598 ford breaking rods cylinder 2 and 6. any ideas

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598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 22nd 2015, 9:47 pm

I have a 598 ford that has busted 2 rods on number 2 cylinder. They are oliver rods. It is a Bryant crankshaft and a kasse oil pump There is never any noise and has had good oil pressure. It seams to let go about 300 foot in a run. I had the crank rebuilt by marine crank shaft in CA. If any one has any ideas. This is a c headed nos motor but has busted both times with out the nos on this last time I had 8 runs on it before it broke. The block is a ulta premier block from idt.

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Larry T on October 22nd 2015, 10:20 pm

what bearing clearances are you using?
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 22nd 2015, 10:32 pm

would have to check with the machine shop that put it together I think they were .0025 or .0030

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  soupbean on October 22nd 2015, 11:11 pm

If it were me, I would go to GRP or Bill Miller aluminum rods.
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  FalconEh on October 22nd 2015, 11:25 pm

Where are they breaking...same place?
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  cool40 on October 22nd 2015, 11:40 pm

Where is the rod broke? Pic's would be nice. Suspect
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Wheelie58 on October 23rd 2015, 6:35 am

What do the bearings look like?
Usually if a steel rod "breaks" it is when the bearing fails and seizes.
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  dfree383 on October 23rd 2015, 6:47 am

Lean cylinders? Bad tune?
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 8:22 am

Will try to post picks tonight. It the same rod. Breaks on the big end. Bolts bust off in rod and cap comes off. Then crank hits rod and bust rod or the ears off the rod

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  dfree383 on October 23rd 2015, 8:26 am

Torquing the bolts correctly? How many uses on the bolts?

Have you talked with Oliver?
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 8:29 am

I had the wsb bolts just install the new bolts the are using. The rod that broke was a new rod from oliver. I has a reputable machine shop do the work I assume they torque them correctly

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  dfree383 on October 23rd 2015, 8:48 am

onefastpickup wrote:I had the wsb bolts just install the new bolts the are using. The rod that broke was a new rod from oliver. I has a reputable machine  shop do the work I assume  they torque them correctly

I'd talk with Oliver.... And I wouldn't assume anything.

Also maybe go over your NO2 system and flow everything.

Check the ignition to and make sure everything is right, that could do it also.
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 8:53 am

It has broke the rods with the nos off just running on the engine I will call oliver today thanks

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  cool40 on October 23rd 2015, 9:36 am

I had about 8 passes on mine when it got the bearing out of it and would have failed had I not heard hit just before staging the car. I didn't have enough deck clearance . Idea
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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 3:25 pm

I think the Pistons are .020 in the hole if I remember right.

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Lem Evans on October 23rd 2015, 6:19 pm

Are the rod bearings black and/or blue?


Last edited by Lem Evans on October 23rd 2015, 7:03 pm; edited 1 time in total

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 6:30 pm

The bearing is gone haven't checked #6 yet will try to post pic

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Lem Evans on October 23rd 2015, 6:48 pm

onefastpickup wrote:The bearing is gone haven't  checked  #6 yet will try to post pic

It aint 'gone' it's in the oil pan....somewhere Smile

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 6:51 pm

#6 is black looking # looks melted to crank

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Lem Evans on October 23rd 2015, 6:57 pm

Not the rod's fault .

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Lem Evans on October 23rd 2015, 7:02 pm

Not what you want to hear.....junk the crankshaft & put it back together with .0027-.003" clearance on the rods and .0033-.0035" on the mains.

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  supervel45 on October 23rd 2015, 7:17 pm

onefastpickup wrote:#6 is black looking # looks melted to crank
What is the side clearance of the rods in question? Any blue on the rod on the big end sides?

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  Lem Evans on October 23rd 2015, 7:24 pm

Oliver rods and a Bryant crank aint got no side clearance issues.

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  onefastpickup on October 23rd 2015, 7:26 pm

That what I was thinking I called marine crankshaft about the crank they said they put it back to standard size 2.199 it had 2 new oliver rods. The bearing I took out was .001 over could that of been 2 tight

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Re: 598 ford breaking rods cylinder 2 and 6. any ideas

Post  supervel45 on October 23rd 2015, 10:27 pm

onefastpickup wrote:I have a 598 ford that has busted 2 rods on number 2 cylinder. They are oliver rods. It is a Bryant crankshaft and a kasse oil pump There is never any noise and has had good oil pressure. It seams to let go about 300 foot in a run. I had the crank rebuilt by marine crank shaft in CA. If any one has any ideas. This is a c headed nos motor but has busted both times with out the nos on this last time I had 8 runs on it before it broke. The block is a ulta premier block from idt.
" Rebuilt" Is it still to Bryant Spec? Got to double check everything and assume nothing.

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