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Re: T100R pinking bad - advice? #141311 05/15/08 10:58 am
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gs750 Offline
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RF,

Forgive me, but these are British Bikes, so they PINK, not ping.

http://en.wikipedia.org/wiki/Engine_knocking

:p


1971 Triumph T100C
1974 Honda XL350
1982 Suzuki GS750T
2000 Honda VFR800FI
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Re: T100R pinking bad - advice? #141312 05/15/08 11:22 am
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dave jones Offline
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RF Whatley- He has said that he has a T100R, you nit picker!
Oh yes, and as gs750 says, it is called pinking in the UK, you giant homophobe!

Dave

Re: T100R pinking bad - advice? #141313 05/15/08 1:06 pm
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John Healy Online Content
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"We are all ASSUMING you have a unit twin, but the dual crank hole for the timing tool wasn't used until about 1968. Before that, there was only 1 hole and that was TDC."

And if the rotor's timing mark aligns when the timing tool engages the TDC hole he is in trouble.

Richard: If he was clever enough to strobe his pre-war 500 I don't think he would be asking these questions.

Now, "working on mysteries without any clues" seems to be the norm in these situations.


Re: T100R pinking bad - advice? #141314 05/15/08 6:45 pm
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rockersj Offline OP
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It's a 1971 T100R.

The mechanic at Raber's who strobed it for me knows what he's doing (yes, he's is over 50).

This issue started before I replace electrical equipment.

I will retard the timing a couple of degrees and see what happens.


McQueen
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Re: T100R pinking bad - advice? #141315 05/17/08 11:17 pm
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Detour Rd Offline
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You wouldnt believe it. Just today on a ride, motor running great, it tightened up. Turned around headed home on full choke. Alwys ran the same brand of gas, carbs hed been set up years ago. Now I have to dump the gas and trouble shoot the carbs. My guess is the formula, here in Jersey, has been changed again. Ethenol-garbage.

Re: T100R pinking bad - advice? #141316 05/18/08 3:10 am
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EWebster Offline
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Backing the timing back a bit sounds like a fine idea.


Quote
The correct term is "pinging", aka "spark knock", technically known as "pre-ignition".
I am afraid a couple of our dear residents need to review of the difference between detonation and pre-ignition. Calling detonation and pre-ignition the same thing is much worse than saying "Motor" when you mean "Engine" :rolleyes: . I believe smoothing sharp edges and such would be more like toughening against pre-ignition than detonation. WWCS? (What Would Cameron Say?) Detonate long enough and pre-ignition will follow. Would this be auto-ignition in the UK?

Re: T100R pinking bad - advice? #141317 05/18/08 6:05 am
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Florida TR6 Offline
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Quote
I am afraid a couple of our dear residents need to review of the difference between detonation and pre-ignition
I didn't understand the difference so I looked it up and found a pretty good web site that describes both terms in detail. Site also contains some good information on possible causes, most of which have been already been listed in earlier posts. A good read.
web page


"For every problem, there is a solution that is simple, neat, and wrong." H.L.MENCKEN
'06 T100 Bonneville
'70 TR6 Bitsa, Pazon EI
Re: T100R pinking bad - advice? #141318 05/18/08 9:05 am
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Tiger Offline
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Bloody RFW and his politically inappropriate comments again ?
Get with the programme Richard, if you discriminate you have only 50% of availabe folks that you can root frown


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: T100R pinking bad - advice? #141319 05/18/08 2:16 pm
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John Healy Online Content
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The line between detonation and pre-ignition can be very fine indeed. The resultant increase in cylinder temperature caused by detonation, with its symptoms of pinking (UK), pinging RF & US) and knocking, can lead directly to pre-ignition.

So "WWCS? (What Would Cameron Say?) Detonate long enough and pre-ignition will follow."

http://www.contactmagazine.com/Issue54/EngineBasics.html

This is the best article I have come across to explain detonation and pre-ignition and the damage each will cause
.
Be sure to read the last paragraph "Muddy Water."

So while thickening the exhast valve margin, radiusing the edges of piston valve pockets, increasing the width of the valve's seat area, insuring the copper head gasket isn't sticking into the cylinder bore after a rebore, or installing proper grade spark plug, etc. might not prevent damage induced by detonation; it can help prevent detonation induced pre-ignition.


Re: T100R pinking bad - advice? #141320 05/18/08 11:49 pm
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Ginge Offline
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Rocker,

My bike did this ('71 T100C), until I replaced the head with one that wasn't cracked around the exhaust valves.

Do a compression check...

Sorry.


'51 C11 in a '54 C10L frame. Back on the road...
'70 Triumph Trophy 500. Next on the bench for a refresh!
'72 Triumph Tiger 650. Back on the road...
Re: T100R pinking bad - advice? #141321 05/19/08 12:14 am
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EWebster Offline
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WWCS meant What Would Cameron (as in Kevin the writer)Say. I would bet he has written quite a bit on the subject or most likely could as it pertains to our MC engines. Mr. Healy is right about high octane can cure many ills in this department.

Re: T100R pinking bad - advice? #141322 05/19/08 8:36 am
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dave jones Offline
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I still say that as it started doing it straight after some work on the charging system that it must have something to do with the electrics making the Boyer do that low voltage advance type thing.

dave

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