[Fot] Carrillo Rod Bolts

Tue Jul 29 18:52:39 MDT 2025

I have some “ lightly ” used 1/4 inch rod bolts going cheap -lol . Can deliver to lime rock !
Sent from my iPhone

On Jul 28, 2025, at 5:15 PM, Tony Garmey <vintageclassicsus at outlook.com> wrote:

 Interesting thread ! The 250 k also is running the 1/4 Carrillo rod bolts . The rods are custom made to original design where the rod split is at 45? Degrees
Sent from my iPhone

On Jul 28, 2025, at 4:18 PM, Brad Eells via Fot <fot at autox.team.net> wrote:

 I believe Marty Sukey has had one of these fail on track with catastrophic results.

This is one of the reasons I chose Pauter rods with 5/16 bolts for the 1300 Spitfire.

Or maybe it was because Chuck Gee told me to. I think Kas said something like, “never argue with a metallurgist…”

Brad Eells
Sent from my iPhone

On Jul 28, 2025, at 2:59 PM, Barr, Scott via Fot <fot at autox.team.net> wrote:

I wouldn’t kid about a thing like that.  See photo attached.  They neck down from 1/4” to something like 3/16ths and then the threaded portion is 1/4” again.  The one in the photo found its yield point as I torqued it up on a rebuild.  The info provided by Mark below would have been very useful in avoiding this failure.  User failure causing bolt failure, I guess.  Live and learn.

If they’re now 3/8ths, that’s an improvement over the Carillo rods I have in my 1500 race motor.  I like the Carillo rods, but didn’t love the little rod bolts.

Scott (B.)

From: Fot <fot-bounces at autox.team.net> On Behalf Of robertten1--- via Fot
Sent: Monday, July 28, 2025 12:01 PM
To: FOT Triumph <fot at autox.team.net>
Subject: Re: [Fot] Carrillo Rod Bolts

Scott,

I hope you were kidding about the 1/4" bolts for the Spits.  Looking them up they are the same for the TR6 ... 3/8 "  fine thread.

My 2cents,
Bob T
63 spitfire
64 spitfire autocrosser

On Monday, July 28, 2025 at 12:39:27 PM EDT, Barr, Scott via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:

I always had trouble with the process of determining whether the Carillo rod bolts were returning to zero stretch after the use.

How do people handle that?  Do you create a chart for each bolt in each location – i.e., lower rod bolt, rod #1?  And then set them in a labeled rack pending reassembly?

I sometimes felt like I was getting them mixed up and could never trust that I was measuring the same bolt for the same hole.

These were the teensy little ¼” Spitfire rod bolts that took, I think, 18 ftlbs of torque.  Part of the reason I liked my Pauter rods was that I could use a much larger ARP rod bolt.

Scott (B.)

From: Fot <fot-bounces at autox.team.net<mailto:fot-bounces at autox.team.net>> On Behalf Of Mark Craig - Diesel Performance Parts via Fot
Sent: Friday, July 25, 2025 10:44 AM
To: Friends Of Triumph <fot at autox.team.net<mailto:fot at autox.team.net>>
Subject: [Fot] FW: Carrillo Rod Bolts

Hey Triumph Friends!

The info connecting rod and connecting rod fastener info below is possibly VERY useful for a lot of you so I thought I would post it for everyone. I have removed the contact at Carillo to keep them form being pestered with questions but this is direct from the head man at Carillo that is involved with rods and rod bolts daily.

<https://www.dieselperformanceparts.com/>

<image001.png><https://www.dieselperformanceparts.com/>

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
https://www.dieselperformanceparts.com/

<https://www.facebook.com/dieselperformancepartsinc>

<image002.png><https://www.facebook.com/dieselperformancepartsinc>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

Sent: Friday, July 25, 2025 10:38 AM
To: Sean Alexander <alex3rail at gmail.com<mailto:alex3rail at gmail.com>>; Brendan Alexander <brendan.tr4197 at gmail.com<mailto:brendan.tr4197 at gmail.com>>
Cc: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Subject: RE: Carrillo Rod Bolts

HI Sean,

Happy to help.

This may be more information than you need to make a decision.

The stretch range can be achieved between 70-100ftlbs.

However, this does not mean that you need to go to 100ftlbs to achieve the proper stretch.

Once you achieve the proper stretch you don’t keep torquing the bolts.

It is possible to have the bolts take less torque to achieve the desired stretch; this is one of the reasons there is a torque range rather than a suggested torque.

This is even more true when the rods and bolts are used and have been torqued multiple times already, as the bolt under head to spot-face and the threads of the two components can polish each other differently. Since torque is only measuring the force to overcome the friction between the two parts, the more polished they are the less friction thus the less torque.

We did a study here a few years back and saw that if we took the same rod and bolt and tightened it to the same torque number the bolt kept stretching until it was no longer polishing itself. Same for stretching the bolt repeatedly we saw the required torque dropping. In both of these tests the torque and stretch seemed to stabilize after approx. 10 torque cycles, this could vary overall as well as between different bolts which is why we prefer recommended stretch since bolt stretch actually determines how much clamp load the bolts are providing.

With that said, when you loosened them, do they return to zero on the stretch gauge?

If they do return to zero, then you can still use the bolts. If not I would replace them.

I know some customers will just replace the bolts for peace of mind, but I do not think this is necessary if the bolts do not continue to get grow in length once released.

Fyi, I would put a max of 0.001 permanent stretch from original length.

Hope this information helps you.

If you have any questions or need further assistance. Please feel free to reach out to be by email or phone.

Kind regards

<http://www.cp-carrillo.com/>

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A member of Pankl Group
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Our email disclaimer<https://pankl.com/racing/en/legal/disclaimer/>

CP-Carrillo, Inc.
1902 McGaw Ave
Irvine, CA 92614
Phone: 949-567-9000
Fax: 949-567-9010
www.cp-carrillo.com<http://www.cp-carrillo.com/>

From: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Sent: Friday, July 25, 2025 6:21 AM
To: Sean Alexander <alex3rail at gmail.com<mailto:alex3rail at gmail.com>>
Cc: Brendan Alexander <brendan.tr4197 at gmail.com<mailto:brendan.tr4197 at gmail.com>>; Richard Batchelor <
Subject: RE: Carrillo Rod Bolts

Meet Sean at Alexander Raing he is the fellow with the rod bolts we have conversed with, Can you and he talk and then Sean will decide if and how many bolt sets he needs. See his email info below on the stretch he is seeing.

Thank you.

<https://www.dieselperformanceparts.com/>

<image001.png><https://www.dieselperformanceparts.com/>

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
https://www.dieselperformanceparts.com/

<https://www.facebook.com/dieselperformancepartsinc>

<image002.png><https://www.facebook.com/dieselperformancepartsinc>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander <alex3rail at gmail.com<mailto:alex3rail at gmail.com>>
Sent: Thursday, July 24, 2025 3:33 PM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Cc: Brendan Alexander <brendan.tr4197 at gmail.com<mailto:brendan.tr4197 at gmail.com>>
Subject: Re: Carrillo Rod Bolts

Mark,

Ouch on the price

We have two bolts that we did not go past the recommended max torque of 100 ft/lbs but the elongation was .002" over max.  or total of .0095".   We snuck up on the torque checking the stretch each setting until we saw the overstretch.   We loosened and retorqued at the min of 70 ft/lbs and they stretched to .007" must faster/lower toruqe than previously and faster than any of the other bolts.

Can you field our specific  situation with your contact or we can call Carrillo and get you out of the middle on this part of the discussion.

What is the lead time on 2 or 4 bolts?

Regards,

Sean Alexander

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On Thu, Jul 24, 2025 at 2:47 PM Mark Craig - Diesel Performance Parts > wrote:

Sent you an email yesterday?? The factory guy at Carrillo says those bolts are good for 18-20 retorques. He seems to feel you don’t need to replace them till then?

His exact words:

These bolts can be torqued 18-20 times without issue.

They are 54.53 per bolt if you want new ones though.

<https://www.dieselperformanceparts.com/>

<image001.png><https://www.dieselperformanceparts.com/>

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
https://www.dieselperformanceparts.com/

<https://www.facebook.com/dieselperformancepartsinc>

<image002.png><https://www.facebook.com/dieselperformancepartsinc>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander <alex3rail at gmail.com<mailto:alex3rail at gmail.com>>
Sent: Thursday, July 24, 2025 2:42 PM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Cc: Brendan Alexander <brendan.tr4197 at gmail.com<mailto:brendan.tr4197 at gmail.com>>
Subject: Re: Carrillo Rod Bolts

Hi Mark,

Following up on the rod bolt pricing and delivery.

Regards,

Sean Alexander

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On Mon, Jul 21, 2025 at 9:13 AM Mark Craig - Diesel Performance Parts > wrote:

Great pic thanks!

I will see what they say!!

<https://www.dieselperformanceparts.com/>

<image001.png><https://www.dieselperformanceparts.com/>

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
https://www.dieselperformanceparts.com/

<https://www.facebook.com/dieselperformancepartsinc>

<image002.png><https://www.facebook.com/dieselperformancepartsinc>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander <alex3rail at gmail.com<mailto:alex3rail at gmail.com>>
Sent: Monday, July 21, 2025 8:39 AM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Cc: Brendan Alexander <brendan.tr4197 at gmail.com<mailto:brendan.tr4197 at gmail.com>>
Subject: Carrillo Rod Bolts

Hi Mark,

We need to replace our rod bolts.

Part number that came with the Rods you sold us is

S6-N-037-PS

Looking forward to your reply on price and lead-time.

<image008.png>

<image009.png>

Regards,

Sean Alexander

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On Wed, Aug 18, 2021 at 5:17 PM Sean Alexander <alex3rail at gmail.com<mailto:alex3rail at gmail.com>> wrote:

Yep, not surprised.

Please proceed with with the qouted lead time.

On Wed, Aug 18, 2021, 3:10 PM Mark Craig - Diesel Performance Parts > wrote:

Got to love the current state or production!!!

Carrillo needs a confirmation from you to me so I can send it back to Carrillo on these rods. Here is their story and they want to make sure you are agreeable with it:

These are only made when ordered and cannot be cancelled for any reason

Production is 12-14 weeks

Please confirm your customer can wait.

Lead Times

Due to an overwhelming demand and work load, our lead times have gone up and cannot be guaranteed.

Steel Rods are Approx. 12-14 weeks production

Pistons are Approx. 10-12 weeks. More complex designs may take longer and Coatings can add 2-4 weeks depending on the coatings requested.

While we will always do our best to meet our delivery dates during this time, there are times we may be late.

We are implanting a required deposit for custom Pistons and Rods, please ask what deposit may be required for your order.

Custom orders are not cancellable for any reason, even if we are running late on your order.

We apologize for any inconvenience this may cause you and your customers.

We are doing our best and will strive to improve our deliveries as best as we can

 <http://dieselperformanceparts.com/>

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
www.dieselperformanceparts.com<http://dieselperformanceparts.com/>

  <http://dieselperformanceparts.com/>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander [mailto:alex3rail at gmail.com<mailto:alex3rail at gmail.com>]
Sent: Wednesday, August 18, 2021 2:29 PM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Subject: Re: Carrillo Rods For TR4

Hi Mark,

Excellent, thanks for double checking.

Please place an order for the set of four rods ~ CAR-TM-TR4-66250-S.

Let me know when you need the check mailed or if you have another payment preference.

Appreciate your support to the Triumph racing community.

Are you actively racing your car this year?

2022 Kastner Cup is at the Pitt International Race facility, only a 10 or 11 hour tow from Nashville.

Regards,

Sean Alexander

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On Wed, Aug 18, 2021 at 1:14 PM Mark Craig - Diesel Performance Parts > wrote:

Nope that is correct!!

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
www.dieselperformanceparts.com<http://www.dieselperformanceparts.com/>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander [mailto:alex3rail at gmail.com<mailto:alex3rail at gmail.com>]
Sent: Wednesday, August 18, 2021 12:07 PM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Subject: Re: Carrillo Rods For TR4

Hi Mark,

Increase is $24.84 for the set of 4?  Any chance you have a typo  in the price,  I would have expected a larger increase considering all of the craziness.

Regards,

Sean Alexander

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On Wed, Aug 18, 2021 at 11:15 AM Mark Craig - Diesel Performance Parts > wrote:

Sean,

Ok they did go up, steel costs and C19 and all that BS of course.

New cost is 1187.36 for a set of 4. Last time on 2018 they were 1162.52.

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
www.dieselperformanceparts.com<http://www.dieselperformanceparts.com/>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander [mailto:alex3rail at gmail.com<mailto:alex3rail at gmail.com>]
Sent: Tuesday, August 17, 2021 11:41 AM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Subject: Re: Carrillo Rods For TR4

Craig,

Sounds good.

Regards,

Sean Alexander

ARE

the-vintage-racer.com<http://the-vintage-racer.com/>

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On Tue, Aug 17, 2021 at 10:49 AM Mark Craig - Diesel Performance Parts > wrote:

They changed pricing big surprise with C19 right??

Trying to get a new cost for you but there is no one around at so many vendors. Give me a moment. I’ll get you a number.

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
www.dieselperformanceparts.com<http://www.dieselperformanceparts.com/>

Phone: 615-834-0066
Fax: 615-834-9923
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Sean Alexander [mailto:alex3rail at gmail.com<mailto:alex3rail at gmail.com>]
Sent: Sunday, August 15, 2021 11:06 AM
To: Mark Craig - Diesel Performance Parts <mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>>
Subject: Carrillo Rods For TR4

Hi Mark,

Hope you have been well!

Looking for current pricing for the same Carrillo four rod set you sold us in 2018 (reference your invoice 382923) CAR-TM-TR4-66250-S

Regards,

Sean Alexander

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