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Author Topic: My piston project(s).  (Read 20851 times)

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Offline Pinhead

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Re: My piston project(s).
« Reply #25 on: January 10, 2010, 03:28:51 PM »
Quote from: traveler on January 09, 2010, 07:13:16 PM
Work that head.....the power you are getting from this will go up 10-12% I estimate. ;)

~Joe


Are you estimating according to pure displacement increases? Or taking into consideration displacement and compression? Hate to say it, but I know you're not taking into consideration the Surface Turbulence, as I can guarantee you have no experience with it. This will be the main source of increased efficiency and power.
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Doug

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Offline Soos

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Re: My piston project(s).
« Reply #26 on: January 11, 2010, 06:30:01 PM »
hey pinhead read the "gentleman's express article, regarding the use of over sized pistons with little/no head-work.

Basically states highly ported motors get the extra HP, but only at narrow top end bands, and the un-ported bike will experience the power gain through the whole power band.
Pinhead is after MPG more than raw HP I believe anyway.

Now for the MAX. power, there is nothing like the holy trinity of:
a properly timed hot cam
big pistons
a good head job

 ;D ;D ;D
l8r


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Offline Retro Rocket

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Re: My piston project(s).
« Reply #27 on: January 11, 2010, 06:33:44 PM »
+1 on the head job..... ;D

Mick
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Offline Pinhead

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Re: My piston project(s).
« Reply #28 on: January 11, 2010, 11:58:14 PM »
And yes, I am aiming for increased MPG.
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Doug

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By the way, I'm going for the tinfoil pants...so they can't read my private thoughts.
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Offline cdoggy81

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Re: My piston project(s).
« Reply #29 on: January 12, 2010, 02:53:06 PM »
Interested as well as to what you can do for the cb550 pistons :)
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Offline Soos

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Re: My piston project(s).
« Reply #30 on: January 12, 2010, 04:55:21 PM »
I will be starting a thread in services offered for this very item soon.
Glad to know there is a want/need for this :)


still waiting on material for more fixtures, must be shipped from china by tortoise.

l8r
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Just think to yourself what would Alowishus Devander Abercrombie do?
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Offline Soos

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Re: My piston project(s).
« Reply #31 on: January 15, 2010, 06:46:23 PM »
And the material has arrived :)


Been boring cylinders too.
The conversations that have been started the past week have been interesting.
One guy thought I kept cutting the same set, and asked if I had broke through the piston yet.never mind that I have 4 sets.
Pinhead, the grooves... that is an interesting looking set of pistons.



Most ask "why bother?"
I tell them why not?
:)




l8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Pinhead

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Re: My piston project(s).
« Reply #32 on: January 16, 2010, 06:58:39 AM »
Quote from: Soos on January 15, 2010, 06:46:23 PM
And the material has arrived :)


Been boring cylinders too.
The conversations that have been started the past week have been interesting.
One guy thought I kept cutting the same set, and asked if I had broke through the piston yet.never mind that I have 4 sets.
Pinhead, the grooves... that is an interesting looking set of pistons.



Most ask "why bother?"
I tell them why not?
:)




l8r

:D Can't wait! Do you suppose you could post some pics so I can show off your work?
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Doug

Click --> Cheap Regulator/Rectifier for any of Honda's 3-phase charging systems (all SOHC4's).

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Quote from: TwoTired
By the way, I'm going for the tinfoil pants...so they can't read my private thoughts.
:D

Offline Soos

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Re: My piston project(s).
« Reply #33 on: January 17, 2010, 10:25:46 AM »
I will not any have pics until I am done unfortunately.
Not taking the camera to work, and really hate transporting pistons unless I need to.


They are interesting looking though.
PM sent BTW.....





I have had to re-do my mill setup, and am going a bit more universal with this one.
Being able to un-clamp, and swap out the lathe fixture for the mill pocket operations has been on my mind.
I have finally came up with what I think is the easiest/most reliable I can do without any problems as to repeatability. SO only one more fixturing project to finish before the valve pockets are to be done.
I should have pictures by next weekend.



l8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Pinhead

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Re: My piston project(s).
« Reply #34 on: January 18, 2010, 01:59:52 AM »
I didn't get a PM...
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Doug

Click --> Cheap Regulator/Rectifier for any of Honda's 3-phase charging systems (all SOHC4's).

GM HEI Ignition Conversion

Quote from: TwoTired
By the way, I'm going for the tinfoil pants...so they can't read my private thoughts.
:D

Offline Soos

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Re: My piston project(s).
« Reply #35 on: January 29, 2010, 03:15:39 PM »
Well, the mill at work is up and running again.


Started on the mill fixture, and will be finishing it monday morning.
Valve pockets will be done soon.




l8r
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Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Kemp

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Re: My piston project(s).
« Reply #36 on: January 29, 2010, 06:33:01 PM »
This is good. I've acquired a set of 64mm Kawasaki 650 pistons for my (hope for) 550/673 conversion. Will be interesting to see what your results might be as this could be quite cost effective in dollar per horsepower.
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Offline Soos

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Re: My piston project(s).
« Reply #37 on: January 30, 2010, 12:02:13 PM »
64?? mm Kawasaki 650 pistons??
Not 62mm?(the Kz650 pistons I have are 62mm is why I ask)
What year/make model they from?


IF they are the same KZ650 pistons I have, they might not be applicable for a 550.
(unless you are running a cb650 head that is)



l8r
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Just think to yourself what would Alowishus Devander Abercrombie do?
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(61mm)652cc 1979 cb650

Offline Soos

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Re: My piston project(s).
« Reply #38 on: January 30, 2010, 12:03:10 PM »
Now that the mill is going, I am stoked about getting time to finish machining the other lathe fixtures for the other sized pistons soon!!



l8r
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Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Kemp

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Re: My piston project(s).
« Reply #39 on: February 01, 2010, 08:35:40 PM »
Yeah, the Kawasaki pistons are actually 62mm. I believe this is the most you can safely bore the CB650 cylinder before going to 750 liners.
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Offline Soos

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Re: My piston project(s).
« Reply #40 on: February 02, 2010, 04:04:23 PM »
Yup, your are right on the 62mm limit.
I have a post in the services offered area for piston machining.




Anyways, the fixture for the mill is done, and working well.
I have had to re-tool a bit, and re-designed my piston holders to accommodate the fixtures jaw height.


One thing remains mainly now.
I need to properly locate the center of the valve reliefs on the stocker cb650 pistons, position a locating dowel pin on the mill fixture, and writing a little program to circle interpolate the valve pockets.


I'm thinking the 62mm holder is next after these 750 piston mods are done.
Those 66's can wait.
l8r

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Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Soos

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Re: My piston project(s).
« Reply #41 on: February 03, 2010, 03:42:30 PM »
here is a nearly done photo of the pistons.


Top set is for a cb550, on the far right is a stocker 550 hooked up to the cut 750 piston with a wrist pin between the two.

Bottom set is Pinheads "surface turbulence" pistons.
Note the rings......




l8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Soos

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Re: My piston project(s).
« Reply #42 on: February 03, 2010, 03:45:26 PM »
62 and 66mm pistons here I come!



l8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline Pinhead

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Re: My piston project(s).
« Reply #43 on: February 03, 2010, 09:26:13 PM »
Boy, I am likin' that!!!

Edit: I don't remember completely, will I need a new set of rings or are the ones that were with the pistons usable?
« Last Edit: February 03, 2010, 09:28:20 PM by Pinhead »
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Doug

Click --> Cheap Regulator/Rectifier for any of Honda's 3-phase charging systems (all SOHC4's).

GM HEI Ignition Conversion

Quote from: TwoTired
By the way, I'm going for the tinfoil pants...so they can't read my private thoughts.
:D

Offline Soos

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Re: My piston project(s).
« Reply #44 on: February 04, 2010, 04:35:50 PM »
MUHWAHAHAHAHAHHAa.....

 :( :(
Yes you WILL need new rings.
Speaking of that, I need to finish cleaning the ring lands out.



l8r
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Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

traveler

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Re: My piston project(s).
« Reply #45 on: March 22, 2010, 08:46:54 AM »
Soos,

I need to get some pistons, and if you are boring cylinders, I have some work for you as well.

650 cylinders and 650 head for a 550 bottom.  Head is already enroute to MRieck.

(engine project underway...slowly)

~Joe
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Offline Soos

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Re: My piston project(s).
« Reply #46 on: March 23, 2010, 10:33:59 AM »
PM sent traveler.


L8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

traveler

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Re: My piston project(s).
« Reply #47 on: March 23, 2010, 12:40:22 PM »
Thanks much.

I returned a PM.

~Joe
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Offline Soos

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Re: My piston project(s).
« Reply #48 on: March 25, 2010, 03:41:06 PM »
Ok, gotta run but here is a sneak peak at some of my piston collection.

starting left to right:
top row
KZ650, KZ750 low dome, KZ750 high dome, 64mm??(CB350T??), 64.75(looks identical to the 64 in many ways, thinking it is a CB350T 3rd overbore piston set(s))

Middle row
std 550, cb750 auto piston W/ "Gentleman's Express" & 0.330 lift valve pockets, std 750 piston with same mods, std cb650 piston

Bottom row
cb650 piston modified to "Gentleman's Express" specs W/ clearance for 550 running a 650 cam, next as before but w/+2mm to the diameter where I started the 15 deg cut, third +4mm, fourth +6mm.

These are a set I have been waiting on someone willing to try them out, and recently found a racer looking for an overbore within the 5% of stock bore rule. These make it with room for a 60mm overbore later as well as having great potential for a high CR piston.


gotta run!


l8r
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-=≡ Soos ≡=-
Just think to yourself what would Alowishus Devander Abercrombie do?
"Brix will be shat by your neighbors." - schwebel
(61mm)652cc 1979 cb650

Offline moham

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Re: My piston project(s).
« Reply #49 on: March 25, 2010, 06:29:40 PM »
Quote from: Soos on March 25, 2010, 03:41:06 PM

Middle row
std 550, cb750 auto piston W/ "Gentleman's Express" & 0.330 lift valve pockets, std 750 piston with same mods, std cb650 piston

Bottom row
cb650 piston modified to "Gentleman's Express" specs W/ clearance for 550 running a 650 cam, next as before but w/+2mm to the diameter where I started the 15 deg cut, third +4mm, fourth +6mm.



Man, where was this stuff a year ago?? Good work, dude. I may have to start another 550 just to get in on some of those...

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