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knuckle head
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knuckle head
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It often sits for a month and the oil level in the tank stays the same..
The engine has about 50 psi pressure at 3000 rpm and 20 at idle warmed up with 20/50..
Is the non wet sump situation due to the carefully fitted stock ball check next to the main bush or the original but decent condition oil pump.?


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
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Is the non wet sump situation due to the carefully fitted stock ball check next to the main bush or the original but decent condition oil pump.?

- yes

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Must have a good non leaky oil pump as well.

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The oil pump gods are smiling on you.

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knuckle head
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knuckle head
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So the ball check valve alone is not enough tp prevent wet sumping?


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
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The leaks often start before the check valve, usually the oil pump bottom plates, upper body, through the drive spindle, additionally, oil can seep from the high-pressure gears through to the scavenge gears.

Not only that but there may be leaks between the crankcase and the pump body.

Sounds like you've got a good one of its not leaking, either that or you're using extra-thick oil.

Make sure oil is actually returning to the tank in good quantities as it could be the supply side is somehow compromised despite the decent pressure.


1968 A65 Firebird
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I say that HB deserves a "golden attaboy" for building an A10 that doesn't wet sump. That's not so easy an accomplishment.
The anti-sumping check ball and seat need to be perfect, the pump needs to be tight internally or machined for o-rings and you can't have leaks at the gasket.

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Both of my A65s wetsumped for around forty years until I fitted a cast iron pump from a '71, and I had tried the check ball remedies of lapping and spring replacement. Now, no wetsumping, even all winter.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
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YOU ARE EITHER VERY LUCKY OR YOU HAVE NOT CHECKED YOUR OIL.


I APOLOGIZE FOR THE USE OF CAPS. I CAN ONLY TYPE WITH MY RIGHT HAND SO USING THE SHIFT KEY IS BEYOND MY CAPABILITES.

The Devil is in the details.

1957 BSA A10 Spitfire Scrambler (numbers matching, very correct, very nice condition)
1965 BSA A65 Lightning Rocket "Clubman" (restored)
1966 BSA A65 Spitfire MK-II (restored)
1967 BSA A65 West Coast Hornet (under restoration)
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Originally Posted by Mark Z
Both of my A65s wetsumped for around forty years until I fitted a cast iron pump from a '71, and I had tried the check ball remedies of lapping and spring replacement. Now, no wetsumping, even all winter.

Iron pumps should be lapped, mazak pumps should have a new ball tapped against the seat to re-form the sealing face (then discarded and another new ball and spring fitted to the motor). That might have solved the issue, The Iron pumps were inherantly better though in all aspects.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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knuckle head
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Originally Posted by Spitfire Ken
YOU ARE EITHER VERY LUCKY OR YOU HAVE NOT CHECKED YOUR OIL.
And you didn't read my original post...


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"

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