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| Posted: Wed Mar 28th, 2012 02:43 am |
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1st Post |
Terry Bentley
Member
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This is an A400 that spit a rod out the side. Someone repaired it 50 years ago with a strip from tin can and then built up lead over the tin to replace missing chunk of aluminum case. New one to me, but whatever works...So its mill fodder, in case something doesnt work like I planned.
Cut the exhaust ports. I have always heard not to raise the ports on a Clinton, but who knows? Squared and widened the center port an additional 0.040" to narrow ribs down to 0.080". Then squared and eyebrowed the outer ports about an additional 0.060". The block is ready to have the ribs knife edged and aluminum cleaned up and opened. The ports are still plenty small enough not to worry about catching a ring. I should be able to go more on the eyebrow then taper down and blend.
I will go more extreme on the intakes to achieve closer port opening area of a 5 port conversion. Then pin the rings for insurance. The case has been bored out for ball bearing on pto. I machined the side cover to house a flanged bushing and needle bearing from a Mac motor to support mag side. I may just put an E65 crank in or use a forged aluminum rod with steel inserts for needles but replace them with a two, three or four piece full floating bushing to keep it legal for someone to run in the bushing class.
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| Posted: Wed Mar 28th, 2012 03:27 am |
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2nd Post |
Eddie Katcher
Member
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You have to be careful reducing the width of the exhaust webs. When they get thin, they can't dissipate heat fast enough, then they expand.........inward. El stick-o
Good port timing of the A-xx series engine is around 150 degrees on the exhaust and 120 degrees on the intakes. Do not bevel the input approach side of the intake ports toward the crankcase and start with the timing at 35 degrees BTDC. The intake gas charge needs to hit the deflector at 90 degrees for best scavenging. I'd put some high strength rod bolts in it as well.
You can use saw pistons as they have the rings pinned. A bit more compression as well. Even though they look heavy, they weigh within about one gram of the stock A-500 piston. You can use a stock caged needle from the mag side of a West Bend 580/700. Bore the mag plate to 1"-.001 put the bearing in the freezer and the cover on the stove at 250 degrees. Quickly press it in and you are good to go. Also to be really trick. machine two stuffer rings to go between each of the case bearings and the seals to keep the pumping efficiency has high as possible. You can also open up the intake by tossing the stock reeds in favor of two from a West Bend 820 cage. Open the intake passages to best take advantage of the longer wider West Bend pedals.
They don't call me the metal butcher for nothing.
puttnikdude
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| Posted: Wed Mar 28th, 2012 03:27 am |
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3rd Post |
| Posted: Wed Mar 28th, 2012 04:08 am |
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4th Post |
Terry Bentley
Member
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Its a billet chunk of aluminum. A ring was welded to top of case and drilled to bolt the pretty head on.
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| Posted: Sat Mar 31st, 2012 02:58 am |
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5th Post |
Terry Bentley
Member
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OK while the depleted cells in one part of my brain needed to get replenished, I focused on the Clinton again. This one had a leaky head, so had to clean the sealing surface up a little. will follow up when I work the bugs out of some things.
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| Posted: Sun Apr 1st, 2012 04:01 am |
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6th Post |
Steve Miller
Member
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terry ., this ol club runs pretty good ., a little tired but its got 180lbs compression .!! 
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| Posted: Sun Apr 1st, 2012 05:48 am |
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7th Post |
| Posted: Sun Apr 1st, 2012 05:51 am |
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8th Post |
Terry Bentley
Member
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Steve, on the side cover of your motor there.....Is that a rubber plug from a drum brake backing plate adjusting slot or is it just the lights messing with me?
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| Posted: Sun Apr 1st, 2012 10:14 am |
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9th Post |
Steve Miller
Member
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Yes sir ., terry thats exactly what it is .. it covered up the hole for throttle rod ,keeps a tiny bit of air from leaking out ,makes it look better to me ,and it was free ..!!! same as my intake ...it is - was an old snowmobile engine mount i sawed about 5 square pieces and started grinding i did not mill nothin all band saw and grinders i wanted to pretend i was in the 1960s . today im cuttin the top off a 490 piston and stuffing it in a p/p 58 jug i bored .035 over cuz it was junk .. i filled the ring lands with weld and cut a new one for a single thin ring from an 89 suzuki rm 125 motor .. you never no untill you try somethin ..
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Terry Bentley
Member
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Thats a lot of welding to make a PP piston. For all that trouble I would cut out of solid stock. At least the pin location is same. I cant find anything using a 53mm bore for ring donors on the stock PP sizes. That 89 Suzuki ring is same on all the 125 jap dirt motors, 54mm and what I am using for mac pistons that originally had 0.024 " thin rings. If you want titanium nitride rings they are available. If there were stock bore rings in something other than 0.063" thickness, I would already have new pistons available for the PP.
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Steve Miller
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thanks terry ., yes i agree it was a lot of work . but it was free .. im pretty tight when it come to havin to pay for somethin .. ill use most anything i can find layin around . befor id spend a buck ..  i was gonna use the whole rm piston but its dished and looked like to short of a skirt .. ?? if its possible to chat on phone wit you for a few minutes pm me your phone number i love to learn stuff .i only learn stuff by myself from messin around .. in my own mind i have lotta good ideas . some work just like i visioned some turn into nightmares ..
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Terry Bentley
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Steve Miller wrote: thanks terry ., yes i agree it was a lot of work . but it was free .. im pretty tight when it come to havin to pay for somethin .. ill use most anything i can find layin around . befor id spend a buck .. i was gonna use the whole rm piston but its dished and looked like to short of a skirt .. ?? if its possible to chat on phone wit you for a few minutes pm me your phone number i love to learn stuff .i only learn stuff by myself from messin around .. in my own mind i have lotta good ideas . some work just like i visioned some turn into nightmares ..
WOW!, Steve its like I am reading my own biography. Except the names were changed to protect the innocent...
Last edited on Mon Apr 2nd, 2012 05:28 am by Terry Bentley
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Terry Bentley
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I cant believe I have stayed focused on one thing for so long without getting too distracted. This has got to be a record for me. Cleaned up the intakes and close enough for the bench racing I do.
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Terry Bentley
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Anybody want to win an attaboy? I need to make some parts for this Clinton. I will give away an attaboy to the first person who guesses what this piece of stock is going to be whittled in to.
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Terry Bentley
Member
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Head???? Steve you been gluing stuff together with the door closed? I did make a scaled down model of a Saetta V-18 that stood only 3 inches tall. I could have gotten both case halves and head out of that piece of stock. But not exactly the size on a Clinton. Besides, I already have the head roughed out. I have to make a mandrel that will hold a cutter to cut the fins. So it will have to wait a while.
Last edited on Tue Apr 3rd, 2012 02:40 am by Terry Bentley
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