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Author Topic: Australian Belly Tank  (Read 1273600 times)
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SPARKY
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« Reply #5475 on: November 12, 2017, 11:58:51 AM »

We now put a spot weld our pinion nuts.

I have made my 7.5 rear axle so that I can pull it out the back of the car. I change complete axle housings, to change gear ratios using the same axles backing plates and brake drums--using a quick disconnect fitting in the brake line makes the brake bleeding much faster with a lot less fluid lost.

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Miss LIBERTY,  changing TKI  to noise, dust and RUST!!!

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kiwi belly tank
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« Reply #5476 on: November 12, 2017, 01:33:20 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) grin
  Sid.
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Dr Goggles
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« Reply #5477 on: November 12, 2017, 09:14:18 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.
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Few understand what I'm trying to do but they vastly outnumber those who understand why...................

http://thespiritofsunshine.blogspot.com/

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Stainless1
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« Reply #5478 on: November 12, 2017, 09:59:05 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? 
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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.
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« Reply #5479 on: November 13, 2017, 01:17:04 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.
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maj
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« Reply #5480 on: November 15, 2017, 03:03:26 AM »

And slip factor , 4-5%  ??
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grumm441
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« Reply #5481 on: November 15, 2017, 04:19:28 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
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« Reply #5482 on: November 15, 2017, 05:44:35 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.
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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.
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« Reply #5483 on: November 15, 2017, 08:51:48 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. 
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SPARKY
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« Reply #5484 on: November 15, 2017, 04:04:07 PM »

 heay]r yea!   tractive force is reduced with tall gearing.   
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Miss LIBERTY,  changing TKI  to noise, dust and RUST!!!

The # 1 issue is: TO KEEP THE REPUBLIC      
   Center for Self Governance            tncsg.org     mrspowell.org

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure or nothing."   Helen Keller
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« Reply #5485 on: November 15, 2017, 05:41:05 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.

Stan
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« Reply #5486 on: November 15, 2017, 10:04:11 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....
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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.
Milwaukee Midget
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« Reply #5487 on: November 20, 2017, 10:08:20 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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