Lunati Rod bolt torque

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Mark O'Neal
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Lunati Rod bolt torque

Post by Mark O'Neal » Thu Oct 11, 2018 6:12 pm

I have a customer that has Lunati Rods with a bolt marked Lunati 0294.

Does anyone have a torque spec?

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Re: Lunati Rod bolt torque

Post by Mark O'Neal » Thu Oct 11, 2018 7:29 pm

7/16 looks like it's stainless?

Anyone?

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Re: Lunati Rod bolt torque

Post by modok » Thu Oct 11, 2018 8:45 pm

You can go by stretch, and find the torque it takes to stretch it a reasonable amount based on length and a reasonable guess on material.
The torque for the rod of course is not necessarily the maximum torque for the bolt anyway, it's just how much safety margin they have on the bolt.

I'm probably not telling you anything you don't already know but...... if you look at stretch specs in for all the bolts you'll see....a significant trend, because in the end steel just has the same kind of modulus, and all men are brothers. The torque it takes to get there on the other hand can be all over the place.
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Re: Lunati Rod bolt torque

Post by MadBill » Thu Oct 11, 2018 9:31 pm

Not trying to be a Dic*, but have you asked Lunati?
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

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Re: Lunati Rod bolt torque

Post by Mark O'Neal » Thu Oct 11, 2018 11:39 pm

Calling Lunati is a last resort. It has proven fruitless in the past.

I thought I'd ask the experts first.

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Re: Lunati Rod bolt torque

Post by cjperformance » Thu Oct 11, 2018 11:39 pm

MadBill wrote:
Thu Oct 11, 2018 9:31 pm
Not trying to be a Dic*, but have you asked Lunati?
You ask all the silly questions Bill ! :lol:
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Re: Lunati Rod bolt torque

Post by cjperformance » Thu Oct 11, 2018 11:40 pm

But seriously, the easiest and safest method would be to buy a new set of bolts to suit that come with a spec, tq them, check the big end id and go from there.
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Re: Lunati Rod bolt torque

Post by Keith Morganstein » Fri Oct 12, 2018 5:18 am

Mark O'Neal wrote:
Thu Oct 11, 2018 7:29 pm
7/16 looks like it's stainless?

Anyone?
AFIK lunati rods have ARP bolts, 8740 or 2000 with lunati stamped into the head.
What is the underhead length of the bolt?
Automotive Machining, cylinder head rebuilding, engine building. Old school shop, semi-retired moonlighter. Can't seem to quit #-o

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Re: Lunati Rod bolt torque

Post by modok » Fri Oct 12, 2018 6:12 am

Mark O'Neal wrote:
Thu Oct 11, 2018 6:12 pm
I have a customer that has Lunati Rods with a bolt marked Lunati 0294.

Does anyone have a torque spec?
If you look at 0294 upside down, it resembles like 8620
Glen Urban

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Re: Lunati Rod bolt torque

Post by BillK » Fri Oct 12, 2018 6:38 am

Mark,
First step in my opinion is to call Lunati like the others said. That being said, my old (2006) Lunati catalog says .005-.0054 stretch on the Pro Mod and Pro Billet rods and .0039-.0043 on the Street Race rods. I did not look on the web site to see if this has changed.
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Re: Lunati Rod bolt torque

Post by Mark O'Neal » Fri Oct 12, 2018 2:19 pm

I haven't spoken with them since Joey called me to tell me he was leaving, but he had to go back and get the rent check.

But I guess I'll have to.

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