RC (Russ Collins) Engineering Cam specs?

[rcp]

Does anyone know what an RC Engineering F-375 camshaft set for a GS1000 would be? Drag/roadrace/street suitable?

There's one for sale locally, but no details offered.

- Richard

[Nessism]

I think the F-375 is just the raw casting number and not the grind number. Not positive about this but I posted a similar question a while back and that's what I was told.

Check this thread for more info... http://www.thegsresources.com/_forum...d.php?t=135571

[rcp]

I think the F-375 is just the raw casting number and not the grind number. Not positive about this but I posted a similar question a while back and that's what I was told.

Check this thread for more info... http://www.thegsresources.com/_forum...d.php?t=135571

Thanks. I'll send a note off to see if I can get some measurements or further info from the seller.
That's some unpleasant surprises in your teardown there. Unfortunate.

-Richard

[Guest]

I am awaiting the arrival of an RC Engineering catalog I won in an ebay auction a few days ago; it may have the information you need. Stay tuned.

[Nessism]

I am awaiting the arrival of an RC Engineering catalog I won in an ebay auction a few days ago; it may have the information you need. Stay tuned.

Super cool! I'd love to properly ID my cams too. They have very near .400" lift but no clue about duration. Please hit me with a PM after you get the catalog.

[Guest]

F-375 is just the casting number. There should be other numbers stamped in it.

[almarconi]

They have very near .400" lift but no clue about duration.

Here is article that discusses camshaft basics which has tips on how to determine duration.

http://www.chevyhiperformance.com/techarticles/148_0307_basic_camshaft_info/index.html

[Nessism]

Here is article that discusses camshaft basics which has tips on how to determine duration.

http://www.chevyhiperformance.com/te...nfo/index.html

Guess I explained poorly in my post...

Should have said that I don't know what the duration and valve opening timing is, and don't own the specialized equipment it will take to measure it.

I have a nice dial indicator, but the total amount of travel is not great enough to measure cam lift. So a long travel dial indicator is needed, and a degree wheel. Might have to spring for these tools some day but don't want to spend the money right now.

[almarconi]

Should have said that I don't know what the duration and valve opening timing is, and don't own the specialized equipment it will take to measure it.

I have a nice dial indicator, but the total amount of travel is not great enough to measure cam lift. So a long travel dial indicator is needed, and a degree wheel. Might have to spring for these tools some day but don't want to spend the money right now.

Look at this setup

http://www.650motorcycles.com/isky.html

There was a post on this forum that had a link to a degree wheel that you could print out. I'll look and see it I can find it.

[almarconi]

Here is the link to the degree wheel

http://www.tavia.com/free_degree_wheel.html

Here is an article on cam timing that may be helpful

http://medlem.spray.se/biker661/Camtiming.htm

[Nessism]

Look at this setup

http://www.650motorcycles.com/isky.html

There was a post on this forum that had a link to a degree wheel that you could print out. I'll look and see it I can find it.

I love those XS650 guys, they really get down and dirty with their engines including pressing cranks together/apart and even doing their own valve jobs.

I used to own a degree wheel but can't find it anymore. Your link shows an Iskenderian wheel - those guys are super cool. Not sure if they are still there but Isky's shop was very near where I used to work and I would go in there all the time to buy stuff and use their free valve spring tester. Not many places like that around any more.

[rcp]

Markings on the local ones are F-375 and RC 515. Didn't get any measurements from the seller. If that's enough for anybody to ID them, I'd appreciate it.

Thanks,
Richard

[almarconi]

This may be of some help

http://www.satanicmechanic.org/rccam.shtml

[Guest]

Hey RCP,

According to the previous owner of my 1978 GS1000, I've got what was called the Russ Collins Stage Two package, circa 1979. Bored to 1173, box-forged pistons, high-lift cam, ported and polished, 29 mm smoothbores, electronic ignition, high output coils, etc. Nice work by RC. Coming on 30 years old and still way too fast for me, or the suspension.

As I recall, I saw the inscription .515 RC on the intake camshaft. We may have a similar setup, but I'll definitely post more info when I get the catalog, and post pictures when I do the valve check in a couple of weeks.

[Guest]

Got the Russ Collins catalog today. It appears I have the Stage III package on my 1000, which means bored to 1176, not 1173. I feel like a better man . . .

The RC515 Pro Stock Special cam:

Total duration: 310 degrees

Lobe centers: 108 degrees

Lift: .424 in. intake; 424 in. exhaust

Lash: .004 in. intake; .006 in. exhaust.