Author Topic: Crane Camshaft for cb750 - anyone ever run one? (Read 6317 times)

corky · « **on:** March 01, 2017, 08:18:34 am »

Hey guys,

So I am working on building a 970 motor, and have the following cam as an option to run in it. Has anyone ran this cam, or seen it? I am curious to hear opinions on it. I am assuming it has 284 duration, and 400 lift.

Thanks,
Daniel

MRieck · « **Reply #1 on:** March 01, 2017, 09:33:16 am »

That's a large cam. Do the valves ever close?

gschuld · « **Reply #2 on:** March 01, 2017, 09:58:09 am »

And a pretty aggressive lobe profile compared to an old school big RC cam, the 454. The 454 cam has big rounded lobes, lowering valve train stress. Yours is not only large lift, but opened up longer with a quicker transition on the backside on the lobe. I'm thinking choose carefully with the springs, perhaps beehive springs?

I'd guess that cam, if indeed. 400 lift, was meant for very high compression and for a big bore race motor.

Is that your plan with this motor?

George

dragracer · « **Reply #3 on:** March 01, 2017, 10:08:24 am »

Wow, the overlap on that thing is crazy. Obviously this was a special grind for someone. Big cc's, big valves and big dollars went into that engine.

BPellerine · « **Reply #4 on:** March 01, 2017, 11:33:23 am »

I have a crane cam stamped 284 ho,does not look that big,was in a stock engine and the pistons showed the valves were just kissing the pistons.bill

corky · « **Reply #5 on:** March 01, 2017, 12:53:11 pm »

Thanks for the input everyone. I have another cam I will likely use. By the sounds of it, this one may be a little aggressive! I will look and see what info I have on it!

BPellerine · « **Reply #6 on:** March 01, 2017, 01:44:26 pm »

I cant seem to find info on crane cams.bill

Jerry Rxman Griffin aka MuthaF'er · « **Reply #7 on:** March 01, 2017, 02:58:36 pm »

Didn't Crane make the RC cams at least initially?

gschuld · « **Reply #8 on:** March 01, 2017, 03:27:24 pm »

Ed Iskinderian (Isky cams) was just a few doors down from RC Engineering's first shop in Gardena California. By all accounts, Russ worked directly with Ed to design and test cams for him. Before 1973, RC recommended Isky cams, and they were called the Isky 315 and Isky 327 cams, sound familiar?

Around early 1973, these cams became RC cams in the catalog. Presumably, Russ negotiated an exclusive for these cams, like he did with other suppliers (like Venolia, then Arias for pistons)

I assume that Isky supplied RC with cams going forward, but I really do not there know for sure. There were certainly continual developments going on with cams, as at least one change in profile/specs was made across their cam list.

George

754 · « **Reply #9 on:** March 01, 2017, 04:15:24 pm »

May have been Engle, i got a 315 with the other name on it .

Jerry Rxman Griffin aka MuthaF'er · « **Reply #10 on:** March 01, 2017, 06:28:57 pm »

That's it George. Thanks!

Don R · « **Reply #11 on:** March 01, 2017, 06:46:53 pm »

Quote from: 754 on March 01, 2017, 04:15:24 pm

May have been Engle, i got a 315 with the other name on it .

My 1124 welded stroker has an Engle cam.

corky · « **Reply #12 on:** March 02, 2017, 05:23:55 pm »

For comparison, here is another crane cam, next to a Norris R. I cannot find any info on these crane cams, and assume the 370-4, and the 400-8 is the grind number.

gschuld · « **Reply #13 on:** March 02, 2017, 06:55:02 pm »

Can you measure the lobe lift on intake and exhaust on both crane cams? I'd be interested to know the specs.

George

corky · « **Reply #14 on:** March 03, 2017, 08:56:05 am »

Just got the following info from Crane Cams. Thought it was really interesting, and will be neat to compare to RC cams.

corky · « **Reply #15 on:** March 03, 2017, 08:56:28 am »

cam #2 info

gschuld · « **Reply #16 on:** March 03, 2017, 10:21:26 am »

I wasn't able to open them for some reason.

George

BPellerine · « **Reply #17 on:** March 03, 2017, 01:17:32 pm »

could you get info on the 284h0 cam that I have?bill

Old Scrambler · « **Reply #18 on:** March 03, 2017, 03:17:59 pm »

Note the recommended 5000 rpm minimum on the fat 400 unit

BPellerine · « **Reply #19 on:** March 03, 2017, 04:37:36 pm »

more info than most cam makers give.bill

scottly · « **Reply #20 on:** March 03, 2017, 08:53:35 pm »

The 284* duration is at .050" valve lift; the advertised duration is 320*!!!!

754 · « **Reply #21 on:** March 03, 2017, 10:24:00 pm »

My 315 card says 310 degrees I think.. And they made two hotter cams than that model

MRieck · « **Reply #22 on:** March 04, 2017, 09:16:45 am »

Quote from: Old Scrambler on March 03, 2017, 03:17:59 pm

Note the recommended 5000 rpm minimum on the fat 400 unit

No sh!t......the valves never close. I wouldn't recommend that thing for the street (unless you start off with a ton of static compression).

bwaller · « **Reply #23 on:** March 04, 2017, 09:33:13 am »

Quote from: MRieck on March 04, 2017, 09:16:45 am

Quote from: Old Scrambler on March 03, 2017, 03:17:59 pm
Note the recommended 5000 rpm minimum on the fat 400 unit
No sh!t......the valves never close. I wouldn't recommend that thing for the street (unless you start off with a ton of static compression).

Add some giant carbs though Mike & it'll be perfect.

Camrector · « **Reply #24 on:** March 04, 2017, 10:30:53 am »

Quote from: bwaller on March 04, 2017, 09:33:13 am

Quote from: MRieck on March 04, 2017, 09:16:45 am
Quote from: Old Scrambler on March 03, 2017, 03:17:59 pm
Note the recommended 5000 rpm minimum on the fat 400 unit
No sh!t......the valves never close. I wouldn't recommend that thing for the street (unless you start off with a ton of static compression).

Add some giant carbs though Mike & it'll be perfect.

Watch out Waller is saucy today!

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Author Topic: Crane Camshaft for cb750 - anyone ever run one? (Read 6317 times)