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Best A10 oil pump
#820581 08/19/20 11:17 pm
Joined: Oct 2012
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knuckle head
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knuckle head
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Best as in BSA made ,not the very expensive aftermarket pumps. What I see are what looks like brass/bronze, die cast
gray soft metal or cast iron? The pump I have appears to be the gray die cast metal. Assuming they are all in good condition ....
What would you use? Thanks


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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Re: Best A10 oil pump
Hillbilly bike #820583 08/19/20 11:35 pm
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As far as i know Tony, all the beezer made a10 pumps were mazak.
Some UK shops did make iron bodies but that was long ago.

Re: Best A10 oil pump
Hillbilly bike #820602 08/20/20 2:04 am
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Strange ---all the problems supposedly experienced by the old standard Mazak oil pumps on A65s whereas the A10 oil pumps---made out of similar monkey metal did not seem to give anything like the same scale of problems.
Or---maybe that is just my perception?

Re: Best A10 oil pump
Hillbilly bike #820605 08/20/20 2:46 am
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I think that you have the choices of original BSA (Mazak), new SRM (alloy alum.) or the new Hepolite iron pumps. I am going with an original BSA pump in my rat bike A10 plunger. Mickey Peters built my RGS power train through a friend and I haven't seen it or talked to him about it yet. I know that Kyle at Classic British Spares (a site sponsor) has been selling the Hepolites and may have some insight there.

I am pretty confident that you are more knowledgeable and more experience than me and can decide for yourself. I also think that it is to a certain degree a matter of "horses for courses" and I am confident that the original will work fine for my plunger. I am equally fine that anything Mickey used for the RGS will be up to snuff. If I were going racing, I suspect I would lean towards the SRM, the Hepolite being a newer commodity and less experience with it.

DJinCA

Re: Best A10 oil pump
Hillbilly bike #820608 08/20/20 4:47 am
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People didn't fret about oil pressure so much back then,
i used to thrash the living daylights out of my super rocket
and never had a worry about oil pressure, never checked it.
The standard pump, if rebuilt properly is fine, it may not give
the 10psi/1000rpm everyone talks about, but will suffice.

You could always do an end-feed conversion with a needle race
if you are worried about the pump, that way it only needs about
2/3 of it's capacity. Not that difficult to do on an A10.

Last edited by NickL; 08/20/20 4:59 am.
Re: Best A10 oil pump
Hillbilly bike #820631 08/20/20 11:45 am
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knuckle head
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I build an A10 about 20 years ago...After having discussions on this site, many talked about the oil pressure fading away after the bike was ridden for awhile. I was told to find a cast iron pump...I found one on eBay...Drilled and tapped the crankcase for a fitting and gauge. The engine had at least 45 psi at normal road speeds. Of course the fit of the timing side Bush and rods affects oil pressue
Ok, will use the zinc oil pump....I trust you guys......


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
Re: Best A10 oil pump
Hillbilly bike #820633 08/20/20 11:56 am
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Question, what are the differences between the A10 and A65 pumps? They look very similar.

Re: Best A10 oil pump
DMadigan #820644 08/20/20 2:03 pm
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Originally Posted by DMadigan
Question, what are the differences between the A10 and A65 pumps? They look very similar.
The drive gear on the A10 pump is on the inboard side, A65 the outboard side


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Re: Best A10 oil pump
Hillbilly bike #820646 08/20/20 2:47 pm
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knuckle head
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Info from the A10 forum,scroll down for comparison photos...

https://www.a7a10.net/forum/index.php?topic=5829.0


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
Re: Best A10 oil pump
Hillbilly bike #820675 08/20/20 7:25 pm
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So, the worm drive is on the lower (closer to mounting face) gears and turns the opposite direction. That means both pumps internally turn the same direction.
Interesting they would bother to make the gear pair a different number of teeth to make a hunting tooth on the early pumps. You cannot get better lubrication than in a pump.

Re: Best A10 oil pump
Hillbilly bike #820709 08/20/20 11:51 pm
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K
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Both pumps turn in the same direction, how could they not deliver in similar ways.
I think the mis-match of the gears was pointed out by chaterlea as incorrect.
To the eye they are a bad fit "mechanical marmalade" as he describes it. I don't think its intended to be hunting tooth at all.

Re: Best A10 oil pump
Hillbilly bike #820732 08/21/20 5:59 am
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Interesting to see that pump by Stuart Digby, he was the one to beat on an a65 outfit,
not many triples could manage it, even the 970 ones.

Re: Best A10 oil pump
Hillbilly bike #820782 08/21/20 10:56 pm
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HI All,
That photo on the A10 forum with the "odd" gears is an example of different year pump gears being mixed up
All BSA pumps should have gears with equal number of teeth on each
In the mid fifties they reduced the number of gear teeth to increase the output of the pump
Less teeth = more oil as the oil spaces between the teeth are bigger

John


Moderated by  Allan G, Jon W. Whitley 

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