Author Topic: Cobra motor disassembly and rebuild (Read 108348 times)

Bill/BentON Racing · « **Reply #100 on:** December 19, 2015, 10:44:27 AM »

Santa, is ready!

One to go.No dimples to measure stretch!

.

Restoration Fan · « **Reply #101 on:** December 19, 2015, 05:51:09 PM »

Bill,
I knew we were friends but I didn't think you'd go to all this trouble just to build an engine for me. Thanks, man. I really appreciate it!

Ron

Bill/BentON Racing · « **Reply #102 on:** December 19, 2015, 06:02:31 PM »

$10,000.00 c'mon! 10 seconds guaranteed.....Frank can ride it! ! Well, lookee here!! Cleaning up nice.Bill

dragracer · « **Reply #103 on:** December 19, 2015, 07:00:20 PM »

Quote from: Bill/BentON Racing on December 19, 2015, 06:02:31 PM

$10,000.00 c'mon! 10 seconds guaranteed.....Frank can ride it! ! Well, lookee here!! Cleaning up nice.Bill

Quote from: Bill/BentON Racing on December 19, 2015, 06:02:31 PM

$10,000.00 c'mon! 10 seconds guaranteed.....Frank can ride it! ! Well, lookee here!! Cleaning up nice.Bill

Did you get the front wheel yet?? That rear wheel looks good. What about the I.D.of the bearings. Will the axle fit??

Bill/BentON Racing · « **Reply #104 on:** December 20, 2015, 02:34:13 PM »

Hmmmm, can you tell which journal I been cleaning and polishing to check! Hehe, magnaflux here we come as long as it's straight and round!! Stay tuned, Bill

Bill/BentON Racing · « **Reply #105 on:** December 20, 2015, 02:40:36 PM »

A before,and after, both 1&4 looked the same.

BPellerine · « **Reply #106 on:** December 20, 2015, 04:20:27 PM »

see some 2500 grit there,what are you polishing with bill?billp

Bill/BentON Racing · « **Reply #107 on:** December 20, 2015, 04:45:58 PM »

My finger!

, Bill #2 done!

Bill/BentON Racing · « **Reply #108 on:** December 20, 2015, 07:01:29 PM »

Rod journals clean and polished, time to measure etc and clean and polish mains, Bill

dragracer · « **Reply #109 on:** December 20, 2015, 08:06:06 PM »

Hey Bill, can you remove the sprocket and rotor and weigh the wheel for us. ?? Just want to reference that wheel to others.

BPellerine · « **Reply #110 on:** December 21, 2015, 12:17:14 PM »

Quote from: Bill/BentON Racing on December 20, 2015, 04:45:58 PM

My finger! , Bill #2 done!

nice,I meant,what grits or polish compound,and a finger!!hahabillp

Bill/BentON Racing · « **Reply #111 on:** December 21, 2015, 08:18:59 PM »

Yes, I'll check centerlines and weight. Did that with 2500,2000,1500,1200,1000,600,500,400. ....and just a little Mother's mag and aluminum polish.And lots of finger polishing, no gloves, need to feel what you doing. Still not 100% finished but close. Just got through checking pistons, they good,but old cylinder has at least .007+ clearance. Going back as a regular Cobra now while I get crank magnafluxed and source cylinder or sleeves. Here's two pins out of two different 73mm kits, L 39g. R 44g. Sent my rods and Stage IV heads north today!

,Bill

dragracer · « **Reply #112 on:** December 21, 2015, 08:37:02 PM »

Did you test fit the wheel in the bike yet. Wonder if it will align okay

Jerry Rxman Griffin aka MuthaF'er · « **Reply #113 on:** December 21, 2015, 08:40:33 PM »

Quote from: Bill/BentON Racing on December 21, 2015, 08:18:59 PM

Yes, I'll check centerlines and weight. Did that with 2500,2000,1500,1200,1000,600,500,400. ....and just a little Mother's mag and aluminum polish.And lots of finger polishing, no gloves, need to feel what you doing. Still not 100% finished but close. Just got through checking pistons, they good,but old cylinder has at least .007+ clearance. Going back as a regular Cobra now while I get crank magnafluxed and source cylinder or sleeves. Here's two pins out of two different 73mm kits, L 39g. R 44g. Sent my rods and Stage IV heads north today! ,Bill

Screw that, source some bigger pistons!

dragracer · « **Reply #114 on:** December 21, 2015, 09:06:52 PM »

Quote from: Jerry Rxman Griffin aka MuthaF'er on December 21, 2015, 08:40:33 PM

Quote from: Bill/BentON Racing on December 21, 2015, 08:18:59 PM
Yes, I'll check centerlines and weight. Did that with 2500,2000,1500,1200,1000,600,500,400. ....and just a little Mother's mag and aluminum polish.And lots of finger polishing, no gloves, need to feel what you doing. Still not 100% finished but close. Just got through checking pistons, they good,but old cylinder has at least .007+ clearance. Going back as a regular Cobra now while I get crank magnafluxed and source cylinder or sleeves. Here's two pins out of two different 73mm kits, L 39g. R 44g. Sent my rods and Stage IV heads north today! ,Bill

Screw that, source some bigger pistons!

Now who's egging him on?? Hahaha!!

Bill/BentON Racing · « **Reply #115 on:** December 21, 2015, 11:36:15 PM »

Uh, only bigger convenient ones....you have! So put up or shut up, lol! Send them on! Hehe, C'mon man! Bill

BPellerine · « **Reply #116 on:** December 22, 2015, 09:20:36 AM »

Quote from: Bill/BentON Racing on December 21, 2015, 08:18:59 PM

Yes, I'll check centerlines and weight. Did that with 2500,2000,1500,1200,1000,600,500,400. ....and just a little Mother's mag and aluminum polish.And lots of finger polishing, no gloves, need to feel what you doing. Still not 100% finished but close. Just got through checking pistons, they good,but old cylinder has at least .007+ clearance. Going back as a regular Cobra now while I get crank magnafluxed and source cylinder or sleeves. Here's two pins out of two different 73mm kits, L 39g. R 44g. Sent my rods and Stage IV heads north today! ,Bill

thanks Bill ,have a k2 crank I have to do,merry Christmas!!billp

Bill/BentON Racing · « **Reply #117 on:** December 22, 2015, 09:04:15 PM »

Bill, you too. Still got a long way to go!

,Bill

kmb69 · « **Reply #118 on:** December 22, 2015, 09:09:32 PM »

Is that just a matter of picture perspective or has that outboard hole for the 6mm been enlarged?

dragracer · « **Reply #119 on:** December 22, 2015, 09:15:07 PM »

Putting in some long hours on this one Bill. Better to take your time and get it right the first go round. It's the little things that make horsepower. Just don't do that to the ports or anywhere behind those valves. Lol.

Keep it moving bud.

Bill/BentON Racing · « **Reply #120 on:** December 22, 2015, 09:53:09 PM »

The other side....got to be careful, no scratching of valve or seats! Yeh, I'm done til I get back from MBSC Friday. Also going to wait on Mike and Stage IV head to come back , could run the Stage III, but makes more sense to wait. This Is the Cobra head, getting new springs and retainers , seals, etc. Only two helicoils to do....and all 6mm holes will be helicoiled! Keith , I'll check, pic does looks like it. The RC rods looked good, all small end bushings had no galling. The other RC crank all 4 were galled bad.enough to replace. Crank also looks great, but going to measure when I get back. RC H/D rods being balanced by Master Zin and new H/D ARP bolts and nuts installed! K.

New Cometic .050 copper headgasket being installed and replace the old cut out paper basegasket with .014 metal one. .020 max, maybe .010, we'll see. New main and rod bearings, cam chain and primaries! Might just work if I can keep the zip tie heads out of the combustion chambers! SMH, Bill

dragracer · « **Reply #121 on:** December 22, 2015, 10:10:55 PM »

Dang Bill, you could have delivered that package to me for George. I'm only 15 minutes off I-20. Would have saved both of us some headaches.

Bill/BentON Racing · « **Reply #122 on:** January 01, 2016, 12:51:51 PM »

Yo, y'all, Happy New Year, Cobra head coming right along.....oh yeh Calendar Girl runs great and sounds better! Fired it up @11:45 last night. Video uploading but YouTube stuck on no speed. Two chambers done, valves lapped etc. All good! K. This one going way into the 10's!

, Bill

BPellerine · « **Reply #123 on:** January 01, 2016, 01:22:39 PM »

those chambers blind you if you stare too long!!nice job.billp

Restoration Fan · « **Reply #124 on:** January 01, 2016, 03:48:08 PM »

Bill,
That one's going to be too pretty to put back in for racing. I think you should mount that bad boy in your house beside a light. Shine it out the front window and have your own SOHC bat signal!

Ron

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Author Topic: Cobra motor disassembly and rebuild (Read 108348 times)