y7turbo

I have a d16a6 motor im building with scat rods.

I have tried acl bearings the clearance comes out to .0007"
clevite 77 bearings come out to the same
honda RED bearings come out to .0012

i have a 1-2" mitutoyo inside micrometer and a 1-2" outside micrometer both are good to .00005", those are what i used to measure. i also used plastigage to double check i thought maybe i was using the micrometers wrong, nope.

is my only option to resize the rod? anyone know how much the rods can be resized before ***** with the bearing crush? i would like to resize them so i can get a .002" clearance and then i want to coat the bearings.

anyone else have this problem?

thanks for the help.

JaredKaragen

it sounds like the rods need to be machined out slightly, but it is the inside surface that needs to be worried about. If you are coating the bearings, maybe they can do some precision machining to get them trimmed.

Maybe just requesting a custom set of bearings might be in order.

y7turbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaredKaragen &raquo;</TD></TR><TR><TD CLASS="quote">it sounds like the rods need to be machined out slightly</TD></TR></TABLE>

something im not to happy about. these scat rods have been nothing but problems.

i had to send them back to scat, it took 6 months to get them back and now i have to do some work to them. I dont hear people doing this **** to eagles.


thanks for your help man.

Tippyman

You said you already tried the loosest of all the honda bearings?

y7turbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tippyman &raquo;</TD></TR><TR><TD CLASS="quote">You said you already tried the loosest of all the honda bearings?</TD></TR></TABLE>

yeah from all i have found the RED bearings smallest.

Schister66

new rods...machine the crank/rods

Redwidow

I had this problem with clearances too tight try another TQ wrench and report back, i used a new one and it was way out of tolerance

HiProfile

...or a bolt stretch gauge. This is the only thing I worry about, not having a tq wrench I know was calibrated.

From what I know, the nitride (or whatever) treatment Honda used goes .0010" deep, so you might want to try having the crank repolished in addition to lightly honing the rods. As long as its all done correctly, it shouldn't be a problem. I'd suggest one at a time, erring on the side of the rods - get an OEM rod and see what you get.

y7turbo

thanks guys, ill call the machine shop on monday and see what he can do for me.

bolt strech gauge is next on my list of tools.

how many times can i torque these rod bolts before i should worry? i have torqued them about 5-6 times each so far.

D@nnY

that happens with eagles often as well...

Jared

You can have any machine shop put a slight hone on the rod, or run the ACL race bearing that adds .001

TTT

order clevite 77 "X" bearings. They are 0.001" undersize. That should take care of it.

y7turbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote"> or run the ACL race bearing that adds .001</TD></TR></TABLE>


arent those the same as honda red bearings?

the regular acl's are .0592" each bearing half, the "RACE" is .0587" per half. same as the red honda bearing which is .0586"-.0587" per bearing half.

i could be wrong but those are the numbers i have found.

rorik

How much of a variance in size is there between factory crankshafts? If there is a sufficient variance, you might be able to get another crank from ebay, (that's where I got my gsr crank..perfect clearances with eagle rods) for cheap, and get the right clearances. Just an idea..I'd say a better one than removing the nitriding on your crankshaft, if it works.
Why did you get the scat rods over the eagles?

DRAGLS

I don't recommend that you resize the rod just so you can get the proper clearance.

Instead just get the crank machined.

D@nnY

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">You can have any machine shop put a slight hone on the rod, or run the ACL race bearing that adds .001</TD></TR></TABLE>


wont work they are the same as honda reds. ive done it before

y7turbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redwidow &raquo;</TD></TR><TR><TD CLASS="quote">I had this problem with clearances too tight try another TQ wrench and report back, i used a new one and it was way out of tolerance</TD></TR></TABLE>

looks like your onto something.

i got out my digital caliper to measure the bolts before and after torquing them.

also i think my scat spec sheet is wrong or something. they want the arp2000 3/8" torqued at 50. doesnt eagle use the same arp2000 3/8" bolts at 43ftlb?

i tried 43 ft lb and i got .005 bolt strech which is close to the spec sheet.

.0014-.0015" on all my rod bearing clearances now.

are those ok or should i still go for larger clearances?

thank you

Tippyman

Don't even use the torque wrench, just use the stretch specs.

Garage 808 Hatch

arent there 2 sizes of acl races? regular and .010?

Redwidow

not a problem..

quicksilver1689

cant go wrong if u measure stretch instead of friction

D@nnY

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by y7turbo &raquo;</TD></TR><TR><TD CLASS="quote">

looks like your onto something.

i got out my digital caliper to measure the bolts before and after torquing them.

also i think my scat spec sheet is wrong or something. they want the arp2000 3/8" torqued at 50. doesnt eagle use the same arp2000 3/8" bolts at 43ftlb?

i tried 43 ft lb and i got .005 bolt strech which is close to the spec sheet.

.0014-.0015" on all my rod bearing clearances now.

are those ok or should i still go for larger clearances?

thank you

</TD></TR></TABLE>

you measured the bolt stretch with a digital caliper?

y7turbo

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

you measured the bolt stretch with a digital caliper?</TD></TR></TABLE>

i ordered a bolt stretch gauge already, im just waiting for it. I used the caliper to see of i could get a reading on it.

as soon as i get my stretch gauge, ill have my final results.

Garage 808 Hatch

what ever you do, do not have the crank ground. on a honda, that is the worst idea ever. if needed have the rods honed. my crank was on the large end of the factory specs, and my manley rods were on the small end, we honed them slightly to get the clearance with acl race bearings. the crank is treated and when you grind it, you remove the harder outer nitride layer