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lpgo
Firing on 1-2 Spark
Joined: November 8th, 2009, 5:42 pm
Posts: 2847
Location: NL
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 Re: Visa TDC ken wrote: Since a Visa 652 starter ring has 131 teeth, the engine needs to be turned anticlockwise (131 x 10)/360 teeth from TDC to be set at 10* BTDC. ( That's 3.64 teeth.  ) If you've still got the Visa gearbox or bellhousing to hand and offer up the engine to it, the flywheel stud should then be directly under the low speed sensor hole. I don't know how this points cam is fixed to the Visa camshaft, but if it's the usual expanding bolt setup and the standard centrifugal advance mechanism is retained, I'd fit the points box 'horizontally' with the points gap correctly set, turn the points cam assembly until the points are just opening, then lock it off with the expander... ken Its the upper hole!!! lower hole is 45 degrees tdc...
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Russell wrote: Hi Geo,
you've been one of the sites biggest attractions in recent years.
Russ
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| July 5th, 2012, 9:37 pm |
 
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: Visa TDC Ipgo, there's a difference between 'low speed' and 'lower'...  ken lpgo wrote: ken wrote: Since a Visa 652 starter ring has 131 teeth, the engine needs to be turned anticlockwise (131 x 10)/360 teeth from TDC to be set at 10* BTDC. ( That's 3.64 teeth. ) If you've still got the Visa gearbox or bellhousing to hand and offer up the engine to it, the flywheel stud should then be directly under the low speed sensor hole. I don't know how this points cam is fixed to the Visa camshaft, but if it's the usual expanding bolt setup and the standard centrifugal advance mechanism is retained, I'd fit the points box 'horizontally' with the points gap correctly set, turn the points cam assembly until the points are just opening, then lock it off with the expander... ken Its the upper hole!!! lower hole is 45 degrees tdc...
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| July 5th, 2012, 9:41 pm |
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lpgo
Firing on 1-2 Spark
Joined: November 8th, 2009, 5:42 pm
Posts: 2847
Location: NL
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Re: Visa TDC bottom ?!@#!? I will never learn decent English sorry....
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Russell wrote: Hi Geo,
you've been one of the sites biggest attractions in recent years.
Russ
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| July 5th, 2012, 9:45 pm |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: Visa TDC Fitted clutch housing but to no avail. I'm still way off the TDC mark. I have 7-8 teeth between them, should be 3,6 teeth. What the f...k is wrong Once fitted no change
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| July 5th, 2012, 10:04 pm |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: Visa TDC When does the sensor kick in, when aligned or just overlapping? I don't have any to fit for testing.
Bugger this drives me mad.
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| July 5th, 2012, 10:54 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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Re: Visa TDC your not doing something stupid like changing the piston stop from side to side for the turning back bit?
dont mark the teeth mark the plain bit and use dividers, calipers bits of wire or whatever to find the centre of the two marks- its too easy to loose a couple of degrees choosing the tooth nearest the datum
trouble is with the peg where is the 10*at the start, the middle or the end?
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Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| July 5th, 2012, 10:57 pm |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: Visa TDC I'm not sure what you mean Sean. The rod stays on the same side, I turn the crank shaft until the piston hits it. Mark the tooth where the pointer is, turn the crank shaft the other way until piston hit it again and place the second mark. Do this several times, everyttime getting 25 teeth. I mark the middle tooth leaving 12 teeth on either side. I can't for the life of me see how this could be wrong but nevertheless I get 7-8 teeth from the sensor pin and I should get 3,6. I can't work it out.
When all done, I start again but on the other cylinder to see the variation same result except only half a tooth between the 2 sides.
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| July 5th, 2012, 11:11 pm |
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lpgo
Firing on 1-2 Spark
Joined: November 8th, 2009, 5:42 pm
Posts: 2847
Location: NL
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Re: Visa TDC 2CViking wrote: When does the sensor kick in, when aligned or just overlapping? I don't have any to fit for testing.
Bugger this drives me mad. I will check it for you;....... but it will be tomorrow evening (sorry) I'm just bringing myself to bed right now... But I think it isn't that tricky. when your points are 0.45mm insted of 0.4mm you are also maybee of 1 degree (never tested it so) Your engine will never have the full power on points (at least at iddle) sorry to tell that but thats the truth, by "folding" the counter plates you can adjust advance at max rpm so that will be good. But the advance curve which the points will make is crap.... My (electronic ignition ) (sorry didn't want to mention it) engines have 20 degrees advance at 800 rpm making much more torque but on normal point you never can't do that........ The only thing you need 8 or 10 advance degrees is for starting the engine at 500 rpm it can already be (much) higher..........
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Russell wrote: Hi Geo,
you've been one of the sites biggest attractions in recent years.
Russ
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| July 5th, 2012, 11:14 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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Re: Visa TDC 2CViking wrote: I'm not sure what you mean Sean. The rod stays on the same side, I turn the crank shaft until the piston hits it. Mark the tooth where the pointer is, turn the crank shaft the other way until piston hit it again and place the second mark. Do this several times, everyttime getting 25 teeth. I mark the middle tooth leaving 12 teeth on either side. I can't for the life of me see how this could be wrong but nevertheless I get 7-8 teeth from the sensor pin and I should get 3,6. I can't work it out.
When all done, I start again but on the other cylinder to see the variation same result except only half a tooth between the 2 sides. your marks will be correct then the sensor will sense when the pin has past the mark? have you counted the teeth its not had an M28 starter ring fitted has it?
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Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| July 6th, 2012, 12:05 am |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: Visa TDC Viking,
are you sure you're not confusing one of the 'stop' marks with the TDC mark?
In that last set of photographs, second picture, is there a (Tippex) mark hidden to the right of the pointer?
ken
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| July 6th, 2012, 1:14 am |
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