Author Topic: RC Engineering 1075 stroker motor value? (Read 4731 times)

gschuld · « **Reply #25 on:** February 07, 2016, 02:33:46 pm »

Right, good point. I have seen that too... just not on mine.

George

754 · « **Reply #26 on:** February 07, 2016, 02:45:04 pm »

Might be Isky..it may be the one that I srewed up a few lobes on.. Bought it in 78 I Think.
Here was a big cam grinder just down the street from RC.. So I assumed Russ designed them and got them to do the production.

gschuld · « **Reply #27 on:** February 07, 2016, 02:52:02 pm »

Early RC articles, pre 1974, referenced RC recommending Isky cams, and mentioned both a 315 and 327. RC may well have designed or helped design them, but before they were RC 315 and 327 they were Isky cams.

George

mrcheeze · « **Reply #28 on:** February 07, 2016, 03:05:46 pm »

Man, I really wish I hadn't dropped the head and cyls off at the machine shop already... I didn't see any obvious marks but then again the PO rattlecanned the engine with crinkle paint so it was hard to see much of anything.

and either way I suppose my cam is not actually an RC cam then huh?

gschuld · « **Reply #29 on:** February 07, 2016, 03:25:36 pm »

I have seen the RC stampings hidden under heavy paint before. Did you check the other end of the cam? RC stamped them on the other side sometimes. I have some either way. It's DEFINITELY a vintage blank, not a regrind, cam regardless.

mrcheeze, great name BTW

George

gschuld · « **Reply #30 on:** February 07, 2016, 03:28:09 pm »

Quote from: 754 on February 07, 2016, 02:45:04 pm

Might be Isky..it may be the one that I srewed up a few lobes on.. Bought it in 78 I Think.
Here was a big cam grinder just down the street from RC.. So I assumed Russ designed them and got them to do the production.

If you bought it new ftom RC in 1978, it certainly shouldn't be stamped ISKY. That stopped about 1973. And by 1978 the revised cam specs were well in place.

George

754 · « **Reply #31 on:** February 07, 2016, 06:44:57 pm »

Not sure bought two more in the last few years, might be one of them..

gschuld · « **Reply #32 on:** February 07, 2016, 06:58:39 pm »

Well, dig it out when you get a chance...

grcamna2 · « **Reply #33 on:** February 07, 2016, 07:10:33 pm »

Quote from: mrcheeze on February 07, 2016, 08:57:42 am

Hello Everyone,

About a year ago i bought out a gentleman's collection of CB750 stuff, which included a wrecked amen-framed chopper with damaged Fury 10" front end with an alleged 1075 big bore (as well as an alleged 836 motor on the side and a few more parts motors). I took the engine out and set it aside, not really believing it was what he said it was.

well, I opened it up the other day and I'll be damned it appears to be a fully built RC Engineering 1075 Stroker. The moment I saw the Golden rods I stopped what I was doing. The insides are minty fresh and the piston tops wiped clean with a cloth. There are barely any indentations on the cam chain rollers and absolutely no wear on the cam or rockers. Cross hatching is still visible on the barrels, but I have already taken them to get rehoned and dropped the head off for cleaning and inspection as well. I also still have the previous owner's contact information so chasing down the chain of custody may still be possible as well.

so, given all that, what do you all think a fair price would be for this engine? As much as I want to run an engine made entirely out of unobtanium I am building a chopper and a cafe and have little interest in vintage drag racing, so I would much rather see this engine go to someone that will run the dogsnot out of it.

Opinions?

Welcome to the forum

MRieck · « **Reply #34 on:** February 08, 2016, 02:49:03 pm »

Oh boy......Sherman and Mr Peabody are about to step out of the WABAC time machine.

bear · « **Reply #35 on:** February 08, 2016, 04:32:53 pm »

bwaller · « **Reply #36 on:** February 08, 2016, 05:42:32 pm »

Oh what a #$%* disturber, hahahaha!

Bill/BentON Racing · « **Reply #37 on:** February 08, 2016, 06:01:39 pm »

Subscribed!!!

mrcheeze · « **Reply #38 on:** February 09, 2016, 08:27:16 am »

Oh Guys...

RC454

B194

gschuld · « **Reply #39 on:** February 09, 2016, 08:42:06 am »

That's wierd. I just recently made a deal for two separate 454 cams. They don't come around very often, but at the same time, I can't think of anyone who had actually decided to run one since, like, forever.

That is a very aggressive cam, RC didn't even use them on their record setting bikes. And to be honest, I haven't gotten any solid feedback regarding what, specifically, kind of engine combination that cam was designed for.

George

754 · « **Reply #40 on:** February 09, 2016, 10:03:58 am »

Serious cam, they dont even publish the specs.. Font be afraid to show us the lobes or measure them..

gschuld · « **Reply #41 on:** February 09, 2016, 10:11:33 am »

754,

RC dropped the mystery for the 78 catalog. Then there is the matter of the RC 404 cam...

George

PeWe · « **Reply #42 on:** February 09, 2016, 11:08:28 am »

Quote from: mrcheeze on February 09, 2016, 08:27:16 am

Oh Guys...

RC454

B194

This is mechanical porn!
Lets see the lobes from side, the 454 stamped side, the other too so the lobes will show the duration,lift and overlap.
I like big boobs... hmmm ... I mean lobes.

grcamna2 · « **Reply #43 on:** February 09, 2016, 11:19:23 am »

I think mrcheeze has a high rev

drag race engine there. Do you have any pics of the ports ?

mrcheeze · « **Reply #44 on:** February 09, 2016, 11:38:50 am »

Quote from: grcamna2 on February 09, 2016, 11:19:23 am

I think mrcheeze has a high rev drag race engine there. Do you have any pics of the ports ?

this is the only pic of the intake port... I think its had a wee bit of work done to it.

PeWe I'll go get some better shots of the lobes for you.

mrcheeze · « **Reply #45 on:** February 09, 2016, 11:46:58 am »

Also one of my first indications that something was really special was the port job... It was notably consistent between the cyls and all 4 smooth to the touch with no waves or dips. whoever ported it did a first rate job.

grcamna2 · « **Reply #46 on:** February 09, 2016, 12:18:52 pm »

That looks good

Big Jay · « **Reply #47 on:** February 09, 2016, 11:26:44 pm »

I believe Luther Iskenderian was grind the RC cams at the Isky shop. Also Babe Erson may have done them too.

The retainers look like titanium. I have never seen an RC motor with Ti retainers. ( altho the triple and the Sorcerer will now have them).

gschuld · « **Reply #48 on:** February 10, 2016, 04:25:57 am »

Jay,

I had a set that I was convinced were titanium until they were weighed. I have seen several sets of old clear anodized aluminum retainers that had the clear anodizing fade just enough to give it that titanium tone. Anyway, he'll know for sure with a good gram scale.

RC was selling titanium retainers by at least 1976 (76 catalog in the picture) but yes those red RC retainers seem to be the typical ones found in RC motors.

I believe that Ed Iskendarian's shop was just a few doors down from RC's original shop in Gardenia, Ca. Several early 70s magazine articles featuring RC Engineering specifically mentioned RC recommending Iskendarian's cams.

My assumption is that Russ and Ed worked together early on to develop the design of the cams. RC had the chassis and bench dynos for constant testing, Luther had the cam experience and equipment. I'm pretty sure a deal was made by about 1973(or earlier) to have RC exclusively sell these cams under the RC name.

The photos below are from different articles on the SAME Dec 1973 Big Bike magazine. The Adams (RC Engineering built) double was built in late 1972, in the black background. I'm guessing the cam was labeled as an ISKY 315 cam as it was still being sold under the ISKY name in mid/oate 1972, but an exclusive deal was finalized in 1973 as from then on it became the RC 315.

George

gschuld · « **Reply #49 on:** February 10, 2016, 06:30:54 am »

mrcheeze,

Here is an example of a set of original RC red anodized retainers and a set of titanium retainers. As you can see, there is a SUBSTANCIAL difference in weight. If you have an accurate gram scale handy, throw your whole set on and compare your numbers with these below to let you know for sure what you have. Both sets of retainers came off big bore hipo engines that had a SUBSTANCIAL amount to of RC components in them, and both with RC stamped and ported heads. I measured the angles and shapes of both the RC reds and the titanium retainers, and the shapes and dimensions matched up perfectly. I have seen different shapes of retainers between suppliers, some minor, some significant. So though it's very possible that these titanium retainers were RC supplied, there is no way to be sure.

George

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Author Topic: RC Engineering 1075 stroker motor value? (Read 4731 times)