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Author Topic: Australian Belly Tank  (Read 1821966 times)

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Offline kiwi belly tank

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Re: Australian Belly Tank
« Reply #5475 on: November 12, 2017, 12:33:20 PM »
Using a solid pinion spacer & Loctite rather than a crush spacer should stop the nut backing off. With all this engine you have now I'm thinking you might want to come off the trailer with the 2.14's. How tall are your tyres? (spelling for Goggs) :-D
  Sid.

Offline Dr Goggles

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Re: Australian Belly Tank
« Reply #5476 on: November 12, 2017, 08:14:18 PM »
2.41:1 is 7000rpm@240mph.

2.14 is an ask for the 3/4 gear change with 28's on the back. Grumm has resisted my push for a 2.73 he wants to stay under 7500rpm.
Few understand what I'm trying to do but they vastly outnumber those who understand why...................

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Current Australian E/GL record holder at 215.041mph

THE LUCKIEST MAN IN SLOW BUSINESS.

Offline Stainless1

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Re: Australian Belly Tank
« Reply #5477 on: November 12, 2017, 08:59:05 PM »
2.41:1 is 7000rpm@240mph.

2.14 is an ask for the 3/4 gear change with 28's on the back. Grumm has resisted my push for a 2.73 he wants to stay under 7500rpm.

What RPM do you need to make max power? 
Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.

Offline kiwi belly tank

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Re: Australian Belly Tank
« Reply #5478 on: November 13, 2017, 12:17:04 PM »
28's, 7000, 1-1 trans & 2.41 =242mph. That's not enough gear for you or you'll have to rpm it. 7500 will get you to 259 & you still might run out of gear.
2.14 & 6500 gets you 253mph with spare rpm up your sleeve & I'll bet that engine has heaps of attitude down at 65k!
  Sid.

Offline maj

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Re: Australian Belly Tank
« Reply #5479 on: November 15, 2017, 02:03:26 AM »
And slip factor , 4-5%  ??

Offline grumm441

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Re: Australian Belly Tank
« Reply #5480 on: November 15, 2017, 03:19:28 AM »
Goggles just want'ss to get in it and rev it to 9500
With the close ratio box, I don't see it being as much of a problem with the 3 to 4 gear change
Unless he stuffs it up, or I forget to tighten the pinion.

In previuos years I've had more time to mess around with final drive ratio's on the lake
But they keep finding jobs for me. And my normal motorcycle tech offsider has had some issues and couldn't make it this year
Although he let me know he will be ready to go for next March
So if i get my act together, I will have two cars on the lake and all the motorcycle competitors to deal with.
This may make my final drive ratio swap window very small.

There is some good news being that the Reverend is back in the country.
He is however not on the mainland, which makes it a long swim to my place.
but he has assured us he will be on the lake and ready to go.
So not only will he get to put his E/FL record up where no one can get it for a few years
but he will be able to help with any final drive ratio changes that may be required
G
Chief Motorcycle Steward Dry Lakes Racers Australia Inc
Wazavudu Bellytank  Spirit of Sunshine Bellytank

Offline Dr Goggles

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Re: Australian Belly Tank
« Reply #5481 on: November 15, 2017, 04:44:35 AM »
And slip factor , 4-5%  ??

Thus far the car has been pretty much.hooked up,part of the legacy of good aero and not much power.

That might change so yeah 5% is probably fair.
Few understand what I'm trying to do but they vastly outnumber those who understand why...................

http://thespiritofsunshine.blogspot.com/

Current Australian E/GL record holder at 215.041mph

THE LUCKIEST MAN IN SLOW BUSINESS.

Offline wobblywalrus

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Re: Australian Belly Tank
« Reply #5482 on: November 15, 2017, 07:51:48 AM »
A rough track with a lot more power was my situation this year.  Usually there is minimal wheel slip and the gearing was set without considering it.  The wheel did slip, the engine hit the rev limiter, and this put a limit on the top speed.

The flip side of the coin is the tractive force is reduced with tall gearing.  if the reduction ratio is too small to start with and you do not get the anticipated wheel spin, you could'a gone faster.

Being prepared for a gear swap, like you are doing, is a good idea.  It is hard to get the ratio right until a run is made and there is a chance to get some data and do some figuring. 

Offline SPARKY

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Re: Australian Belly Tank
« Reply #5483 on: November 15, 2017, 03:04:07 PM »
 heay]r yea!   tractive force is reduced with tall gearing.   
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Offline Stan Back

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Re: Australian Belly Tank
« Reply #5484 on: November 15, 2017, 04:41:05 PM »
Well, for years, at Bonneville, I always figured tire growth covered clutch slippage and tire slippage (that's on a good course).  Nothing to look at for the last 4 miles, so I had the tach reading pretty much nailed down.  My old Isky Dream Wheel was always within a mile or two.  I hear there are computer programs that can do that with about the same accuracy.

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Offline Dr Goggles

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Re: Australian Belly Tank
« Reply #5485 on: November 15, 2017, 09:04:11 PM »
When you see the young folk staring at those smart phones they have Jim it's because they're using the gearing/tire size/revs app to work out how fast they can go....
Few understand what I'm trying to do but they vastly outnumber those who understand why...................

http://thespiritofsunshine.blogspot.com/

Current Australian E/GL record holder at 215.041mph

THE LUCKIEST MAN IN SLOW BUSINESS.

Offline Milwaukee Midget

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Re: Australian Belly Tank
« Reply #5486 on: November 20, 2017, 09:08:20 AM »
When you see the young folk staring at those smart phones they have Jim it's because they're using the gearing/tire size/revs app to work out how fast they can go....

Are you sure they're not playing "Pokémon Go", or maybe "Hearthstone: Heroes of Warcraft"?

I think they're playing Pokémon Go.

Pretty darned certain of it, actually . . .
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Well, I guess we're making a LOT of progress . . .  :roll:

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Offline WhiskersMagee

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Re: Australian Belly Tank
« Reply #5487 on: December 27, 2017, 11:31:08 AM »
Entertaining thread, when do you plan on running next?

Offline grumm441

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Re: Australian Belly Tank
« Reply #5488 on: December 27, 2017, 04:39:21 PM »
Entertaining thread, when do you plan on running next?

The plan is for March 2018
But as per usual, there are holdups
G
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Offline Dr Goggles

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Re: Australian Belly Tank
« Reply #5489 on: January 02, 2018, 01:54:47 PM »
Happy New Year campers.

Pow wow at the Colonel's yesterday.
My current job's activity line will cross the zero point on the y axis in about three months and so we are going to go hard and try and get this thing sorted before Speedweek 2018.

I'll drop the exhaust in today G.
Few understand what I'm trying to do but they vastly outnumber those who understand why...................

http://thespiritofsunshine.blogspot.com/

Current Australian E/GL record holder at 215.041mph

THE LUCKIEST MAN IN SLOW BUSINESS.