I'm building an all-motor LS and would like some opinions here. I have oem oversized p30 pistons. Block will have arp head studs and the rods have been fitted with arp hardware also and have been shotpeened and reconditioned. P2W clearance is .0015 and the crank, pistons, and rods have been balanced. The align bore has been checked. I also had the machine shop write down the measurements on the main bores, main journals, rod journals, and rod bore. Here are the results:
Rod Bore: 1.8903 (all 4)
Rod Journal:
(#1) 1.7712, (#2) 1.7711, (#3) 1.7712, and (#4) 1.7712.
Main Bore:
(#1) 2.3237, (#2) 2.3238, (#3) 2.3238, (#4) 2.3238, and (#5) 2.3238
Main Journal:
(#1) 2.1649, (#2) 2.1647, (#3) 2.1647, (#4) 2.1648, and (#5) 2.1648

Honda OEM Specs are 0.0008-0.0015 on the rods. Crank #1,2,4, and 5 are 0.0009-0.0017 and #3 is 0.0012-0.0019. I was planning on running my clearance right about in the middle of the specs. 0.0013 for main #1,2,4, and 5 and .0016 for #3 and 0.0012 rod bearing clearance. I am planning on using this engine for a weekend car and for a few autocrosses a year. I will be using OEM Bearings. Does this sound good, or should i set them a bit looser, as seen in other people's builds?

 

i would recomend tht u run a little more clearance espically if it is a high rpm motor. i would say anywhere from .015-.020 and youll be fine.

 

.015-.020" good lord

I like to shoot for .0017-.0019"

 

...bump...anybody else?

 

shi* well you know what i ment.. .0015-.0020. your specs fall right into what i said b4.... there are tons of factors anywayz on how much clearance you should run....

 

Higher rev motors tend to want a tighter clearence, at least thats what i've been taught, i'd run oem specs if your running oem rods / pistons your not running any outragous combo of power parts.. so run oem.. thats what your running.

 

My set-up will be anything but oem. I'm shooting for a 200 whp LS, kinda like the one King Motorsports did. I have a head from Combustion Contraptions, Crower 404 cams, S2Pro I/M, and so on and so forth.

 

actually its just the opposite, high performance engines tend to want greater clearances. only because they operate at higher engine speeds so the oil temp is ran hotter due to fluid film friction, reducing its viscosity value. the greater clearance is also there to allow you to have enough space from deflections/imperfections on the rods, block or shaft. OP, if i was you man i would go with what you had said before and go with the clearances right in the middle to be on the safe side. since its not a race car you wont need the crazy tolerances. and since your going to give it a lil more abuse than normal dont run it too tight. in t he middle is the safest thing you can do. if you run your clearances tight your going to have to use a lower winter protection oil. stick with the 5w30. if you decide to run on the higher side of the spectrum i would switch to a 10w30.

 

and also to add I do plan on running this motor up to 8400 RPM's. Like I said before, I'm trying to get the same results King got on their All-Motor LS Build.

 

sorry man but off the top of my head i cant remember the exact color bearing you need for your setup, i wish i did but i dont. i trust you're able to find it here on your own using the search tool. hope you plan on getting the rotating assembly balanced. and you know you'll need some decent cams to make power to 8400 rpm. good luck

 

I do have the chart for what bearings that I will need. The rotating assembly got balanced, and I'm pretty sure the crower 404's will be good up to that high.

 

sounds like your good to go man.... how soon do you think you'll have that thing running?

 

We will see how long its gonna take to get running. I still need a transmission, axles, exhaust, ecu, ecu tuning source and a few other random things. The suspension is all done and the brakes are good too. I want to get the shortblock assembled and then worry about finding a transmission and everything else.

 

I think I've decided on what I'm going to run my clearances at. 0.0017 for the main's (1,2,4,5) and 0.0019 for #3 and 0.0020 for the rods.