Duke's'72 Carbed KA project

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duke
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Re: Duke's'72 Carbed KA project

Postby duke » 11 Sep 2017 08:51

I finally had a chance to get my car on a set of proper corner scales yesterday. I'm very pleased with the result. All it took to get the cross weights to 50/50 was two turns on the front right coilover. Also pleased at the weight with me out of the car. It would be cool to loose 50 lbs and get the car under 1900 lbs, but drastic measures might be necessary for that, and I'm not quite sure I'm ready to get that crazy. Any weight loss measures will be concentrated at the front though, at an attempt to improve the F/R weight distribution.

All weights are with 1/4 tank of gas (~3 gallons, which is what I typically run when autocrossing).

Total weight without me.

ImageTotal_WO_Driver by Eldukerino, on Flickr

Total with me.

ImageTotal by Eldukerino, on Flickr

Rear.

ImagePercent_Rear by Eldukerino, on Flickr

Front.

ImagePercent_Front by Eldukerino, on Flickr

Right front/left rear cross weight.

ImageCross_RF_LR by Eldukerino, on Flickr

Left front/right rear cross weight.

ImageCross_LF_RR by Eldukerino, on Flickr

You may notice that there is a small amount of fluctuation in the weights, I just chalk this up to "noise" in the scales and ignore it.
Duke Schimmer

'72 2-Door 510
"Simplify and add lightness."

dat5102dr
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Re: Duke's'72 Carbed KA project

Postby dat5102dr » 11 Sep 2017 14:58

whats the level (bouldering)?

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duke
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Re: Duke's'72 Carbed KA project

Postby duke » 13 Sep 2017 10:14

dat5102dr wrote:whats the level (bouldering)?


That picture is of a problem called "The Drawing of the Three". It's up on Donner Pass in Tahoe and goes at around V11.
Duke Schimmer



'72 2-Door 510

"Simplify and add lightness."

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two_68_510s
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Re: Duke's'72 Carbed KA project

Postby two_68_510s » 13 Sep 2017 10:52

duke wrote:
dat5102dr wrote:whats the level (bouldering)?


That picture is of a problem called "The Drawing of the Three". It's up on Donner Pass in Tahoe and goes at around V11.


OK, I'm a dumb old cus, what the heck are you guys talking about? ;)
Joel

2 '68 510 2 door sedans
'95 240SX
74 Jensen Healey

“We will either find a way, or make one.” – Hannibal

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TheHeretic
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Re: Duke's'72 Carbed KA project

Postby TheHeretic » 15 Sep 2017 13:19

Where did you go to get the corner balancing?
Carpe Diem!
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Re: Duke's'72 Carbed KA project

Postby loungin112 » 15 Sep 2017 13:28

two_68_510s wrote:
duke wrote:
dat5102dr wrote:whats the level (bouldering)?


That picture is of a problem called "The Drawing of the Three". It's up on Donner Pass in Tahoe and goes at around V11.


OK, I'm a dumb old cus, what the heck are you guys talking about? ;)


Rock climbing pic from duke. Bouldering is climbing a route without a rope, usually only about 10-15 feet verticle.

I used to climb, wish i kept it up as it was fun and kept me in great shape.

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duke
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Re: Duke's'72 Carbed KA project

Postby duke » 17 Sep 2017 10:20

loungin112 wrote:
two_68_510s wrote:
duke wrote:That picture is of a problem called "The Drawing of the Three". It's up on Donner Pass in Tahoe and goes at around V11.


OK, I'm a dumb old cus, what the heck are you guys talking about? ;)


Rock climbing pic from duke. Bouldering is climbing a route without a rope, usually only about 10-15 feet verticle.

I used to climb, wish i kept it up as it was fun and kept me in great shape.


Yeah, what he said. Rock climbing is one of the greatest passions I have had in my life. I'm not sure what I would be doing with myself if I had never started climbing.

TheHeretic wrote:Where did you go to get the corner balancing?


I did it myself. Borrowed the set of scales from a friend and spent an afternoon messing around to get it all balanced. I know that there are a few shops at Sears Point that offer it as a service though.
Duke Schimmer



'72 2-Door 510

"Simplify and add lightness."

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DADZSUN
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Re: Duke's'72 Carbed KA project

Postby DADZSUN » 10 Oct 2017 12:35

duke wrote:After much deliberation and planning, I have finally decided to dive down the rabbit hole of installing rack and pinion steering on my car. Like many 510's out there, my steering box was badly worn, and definitely one of the main weak points of the chassis. I have seen many different iterations of rack and pinion installations in 510's, some better than others, and in this research I set a few ground rules for what I wanted.

1. Keep the rear steer setup-I didn't want to have to make new steering arms, a new front sway bar, etc.
2. Keep the oil pan rear sump- With how low my car is, I really like the security of having the crossmember there to guard the oil pan.
3. Use a new rack and pinion- As awesome as the MR-2 rack setups that I have seen are, I don't like the idea of using something that is 30+ years old and can be difficult to find. Also, I didn't like how slow the ratio's are for most stock steering racks.
4. Make it bolt in- I want to use the stock steering mounts on the frame rails to mount the rack, essentially making it a bolt-in affair.


I'm about to dive into R&P conversion myself. Hoping to put a more serious Solo2 package together for next year and the steering is definitely my car's weakest link right now.

Since you & I have similar setups (carbed, rear-sump KA), I'm hoping to do something similar to you. I plan to run an MK1 MR2 rack with Cressida inners, and 2 x '72 outer tie rods. I also plan to run a Quaife 2.5 quick-steer conversion to basically have the rack as-new.

Not sure how the rack will span the underside of the block/pan, seems awfully tight in there... How much room did you allow for engine movement?

Also, I noticed your mounting bracket seems to do without bushings on the rack?
'72 Datsun 510 - KA24E/R1 carbs/EDIS 4 Megajolt
'76 Datsun 280z

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duke
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Re: Duke's'72 Carbed KA project

Postby duke » 11 Oct 2017 08:52

DADZSUN wrote:I'm about to dive into R&P conversion myself. Hoping to put a more serious Solo2 package together for next year and the steering is definitely my car's weakest link right now.

Since you & I have similar setups (carbed, rear-sump KA), I'm hoping to do something similar to you. I plan to run an MK1 MR2 rack with Cressida inners, and 2 x '72 outer tie rods. I also plan to run a Quaife 2.5 quick-steer conversion to basically have the rack as-new.

Not sure how the rack will span the underside of the block/pan, seems awfully tight in there... How much room did you allow for engine movement?

Also, I noticed your mounting bracket seems to do without bushings on the rack?


I think I have about 3/8" between the top of the rack and the oil pan. My engine is very low in the chassis so there is really not a whole lot of room under there. I mounted the rack as high and far forward as practical, but in the end, it was a compromise between oil pan capacity and rack placement. I think the rack that I used is a little smaller in diameter than the MR2 rack, which gave me a little more room to work with as well.

Yes, the rack is solidly mounted. In fact, the only compliant bushing in all of my suspension is the polyurethane mounts for my front anti-roll bar. Because my car is primarily an autocross car, I wanted as responsive of steering as possible, hence the solid mounting.
Duke Schimmer



'72 2-Door 510

"Simplify and add lightness."


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