NEW QUESTION
so turns out that the dialbore gauge he was usuing has been dropped and nobody told him .... a few days ago he plastigauged the motor and came out .0007 across the mains .... i think stock is like .0009 so i am wondering if this is to tight or what???


old question
((((on the bottom end i have cp pistons eagle rods and gsr block/crank
i bought acl bearings and when we dial bore clearance the mains there at like .0025
seeing how stock is like .0015 i thought this was a bit loose

 

.0007 or .0009 is too tight. You will have a oil stravation issue.

 

You would want more than twice that clearance.

Some good info on clearances here. >http://engineparts.com/techbul...R.pdf

 

whats honda spec on a gsr?

 

well i mean ls/b20 range is .0008.0012
and gsr is .0013-.0020

is the girdle gonna make that big of a differance
guy i know personally has built ls/vtec running .008 and revs out to 10k with no bearing ware from oil restriction ..... only thing i could think is oil squirters use oil pressure so less oil to crank

 

.008 or .0008? Either way, both no good

 

ya i hear ya ..... whats minimum on gsr ? like .001

 

I measured 0.0015 on my block. Like I said, that's what you should shoot for.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">I measured 0.0015 on my block. Like I said, that's what you should shoot for.</TD></TR></TABLE>

 

i guess these are std acls ....

i also got some oem honda "reds" for him to try out if that dont work i dunno what imma do

 

Whats your clearances on the honda red bearings? They are all this tight across the board? What are the rod clearances like?

I would try to buy or borrow another bore gauge that is calibrated and measure all your mains. Then go from there.

 

There is a saying in engine building..To loose, you know it... To tight , everyone knows it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by neophyte210 &raquo;</TD></TR><TR><TD CLASS="quote">
guy i know personally has built ls/vtec running .008 and revs out to 10k with no bearing ware from oil restriction </TD></TR></TABLE>

This is dumb. Did you measure his .008/.0008 clearance personally with your dropped/defective bore gauge in 110 deg. weather insidea humid garage? Also , how do you know he has not experienced any bearing wear? Did you tap the oil pan for a bore-scope inspection hole? Dont tell me you looked at the oil as it was being drained from the car and "it was clean". Alot of time, the **** gets caught up in the pickup, or stuck at the bottom of the pan. It doesnt drain out.

DO NOT make absolute statements like the one you made above. They are misleading and false.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">

This is dumb. Did you measure his .008/.0008 clearance personally with your dropped/defective bore gauge in 110 deg. weather insidea humid garage? Also , how do you know he has not experienced any bearing wear? Did you tap the oil pan for a bore-scope inspection hole? Dont tell me you looked at the oil as it was being drained from the car and "it was clean". Alot of time, the **** gets caught up in the pickup, or stuck at the bottom of the pan. It doesnt drain out.

DO NOT make absolute statements like the one you made above. They are misleading and false.</TD></TR></TABLE>

it may sound good but pull the oil pan off and take alook in the bottom,that will tell a different story

 

i was there when he tore down the motor ... and there were no signs of excessive wear ... only trouble he runs into it pistons

 

And you verified said ".008" clearance?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by neophyte210 &raquo;</TD></TR><TR><TD CLASS="quote">and there were no signs of excessive wear ... </TD></TR></TABLE>

excessive... explain excessive, in engine bearings whats excessive to you? i know how i like mine.. with 0 wear on them... other than that someone screwed up


btw OEM specs for gsr/ type R:

0.0009 - 0.0017 1 - 2 - 4 - 5 mains SL 0.0020
0.0012 - 0.0019 3 main SL 0.0024


Modified by Chris Tune at 11:59 PM 9/26/2007

 

he runs his motor really hard .... and he did check the clearances they were at .0009 after running the motor until something failed ... and all he brakes is pistons due to high boost heat cycles 35+ psi

anyways the tightest anybody would run is .0010 ? i have haynes and they say like .0013-.0020 for gsr/itr

 

with the high rpms of a vtec motor its gonna have to have looser clearances than say a ls. most wouldnt run .001. like every one is telling a general rule of thumb is .0015 or very close either way

 

thanks guys ... i guess im gonna have to hope that the "red" honda bearings fit the way i want cause if not i might have to go with acl expanded ones