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Post by Zed on Feb 27, 2018 10:53:46 GMT
Mine does nothing.
Suck on pipe and it seems to work as it should. I've checked with strobe and get 8-10 degrees extra like this.
Vacuum port on drla carb is clear, very easy to blow through in fact.
The hose isn't split.
By plugging/unplugging the hose at various revs/mech advance I find zero vac advance at any point.
Can only be that there is no vacuum at the port on the carb?
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Post by popegregoryxi on Feb 27, 2018 11:34:48 GMT
Yes.
Has the other carb got a take off? If not, I guess you're going to take the carb off and investigate..
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Post by Zed on Feb 27, 2018 12:14:56 GMT
Yes. Has the other carb got a take off? If not, I guess you're going to take the carb off and investigate.. I've just been for a more focussed look. It does pull a bit of vacuum, very pulsey, I fitted a welding tip in the line which smoothed it out a bit but still no distributor advance. Though it seems ok I've now got the distributor in pieces anyway, as you do! Just scoffing a pork pie. The ball bearing might have worn a pit into the plate, it does seem a little bit sticky. Carb off next to see if it's been buggered about with. I got them from LHU Steve who says he got them from someone who'd been using them with a turbo so it's worth a look though I can't see why anyone would hack at the vacuum port. |
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Post by popegregoryxi on Feb 27, 2018 14:01:11 GMT
Hmm.. I no nothing about modding carbs for Turbo's, but I'm sure iv read something about them having to be drilled somewhere.. that said, it's been running fine without a turbo so that's probably not it. I know some people swear by an anti pulse valve on drla's, but never needed to. Strokes chin...
Only other thing I can think of is an air leak reducing the vacuum, but would have thought that would have been noticeable.
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Post by popegregoryxi on Feb 27, 2018 14:12:13 GMT
More importantly, I'm surprised you are eating a pork pie.. didn't you have a mate that added a special ingredient to said delicacies... 🤔
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Post by Zed on Feb 27, 2018 15:18:01 GMT
More importantly, I'm surprised you are eating a pork pie.. didn't you have a mate that added a special ingredient to said delicacies... 🤔 I forgot about that.  I've fixed it. I did two things. The ball bearing had pressed itself into the plate making a small crater which I quite easily filed flat - I've seen far worse. I needed to saw a few mm off the bottom of the rotor arm due to the magnetic collar, it had been pressing on the cap around the carbon, not bad enough to notice for 10,000 miles though, I suppose it can only have pressed the shaft down against the spring on the distributor drive, though the cap clipped on more easily. Oops. Can't be this though, the vac mechanism moves the pick up. It might have effected the mech advance though? Whatever, I've now got 40degs total advance. Not driven yet. |
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Post by popegregoryxi on Feb 27, 2018 16:24:27 GMT
Nice one. You will have even more torques now! Probably not enough to keep up with a Scooby though.. 😛
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Post by Zed on Feb 27, 2018 16:44:08 GMT
Nice one. You will have even more torques now! Probably not enough to keep up with a Scooby though.. 😛 But you would have rev like a boy racer to beat me. 😱 |
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Post by paradox1001 on Feb 28, 2018 16:14:46 GMT
Yes. Has the other carb got a take off? If not, I guess you're going to take the carb off and investigate.. I've just been for a more focussed look. It does pull a bit of vacuum, very pulsey, I fitted a welding tip in the line which smoothed it out a bit but still no distributor advance. Though it seems ok I've now got the distributor in pieces anyway, as you do! Just scoffing a pork pie. The ball bearing might have worn a pit into the plate, it does seem a little bit sticky. Carb off next to see if it's been buggered about with. I got them from LHU Steve who says he got them from someone who'd been using them with a turbo so it's worth a look though I can't see why anyone would hack at the vacuum port. I think advance gets limited or locked out at the dizzy with turbo conversions. |
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Post by Zed on Feb 28, 2018 16:48:32 GMT
I've just been for a more focussed look. It does pull a bit of vacuum, very pulsey, I fitted a welding tip in the line which smoothed it out a bit but still no distributor advance. Though it seems ok I've now got the distributor in pieces anyway, as you do! Just scoffing a pork pie. The ball bearing might have worn a pit into the plate, it does seem a little bit sticky. Carb off next to see if it's been buggered about with. I got them from LHU Steve who says he got them from someone who'd been using them with a turbo so it's worth a look though I can't see why anyone would hack at the vacuum port. I think advance gets limited or locked out at the dizzy with turbo conversions. Indeed, it didn't make sense to me, but the info was gratefully received for pondering. Here's the dent, it looks really bad but can't have been as it was easily filed away.  |
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Post by paradox1001 on Feb 28, 2018 16:53:12 GMT
I think advance gets limited or locked out at the dizzy with turbo conversions. Indeed, it didn't make sense to me, but the info was gratefully received for pondering. Here's the dent, it looks really bad but can't have been as it was easily filed away. Does look bad in the pic |
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