Rod side clearance ??

Posted By: ChevyTS

Rod side clearance ?? - 03/20/15 12:14 AM

I am working with a 440 source RB 4.250 stroke crank and a set of Eagle 7.100 rods. The problem I am having is that the rods are two wide to fit the crank. The rods seem to be Mopar width and the crank pin is Chevrolet width. Has any one found this problem before?

Posted By: Anonymous

Re: Rod side clearance ?? - 03/20/15 01:14 AM

I think they make a deal about it on their site like it is a good thing --perhaps for them if it makes you use their rods? I think you could work on the eagles and make it work--how much wider are they?

Posted By: MR_P_BODY

Re: Rod side clearance ?? - 03/20/15 01:26 AM

I have had to surface grind SB rods to fit the crank
on one of my engines... I should have gone back to
the crank company to have them do their job right..
he messed up and turned the crank to chevy diameter
but didnt do the width right.. on my last engine I did
the same thing but went back to him and he did the width..
on the SB I ground .013 off the inside of each rod
to fit with clearance

Posted By: Anonymous

Re: Rod side clearance ?? - 03/20/15 01:45 AM

They seem to be addressing the issue of Eagles on regular cranks having a mile of side room--supposed to be all kinds of oil Bogeymen bad things but I have NEVER seen any harm from tons more side room than we really need--"oh it bleeds off oil yadda yadda" I say maybe on yours but has never hurt any builds I had --Yes if you are taking a test >055 per pair is way wide but--does it hurt anything? I say no big deal but I do understand why they would want to correct this with the specs on their cranks and rods and make it more correct--I think yahoo Except--then when you go to use others rods you get --ehh..some grinding to do--all in the game of engine building me boys--these days with parts from all parts so to speak Nothing is a given or fits--Respect your engine builder--he is fighting this EVERY single day--
Never build an engine shop beside a liquor store--it is bad for the engine builders

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/20/15 02:08 AM

From memory I think the Eagle rods are 1.013 on the big end. The crank is 2.009 . I can get better numbers tonight. I have built many B/RB strokers before and I havent seen this yet. I wanted to get more input before I machine the rods to .995.

Posted By: CompWedgeEngines

Re: Rod side clearance ?? - 03/20/15 02:32 AM

Eagle rods are set up that way to fit Eagle cranks. Most any other aftermarket steel rod will fit the offshore cranks with the BBC journals. You could have them surface ground,or just get the right rods.

Posted By: dvw

Re: Rod side clearance ?? - 03/20/15 02:40 AM

Mopar rod big end width spec is 1.017", BB Chevy is .992"
Doug

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/20/15 02:43 AM

Quote:

Mopar rod big end width spec is 1.017", BB Chevy is .992"
Doug

Thanks Doug

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/20/15 02:45 AM

Quote:

Eagle rods are set up that way to fit Eagle cranks. Most any other aftermarket steel rod will fit the offshore cranks with the BBC journals. You could have them surface ground,or just get the right rods.

So that means that Eagle cranks use eagle rods. I see.

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/20/15 02:51 AM

I have been using mostly Scat products.

Posted By: dthemi

Re: Rod side clearance ?? - 03/20/15 01:55 PM

Put an old bearing in the rod. Torque it, and chuck up on the inside if the big end in a lathe and turn it down. Easier, faster.

Posted By: CompWedgeEngines

Re: Rod side clearance ?? - 03/20/15 05:49 PM

Havent tried it that way yet..lol...

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/20/15 11:24 PM

Update. The crank was 2.004 2.006. the rods were 2.007. I machined the rods to .9935 .994 I have .0014 ish side clearance

Posted By: cudaman1969

Re: Rod side clearance ?? - 03/21/15 01:52 PM

I have the same issue. Bb Chrysler alumium rod, bb chevy crank. How much side clearance should I cut for aluminum.

Posted By: Thumperdart

Re: Rod side clearance ?? - 03/21/15 04:15 PM

Quote:

Update. The crank was 2.004 2.006. the rods were 2.007. I machined the rods to .9935 .994 I have .0014 ish side clearance

Too tight imo..........

Posted By: MR_P_BODY

Re: Rod side clearance ?? - 03/21/15 04:28 PM

Quote:

Quote:

Update. The crank was 2.004 2.006. the rods were 2.007. I machined the rods to .9935 .994 I have .0014 ish side clearance

Too tight imo..........

He has .008 clearance now.. thats even tight to me
(not the .001+ he shows)

Posted By: polyspheric

Re: Rod side clearance ?? - 03/21/15 05:02 PM

X2 - .008" would make me nervous.

Posted By: Thumperdart

Re: Rod side clearance ?? - 03/21/15 05:28 PM

Quote:

Quote:

Quote:

Update. The crank was 2.004 2.006. the rods were 2.007. I machined the rods to .9935 .994 I have .0014 ish side clearance

Too tight imo..........

He has .008 clearance now.. thats even tight to me
(not the .001+ he shows)

Built a roundy round small chevy for a guy years ago and it had about .012 iirc and it ran awesome and faster than ever till it let go. The rods were burnt pretty badly and the oil full of metal. Mine are bet. .035 and .050 and have been for many years.

Posted By: Cab_Burge

Re: Rod side clearance ?? - 03/22/15 04:48 AM

Quote:

Update. The crank was 2.004 2.006. the rods were 2.007. I machined the rods to .9935 .994 I have .0014 ish side clearance

Add another .010 and you should be good, that ain't a Chevy motor

Way to loose on rod side clearances works good on Mopar stroker motors

Posted By: rowin4

Re: Rod side clearance ?? - 03/22/15 04:57 AM

Is this a new purchase from 440 source? If so they sent the wrong parts. Call them and get the right rods.

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/25/15 12:09 AM

Quote:

Quote:

Quote:

Update. The crank was 2.004 2.006. the rods were 2.007. I machined the rods to .9935 .994 I have .0014 ish side clearance

Too tight imo..........

He has .008 clearance now.. thats even tight to me
(not the .001+ he shows)

.9935 X 2 = 1.987 2.006 - 1.987 = .0019 or .994 x 2 = 1.988 2.004 - 1.988 = .016
Unless I'm doing something wrong. And I did check it with a feeler gauge

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/25/15 12:22 AM

Chilton shows .009 to .017 I have been under the understanding that .009 to .017 would be total clearance. I have not found any information that says to measure and divide by 2. If I'm wrong I need to know asap!

Posted By: MR_P_BODY

Re: Rod side clearance ?? - 03/25/15 12:27 AM

Quote:

Chilton shows .009 to .017 I have been under the understanding that .009 to .017 would be total clearance. I have not found any information that says to measure and divide by 2. If I'm wrong I need to know asap!

Its total.. for a pair of rods
EDIT
you were correct with the .016... I entered wrong numbers

Posted By: ChevyTS

Re: Rod side clearance ?? - 03/25/15 01:49 AM

Thank goodness! You had me second guessing. I havent been that nervous since that last time that I was that nervous.

Posted By: Crizila

Re: Rod side clearance ?? - 03/25/15 01:53 AM

IMO you won't have a problem with .016".

Posted By: B G Racing

Re: Rod side clearance ?? - 03/25/15 05:39 PM

Manley recommends .014 to .020.There has been a lot of concern about side clearence,mostly having too much.We have been told they correct way to measure the clearence is to measure the journal width and then measure the width of two rod caps then do the math.We still use the feeler guage check also,but find the aforementioned process more accurate.The clearence should be set to the manufactures specs.Different rods require different clearences,like aluminium that require more clearence.More is better than less the manufactures specs.