Author Topic: Identifying headwork (Read 3162 times)

dunlop44 · « **on:** March 27, 2013, 03:09:37 PM »

Hi all, first post ever!
I have a two heads that have had some work done to them. Problem is, I dont know exactly what was done. The ports dont look hogged out much, if at all. The combustion chamber looks possibly polished or smoothed out. Also, the valve springs dont look stock, and the keepers are red. Can anyone give me stock valve sizes so I can measure mine and compare? Thanks

Big Jay · « **Reply #1 on:** March 27, 2013, 04:26:07 PM »

If the "retainers" are red, it is really old school.

gschuld · « **Reply #2 on:** April 10, 2013, 04:48:38 PM »

Dunlop44,

32mm intake, 28mm exhaust.

Follow up question to those in the know...

So if you have a vintage ported head and the retainers are red anodized aluminum, who would have produced/sold them? Other than the obvious RC Engineering ...MTC, APE, Action fours, others? I have a set with no ID marks on them...

Also, who makes new retainers in red?

Thanks,

George

NitroHunter · « **Reply #3 on:** April 12, 2013, 06:37:33 PM »

Red anodized aluminum retainers were seconds from spelling disaster for me once.

Finding that was a serious wallet pucker factor moment, no kidding, 2 were hanging together by a thread!
And the ones that didn't split sure didn't look new after way too many redline trips.

gschuld · « **Reply #4 on:** April 12, 2013, 06:50:47 PM »

Interesting, do you know who made them?

MRieck · « **Reply #5 on:** April 12, 2013, 07:19:45 PM »

RC made the reds

Bill/BentON Racing · « **Reply #6 on:** April 12, 2013, 07:27:39 PM »

Have a couple used sets.....caveat emptor!! Bill

gschuld · « **Reply #7 on:** April 12, 2013, 09:13:43 PM »

Bill,

Caveat Emptor you say......Hmmm! So are the reds questionable because of quality of the product that RC put out or because they would be nearly 40 years old?

Mike,

Was RC the only supplier that you can think of that sold red retainers?

George

Jerry Rxman Griffin aka MuthaF'er · « **Reply #8 on:** April 12, 2013, 09:56:04 PM »

Aluminum retainers were light, not strong regardless of who made them.

gschuld · « **Reply #9 on:** April 12, 2013, 10:40:09 PM »

Ahhhh. I was just doing some reading regarding the aluminum vs Titanium vs steel retainers subject. I didn't realize that aluminum retainers were such a concern...

Good to know.

George

Bill/BentON Racing · « **Reply #10 on:** April 13, 2013, 02:07:16 PM »

Ti not bling or cheap,but well worth it!!

Bill

Medyo Bastos · « **Reply #11 on:** April 13, 2013, 02:14:53 PM »

wow, i have a couple of sets of red ones

Jerry Rxman Griffin aka MuthaF'er · « **Reply #12 on:** April 13, 2013, 04:01:07 PM »

Didn't say the aluminum wouldn't work. Lightest but weakest. I'd rather not use them (at least for many miles).

Retro Rocket · « **Reply #13 on:** April 13, 2013, 04:12:06 PM »

Quote from: Bill/BentON Racing on April 13, 2013, 02:07:16 PM

Ti not bling or cheap,but well worth it!! Bill

Yep Ti all the way...

CrazyRocketMan · « **Reply #14 on:** April 13, 2013, 05:17:14 PM »

I'm using Aluminum retainers in my build. My mechanic with 40+ years building world class race bikes says they will be fine. I'm not worried.

Retro Rocket · « **Reply #15 on:** April 13, 2013, 05:21:35 PM »

I see them as a weak link in a strong engine, for a stocker it probably wouldn't bother me , for the little extra cost it gives me piece of mind. I'll have over 5 grand in parts in my 1000cc engine, everything is top shelf....

Jerry Rxman Griffin aka MuthaF'er · « **Reply #16 on:** April 13, 2013, 05:35:19 PM »

Quote from: Retro Rocket on April 13, 2013, 05:21:35 PM

I see them as a weak link in a strong engine, for a stocker it probably wouldn't bother me , for the little extra cost it gives me piece of mind. I'll have over 5 grand in parts in my 1000cc engine, everything is top shelf....

+1

However if they are new and the holes are tight it would be a better situation.

CrazyRocketMan · « **Reply #17 on:** April 13, 2013, 05:46:45 PM »

I would not use old school Aluminum retainers. Technology was not there yet. Nowadays we have 7075 aircraft quality. The machining processes have changed. We know more about how heat and cold changes the strength and durability, Hard anodizing processes have changed a lot too. The modern Evo engine comes stock with Aluminum retainers that are stronger than and outlast titanium retainers.

I'm more concerned with my old school aluminum Yosh rods. But then again I've seen old race bikes torn down that still have them in them. Ken at CycleX told me over the phone he TRIED to break them in a test motor and couldn't.

I'm taking a risk I know. But we all take calculated risks. Advancement comes from hard work, ingenuity and risk.

We'll see. It will either blow up or it won't

Jerry Rxman Griffin aka MuthaF'er · « **Reply #18 on:** April 13, 2013, 05:58:35 PM »

I'm beginning to think you work for Boeing, Martin Marietta, et al!

I know some guys prefer new tech to old school and for good reason but especially and if those Yoshis are NOS I doubt you have anything to be concerned with. My Yoshi Daytona full race (road racing) cam was designed for Yoshi rods and to be full out most of the time. If I had a set I'd use them. I do have Carrillos in the new old tech 900 and a set of Crowers for my older tech brute 1000.

754 · « **Reply #19 on:** April 13, 2013, 07:18:59 PM »

Here is a timed out Yoshi..

CrazyRocketMan · « **Reply #20 on:** April 13, 2013, 07:38:15 PM »

No problem. Little JBWeld and shes as good as new!

CrazyRocketMan · « **Reply #21 on:** April 13, 2013, 07:41:16 PM »

Just looking at that pic makes my balls hurt.

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Author Topic: Identifying headwork (Read 3162 times)