738 replies to this topic

[Bruiser]

Fingers crossed

[claysummers]

I seem to be going around in circles here. Car starts instantly, though needs choke when cold. Done all the base settings and got it idling at 800rpm, linkages off. Opening throttle on rear carb and engine revs ok. Hooked up linkages and it bogs on any throttle. Release throttle and engine revs to 3500 and sits there. How it can be revving that high with the butterflies closed has me beat. Walked away. Need a drink!


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[Bruiser]

You haven’t forgotten the oil, have you?
How far down did you set the jets for starters?

They can be pretty touchy, a little bit of opening goes a fair way
Maybe one of the links is pulling it’s butterfly open a smidge, it doesn’t take much

You’re a pretty thorough bloke, you’ll beat ‘em
Having a drink always helps

[claysummers]

I’m using dextron atf. Filled them right up and puked a bit out. I’ll get some of the proper stuff now but could that be it? I set the jets flush with the bridges.

I’ll disconnect the linkages and see if I can get them to rev independently like the back one was. I’m a bit concerned that who ever did the butterflies hasn’t centred them correctly and they aren’t closing down properly, but surely not enough to rev to 3500. They looked ok but I didn’t give them much attention really. Looks like the manifold is coming off again as it is too tight to pull off the individual jugs.

Thanks for your input mate. I’ll be an expert by the time I finally get these things sorted.


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[Bruiser]

If it can idle at 800 with no links, the butterflies are probably ok, unless you are trying for lower than 800
and can’t get that
ATF might be the perfect stuff for you, it works for some folks, give it a chance you can experiment with it later.
You won’t know if you need thicker ( like more accelerator pump ) until you road test it under loads
In the books they say set the top of the jet down 12 flats worth from flush with the bridge, which is in the
50 - 60 thou-ish region. Flush will be pretty lean at idle there
Whip off the domes and use the butt end of your digital calipers to get them all the same.
You could remove the links one at a time to see if one of them ended up a bit out causing it
to open a crack and run high

[claysummers]

Yeah 800 I’m happy with but soon as I richen up jets she takes off. Will keep at it. Having the flu isn’t helping but I’ve got plenty of sick leave. Better have another read as I thought it said start flush.


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[Bruiser]

Idle screws might be wound up a fair bit so it will idle as lean as it is now
The plates don’t need to be cracked open much either, mine are less than half a turn from
the point where they touch the lever. Very sensitive to a tiny adjustment.
Different screws to yours, though.
Have you tried the lifting pin trick when idling at 800?
If you are really lean, the revs will drop and stay dropped. Only lift the pin a mill or so
or use a small screwdriver to lift up the piston instead

[Bruiser]

.  IMG_0707.jpeg   10.85K   5 downloads

Here’s the graph you are looking for, it’ll be in the book

[claysummers]

Yes thanks. I shut throttles right down. That’s why it amazes me engine revs out with no throttle. I swear they are closed yet still it revs up to 3500. Scary.


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[claysummers]

Ok yeh didn’t read step 3, turn down jet by two complete turns from flush. That’s 12 flats by my thinking?


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[Bruiser]

Yep, 12 flats
Just fact checked myself, it’s more like 40 thou.
Are the shoulders of the needles flush with the bottom surface of the piston?
That will change the needle position relative to your jet height

[claysummers]

Yes but will recheck. Thinking about it, the exhaust note and flutter ing indicates lean mix. They are quite unstable in that choking one off momentarily will bring the revs up permanently like the pistons are compensating for the lean setting and opening up.

Unfortunately I have to pace myself due to flu at the moment, but will have ago later. Advice appreciated mate.


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[Bruiser]

No worries get well
Loads of brandy and rum and scotch

Keep us posted

[claysummers]

This won't be any good then.At least the sun is out here now.

Reset jets and butterflies. Much better behaved, nice exhaust note, smell, and no flutter.

Linkages off, idle and fast idle backed right off. Now I've taken the silly trumpets off I reckon I can see gaps due to misscentring of the throttle plates. Backing idles right off still getting 1800 rpm.

Front piston is not coming up as much as the rear two and less suck apparent. Running on a bit on kill now which it wasn't before. Some progress. Will have to pull the tops off tomorrow and have another look at the butterflies and idle settings. On it goes.

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[Bruiser]

Good to hear you’ve had a bit of an improvement
These can test your patience, alright
Is it idling nice again at 800?
With the front piston bit, is that happening with the links back on?
If yes and yes, that front linkage needs a tweak
When does the 1800 thing happen?
You might be right, maybe the butterflies do need a check, the 1800 revs and the running on
when turned off suggest something funny is going on( If I’ve understood correctly)
You won’t be able to sleep till you’ve checked anyway
I reckon a heap of these get shelved and sold because the owner gave up on
the technical pain in the arse of getting them right, so the last guy could have
made any manner of cock-up

This thing is handy
I reckon I have good musician’s/dog’s ears, but my best with a bit of hose
didn’t come close when checked with one of these

 IMG_0708.png   22.52K   5 downloads

Good for testing at revs too to check how well the links are set
once they are off the idle stop screws
I’d lend you mine but you’re 80 miles away

[claysummers]

Joy at last!//

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[Bruiser]

Taken it for a spin yet?

[claysummers]

Hell yeah. Seems to have woken up the cam or something. Very noticeable increase in pick up off idle and continuing through cruising revs. X2 no comparison that's obvious.
Fussy boody things though, they eventually overcame their sooky and tuned easy enough. I think the rear butterfly was open too far somehow. Every thing with the back carb is painful to manipulate. But they go and sound next level. Wasn't really expecting such a gain, so pleasantly surprised. The amount of effort certainly worth it.

First out accelerator cable kept detaching due to the repro HZ cable I'm using. Substituted original retaining clip for the dodgy repro one, all good.

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[klevliend]

Hell yeah! I've been following your thread for a while so very satisfying to see the Triple SUs not only running but exceeding expectations   
And if I'm finding it satisfying you must be stoked, good on yah for sticking with it. 

[claysummers]

Cheers clevo. There is a tick, not sure if rocker or dissy yet. Never friggin ends, does it?


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[Bruiser]

Great stuff Clay

[claysummers]

Stoked. Thanks for your encouragement Bruiser.

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[claysummers]

Ok, sounds like you have a good set on the cards.
This linkage thing is difficult.

Do you plan to run vacuum advance and pcv?

Sorry Adam, I didn’t see your question earlier. I fitted vacuum advance yesterday, though don’t know if it’s making a difference to performance. I understand it is more about cruising economy.

Next Saturday doing a cruise out to Mannum via Old Princes Highway so will run some figures then. FB EK club will be meeting at Tottness Bunnings car park 10am if you want to come for a chat.

Not running PCV currently, but thinking about it. Any thoughts?


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[claysummers]

More shakedown runs today. Fitted factory choke cable to rear carb, as that's the only one it reaches. Started fine, not that it was particularly a cold morning. As with everything g on the rear carb, fitting the choke was a fair drama. It's right up against the firewall.

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[claysummers]

Cheers clevo. There is a tick, not sure if rocker or dissy yet. Never friggin ends, does it?


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Mid way on the much anticipated club run to Mannum today, the tick evolved into a collaped lifter. Bloody thing won't come up out of the bore. Must be some carbon build-up. After a couple hours trying eventually brought it home the 120km to Willunga on a trailer.

Any advice on removing crusted up lifters gratefully welcomed. I'm nearly ready to try the mig.

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