703crewchief

Sorry guys, no flow numbers or cam specs. What I need to know is what kind of clearances LS1 builders like to see on a non stock bottom end. Stock Max rod side clearance is .020". With a Manley Chevy small block 6.125 rod I'm getting .022" side clearence. Also my main bearing clearances are hovering around .0027" with the factory specs being .00212". I haven't measured the rod bearing clearances yet. Everything is round and straight and I'm using a ported oil pump, do you guys think there will be any oil control problems. Oh yeah, Im using the Federal Mogul Performance series standard size main bearings, and the Clevite H-series standard size rod bearings. Any suggestions would be great.

703crewchief

TTT
Anyone have any suggestions? TA2SLOW346 weren't you having a similiar issue? What kind of problems am I going to see with this much clearance. will this thing have oil pressure? Can I compensate with heavier oil?

Country Boy

iTrader: (24)

If you want to get that techincal... call MTI or Thunder Racing or ARE.They are the only ones that can answer those type of questions.

703crewchief

Head flow dynamics, Cam events, and predicting horsepower are far more technical than simple engine building. Everyone on here seems to have that down though. I was hoping maybe someone from one of those shops or another would be on this forum. I will call one instead, thanks for the advice.

Country Boy

iTrader: (24)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 703crewchief:
<strong> Head flow dynamics, Cam events, and predicting horsepower are far more technical than simple engine building. Everyone on here seems to have that down though. I was hoping maybe someone from one of those shops or another would be on this forum. I will call one instead, thanks for the advice. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Very true! If it doesnt involve cam specs, heads, or valve springs... you probably wont get an answer <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

TA2SLOW346

iTrader: (3)

Yeah I'm getting .025 side clearence with my eagle rods. The reason your not getting answers is, about 1% of the people here build there own engines. MTI told me to shim the oil pump to make up for the lost oil pressure from the extra side clearence. I'll see what happens in a month or so when i fire it up for the first time.

Country Boy

iTrader: (24)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TA2SLOW346:
<strong> Yeah I'm getting .025 side clearence with my eagle rods. The reason your not getting answers is, about 1% of the people here build there own engines. MTI told me to shim the oil pump to make up for the lost oil pressure from the extra side clearence. I'll see what happens in a month or so when i fire it up for the first time. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hummmm... Ill have to remember that since Im using the Eagle H Beam rods on MY build up <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> How about it you just get a pump like the ARE unit that is already shimmed for more pressure? <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

<small>[ March 18, 2003, 04:58 PM: Message edited by: Country Boy ]</small>

Pro Stock John

iTrader: (34)

I wish I could help, I have not yet balanced my rotating assembly. I have Eagle 6.125's and a stock crank. Mine will be a while since I am also going to cryo the stock crank. I am aware of the side clearances but have been told that they are not significant, but that's not technical answer. I have cc'd a few folks this thread.

Jason99T/A

iTrader: (21)

Are you getting .022" of side clearance on all the rods? You could mix and match the rods until get the desired clearance. If the clearance becomes too tight, you can always polish the sides with ~#180 grit paper. I would always rather them be too tight to start with since you can take out material to get the desired clearance. If it ends up being way too loose, you may have to get another set of connecting rods. You will not be hurting anything running the .022" side clearance though. Anything more than .025" would be excessive.

Shoot for .002-.0025 on the rods and .0025" on the mains. This is where we have set up every LS1 motor we have built and have not had any oil pressure or bearing problems.

Jason

TJF

Hey PSJ: Who in the Chicago area does cyro treating? Also, are you going to nitride your crank also? Please e-mail me and let me know. Thanks. T.J.

703crewchief

Thank you for the replies. Some of the side clearances are a tad bit higher than .022, around .025. All of my bearing clearances are tight enough though, and I do have the Thunder Racing oil pump. The machinist also told me not to worry. The rotating assembly is being balanced as I type. Thanks again.

Country Boy

iTrader: (24)

Where are you getting your tolerance specs from?

703crewchief

My tolerance specs are from a GM service online manual. The guy that owns the engine is a Chevrolet Technician, and he has access. We just were not sure what was acceptable or used beyond factory specs. They like to build LS1s tight from the factory for longevity. Hell, the one in the car right now has 116,000 miles on it and still runs mid 12's. Its just getting broke in. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> The new motor with the stronger parts is for Nitrous and I just wanted to be sure to keep the bearings supplied with plenty of pressure.

Country Boy

iTrader: (24)

Anyway you could shoot me over those specs? I dont want to use the ones from the Chilton/ Haynes manuals.

countryboy@shawus.com if you can. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />