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RC (Russ Collins) Engineering Cam specs?

  • Thread starter Thread starter rcp
  • Start date Start date
R

rcp

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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
 
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/showthread.php?t=135571

IMG_0721.jpg
 
Last edited:
Nessism said:
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/showthread.php?t=135571
Click to expand...

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
 
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.
 
jskellington said:
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.
Click to expand...

Super cool!: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.:D
 
F-375 is just the casting number. There should be other numbers stamped in it.
 
almarconi said:
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
Click to expand...

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.
 
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.
Click to expand...

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 said:
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.
Click to expand...

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.
 
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
 
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.
 
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.
 
jskellington said:
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.
Click to expand...


Thanks! I don't see your scan image, but that's the info I was looking for. Too lumpy for me, I'm afraid.

- Richard
 
Oh, if someone wants the RC515s, I can put you in touch with the seller. He was asking for offers.

- Richard
 
The catalog did not show up for me either.
Can you check your catalog for the cams i have.
RC-520E
exh. 460
int. 520
Do these numbers sound right?
Thanks in advance for any more info.
 
Yeah, sorry about the pdf. For some reason, I couldn't get it to stick to my message.

RC520 timing info:

Intake duration: 320 degrees
Exhaust duration: 328 degrees
Lobe centers: 115 degrees intake, 103 degrees exhaust
Lift: .460" intake; .408" exhaust
Lash: .006" intake; .012" exhaust
 
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