Author Topic: Cobra motor disassembly and rebuild (Read 107671 times)

Bill/BentON Racing · « **Reply #150 on:** January 09, 2016, 03:49:53 PM »

Same caliper sold for $297.50! Getting there. All helicoils done! Yeah Time for its bath!!

Bill/BentON Racing · « **Reply #151 on:** January 09, 2016, 04:15:09 PM »

Got to wash all this away!

Bill/BentON Racing · « **Reply #152 on:** January 09, 2016, 05:52:05 PM »

Getting there.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #153 on:** January 09, 2016, 06:30:20 PM »

gschuld · « **Reply #154 on:** January 09, 2016, 08:20:20 PM »

Purdy

Bill/BentON Racing · « **Reply #155 on:** January 09, 2016, 09:21:36 PM »

Finished, well 98%!

Bill/BentON Racing · « **Reply #156 on:** January 09, 2016, 09:26:35 PM »

Too save this head....29 of 30 6mm bolt holes had to be helicoiled! One valve cover bolt was fine, so I left it cause I could !!! 29 f'in ones! But I wanted to be like Mike Rieck. ..so I did it, anything to save 40 year old RC parts!

, Bill

NalleyRacing · « **Reply #157 on:** January 09, 2016, 09:57:35 PM »

I smell a 10 second pass a'cookin

Big Jay · « **Reply #158 on:** January 09, 2016, 11:08:18 PM »

Bill, send me the crank and I will balance it.

Bill/BentON Racing · « **Reply #159 on:** January 10, 2016, 04:59:09 AM »

Deal brother. I'll box it up and shoot it out tomorrow, thanks Jay, I need all the help I can get. K.

, Bill

Bill/BentON Racing · « **Reply #160 on:** January 10, 2016, 01:19:24 PM »

Anyone wondering crank weighs 19 lbs.

Sam Green Racing · « **Reply #161 on:** January 10, 2016, 04:07:44 PM »

I'd give my right arm to be helping you Billy

Retro Rocket · « **Reply #162 on:** January 10, 2016, 04:11:41 PM »

Quote from: Sam Green Racing on January 10, 2016, 04:07:44 PM

I'd give my right arm to be helping you Billy

I think I can arrange shipping for that Sam....

Nice work Bill...

Sam Green Racing · « **Reply #163 on:** January 10, 2016, 04:14:53 PM »

I'll bet you can, hahaha

Retro Rocket · « **Reply #164 on:** January 10, 2016, 04:19:43 PM »

Sam Green Racing · « **Reply #165 on:** January 10, 2016, 05:13:27 PM »

Bill/BentON Racing · « **Reply #166 on:** January 10, 2016, 05:24:58 PM »

Man , so much in the works for 2016!

Jerry Rxman Griffin aka MuthaF'er · « **Reply #167 on:** January 10, 2016, 06:46:23 PM »

Quote from: Sam Green Racing on January 10, 2016, 04:14:53 PM

I'll bet you can, hahaha

Yeah but it has to be attached to the rest of you Sam. Gotta get you back somehow.

754 · « **Reply #168 on:** January 10, 2016, 06:49:23 PM »

Let me know if you need a steering stem for the Ceriani, have to make one for mine and maybe some Betor trees as well ..weigh that Pm caliper, i think they were like 14 oz. We ran 4 of them on a chopper, the guy said it stopped better than expected..

Bill/BentON Racing · « **Reply #169 on:** January 11, 2016, 04:51:46 AM »

Frank, will do. It's very light for sure, thanks, Bill

scottly · « **Reply #170 on:** January 11, 2016, 06:17:36 PM »

Quote from: Bill/BentON Racing on January 10, 2016, 01:19:24 PM

Anyone wondering crank weighs 19 lbs.

How does that compare to a stock crank, Bill? Remember, energy is stored in the rotating mass of the crank, and this stored energy is what launches you off the line when you let out the clutch at 6000 RPM. Weight in the right place can sometimes be your friend.

TurboD · « **Reply #171 on:** January 11, 2016, 06:27:24 PM »

I agree Scottly, depending on a racers clutch hand a lightened crank may not be your friend.

dragracer · « **Reply #172 on:** January 11, 2016, 06:52:46 PM »

Quote from: TurboD on January 11, 2016, 06:27:24 PM

I agree Scottly, depending on a racers clutch hand a lightened crank may not be your friend.

Not a fan of lightened cranks in dragracing. Need that rotating weight off the line as TurboD mentioned. Light weight rods and pistons are okay, light bikes okay, light riders even better- light cranks no bueno.

Bill/BentON Racing · « **Reply #173 on:** January 11, 2016, 08:51:55 PM »

22lbs stock. That's why I run my lightened rotor some. Helps launch. Stroker cranks I just want balanced on a 750, they ate weak already once stroked. 900F I'll probably lighten some. Well, why don't you add a few pounds then and balance. Cause it going slow it down maybe? A fine balance no doubt!
Grandma will launch it!

, Bill

dragracer · « **Reply #174 on:** January 12, 2016, 06:23:30 AM »

Wise move to balance it Bill. No way would I ever consider running a engine with thrown together parts without balancing the rotating assembly. I learned that years ago from a big block Chevy engine I had in a 1970 Nova SS, 396 with a 4 speed. Spend the money now, or you will be spending it later.

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Author Topic: Cobra motor disassembly and rebuild (Read 107671 times)