Author Topic: CB750A Street ET bracket drag bike. A year to build it. (Read 620602 times)

Sam Green Racing · « **Reply #4850 on:** December 30, 2019, 03:43:31 AM »

Keith, I would have thought that both clutches couldn't be engaged at the same time, is this not right ?

MRieck · « **Reply #4851 on:** December 30, 2019, 05:53:12 PM »

Quote from: Sam Green Racing on December 30, 2019, 03:43:31 AM

Keith, I would have thought that both clutches couldn't be engaged at the same time, is this not right ?

No oil pressure but there is bleed down time from full pressure which is up there for those engines.

scottly · « **Reply #4852 on:** December 30, 2019, 06:32:00 PM »

Quote from: Sam Green Racing on December 29, 2019, 03:37:55 AM

Here's what I found yesterday, IT'S HAPPENED TO SOMEONE ELSE.

Luckily for this guy, he was doing 45mph in low gear when his fuse blew and the bike started rolling to a stop with a dead motor.

So did his rear wheel lock up and skid?

kmb69 · « **Reply #4853 on:** December 30, 2019, 07:03:15 PM »

Quote from: Sam Green Racing on December 30, 2019, 03:43:31 AM

Keith, I would have thought that both clutches couldn't be engaged at the same time, is this not right ?

Both clutches cannot be engaged at the same time. The "shifting" valve can only address one clutch at a time or neither clutch.

Quote from: MRieck on December 30, 2019, 05:53:12 PM

No oil pressure but there is bleed down time from full pressure which is up there for those engines.

The oil pump only stops when the crankshaft stops.
The spec for the trans/torque converter/clutch pressure is 67-114 PSI at 1500 RPM.
The stall speed spec for the stock torque converter is 2500-2900 RPM. Somewhat higher on Samauto.
There will be some residual pressure to the torque converter and whichever clutch is "switched" on.
Not sure at what point, in the deceleration process, the TQ/clutch pressure and stall drops low enough to not turn a dead motor.

Sam Green Racing · « **Reply #4854 on:** December 31, 2019, 03:22:52 AM »

Quote from: scottly on December 30, 2019, 06:32:00 PM

Quote from: Sam Green Racing on December 29, 2019, 03:37:55 AM

Here's what I found yesterday, IT'S HAPPENED TO SOMEONE ELSE.

Luckily for this guy, he was doing 45mph in low gear when his fuse blew and the bike started rolling to a stop with a dead motor.

So did his rear wheel lock up and skid?

No Scott, if you read my full post, it says this.

Luckily for this guy, he was doing 45mph in low gear when his fuse blew and the bike started rolling to a stop with a dead motor.
Something he did find after stopping, the bike had gone into neutral.

If the bike had kicked into neutral, it couldn't go into a skid.

Sam.

MRieck · « **Reply #4855 on:** December 31, 2019, 04:43:44 PM »

Quote from: Sam Green Racing on December 29, 2019, 03:37:55 AM

OK guys, before I go any further, let's get one thing straight. The bike can't have been running when I came to a stop.
The fuse was blown and a bike can't start up again without sparks.

Here's what I found yesterday, IT'S HAPPENED TO SOMEONE ELSE.

Luckily for this guy, he was doing 45mph in low gear when his fuse blew and the bike started rolling to a stop with a dead motor.
Something he did find after stopping, the bike had gone into neutral.

For those that don't know, unlike a normal gearbox where neutral is between 1st and 2nd, on the Matic it's at the bottom with up one for 1st and up another one for 2nd. If I was in high gear (2nd) and I've found proof that I was, did it kick down to 1st causing the lock up as both gears are locked in place all the time and it's only the two clutches that determine which gear you are in.
With the motor not running, the oil pump would not be sending oil to the clutches and at some point through lack of pressure, the selector causes a down shift without telling the other clutch to release.

Over to you guys, Sam.

This "blown fuse" thing was happening quite a bit at Bradenton (years ago) when Wilbur and I looked into the harness. I gave up but Wilbur pressed on and found an intermittent ground which explained blowing fuses every 1/4 mile run. I think there were other problems related to electrical issues but I am not going to speculate. i personally took that engine apart and except for a very worn Hy-Vo primary chain and broken primary drive springs (extremely common) the engine was OK.

scottly · « **Reply #4856 on:** December 31, 2019, 06:56:45 PM »

Quote from: Sam Green Racing on December 31, 2019, 03:22:52 AM

Quote from: scottly on December 30, 2019, 06:32:00 PM
Quote from: Sam Green Racing on December 29, 2019, 03:37:55 AM

Here's what I found yesterday, IT'S HAPPENED TO SOMEONE ELSE.

Luckily for this guy, he was doing 45mph in low gear when his fuse blew and the bike started rolling to a stop with a dead motor.

So did his rear wheel lock up and skid?

No Scott, if you read my full post, it says this.

Luckily for this guy, he was doing 45mph in low gear when his fuse blew and the bike started rolling to a stop with a dead motor.
Something he did find after stopping, the bike had gone into neutral.

If the bike had kicked into neutral, it couldn't go into a skid.

Sam.

Sorry Sam, but you confused me when you said the same thing happened to him.

I think it's been established that a non-turning crankshaft/oil pump will not cause the rear wheel to lock up, regardless of the shift lever position?
Scott

dragracer · « **Reply #4857 on:** December 31, 2019, 07:17:35 PM »

[/quote] This "blown fuse" thing was happening quite a bit at Bradenton (years ago) when Wilbur and I looked into the harness. I gave up but Wilbur pressed on and found an intermittent ground which explained blowing fuses every 1/4 mile run. I think there were other problems related to electrical issues but I am not going to speculate. i personally took that engine apart and except for a very worn Hy-Vo primary chain and broken primary drive springs (extremely common) the engine was OK.
[/quote]

Mike, the blown fuse issue didn't just start at Bradenton. It was on going. I even pushed tat bike off the track in SC during early testing .

MRieck · « **Reply #4858 on:** January 01, 2020, 01:01:01 PM »

Quote from: dragracer on December 31, 2019, 07:17:35 PM

This "blown fuse" thing was happening quite a bit at Bradenton (years ago) when Wilbur and I looked into the harness. I gave up but Wilbur pressed on and found an intermittent ground which explained blowing fuses every 1/4 mile run. I think there were other problems related to electrical issues but I am not going to speculate. i personally took that engine apart and except for a very worn Hy-Vo primary chain and broken primary drive springs (extremely common) the engine was OK.
[/quote]

Mike, the blown fuse issue didn't just start at Bradenton. It was on going. I even pushed tat bike off the track in SC during early testing .
[/quote] I forgot about that Frank. Bill has that engine in his possession now though it is over 1000cc's and many internal parts replaced. Bill and I talked about what the bike itself needs and hopefully Bill can go through the wiring and getting the rear brake system it really needs.

johno · « **Reply #4859 on:** August 22, 2020, 12:16:26 AM »

Hi Sam,
After digging up that pic of you on the bike couple of days ago I was was flicking through your old thread, still find it really interesting even after 10 years

Im just curious Sam, what has happened to the bike ? do you still have it or did you sell it ?
cheers Johno

Sam Green Racing · « **Reply #4860 on:** August 22, 2020, 01:34:15 AM »

Quote from: johno on August 22, 2020, 12:16:26 AM

Hi Sam,
After digging up that pic of you on the bike couple of days ago I was was flicking through your old thread, still find it really interesting even after 10 years
Im just curious Sam, what has happened to the bike ? do you still have it or did you sell it ?
cheers Johno

Hi Johno, I left the bike with Mike Rieck and Bill Benton to see if they could salvage anything from it.
OK, it cost me quite a bit to build it but between them, Bill and Mike put a lot of time into it so I thought it only fitting to leave it with them to do as they pleased.

Sam.

MRieck · « **Reply #4861 on:** August 22, 2020, 05:30:05 AM »

The engine has been completely rebuilt and now has my billet block with 72mm high compression pistons. I did not see any overt problems with it that could have caused Sam's accident. It did need a new HyVo chain and dampening springs (the 4 square springs that are broken in every auto engine.)
The bike needs an appropriate rear brake system and some other things. Bill has all the parts now.

Sam Green Racing · « **Reply #4862 on:** August 22, 2020, 05:40:48 AM »

Awesome Mike, I hope you have as much fun as I did but with a more favorable ending. hahaha.

johno · « **Reply #4863 on:** August 22, 2020, 07:22:21 PM »

including Bill, You blokes are real gentlemen, thinking you should have a syndicate named the 3 Amigo's

scottly · « **Reply #4864 on:** August 22, 2020, 10:38:09 PM »

A couple of pics from Bill and Sam's visit to Gary Pena's place in AZ.

dusterdude · « **Reply #4865 on:** August 23, 2020, 04:04:51 AM »

You mean three old guys,lol.love ya sam

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Sam Green Racing · « **Reply #4866 on:** August 23, 2020, 08:43:20 AM »

Quote from: scottly on August 22, 2020, 10:38:09 PM

A couple of pics from Bill and Sam's visit to Gary Pena's place in AZ.

Awesome Mr Shipley. I was looking through my address book yesterday and came across your phone number, what memories.

Sam.

Sam Green Racing · « **Reply #4867 on:** August 23, 2020, 08:45:24 AM »

Quote from: dusterdude on August 23, 2020, 04:04:51 AM

You mean three old guys,lol.love ya sam

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Back at ya Mark.

dusterdude · « **Reply #4868 on:** August 23, 2020, 09:16:58 AM »

Damn,you still have that pic.

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Sam Green Racing · « **Reply #4869 on:** August 23, 2020, 10:08:14 AM »

Quote from: dusterdude on August 23, 2020, 09:16:58 AM

Damn,you still have that pic.

Sent from my LM-X420 using Tapatalk

Sure do Mark, my first taste of racing in the USA and all thanks to you my friend.
I can remember you saying, bring your leathers and you can race my bike.
I replied, OK, you supply the bike and I'll ride it and we can split the winnings. hahaha

Sam.

dusterdude · « **Reply #4870 on:** August 23, 2020, 10:12:09 AM »

Yep,I remember that.durn shame no winnings though.

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madmtnmotors · « **Reply #4871 on:** August 24, 2020, 03:50:59 AM »

Sam, I think I found your new calling. It's even "over there" in your neck of the woods!

https://www.guinnessworldrecords.com/news/2020/8/worlds-fastest-electric-ice-cream-van-created-to-combat-carbon-emissions-627032

Hope you are doing well!

Sam Green Racing · « **Reply #4872 on:** August 24, 2020, 06:52:52 AM »

Quote from: madmtnmotors on August 24, 2020, 03:50:59 AM

Sam, I think I found your new calling. It's even "over there" in your neck of the woods!

https://www.guinnessworldrecords.com/news/2020/8/worlds-fastest-electric-ice-cream-van-created-to-combat-carbon-emissions-627032

Hope you are doing well!

Wilbur, it was probably done with the club I used to race with, Straightliners.
I didn't manage to see this one and didn't hear about it but the club do do some crazy stunts in the name of publicity. hahaha.
As well as the mentioned fastest shopping trolly, there is also the worlds fastest toilet, shed and several other crazy classes.

Sam.

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Author Topic: CB750A Street ET bracket drag bike. A year to build it. (Read 620602 times)