Author Topic: Cobra motor disassembly and rebuild (Read 107657 times)

Bill/BentON Racing · « **Reply #175 on:** January 12, 2016, 08:23:14 AM »

Yep, Frank, trying to do it right the first time , K, Bill

scottly · « **Reply #176 on:** January 12, 2016, 06:56:59 PM »

Quote from: Bill/BentON Racing on January 11, 2016, 08:51:55 PM

22lbs stock. A fine balance no doubt!

Thanks, I was thinking the stock crank was heavier than 22lbs. It is indeed a fine balance between too much flywheel inertia and too little.

bwaller · « **Reply #177 on:** January 12, 2016, 08:35:19 PM »

Early on I decided with some prompting from that Rieck guy that roadracing a middleweight it was wise to maintain some enertia by not removing rotating mass and helping drive off the corners. In drag racing why not lighten that mass since there is no further throttle modulation once off the line?

754 · « **Reply #178 on:** January 12, 2016, 09:28:52 PM »

I think it depends a lot on how happy you are with the way it leaves the line..
Of course in bracket racing it should not matter..

Jerry Rxman Griffin aka MuthaF'er · « **Reply #179 on:** January 12, 2016, 10:27:52 PM »

Hole shot.

scottly · « **Reply #180 on:** January 13, 2016, 07:49:37 PM »

Quote from: bwaller on January 12, 2016, 08:35:19 PM

Early on I decided with some prompting from that Rieck guy that roadracing a middleweight it was wise to maintain some enertia by not removing rotating mass and helping drive off the corners.

In a roadracing situation, the goal is to provide an even power delivery to the rear wheel, rather than dump stored energy during the launch from a standing start. The best example of too little flywheel inertia I have first hand experience with was my '82 CR 480; it was impossible to ride it up a slight incline covered with packed snow and ice. Every time the cylinder fired, the rear wheel spun, throwing the ass end out to one side or the other, and I went down. My buddy on his '82 XR 500, which had 2-4 times the flywheel mass, had no problems on the slick surface. I later learned that a combination of slipping the clutch while applying throttle and riding the rear brake helped overcome the lack of flywheel in tricky situations, but it was touch and go at best. Honda added more flywheel weight every year after the original 480, to somewhat mellow the power delivery.

POPS 911 · « **Reply #181 on:** January 14, 2016, 06:03:35 AM »

BILL: Take that rod out of those flat slides, seems more than a few folks gave you that tip = your head builder, FRANK IN THE 10'S, and ME. Good thing about running 29's with the built in throttle stop your S/E numbers can stay good until you want to set a new record [ on a minus - DA ] on any day at the track, or pick you up or down with your dial in from changing DA's in ST/ET from early morning passes to late rounds in the nights. That's why you buy a weather station.........

Bill/BentON Racing · « **Reply #182 on:** January 14, 2016, 06:39:31 PM »

POP'S, thanks. Here you go, we going lighter,lower, leaner, meaner, and longer! K.

, Bill

bwaller · « **Reply #183 on:** January 14, 2016, 09:43:11 PM »

In a roadracing situation, the goal is to provide an even power delivery to the rear wheel, rather than dump stored energy during the launch from a standing start. The best example of too little flywheel inertia I have first hand experience with was my '82 CR 480; it was impossible to ride it up a slight incline covered with packed snow and ice. Every time the cylinder fired, the rear wheel spun, throwing the ass end out to one side or the other, and I went down. My buddy on his '82 XR 500, which had 2-4 times the flywheel mass, had no problems on the slick surface. I later learned that a combination of slipping the clutch while applying throttle and riding the rear brake helped overcome the lack of flywheel in tricky situations, but it was touch and go at best. Honda added more flywheel weight every year after the original 480, to somewhat mellow the power delivery.

Scottly, you need to try racing a TZ!

Medyo Bastos · « **Reply #184 on:** January 15, 2016, 06:39:46 AM »

Quote from: Bill/BentON Racing on January 14, 2016, 06:39:31 PM

...Here you go, we going lighter,lower, leaner, meaner, and longer! K. , Bill

great, get to ready for me to pick up!

...Save a tree, eat a beaver...

Bill/BentON Racing · « **Reply #185 on:** January 15, 2016, 10:11:17 AM »

Check it out! K. Time warp!

kmb69 · « **Reply #186 on:** January 16, 2016, 08:26:32 AM »

What happened to the all time, record setting attempt with a Hondamatic thread?

I thought that was gonna be real good and was all ears subscribed.

TurboD · « **Reply #187 on:** January 16, 2016, 08:30:51 AM »

^ What he said..

dragracer · « **Reply #188 on:** January 16, 2016, 10:36:35 AM »

Quote from: kmb69 on January 16, 2016, 08:26:32 AM

What happened to the all time, record setting attempt with a Hondamatic thread?
I thought that was gonna be real good and was all ears subscribed.

I just noticed it was missing myself. I'm sure Bill's project is still alive even if the thread was killed off. What exactly is the Hondamatic record and where can we find the stats???

Jerry Rxman Griffin aka MuthaF'er · « **Reply #189 on:** January 16, 2016, 11:10:38 AM »

+4!! I booked my flight already. Gotta have the special entertainment.

Bill/BentON Racing · « **Reply #190 on:** January 16, 2016, 02:04:18 PM »

What thread?

It'll be back.....we got to work some things out, then I'll revive it. Project is not dead!! Jay at APE got my Cobra crank yesterday or day before. It will probably be the next runner. Stay tuned, Bill

POPS 911 · « **Reply #191 on:** January 17, 2016, 09:49:50 AM »

HONDAMATIC FANS : I guess this will be the time I finally get one of my 7- CB750A HONDAMATIC on the track !!! Will finish off one and spend 2016 at my home track getting it dial in like the CM400A cc "TURTLE". I will not chase the dreamers road of the fastest but that of the winnings ticket collector for the most CONSISTANCE SOHC 750A. Will buy a 500cc water cooled V-twin HONDA for cheap and run in that V-TWIN class against those Harleys and that one Suzuki I saw at my last Valdosta event [ the 1982 Yamaha 920R chain driven big tank V-TWIN that I bought new in 83 would be my choice for that class.] Come on BILL you are the HONDA MASTER SHOP GUY so you could win on a w/c V-TWIN 500cc HONDA in that class, less bikes than any class except Top Fuel.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #192 on:** January 17, 2016, 10:33:17 AM »

There you go Pops

Quit distracting Bill

He already has his hands more than full......

Looking forward to seeing your bike(s) in the pits eventually. You REALLY need to start off at Valdosta to get it dialed in for your track championship.

Bring Weeks with you too.

POPS 911 · « **Reply #193 on:** January 17, 2016, 10:55:02 AM »

That would be a 1989 HONDA HAWK GT 650 water cooled V-TWIN TO RACE IN THE V-TWIN CLASS. Not a 500cc HONDA.

Bill/BentON Racing · « **Reply #194 on:** January 17, 2016, 04:57:20 PM »

POP'S, that could work. RC51 might put a few on the trailer also! 2016 sure going to be interesting for sure.

NalleyRacing · « **Reply #195 on:** January 17, 2016, 08:15:09 PM »

Cant forget about purple rain!!

Bill/BentON Racing · « **Reply #196 on:** January 18, 2016, 05:01:41 AM »

Just needs a momo!

Jim F · « **Reply #197 on:** January 18, 2016, 11:42:49 AM »

and I have an RC51 and a TL1000R...........................hummmmmm

Bill/BentON Racing · « **Reply #198 on:** January 18, 2016, 12:11:28 PM »

C'mon Jim!

dragracer · « **Reply #199 on:** January 18, 2016, 02:49:57 PM »

Bill, did you get the engine started yet? I think you mentioned you would be cranking it the other day. How about a report with video. Inquiring minds want to know. I'm in need of some motivation right now and seeing your progress might give me a kickstart.

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Author Topic: Cobra motor disassembly and rebuild (Read 107657 times)