To balance, or not to balance...opinions on ls/vtec
I'm about to start the assembly on my LS block and I'm going to be taking some of the internals to have some machine work done. I'm having the stock LS rods redone with ARP bolts and then having them resized, and having pr3's pressed on for a nice bump in c/r. For now I'm not worried about the head, it's time will come...for now I want to focus on the block. This question's for those of you that have built ls/vtec's with good success...would it be worth the extra time and money to have the rotating assembly completely balanced? After some research and money restrictions I'm probably going to limit this motor to the 8500-9000rpm range, and will run near the 12:1 c/r near the final install. I'm debating on whether to just stick to a micropolish on the crank and be done with it, or whether I should get the extra balancing work done. Bearings will be clearanced on the loose side, will allow me to load the crank right away and oil's being supplied by a modified and ported 94 gsr pump. Any thoughts and suggestions?
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Re: To balance, or not to balance...opinions on ls/vtec
Balance it. :y
The B18A/B engine was only built to rev up to 7000 rpm, after that due to the centrifugal force on the lower end, it tends to wear bearings faster, and or throw rods out of the block. Making sure that all of the lower rotating assembly is balanced puts an even pull from one end of the crank to the other. Ive done a few LS vtec's in my day. Spend the money, do it right the first time, and you can run that bastard up to 9k no problem. O0 |
Re: To balance, or not to balance...opinions on ls/vtec
Originally Posted by Sepheroth86
Balance it. :y
The B18A/B engine was only built to rev up to 7000 rpm, after that due to the centrifugal force on the lower end, it tends to wear bearings faster, and or throw rods out of the block. Making sure that all of the lower rotating assembly is balanced puts an even pull from one end of the crank to the other. Ive done a few LS vtec's in my day. Spend the money, do it right the first time, and you can run that bastard up to 9k no problem. O0 |
Re: To balance, or not to balance...opinions on ls/vtec
I would absolutely love to build this motor the proper way, having everything balanced etc. But lately with work being shitty, and my cash getting less and less I have a feeling I'm going to end up just rebuilding the bottom as a stock LS, swapping the b16 head, and building another cheap boost setup. :-\ Kinda sux that I sold most of my stuff though :P
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Re: To balance, or not to balance...opinions on ls/vtec
I have 10k miles on my ls/vtec in my 5g hatch. Gsr head, wiseco pistons, eagle rods, acl bearings, slapped it together without balancing anything and I rev the crap out of it. We`ll see how it holds.
A great man once said, balancing is for pussies. :P |
Re: To balance, or not to balance...opinions on ls/vtec
Originally Posted by Sepheroth86
Balance it. :y
The B18A/B engine was only built to rev up to 7000 rpm
Originally Posted by Sepheroth86
it tends to wear bearings faster, and or throw rods out of the block.
Originally Posted by Sepheroth86
Ive done a few LS vtec's in my day. Spend the money, do it right the first time, and you can run that bastard up to 9k no problem. O0
(slo... do the rod big/small end balances, and the piston balances, ---- the rotating assembly spin balancing as it's already mint) |
Re: To balance, or not to balance...opinions on ls/vtec
Thanks for the info JD. As far as the piston balances goes, I'm just going to leave the stock pr4's on them and see how they weigh out. The more I've been thinking about hitting the edge of the 200hp mark with way more money spent than should be, the more the itch of boost is crawling back into my head. Still sucks though that I'll be sitting around a 9.8:1 c/r once the motor's assembled, although my b16 is right about 10.26:1 and it held boost just fine. 14psi is what worries me, although it's still sub 300hp. :l
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Re: To balance, or not to balance...opinions on ls/vtec
Why don't you just put forgings in the bottom end and be done with it?
(Humor me, this is going somewhere constructive) |
Re: To balance, or not to balance...opinions on ls/vtec
Originally Posted by Joseph Davis
Why don't you just put forgings in the bottom end and be done with it?
(Humor me, this is going somewhere constructive) |
Re: To balance, or not to balance...opinions on ls/vtec
If you can afford the pistons, I have three perfectly good LS Eagles you can have. Ben at importparts.com, or better yet Craig at Tunertoys, can get you the fourth for $80-85 shipped.
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