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Author Topic: +80 pistons  (Read 2849 times)

Offline pato08

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Re: +80 pistons
« Reply #15 on: 11.09. 2016 01:12 »
(So many possibilities with too many differences. Pin size, crown height etc. Now that I have nice new R&R rods I don't want anything chewing on those.)
Hi Musky, can you tell me a bit more about the " R&R" rods. 
Thanks
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Offline muskrat

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Re: +80 pistons
« Reply #16 on: 11.09. 2016 10:31 »
G'day Pato. Their too beautiful to hide inside a motor. I got them from Fecked http://www.feked.com/bsa-a10-1959-63-connecting-rod.html . I should have weighed them but they felt pretty close. The little end pin runs direct in the rod (no bush) and the bolts are done up to 50ft/lb. For the large journal crank.
Cheers
































































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Offline chaterlea25

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Re: +80 pistons
« Reply #17 on: 11.09. 2016 16:14 »
Hi Muskie,
Those rods look very similar to the MAP rods I bought for my RGS
Theres a sequence for tightening the ARP bolts and checking the bolt stretch on each tighteniong
Did the y send the ARP bolt lube?

Following on from the B31 suggestion, I have a 10:1 A10 +60? piston that has been machined at the bottom of the skirt to fit in a B31 (same pin size and comp height)
So the reverse should work? B31's are 71mm std so a +040 would equal A10 +80
Theres an earlier BSA Blue /silver star piston that offers a higher compression ratio than the flat topped B31
I'm pretty sure John Harding has some of these, send him  mail to , johnharding197@live.co.uk
or

JOHN HARDING
1 Flock cottage
Hope Mansell
Ross-on-Wye
Herefordshire
HR95TL
United Kingdom

Phone:01989 750731
Email:johnharding197@live.co.uk

John Has a big stock of NOS pistons and an encyclopedic knowledge of what fits what

HTH
John
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Offline Rocket Racer

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Re: +80 pistons
« Reply #18 on: 12.09. 2016 05:06 »
Much as it pains me to do so, I would be prepared to let you have these bare babies if you make me a reasonable offer. All my bores are still much smaller...

JP's   *evil*   dont' do it.

These are 10.5:1

At least rings are easy, triumf +40 ones as 650 triumfs have a mm bigger bore size
send me a pm  *wink2*
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Offline muskrat

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Re: +80 pistons
« Reply #19 on: 12.09. 2016 08:39 »
G'day RR.
That's a mighty fine offer mate and yes they'd be hard to let go. I have a set of +10 and +30 of those. They are a nice piston with offset pin.
JP's would be my last choice, haven't heard back from them yet. See how I go with John's suggestion.

G'day John. Thanks very much for that info. I'll give him a call. Yes a packet of lube in each box.
Cheers
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Offline Rocket Racer

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Re: +80 pistons
« Reply #20 on: 13.09. 2016 02:17 »
Quote from: muskrat on 12.09. 2016 08:39
G'day RR.
That's a mighty fine offer mate and yes they'd be hard to let go. I have a set of +10 and +30 of those. They are a nice piston with offset pin.
JP's would be my last choice, haven't heard back from them yet. See how I go with John's suggestion.

G'day John. Thanks very much for that info. I'll give him a call. Yes a packet of lube in each box.
Cheers

I can always do a straight swap for your set of bare +30 if that helps, I've got two motors on +20 so I can see a set of +30 going onto Bender on its next strip.

Tim
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Offline muskrat

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Re: +80 pistons
« Reply #21 on: 13.09. 2016 13:37 »
G'day RR.
My +30's had done about 100 road miles, rings still at original gap.
PM sent.
Cheers
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Offline Rocket Racer

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Re: +80 pistons
« Reply #22 on: 11.10. 2016 08:34 »
I look forward to seeing a picture of those +80's in the motor before the head goes on  *dribble*
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A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
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Offline chaterlea25

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Re: +80 pistons
« Reply #23 on: 11.10. 2016 12:38 »
Hi All,
Regarding  those high comp pistons,
At a show and jumble at the weekend a friend of mine had a set of "Powermax" 10:1 std bore for sale
I can arrange contact if anyone is interested

John
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