Author Topic: Some pics of 2 heads I ported.... (Read 6504 times)

MRieck · « **on:** January 20, 2006, 03:02:17 PM »

...fresh from the machine shop. One is a stage 1 and the other is stage 2...there is one more stage available

. Both of the owners are members here. If any is seriously interested in this kind of work please let me know.
Mike

Bob Wessner · « **Reply #1 on:** January 20, 2006, 03:07:31 PM »

Hmm, still working towards a level of competency that would allow me to get AT the ports for you to work on.

Raul CB750K1 · « **Reply #2 on:** January 20, 2006, 03:14:45 PM »

Mike, do you have pictures of the "before"? To be honest, I can tell the difference as I've never seen a head before porting.

Raul

harpo · « **Reply #3 on:** January 20, 2006, 06:04:51 PM »

Hi Mike,
Looks really good. Is the top picture the intake and the bottom picture the exhaust? Did you just clean the casting up? Do you think on the intake port if you pin punched in a circle diameter, would this help atomize the fuel better? I have done port work on racing motors before, but it was always experimental. Also, what kind of cam would you run with that for the street?
Jack

MRieck · « **Reply #4 on:** January 20, 2006, 06:29:10 PM »

Quote from: Raul CB750K1 on January 20, 2006, 03:14:45 PM

Mike, do you have pictures of the "before"? To be honest, I can tell the difference as I've never seen a head before porting.

Raul

I think I can rustle up a before pic or 2 Raul.

MRieck · « **Reply #5 on:** January 20, 2006, 06:46:22 PM »

Quote from: harpo on January 20, 2006, 06:04:51 PM

Hi Mike,
Looks really good. Is the top picture the intake and the bottom picture the exhaust? Did you just clean the casting up? Do you think on the intake port if you pin punched in a circle diameter, would this help atomize the fuel better? I have done port work on racing motors before, but it was always experimental. Also, what kind of cam would you run with that for the street?
Jack

From what I have read and experiences there is no evidence that supports a rough finish produces better atomization. Jerry Branch's work in the 60's and 70's shows that the air/fuel mixture basically doesn't even touch the walls of the port and very, very little atomization occurs until the end of the compression cycle. Personally I think alot of rough finish port guys say it is the best because you eliminate alot of finish work and charge the same price.

In general I recommend a Megacycle 125-65 cam as it has good lift without to much duration that provides nice acceleration and retains good bottom end. It is also not to hard on the rocker arms. A 125-75 or Harman F grind is good also.

Quote

MRieck · « **Reply #6 on:** January 20, 2006, 06:51:00 PM »

Quote from: Raul CB750K1 on January 20, 2006, 03:14:45 PM

Mike, do you have pictures of the "before"? To be honest, I can tell the difference as I've never seen a head before porting.

Raul

Here you go Raul.

750goes · « **Reply #7 on:** January 21, 2006, 12:16:21 AM »

On the first lot of photos, has any material been polished off the exhaust to make it a larger diameter?? or is this just the impression because it is so clean, and what is the blue stuff

how did you get those heads that clean

and how did you get photos of my intake and exhaust in the second lot of photos?

on second glance, sorry not mine, mine look much worse than that....

MRieck · « **Reply #8 on:** January 21, 2006, 05:47:55 AM »

Quote from: 750goes on January 21, 2006, 12:16:21 AM

On the first lot of photos, has any material been polished off the exhaust to make it a larger diameter?? or is this just the impression because it is so clean, and what is the blue stuff

how did you get those heads that clean

and how did you get photos of my intake and exhaust in the second lot of photos?

on second glance, sorry not mine, mine look much worse than that....

Yes,material has been removed from the exhaust port. The blue stuff is Dykem (machnists dye). I put it on so I can match the port exit to the exhaust gasket ID. The heads are hot tanked and bead blasted. As for the third question....... hmmmmmmmm- must be my mystical powers.

scondon · « **Reply #9 on:** January 21, 2006, 12:07:03 PM »

Thanks for posting the pics, Mike. Gotta say that the close up shots of the ports and valve seats don't show the complete story of the work you do. I send ya crusty, oily, beat looking heads and you send back a head that I don't even recognize. EVERYTHING clean and inspected and any trouble spots either fixed or pointed out. Ready to paint or just bolt straight on. I've got two machine shops nearby that do good work and they will do exactly what I tell them, but they don't know the ins/outs of these motors and I am grateful for the peace of mind I get from having you do the work. I can't fathom the idea of going through the trouble and expense of rebuilding a 30 year old motor, boring out cylinders, and then cutting costs by skimping on the headwork.

Raul CB750K1 · « **Reply #10 on:** January 21, 2006, 02:27:23 PM »

Hey Mike, that is really a big difference. How do you clean those ports? Just with the hot tank, or do you use a soft wire wheel inside? Feel free to share your secrets as long as you don't have to kill me afterwards... ;-)

I haven't ported my CB350 resto's head. They were slightly cleaner than the ones in your picture, and as it is nothing but a workhorse I just left them like they were. But rest assured that, when the day comes to rebuild my CB750 engine, I will consider to send you the head -the engine's head, I mean-. If shipping would not be so expensive...

Raul

MRieck · « **Reply #11 on:** January 21, 2006, 03:22:26 PM »

Quote from: scondon on January 21, 2006, 12:07:03 PM

Thanks for posting the pics, Mike. Gotta say that the close up shots of the ports and valve seats don't show the complete story of the work you do. I send ya crusty, oily, beat looking heads and you send back a head that I don't even recognize. EVERYTHING clean and inspected and any trouble spots either fixed or pointed out. Ready to paint or just bolt straight on. I've got two machine shops nearby that do good work and they will do exactly what I tell them, but they don't know the ins/outs of these motors and I am grateful for the peace of mind I get from having you do the work. I can't fathom the idea of going through the trouble and expense of rebuilding a 30 year old motor, boring out cylinders, and then cutting costs by skimping on the headwork.

Thank you Sean. You are not afraid to spend some money and I truly appreciate it. I will always give any head sent to me the best service possible as well as honest assessment. I should take a pic of my workshop now....there are 6 CB heads sitting there in various stages of completion.

MRieck · « **Reply #12 on:** January 21, 2006, 03:27:06 PM »

Quote from: Raul CB750K1 on January 21, 2006, 02:27:23 PM

Hey Mike, that is really a big difference. How do you clean those ports? Just with the hot tank, or do you use a soft wire wheel inside? Feel free to share your secrets as long as you don't have to kill me afterwards... ;-)

I haven't ported my CB350 resto's head. They were slightly cleaner than the ones in your picture, and as it is nothing but a workhorse I just left them like they were. But rest assured that, when the day comes to rebuild my CB750 engine, I will consider to send you the head -the engine's head, I mean-. If shipping would not be so expensive...

Raul

Don't worry about the shipping Raul..it's not that bad..concentrate on the product. Anybody that still loves these bikes are my personal friend even though I probably will never meet them. All you guys are the best....plain and simple. BTW...The heads are hot tanked and bead blasted(with all threaded holes closed with bolts).

750goes · « **Reply #13 on:** January 21, 2006, 05:34:41 PM »

Please forgive my dumbness, what does HOT TANKED mean, because anything I can do to get my head looking half way decent would be a huge improvement (the bike I'm talking about)..

thanks for your pictures, it shows what a fine craftsman you are....does that get me any brownie points?

Lumbee · « **Reply #14 on:** January 21, 2006, 07:24:48 PM »

...so M, what is the going rate for a complete over haul of a head? Porting with new valve guides and all?

MRieck · « **Reply #15 on:** January 21, 2006, 08:25:56 PM »

Quote from: 750goes on January 21, 2006, 05:34:41 PM

Please forgive my dumbness, what does HOT TANKED mean, because anything I can do to get my head looking half way decent would be a huge improvement (the bike I'm talking about)..

thanks for your pictures, it shows what a fine craftsman you are....does that get me any brownie points?

Spun in hot detergent. You are half way there.

MRieck · « **Reply #16 on:** January 21, 2006, 08:27:02 PM »

Quote from: The great "Lumbee" on January 21, 2006, 07:24:48 PM

...so M, what is the going rate for a complete over haul of a head? Porting with new valve guides and all?

PM me sir.

Sam Green Racing · « **Reply #17 on:** November 14, 2006, 05:36:50 PM »

Just saw this thread linked from another, well worth another read.

Sam.

MRieck · « **Reply #18 on:** November 14, 2006, 05:43:34 PM »

I think the Stage 1 pics got lost Sam

??

Sam Green Racing · « **Reply #19 on:** November 14, 2006, 05:48:05 PM »

MRieck · « **Reply #20 on:** November 14, 2006, 07:00:13 PM »

Quote from: scondon on January 21, 2006, 12:07:03 PM

Thanks for posting the pics, Mike. Gotta say that the close up shots of the ports and valve seats don't show the complete story of the work you do. I send ya crusty, oily, beat looking heads and you send back a head that I don't even recognize. EVERYTHING clean and inspected and any trouble spots either fixed or pointed out. Ready to paint or just bolt straight on. I've got two machine shops nearby that do good work and they will do exactly what I tell them, but they don't know the ins/outs of these motors and I am grateful for the peace of mind I get from having you do the work. I can't fathom the idea of going through the trouble and expense of rebuilding a 30 year old motor, boring out cylinders, and then cutting costs by skimping on the headwork.

In rereading your post Sean...I have to say thank you again! !

uny2 · « **Reply #21 on:** November 15, 2006, 08:41:32 AM »

MRjeck,

Do you do head fin repair? See picture of my 70' Sandcast head with broken fins. Previous owner was attempting to do some type of repair.

ED

MRieck · « **Reply #22 on:** November 15, 2006, 01:54:35 PM »

Sorry I don't.

jtb · « **Reply #23 on:** November 15, 2006, 04:09:04 PM »

Hey Mike, mine runs great! Thanks for your help.

John

Jerry Rxman Griffin aka MuthaF'er · « **Reply #24 on:** November 15, 2006, 08:05:59 PM »

Quote from: uny2 on November 15, 2006, 08:41:32 AM

MRjeck,

Do you do head fin repair? See picture of my 70' Sandcast head with broken fins. Previous owner was attempting to do some type of repair.

ED

Ed,
I was at a welder this morning looking to have fins on a cylinder repaired. His solution was to build up the aluminum with his TIG welder then reshape them.

News:

Author Topic: Some pics of 2 heads I ported.... (Read 6504 times)

harpo

uny2