index.html

 

i read the whole article but it doesnt say if its a good idea. what about cost? any idea what kind of power gains off of doing this?

 

bump

 

Depends on how much you want done to your crankshaft. Expect anywhere from $500 on upwards to $1500.

The idea is that with a lightened crankshaft, much like a lightened flywheel, it'll reduce the reciprocating mass, therefore, allow your engine to rev up faster so that you can get into your powerband faster.

Also keep in mind, the B18C5 crankshaft IS HEAVIER than the B18C1 crankshaft. Partly due to extra counter-weights to help the engine maintain stability through high RPM's. The B18C5 does come with a lightened flightwheel as opposed to the B18C1.

 

so should i just go for a lightened flywheel than doing work on the crank?

 

I think you meant rotating mass? The crank does not reciprocate.

 

A flywheel does not need to cut through oil.A crank does. It would be kinda like holding your hand out the car window flat vs. sideways. Which is going to have less resistance??.. Less rotating mass on N/A is always great.

 

i saw on another thread that this guy had his oil pump blow up. he thinks it might be because of the knife edge crank. i just want to make sure its ok to do this befor i spend the money. lol

 

An unbalanced crank will kill an oil pump yes... Get it balanced.

 

ok. here is one for you i had a oil pump blow up in my bone stock b16a and it had around 70k on it. unbalanced crank?

 

keep in mind that things are not supposed to last a lifetime. If they did how could honda make money on parts? An oil pump may last 70k, 150k who knows it really depends on the driver!

 

IMO, If loosing a race by one tenth of a second means not being able to put bread on your table. That's when you spend the money on knife edging a crank. If this is just for fun, your money could be put to better use elsewhere. Unless you have money to burn.....

 

Well put. If its mainly street driven and you want the MAX reliability then balance the crank and leave it alone. If its going to see more track time then street or your just looking to make as much horsepower as you can then go ahead and do it.

 

Castillo's will do you right. I think Todd(B19coupe) had one done there a couple of years ago, he was selling it for 450 so it can't cost much more than that. My next build will have knife edged and V cut counterweights .

 

Jaime' (Castillos) knows his stuff when it comes to cranks. You cant go wrong with him. He is a great guy.

 

Yes, you're right. Thank you. Was a long day.

True, but it's not something that one should just do to do if they are daily driving it cruising around on the freeway with it. If you spun a rod and need to take the crank in to get fixed and re-balanced, then it doesn't hurt to consider spending a little extra money to get a little more work done on the crank, assuming one has the time to wait for the crank to get done right.

Castillo is great. Had a single cam crank offset welded before to turn it into a 1.8 L stroker crank. My only regret is that while I went to a good crankshaft shop, I didn't do my research well and had my block sleeved poorly.

Those that get work done at ProStreet are lucky, since they are right next door to Castillo's.

 

im just looking for more power but reliable. its a daily drivin car. im trying to stay away from boost. but i might throw a supercharger on for a little more power with basic up keep

 

What exactly have you done to your car so far? I wouldn't tear apart the engine to get the crank knife-edged if it didn't need a rebuild. If you were considering a rebuild, you might want to go 2 Liter if you haven't already?

 

well its a gsr with i think about 240k on it! i have taken the valve cover off and it looks very clean!!! it smokes a bit. someone told me that you can put a ls crank and rods in a gsr and it will make more power so im looking into that. i dont have anything set in stone yet. im doing a little research befor i start the build.

 

i havnt put the engine in yet. im rocking the ls swap

 

I'm not sure what your goals are because you haven't mentioned them, but from the sound of it your better off spending money else were in your build. The cost just don't out weigh the benefit. Getting your bottom end balanced is worth it especially since most of you guys are rev happy.

 

ok thanx for the input! it seems to me that a knife edge crank just isnt worth the money. cheers!

 

Isnt worth the money for what? You havent given anybody a single thing to work with!

 

people tell me that its not worth the money hp gains to $. its a daily drivin car im not a track guy. and im not worried about the .2 sec extra on a 1/4 mile.