Do you think this is a good idea?

Some people say no while others say "YES". I think it is the same crank that the Neo VVL engine uses.

Do I stick to the regular DE or DET crank with 8 counterweight or should I go with the RR crank that only has 4 counterweights?

All comments are welcome

Thank you

Do you think this is a good idea?

Some people say no while others say "YES". I think it is the same crank that the Neo VVL engine uses.

Do I stick to the regular DE or DET crank with 8 counterweight or should I go with the RR crank that only has 4 counterweights?

All comments are welcome

Thank you

That is a good question because it is something i have been thinking about all winter being that i have both motors sitting in my garage!

Why would you not use the stronger 8 CW crank on a turbo car?

Why would you not use the stronger 8 CW crank on a turbo car?

I have never seen a 4 CW fail yet. Engines Neo VVL have it and I've even seen some VVL turbo with them and never fail from I've read. However, I have not read any input yet about putting it instead of the 8 CW on a DET engine.

I am trying to do this because for what I have read, the 4 CW is lighter, strong enough and was made as an improvement over the 8 CW. So newer is better in this case.

I don't see anything wrong by using the 8 CW however, I see it as an area of opportunity to use the 4 CW... but maybe someone has done it before and can give us some input, that if it worth it or not and if it has some risk on doing so.

Don't you think the same?

Lighter will also mean less mass and quicker acceleration. :)

All comments are welcome guys. I really need to find out this fast to be able to buy the RR crank or just a regular.

Thank you

That is a good question because it is something i have been thinking about all winter being that i have both motors sitting in my garage!

Hopefully someone with experience on this or deeper knowledge can answer us.

You can use it. If youre going turbo i suggest you install the bearing cap girdle as you would with an 8 CW.

I have a knife-edged 4CW I am using for an NA engine without the bearing girdle but for turbo I prefer the 8CW w/ the girdle, personally.

You can use it. If youre going turbo i suggest you install the bearing cap girdle as you would with an 8 CW.

That's what I did. I have a highport block (+girdle, oil pans, etc) with a RR head and 4cw crank. :biggthump

On the other hand, I've had similar setups with an 8cw crank, and I really can't tell any difference.

You can use it. If youre going turbo i suggest you install the bearing cap girdle as you would with an 8 CW..

You mean this right?

http://www.sillbeer.com/images/engine/enginestrip-20091017-crankgirdlebaffle2.jpg



I have a knife-edged 4CW I am using for an NA engine without the bearing girdle but for turbo I prefer the 8CW w/ the girdle, personally.

So basically, from your experience, you are telling that the best is that I should stay as is and do not mix the cranks, right?



Thank you for your time to answer my friend.

That's what I did. I have a highport block (+girdle, oil pans, etc) with a RR head and 4cw crank. :biggthump

On the other hand, I've had similar setups with an 8cw crank, and I really can't tell any difference.

So you keep everything and only change the crank, which was my original idea too. However I though you would feel a difference like when you remove the stock flywheel and use a lbs instead...

So, now that you already did it my friend.. Would you recommend doing this or not?

Thank you for your time to answer :)

Well, if you already have a RR crank and you're trying to avoid buying an 8cw crank, it wouldn't hurt anything to use it, but I wouldn't go out of my way to get one.

My original plan was to use a RR motor and put oem DET pistons in it. I wasn't planning on making big power, and I wanted a lowport, so that's why I picked a RR.

The motor that Soko sent me was a pile of sh*t (:mad:) so I ended up going in a totally different direction.

i used the 4 counter weight crank in a turbo build before. i had no problems with it and i like using them.

Well, if you already have a RR crank and you're trying to avoid buying an 8cw crank, it wouldn't hurt anything to use it, but I wouldn't go out of my way to get one.

My original plan was to use a RR motor and put oem DET pistons in it. I wasn't planning on making big power, and I wanted a lowport, so that's why I picked a RR.

The motor that Soko sent me was a pile of sh*t (:mad:) so I ended up going in a totally different direction.

The only reason I was asking was because someone offered me both, 4CW and 8CW at the same price, so it's my choice. I thought a 4CW would be better but for all comments I read hear it seems it's not really worth it.

I guess I will stay with the 8 CW

The only reason I was asking was because someone offered me both, 4CW and 8CW at the same price, so it's my choice. I thought a 4CW would be better but for all comments I read hear it seems it's not really worth it.

I guess I will stay with the 8 CW

I think there should be some type of advantage over the heavier unit. In puerto rico people use 92 mazda protege in mx3's because the 92 has a 4 cw crank and can produce high horsepower and are pretty reliable. I know mazda is totally different than a Nissan but thought I'd share that. I have both motors in my garage and working thru to turboing the RR and will let everybody know about how it goes.

the weakness in the RR is ot in the crank its on the instability and rev limitations of the valvetrain due to the roller rockers...not to mention theres only one afternarket cam for them.

The 4CW crank will carry less inertia then the 8 CW. There are arguable benefits and disadvantages to a lighter rotating mass and vice versa....so its a matter of deciding what your goals are. the 8CW is pretty damn indestructible. lol but the 4 will hold enough as well as long as the engine is built right. youd probably see a little faster response from the 4cw, but would be negligible on a big turbo car IMHO

the 8CW is pretty damn indestructible. lol but the 4 will hold enough as well as long as the engine is built right. youd probably see a little faster response from the 4cw, but would be negligible on a big turbo car IMHO

And this is exactly the kind of feedback I wanted to hear back from you guys. Resuming... it's not worth it, you get little to none benefits and you can get more into trouble that keeping the 8CW...


Anyone has a spare 8CW in excellent std size to sell? :D I still need one