Harv's FED thread

[Brett027]

No 1 sons car is pretty speccy. Heard it coming several minutes before I saw him

[Harv]

Never been under 9,000rpm. The child is hard on the gear.

No idea where he learnt that from

Cheers,
Harv

[Blacky]

They look purty

[Harv]

The diff is now welded out for it's brackets and anti-rotation bars, so pretty much ready to get shortened and beefed up. I best get a little more decisive about the rear-end ratio. The Toyota G-series diff has lots of ratios to choose from, so it should be interesting.

There is some guidance in How to Hook and Launch. It uses the vehicle weight, engine stroke (as an indicator of torque potential) and first gear ratio. It then lets you calculate an optimum rear-end ratio. The chassis builder estimates it will come in around 1300lb. The grey has a 3.125" stroke, and the Slide and Glide will end up with a 1.80:1 first gearset. Plugging these numbers in gives a 5.78:1 rear end. Possible (and not out of the ordinary in a dragster), but a quick check shows that the grey would be pulling 8700rpm at the traps. Suspect 8700rpm out of the old girl would soon turn it into a grenade.

I know some Group Na humpies running Repco heads regularly zing to 8000rpm. Possible in the FED, given it would only be for a few seconds at a time. That would need a 4.93:1 rear end. 7000rpm needs a 4.32 ratio. The further down I go, the less torque to start moving those 26" slicks. I'm figuring asking the diff builder for somewhere between 4.5 and 4.9:1, then seeing what crown and pinion sets he can realistically find.

Opinions, as always, welcome.

Cheers,
Harv

[BS]

Hey Harv,

Are you able to send your hook and launch calcs?

I’m running 4.11s beacuase that is what is in the diff from the wreckers and I didn’t have the budget to change but with the 4 speed Toyota box it’s a 3.278:1 first gear.

When discussing rear end ratios with they guys who have been doing it for years their advice to me was to work back from the finish line.


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[Harv]

PM me your mobile number and I'll send some photos of the calculation.

Cheers,
Harv

[Dr Terry]

When discussing rear end ratios with they guys who have been doing it for years their advice to me was to work back from the finish line.

Exactly right. We drag raced at Castlereagh in the early 80s & we used to calculate the rear end ratio & tyre size by aiming to go over the finish line at 1,000 rpm under our redline in top gear.

Dr Terry

[Harv]

Lined up some front wheels for the FED. These were originally owned by Brendon Murry in the US. Brendon is one serious competitor in top fuel (AA/FD) FED racing... 6 times world champion. The wheels then spent some time locally on a Mopar-powered FED running 155mph.

There are a bunch of IHRA requirements for wheels that I have to meet - approved racing tires only, no retreads, minimum 12” diameter, 0.1”inch minimum diameter steel spokes, all spoke holes laced, maximum of 1” offset front axle.

First-class pram wheels for a grey-powered FED .

front wheels.jpg (90.02 KiB) Viewed 834 times

Cheers,
Harv

[BS]

Lots of people don’t get the whole nostalgia drag thing. I’m constantly getting comments about “why would you bother building something like that” but to me the history of the parts, collecting them and the stories that come from that is what makes it fun and interesting.

Sure you could go buy a ls powered commodore, throw some giggle gas at it and run way quicker for a lot cheaper but I personally don’t see the fun in that.

I guess what I’m saying in a long round about way is cool wheels and nice history/story on them


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[Blacky]

Lots of people don’t get the whole nostalgia drag thing. I’m constantly getting comments about “why would you bother building something like that” but to me the history of the parts, collecting them and the stories that come from that is what makes it fun and interesting.

Sure you could go buy a ls powered commodore, throw some giggle gas at it and run way quicker for a lot cheaper but I personally don’t see the fun in that.

I guess what I’m saying in a long round about way is cool wheels and nice history/story on them


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Yup , preaching to the converted - if we weren't we wouldn't be on this forum in the first place

[Harv]

Some more goodies on order for the FED.

Front spindles are from Strange (S3453). These are different to a normal FB/EK in that they do not use a hub to mount the wheel... the fancy bicycle wheels just slide straight onto the spindle, like a billycart. These ones have dimensions similar to old &*#@ Anglias, and are referred to as Anglia spindles. Pretty common in dragsters and altereds, and assume they were used back in the day as they were a small, light spindle. There are alternative spindle mounts (e.g. some referred to as "Strange spindles" that are based on Camaro dimensions). I guess I could have hunted around for a set of original Anglia spindles to make this thing more authentic, but finding and then reco'ing a pair would not have been an easy task. The kids would give me that dissapointed look if I bought &*#@ parts home.

Strange S3453 spindles.jpg (41.85 KiB) Viewed 799 times

For the steering box, I'm using a Strange S3441S unit. These were designed off a Standard 10. Again, could have tried finding a Standard steering box, but they are like rockinghorse poo (try finding someone who even knows what a Standard was).

Strange S3441S steering box.jpg (20.64 KiB) Viewed 799 times

For the steering wheel, I am using a ProWerks C42-482-D. The handgrips on these are beautifully shaped, almost art-deco. It will use a Strange quick disconnect to allow the wheel to be removed (which will help get my broad backside into and out of this thing).

Prowerks butteryfly steering wheel.jpg (9.44 KiB) Viewed 799 times

Cheers,
Harv

[Errol62]

Cool Harv. What’s the steering wheel diameter please? Looks smallish.


FB ute fixer upper, EK van on rotisserie

[Harv]

Prowerks wheel dimensions.JPG (31.03 KiB) Viewed 793 times

Cheers,
Harv

[Errol62]

Thanks Harv

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[Harv]

Rear brakes: VN-VS live axle disks, reco’d calipers. Can probably find something lighter (read pricier), but this will do for now. The red calipers should be good for 10mph

152C3B36-6B1E-4623-A901-2B385D14973E.jpeg (3.44 MiB) Viewed 750 times

Seat has been made, front axle done and front wheels in place. Fireproof suit, boots, undies and balaclava arrived, kids had a field day playing dress-up.

Cheers,
Harv