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Messages - Dunc the Funk

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1
Dan Dishon's Transmission Den / Driveshaft UJs
« on: May 19, 2023, 02:04:25 PM »
Hi, I'm looking at replacing UJs as I'm fitting a stronger yoke & one is a little worn. They're 1350 style.
The toughest looking ones seem to be the solid steel ones, sold by Jegs & Summit. They list parts by Dana Spicer, Inland Empire & Strange that all look the same. Cheaper from Dana Spicer though.
On Jegs these are:
Dana Spicer 094-5-1350X $24
Inland Empire 537-5-1350X $35
Strange 873-U1641 $38
Our current ones look like these: 890-961350 $56 (complete with red seal band) which have held up well. Maybe I should get them but the others 'look' better quality.

Anyone got opinions on these or recomendations on something better?

2
Roo Man's Room / Re: King pin / spindle bushings
« on: July 17, 2022, 03:28:19 AM »
Yes, the spindles have Anglia sized wheel bearings, but the kingpin is smaller diameter than the few bushings I've seen advertised.

I've heard people talking about the standard being 11/16". I may need to talk to my local machinist.

3
Roo Man's Room / King pin / spindle bushings
« on: July 16, 2022, 09:59:40 AM »
Hiya

I need to get the king pin bushings replaced on our drop tube axle. I've taken the worst one apart, the kingpin was held in with a grub screw & it all came out easy. The kingpin mics at 0.75" & does not appear to be worn. The bushings are 0.75” inside diam & 0.75” length with an extra 1/16” flange on the bottom one to take the vertical load. The bottom one is shaped like a hollow top hat, fitted upside down. The top bushing is a simple cylinder.

Can anyone tell me where I can get replacement bushings from or what car these may have been off originally?

4
Front Engine Dragsters / Blower restraint straps
« on: March 21, 2022, 11:05:04 AM »
Since our car is not running nitro and not a funny car it's pretty unlikely our blower restraints will ever be exposed to a serious fire.

But is there any technical advantage in fireproofing from silver restraints over black nomex ones?

5
Dan Dishon's Transmission Den / Re: Rearend gear ratio advice wanted
« on: January 10, 2022, 01:42:26 PM »
Thanks for responses. We don't have a data logger so I'm getting the rpm figure from onboard camera. I have reviewed the footage & it's actually only about 7500 rpm on a 178 mph run.

Using a slip calculator eg TCIs gives a figure of 11.8% (assuming no tire growth). Supercat's numbers indicate only 2.57%. At launch our motor always goes straight to 5000rpm so I guess our converter is looser? What is a normal range of slip?

6
Dan Dishon's Transmission Den / Re: Rearend gear ratio advice wanted
« on: January 06, 2022, 12:32:26 PM »
First season we ran a 4.29:1 & it was WAY too low, very violent launches. If the track was not good we had to leave in top. 3.7:1 does work well, our 60' is now down in the 1.05 sec range. I think either the converter is slipping a lot or the rev counter is telling lies.

7
Dan Dishon's Transmission Den / Rearend gear ratio advice wanted
« on: December 30, 2021, 09:56:32 AM »
We have run 7.5s in the quarter at around 180mph this season & we are wanting to go a bit quicker next season.
We have a powerglide, 3.7:1 gears & Hoosier 33x15x15 tyres. We are now crossing the finish at near 8000rpm, which is our current rev limit.
I'm thinking of going to 3.5:1 or even 3.4:1 rather than winding the motor higher.
What gears/rpm do you folks use and what diameter tyres?

8
Matt Shaff's Engine Shop / Re: Piston rings?
« on: December 30, 2021, 09:47:21 AM »
Last season I put Speed Pro HellFire rings in our 4.53" bore BBC, 10.5:1 static, Littlefield LB22 blower with hi-helix rotors, methanol injection.
Ran 7.50 @ 180 1/4 with plenty left (only 3% od on blower!).
Stripped it today, no issues at all, keeping same rings in for next season. Part no R1910735.

9
Altereds / Re: chassis mods - length vs suspension?
« on: December 01, 2021, 12:25:28 PM »
Interesting! We have had no traction problems at the very well prepped Santa Pod track this year so we had them up at 6 & even 6.5psi. We had our first bad bounce there when the driver started braking before the chute hit (not normal!).

When we went to the Melbourne (Yorkshire) 1/8 mile no prep track I would have dropped them to 5. However the driver seemed to think it would be more controllable keeping them at 6.

10
Altereds / Re: chassis mods - length vs suspension?
« on: November 13, 2021, 08:03:18 AM »
Thanks for opinons, I thought that might be the case. We really don't want to go back to rear suspension as the launch was unpredictable. We'll just have to be careful I guess.

11
Altereds / chassis mods - length vs suspension?
« on: November 11, 2021, 10:11:50 AM »
Since we removed the coilovers from the rear of our car & made it solid, it launches FAR better. However it is now prone to bouncing in the shutdown area or if the driver has to get off the throttle in a hurry without pulling the chute first.

The wheelbase is 113". I'm thinking there are two ways to go which might improve the situation:

1. Extend the wheelbase to 125" & replace the beam axle with the modern triangulated axle mount system.
2. Keep the wheelbase short but add front suspension (most work I guess).

Any opinions on what would be best?

12
Altereds / First drive in my altered!
« on: September 22, 2021, 05:04:29 AM »
On Friday I finally elbowed my driver out of my car & did a launch, a half pass then more-or-less a full pass. I'd tuned the car down a bit, blower 3% under instead of 3% over, 25 degrees of timing instead of 35, lot of rear wing. Even so I got a 1.15 60' & 5.45 to the 1/8th. 1/4 ET was 8.99, slowing to 122 as I groped for the parachute lever. What an awesome experience! I knew the acceleration would be brutal but didn't know it would feel so good!

I can't add any pictures as this seems to stop the topic from being created (tried 3 different browsers on 2 pcs).

Next day the driver is back in the seat for our races, I tuned it to 2 more pbs, 7.52 then 7.50. We were hoping to get into the 7.4s but the speed was not good, we think the valve springs are getting tired.

13
Spud Miller's Cave / Re: Reducing boost - reduce fuel?
« on: September 12, 2021, 06:32:38 AM »
Belated thanks for responses, I'm getting round to tweaking it today ready for next week. I've paid my RWYB entry so I'm committed now!

The '7.5' tune I have now calculates to total jet area = 0.0242in2 & the bypass is 0.0177in2 (150 pill). This is burning the plug ground strap plating but no more.

Looking at those figures I don't understand the .010 per 3%?

14
Altereds / Re: Front caliper seals?
« on: September 02, 2021, 02:43:18 PM »
Quick follow up in case anyone is interested. The Strange seals come as a set of 3 large & 1 or 2 small seals, they did not fit. I stripped the caliper & measured it up, found that British Standard size O rings of some description would fit so I ordered some up in EPDM & they are working really well. I guess American standard O rings are probably the same as ours.

15
Spud Miller's Cave / Reducing boost - reduce fuel?
« on: August 26, 2021, 11:40:42 AM »
Currently we run our blower just 3% over, 33 teeth on the crank & 32 on the blower. This gives us about 15psi of boost. I want to reduce the power for a newbie driver (me) and I have a 26 tooth pulley. If I put that on the crank & the 33 on the blower that's 20% underdriven. I will also put the timing to 30 or even 28 degrees & add more wing angle. Should I take a guess at taking some fuel out of it or leave the tune alone then lean it if I have to?

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