808b18c1boosted

Okay my 84mm motor just got finished but the builder that put the block together said that the bearing clearences are super loose. He told me that i have to run thicker oil. What kind of clearences do you engine buliders use, my clearences are .0027 for the mains and .0024 for my rods what do you think?


Modified by 808b18c1boosted at 5:12 AM 2/16/2005

stealthmode62

I think you may want to replace the bearings. I'm no expert, but that seems dangerously loose.

808b18c1boosted

Thats what i was thinking.

rextec

jg runs pretty loose clearances on their race motors, but i think its more along the lines of .0022

808b18c1boosted

So I should def. change my bearings.

X-Mazda 3 Racer

I have run .0025" on the mains and .0022-.0024" on the rods using 20-W50 oil. No sweat. That is how I set up all my race motors You'll be fine, I would not worry about it at all.

808b18c1boosted

This is for a daily driven app. do you think i still will be fine if I run heavyer oil. or can i still use my mobil 1 10-30 after breakin. Do you guys have oil burning issues.

X-Mazda 3 Racer

No oil burning issues whatsoever. Run 20-W50 all the time, even on break in. They should make the Mobil 1 in that weight! You will be fine. Street cars, race cars, whatever. Trust me on this.

808b18c1boosted

Ok Im droppin in the motor on fri. I will put my trust in you.

X-Mazda 3 Racer

Don't worry, just be sure to run 20-W50 ALWAYS. You wiull never have any issues

If you ever need anything, let me know.

808b18c1boosted

what oil do you run brand wise.

X-Mazda 3 Racer

I use Kendall, but for your street motor, Castrol Syntec 20-W50

TurboTegB18c

Just don't use synthetic on break in!

X-Mazda 3 Racer

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboTegB18c &raquo;</TD></TR><TR><TD CLASS="quote">Just don't use synthetic on break in!</TD></TR></TABLE>

Sorry, yes, no synthetic on breakin . Thanks TurboTegB18c, I am getting tired. Off to bed

808b18c1boosted

Yea im going to break in with 30wt non detergent oil. then after 1500 miles switch.
Bed? Its only 8:00pm but then again i live in hawaii.

X-Mazda 3 Racer

Break it in for only 100 - 200 miles on the 30wt. Then switch to the 20-W50. If the rings haven't seated by then......

earl

Vince, you have used those clearances on a Honda? How did that large clearance effect the oil pressure?

fipracing_com

Change out your bearings, to get the clearance close to spec.
Why even chance it, you got a lot of money in a built motor and if it is your daily driver, follow the honda clearance specs. A little spent now will save you a LOT later if you leave things the way they are now you could risk damaging the motor. Take a look at this post of another member who has a similar concern on low oilpressure...


https://honda-tech.com/zerothread?id=1149137

808b18c1boosted

Well i think this topic just got resparked.

Garcia-Racing

I'm curious about this, too. I run mine much tighter.

Rich 13

there is no point in running it that loose in a daily driver. and once you rack up some miles, spun bearings here i come


Modified by Rich 13 at 2:44 AM 2/17/2005

808b18c1boosted

How much do honda bearings cost ne way.

Rich 13

dont know about honda speficially but they should run you around $50

W O T

Honda says there service limit is .020.....

Im running mine super tight

But hey if GE says runnig thicker oil will be cool than Id go with it.

DOnt know how low your oil pressure would be though, already forget if this is a Vtec motor but high pressure will be a must for that

Rich 13

why start with something that is out of spec to begin with, it makes no sense and is dumb