CMR racing products F1 frame

[T Legg]

I see you stuck with the rs-38 flat slides. Have you tuned them to run correctly now ? Mine are now working very well on my fj1100.

[FJ1200W]

I see you stuck with the rs-38 flat slides. Have you tuned them to run correctly now ? Mine are now working very well on my fj1100.

Glad to hear you have yours dialed in. I have a set that I want to use, but they were converted to methanol, so I have some work to do.

Or - run E85?

This is a interesting thread.

[fj1289]

Awesome build!

Too bad there weren't a bunch of other custom frames built for the FJ motor like there was for the Suzuki GSXRs, etc   

About zero chance of finding one of these used ......

[Indiana jones]

It's been a while since I had an update.
Put some road miles on the bike during last summer.
Pulled it apart over the winter for final prep for the now cancelled Classic TT.
So thing slowed down a tad.
My goal now is to get the the Bikers Classic in Spa, Belguim at the beginning of July.
I'm going to build a spare engine out of all my bits, so I can do a track day or 2 while my race engine is being built.
Brexit has screwed up me getting parts from the UK, so it's cheaper and easier to send the engine and parts over to Peter Hickman Racing for the build.
I've just been gathering my parts and double checking what I have and what I need.
Everything checked out until I made a very close inspection of my lightened crank from a drag bike.
It is a work of art, but I have noticed some subtle mods.
The conrods look new and are matched, evident by the lightening holes in the big end caps.
Also, the oil way from the big end, the one that shoots oil to the underside of the piston has been blanked.
I'm guessing that this extra lubrication/cooling isn't required in a drag bike doing short runs.
I don't think it's going to work in a race bike.
Is this a common drag bike modification?

[Indiana jones]

Looks like it's been modified to prevent the bearing from spinning.
How the hell do I identify the bearing when I have no number on the rod and no colour on the bearing apart from plastigauge each one.
The code on the bearing is "D3K",is that relevant?

[fj1289]

Randy should be able to help you out with sorting the bearings. 

Yes and no as far as blocking off the piston squirters.  Yes in that most drag race motors will probably have Carrillo rods - and they do not have piston squirters.   No in that I've never seen the squirters on stock rods blocked off before. 

I always thought that hole was to be a "reservoir" of oil - never seen it used to "pin" a bearing into place.  Bearings don't "spin" and THEN cause damage.  Bearings are first damaged (catastrophically) which CAUSES them to spin. 

If I were in your shoes, I'd spring for some XJR rods.  You would know what size they are at least (one variable removed from sorting bearing sizes) and you'd have the squirters too.  On top of all that, the XJR rods are lighter and stronger than the FJ rods. 

[Indiana jones]

I have a low mileage Xjr1300 engine that I'm building up, so I'll just use everything from that and this crank.
Some serious work went into these conrods.
The crank is from a drag racer.
It must have been producing some serious power if thay had to pin the big ends.
I know that high horsepower engines can just spin a bearing as a matter of fact. No underlying reason other than massive power.
It's got ARP cap bolts too, so I'll reuse them.

[Pat Conlon]

It's got ARP cap bolts too, so I'll reuse them.

Chris, can Jonesy re-use the ARP cap bolts?
I thought once they were elongated by torque, they could not be re-used.

[fj1289]

It's got ARP cap bolts too, so I'll reuse them.

Chris, can Jonesy re-use the ARP cap bolts?
I thought once they were elongated by torque, they could not be re-used.

Pat, unfortunately I have no idea.  I don't know the tightening spec on them and whether or not they are torque to yield. I know I was supposed to buy a setup to measure rod bolt stretch for the Carrillos, but there are also "alternate" torque specs listed too.  I don't remember what I did when I put the big dragbike engine together - pretty sure I bought the jig to measure the bolt stretch though...

[Pat Conlon]

It's got ARP cap bolts too, so I'll reuse them.

Chris, can Jonesy re-use the ARP cap bolts?
I thought once they were elongated by torque, they could not be re-used.

Pat, unfortunately I have no idea.  I don't know the tightening spec on them and whether or not they are torque to yield. I know I was supposed to buy a setup to measure rod bolt stretch for the Carrillos, but there are also "alternate" torque specs listed too.  I don't remember what I did when I put the big dragbike engine together - pretty sure I bought the jig to measure the bolt stretch though...

Ok, thanks amigo....I found this FAQ for the ARP rod bolts:

Are ARP bolts and studs re-usable?
"....In the case of rod bolts, if any of them have taken a permanent set and have stretched by .001" or longer, you should replace them immediately. See page 29 in the catalog for more detailed information on this critical measurement...."
https://arp-bolts.com/p/faq.php
So the answer is yes, they can be reused if they have not stretched.

[fj1289]

I'm mostly curious about the part number suitable for XJR rods.  Looks like maybe some older Nissan or even Datsun rod bolts may be suitable?

[Indiana jones]

The ARP bolts are a perfect fit. Granted the last 2 mm need to be drawn into the cap when tightening them, an interference fit really, but only on the last 2mm.
I don't know the history of the bolts, so I'll just go with new standard ones.
I'm considering not using the lightened Crank in my Xjr1300 race engine build. I reckon I'll be better off sticking with my standard 10,000 mile standard crank and rods.
I might use it in a spare "bitsa" engine I'll be putting together.

[Indiana jones]

Well she and I made it onto track.
Couldn't have gone better.
The handling is sublime with perfect a Ktech front end and Ohlins rear.
Engine pulled strong with the dialled in Yoshi cams and Roger Upperton head.
Gave my Bsb superbike racing buddy a few laps on her too.
He was very impressed.
Success.
That's my CMR framed Honda too. Rs1000 replica with a Neate Racing Cb1173 engine.

[Troyskie]

Well done mate.

[fj1289]

Awesome!  Need to get someone to video so we can see and hear it run in anger!