Author Topic: Rod Weights for CB 750 racing rods. (Read 8276 times)

754 · « **on:** August 01, 2012, 11:20:33 PM »

Anyone got the weights for the APE Croweres, or the Carillos?

Yoshi aluminum is 239 grams
RC Goldenrod is 301 grams

Just wondering what the steel ones weigh in at?

Jerry Rxman Griffin aka MuthaF'er · « **Reply #1 on:** August 01, 2012, 11:59:40 PM »

If I remember correctly -

Crowers are ~ 375gm
Carrillos are ~ 320gm

Too late to go to the basement and weigh a Crower. Carrillos are in the engine.

754 · « **Reply #2 on:** August 02, 2012, 07:45:27 AM »

Yes, I saw a Crower that was at 376 grams.

voxonda · « **Reply #3 on:** August 02, 2012, 10:26:09 AM »

I want these Yoshi's!!!

please?

Big Jay · « **Reply #4 on:** August 02, 2012, 04:05:57 PM »

Carrillos 312, Super Rods 370

754 · « **Reply #5 on:** August 02, 2012, 09:28:20 PM »

Anyone got a weight for the Cycle X rods?

Retro Rocket · « **Reply #6 on:** August 02, 2012, 09:32:18 PM »

Quote from: 754 on August 02, 2012, 09:28:20 PM

Anyone got a weight for the Cycle X rods?

Super Rods 370......

jaguar · « **Reply #7 on:** August 03, 2012, 12:24:45 PM »

I have a set of RCS rods ill weigh

The RCs are billet and the Yoshi are forged?
I thought I read something saying no one had broken an RC rod? Does that mean they dont stretch like other alloy rods?

754 · « **Reply #8 on:** August 03, 2012, 09:22:43 PM »

Goldenrods are billet aluminum.. most Aluminum rods are forged, and if you dont know the history of them, can have an unknown life expectancy. Forged aluminum rods are subject to stress corrossion, and can deteriorate over time. I have a set of Goldenrods, they guy I got them from said he had heard of one failing, but it had been run hard for a long time..
Goldenrods held up to 200-300 hp, so at 80 or maybe 100 hp, I will take my chances.. after splitting a set of 69 cases apart, and finding 20 pieces of a Yoshi rod, I got no desire to complete that set of 3 rods..

What are RCS rods ?

Jerry Rxman Griffin aka MuthaF'er · « **Reply #9 on:** August 03, 2012, 11:30:33 PM »

RCS are more than ONE RC rods Frank.

The REAL question pertaining to RC rods is: which ones? Peened, peened and bushed or Golden? Now with that being said - peened should weigh the same as stock Honda, peened and bushed MAY weight the same as Honda provided the bushes weigh the equivalent of the amount of material removed in the little end to bush and Golden, we all know they have the weight of aluminum and not gold.

jaguar · « **Reply #10 on:** August 04, 2012, 06:33:24 AM »

Sorry typo
RSC

BLUE71TURBO · « **Reply #11 on:** August 04, 2012, 11:32:43 AM »

MTC ALUMINUM rods. In my opinion the best cb750 aluminum rods made.

MRieck · « **Reply #12 on:** August 04, 2012, 12:55:45 PM »

Falicon also made 2 piece aluminum rods for the 750.

Greggo · « **Reply #13 on:** August 04, 2012, 01:25:35 PM »

Quote from: BLUE71TURBO on August 04, 2012, 11:32:43 AM

MTC ALUMINUM rods. In my opinion the best cb750 aluminum rods made.

Are those the same as the MC Engineering ones? They look exactly the same, but have a different brand name on them.

754 · « **Reply #14 on:** August 04, 2012, 01:42:57 PM »

Blue 71, are you running MTC in your turbo? if you are how long have they been in use?

MRieck · « **Reply #15 on:** August 04, 2012, 04:09:43 PM »

Quote from: Greggo on August 04, 2012, 01:25:35 PM

Quote from: BLUE71TURBO on August 04, 2012, 11:32:43 AM
MTC ALUMINUM rods. In my opinion the best cb750 aluminum rods made.

Are those the same as the MC Engineering ones? They look exactly the same, but have a different brand name on them.

No. The later MTC had small end bushings....they always doweled the cap (except in those really early ones I'd guess). Falcon did the same and were better than the MTC IMO but that was when Falicon was owned by he man that started the company. Still.......I would not trust an aluminum rod for long periods of time. The difference on the street is not worth it.....I'd always go with a Carrillo or good steel rod.

BLUE71TURBO · « **Reply #16 on:** August 04, 2012, 05:59:14 PM »

Quote from: 754 on August 04, 2012, 01:42:57 PM

Blue 71, are you running MTC in your turbo? if you are how long have they been in use?

No, i'm running a special steel set from R.C. Engineering. I bought them from an old friend that picked them up from the man himself. They are not factory modified rods. They are larger.

MRieck is right. Aluminum rods are not for street use. They are for racing and to be changed out often.

BLUE71TURBO · « **Reply #17 on:** August 04, 2012, 06:11:33 PM »

Quote from: 754 on August 01, 2012, 11:20:33 PM

Anyone got the weights for the APE Croweres, or the Carillos?

Yoshi aluminum is 239 grams
RC Goldenrod is 301 grams

Just wondering what the steel ones weigh in at?

My MTC rods weigh in at 260 grams each.

bear · « **Reply #18 on:** August 04, 2012, 10:16:58 PM »

MRieck is right. Aluminum rods are not for street use. They are for racing and to be changed out often.

[/quote]

It can be narrowed down a bit further than that in my opinion.
They are for drag racing only, anybody running alloy rods in a road racing or speedway motor are asking for trouble.
Good quality alloy rods can certainly sustain high loads but suffer fatigue issues from sustained use.

Cheers,
Brian

Big Jay · « **Reply #19 on:** August 06, 2012, 07:04:08 PM »

Quote from: BLUE71TURBO on August 04, 2012, 11:32:43 AM

MTC ALUMINUM rods. In my opinion the best cb750 aluminum rods made.

Hands down.

Big Jay · « **Reply #20 on:** August 06, 2012, 07:05:46 PM »

Quote from: Greggo on August 04, 2012, 01:25:35 PM

Quote from: BLUE71TURBO on August 04, 2012, 11:32:43 AM
MTC ALUMINUM rods. In my opinion the best cb750 aluminum rods made.

Are those the same as the MC Engineering ones? They look exactly the same, but have a different brand name on them.

No. MTCs were made in the USA by MTC from Alcoa forgings

MC rods were made either in Japan or Tiawan.

MRieck · « **Reply #21 on:** August 08, 2012, 08:26:38 AM »

No bearing dowels in those caps?

BLUE71TURBO · « **Reply #22 on:** August 08, 2012, 02:16:22 PM »

Quote from: MRieck on August 08, 2012, 08:26:38 AM

No bearing dowels in those caps?

I'll have to dig mine out and check. The picture i posted is not of my rods. I snatched that off of the internet.

City Boy · « **Reply #23 on:** August 08, 2012, 09:29:03 PM »

Hi gang.A question.I have learned from many sources that alum. rods are not for street or road racing purposes.I have the RC golden rods in my Cobra unit and it is always a wonder if I have made a mistake in using them.My question for discussion is two fold,First,Yoshimura sold aluminum rods which I had used when my engine was first built as an 812 with Daytona cam.That company was only interested in road racing as far as I know yet they specked these rods with no mention of change out intervals.Any thoughts on why?Second,all the Norton,Triumph,and BSA engines I have seen apart had aluminum rods and I had not heard of rod failures being a particular issue nor that they had to be replaced at any interval.Any thoughts people? My crankcases are wondering as am I. Rock On

Big Jay · « **Reply #24 on:** August 09, 2012, 12:09:47 AM »

There is a certain fatigue factor that can occur in aluminum rods. However, there are literly hundreds of CBs running out there with MTCs , Golden rods, MCs, etc for over 30 years.

One of the less desirable aspects of aluminum rods is rod stretch. You usually have to run more piston to head clearance with them.

Those Yosh rods were made by a company in Calif that is no longer in business, SuperRod. Their main advantage was they were stronger than the oem steel rods, but not as strong as Golden rods or MTCs.

At some point in the late 70s, Jim at Action Fours had a steel rod made in Japan that was beefier than oem rods. He sold them to us and RC Eng.

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Author Topic: Rod Weights for CB 750 racing rods. (Read 8276 times)