Topic: Carrillo Rods - Installation Questions

[vnz00]

Hi Folks,
I'm currently building an 836 F2. Like other members here I have opted to use the carrillos, supplied by dynoman.

Just a few questions:
1. The bolts supplied - when sizing up the bearings they will need to be tensioned and released, possibly a few times. I have read elsewhere that you need to measure the bolts with a stretch gauge before starting, and check them after each tension cycle, and discard them after they have stretched .001" in their released state.  Is this general consensus?
2. Is using a stretch gauge the way to go? I'd like to do it this way but is there a corresponding torque figure using a torque wrench? (I think max is 40lbs)?
3. Are there any other tricks I need to know about?

Thanks all in advance. I have read quite a few builds on the forums with guys using these rods. But there are only scattered bits an peices. I'd like the info present in one thread so others can benefit from the experience on here...

Regards,
Steven V.

[bwaller]

My Carrillos use 1/4" multi phase Carr bolts. They recommend not more than 215in/lbs. and 0.004 to 0.006" stretch. I imagine there is a special "guage" and maybe I'll be embarrased, but this is how I did it. Measure the bolt loose first.

[vnz00]

Thanks bwaller- yes there is a special tool which is really just doing what your doing.  It sits like a clamp over the rod bolts and locates in the small holes at either end.  Idea is that you tighten the bolts with the gauge attached and measure stretch to the required amount.

Here is a good article on how it's done:
http://www.carcraft.com/techarticles/116_0609_using_rod_bolt_stretch_tool/viewall.html

The CARR bolts according to Buzz at dynoman are apparently the stronger bolts and can be tensioned several times.  His response to my questions are as follows:

The instructions that came with your rods are all you need to know. There are 2 different bolts available for the CB750 rods. The WMC bolts that that have a limited number of times that they can be torqued and the stronger CARR bolt that you have that can be torqued many times without problems. The WMC bolts are about $40 less so some people sell them, however we only sell rods with CARR bolts, so you will be fine. It does not matter if they are .001" longer than when they were first installed.

The best way to get the correct torque is to measure the bolts and tighten them to .005" - 007" of stretch. This needs to be done with the bolt lube that comes with the bolts. 40LBS is close, however most torque wrenches are not calibrated as often as they need to be and can give you an incorrect reading. You cannot go wrong if you measure the bolts however.

Hope this provides some insight into it all.  I was a little worried thinking the CARR bolts could only be used once or twice, but Buzzs info helps.

Any other comments are welcome
Steven.

[MRieck]

The dial stretch gauge is nice. The indicator itself is not typical as it has a much more powerful return spring. I torque the bolts in a vice, measure and note the torque on the wrench. I than torque to that #. Falicon has a nice little article on using shim stock to prevent twisting the big end when torquing the cap down. I find it interesting that Carrillo did not dimple the ends of their bolts until rather recently (maybe 4 years). Without the dimple it makes it hard to get an exact reading. ARP always has done it  (at least on the bolts I've seen).

[Big Jay]

Both the Carrillo WMC bolt and the CARR Multiphase are way over kill for the Honda sohc.  In the busas, we have seen 225+ HP with the WMC bolts without failure. You would be hard pressed to find a Honda making that power.

We were the ones that convinced Carrillo to offer the sohc 750 rod with the WMC bolt. It allows us to offer the rods at a reasonable price to our Honda customers.

The bolts used by Carrillo and Crower are absolutely the best available.

[fang]

Good reminder conversation.  Thanks vnz00 for posting the article link.
-fang

[Don R]

I've stretch measured the rod bolts on my racecar and it is so much over torque spec that it will scare you. Hard to grasp but that's the way it is.

[bwaller]

I admit this is a first time for me, so although 0.006" doesn't seem like much, when you release the torque the extra "spring" is immediately evident especially on these 1/4" bolts.

[Big Jay]

I admit this is a first time for me, so although 0.006" doesn't seem like much, when you release the torque the extra "spring" is immediately evident especially on these 1/4" bolts.

Is this a sohc 750 rod?

[bwaller]

No Jay, little bro CB550.

[Big Jay]

OK. I asked because I had never sold a set of Carrillos for the 750 that had 1/4" bolts.