Dommie questions

fredful

fredful

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Jan 18, 2011
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Hi All Norton aficionados
Its been a while since I last posted to Access Norton but having recently started restoration on a 1957 Dominator 88 I have a few questions.
So where better to raise them than here!

Question 1. Were the dommies fitted with radiused cam followers as standard ? as they are installed on mine.

Question 2. There seems to be an alignment issue with the timing cover, I noticed that when I screwed the cover on the crank became tighter to turn over. After confirming that I had sufficient side play in the intermediate gear i removed the locating dowels before screwing the cover home again, this seems to have alleviated the problem. This was done with the head and barrels removed so as not to damage the casting where the intermediate gear pin is mounted.
Is it possible I have a mismatched timing cover??? How accurate were the dowel pins fitted in the day???

Any help is appreciated

Freddy.
 
The radius folowers were used in the early motors that did not have the Daytona cam with the quieting ramps ,these had the flat followers. Could be a later timing cover ,if the cam is pulling the chain and the spindle is off a bit?. cover seal not fully in? ,crank not bolted together with good fitting bolts and so not aligned properly?
 
I have 500, 600, and 650 engines.

1. I believe that the lifters were radiused until the 88SS/650SS cam lifters which were flat.
The one cam I have with QR on it (1957 99 or 1959 88) (don't know if it is a "daytona") I thought it had radiused lifters?? I'll have to check again and see.

2. Until at least engine 100321 1962 all my engine cases were marked with a matching 3 digit number stamped both in the engine timing chest and in the timing cover. After 50 years who knows what has been swapped around. I always use the two alignment dowels. Swapping that I have done, has caused no apparent problem.
 
dynodave said:
I have 500, 600, and 650 engines.

1. I believe that the lifters were radiused until the 88SS/650SS cam lifters which were flat.
The one cam I have with QR on it (1957 99 or 1959 88) (don't know if it is a "daytona") I thought it had radiused lifters?? I'll have to check again and see.

2. Until at least engine 100321 1962 all my engine cases were marked with a matching 3 digit number stamped both in the engine timing chest and in the timing cover. After 50 years who knows what has been swapped around. I always use the two alignment dowels. Swapping that I have done, has caused no apparent problem.
Click to expand...

My 1958 99 had a standard cam QR (Quietening Ramps) and flat lifters.
 
My 60 99 (built 59) and 61 88 both had the Daytona cam QR and flat followers from new ,they also had the ally pushrods. The QR cam has different timing to the SS cam which came later. The Daytona cam was used on the Std bikes which were still being sold when the 650 came in , The radius followers could be fitted with the later cam but it was not intended for that ,I think it would change the timing and shorten the duration .
 
Here in north america the pre commandos are much rarer than commando and data and information is hard to come by and I have no IPL from 1956 through 1960.
Is this cam which IIRC is the QR from my 1959 88 an early QR or a daytona QR? Yes it was flat lifters!
I posted it as a 21225, is this incorrect? Is the profile for an early or daytona cam?
Dommie questions


thanks
 
dynodave said:
I have 500, 600, and 650 engines.

1. I believe that the lifters were radiused until the 88SS/650SS cam lifters which were flat.
The one cam I have with QR on it (1957 99 or 1959 88) (don't know if it is a "daytona") I thought it had radiused lifters?? I'll have to check again and see.

2. Until at least engine 100321 1962 all my engine cases were marked with a matching 3 digit number stamped both in the engine timing chest and in the timing cover. After 50 years who knows what has been swapped around. I always use the two alignment dowels. Swapping that I have done, has caused no apparent problem.
Click to expand...

That explains the mystery number in the timing chamber but no corresponding number in the timing cover.
i am just looking at the pic and noticed the rubbing mark to the front of the intermediate gear spindle hole.

Now another question. Is there any way of ajusting the engagement of the dynamo drive gear, I noticed there is way too much backlash between the gear and the fibre driving gear?, I dont think this will survive very long how it is.

Thanks so much for sharing your knowledge Guy's this is really hepful.

Dommie questions
 
Your motor would have come from the factory with a std Daytona QR cam and flat followers, so its likely thats what you have. I do have (somewhere!) the timings for this cam which needs 3 and 5thou cold clearance. The figures are different from the SS cam but not hugely so and the cam was used in bikes that won production races .
 
This is the plot for model 7 .264 lift probably with 3" radius, 88QR???.305" lift and SS/atlas .330" lift,
all I need is total cam lift to ID the missing QR cam and which one this is.
Dommie questions
 
You are hedging ?, these figures were taken without using the Norton cam followers. ?
So a comparison with figures/curves taken directly off the valve lifts would be tricky ??
rocker ratios included...

dynodave said:
This is the plot for model 7 .264 lift probably with 3" radius, 88QR???.305" lift and SS/atlas .330" lift,
all I need is total cam lift to ID the missing QR cam and which one this is.
http://atlanticgreen.com/images/cam101411.gif
Click to expand...
 
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