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Dia. 70 pistons
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1281
Location: Barnsley S. Yorks

PostPosted: Sun Mar 15, 2020 6:09 pm    Post subject: Dia. 70 pistons Reply with quote

I've just acquired a set of 4 pistons and wet liners for an engine with 70.00 (2.75") bore. New old stock. One oil ring missing but otherwise ok. Been in store a bit so just a little surface rust. Anyone know what they belong to and anyone need them?
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peter scott



Joined: 18 Dec 2007
Posts: 7113
Location: Edinburgh

PostPosted: Mon Mar 16, 2020 1:21 pm    Post subject: Reply with quote

Aveling & Barford BXBA 70mm dia pistons
Fiat 11.9 hp 1933/34 69mm
Jaguar ss2 1608cc 69.5mm
Lea Francis 11.9hp 1926/32 69mm
MG12hp 1.5litre 1936/37 69mm
Morris 12/4 1936/48 1550cc 69.5mm
Renault 12hp 1934/40 70mm
Rover 12 1934/47 69mm
Rover 60 1948/49 69.5 mm
Standard 12hp 1934/48 69.5mm
Vauxhall 12hp 12/4 & Wyvern 1939/52 69.5mm

I suspect it will be the 1608cc Standard / Jaguar engine.

Peter
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1939 SS Jaguar 2 1/2 litre saloon
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1281
Location: Barnsley S. Yorks

PostPosted: Mon Mar 16, 2020 5:39 pm    Post subject: Reply with quote

Peter, you are a marvel, all I could find were motorcycles with 70mm pistons. These appear new. If they are Jag then they are +020 ish. I will research!
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peter scott



Joined: 18 Dec 2007
Posts: 7113
Location: Edinburgh

PostPosted: Mon Mar 16, 2020 8:19 pm    Post subject: Reply with quote

Hi Paul,

If you could give me the length I might be able to narrow it further.

Peter
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1939 SS Jaguar 2 1/2 litre saloon
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1281
Location: Barnsley S. Yorks

PostPosted: Tue Mar 17, 2020 11:55 am    Post subject: Reply with quote

Pistons are approx 68 mm longat the longest point but the skirt is shorter below the pin (approx 60mm at the shortest point) Pistons have a comprssion height of approx40mm. Liners are 130mm total length with approx 40mm spiggot to locate in the crankcase. Liners have an 85mm diameter flange at the top with a flat on just one side.
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peter scott



Joined: 18 Dec 2007
Posts: 7113
Location: Edinburgh

PostPosted: Tue Mar 17, 2020 3:20 pm    Post subject: Reply with quote

Hi Paul,

The Wellworthy book that I'm looking at has 3 7/64" i.e. 79 mm for the Standard 12hp piston length and compression height 1 35/64" i.e. 39 mm so maybe not that one.

All the cars have about the same length but the Aveling & Barford Motor Rollers have a length of 2 11/16" i.e. about 68 mm.

The models quoted are the BXBA and BG and BK

They have a flat head shape and compression height of 1 5/16" i.e 33 mm
The pin diameter is 5/8" i.e.15.875 mm

The BXBA have 3 rings of 3/32" thickness and 1 of 5/32" thickness.
the BG & BK have 2 rings 3/32" and 1 of 5/32"

The liners are 7 1/4" long and 2 7/8" outside diameter.

Your 130 mm long liners are very short. The only things with 70 mm bore and that sort of liner length that I can find are single cylinder motor bikes.
The Ariel Square 4 has too small a bore.

Peter
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1939 SS Jaguar 2 1/2 litre saloon
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1733
Location: Above the snow line in old Monmouthshire

PostPosted: Tue Mar 17, 2020 4:57 pm    Post subject: Reply with quote

It's not impossible that these pistons and liners are, although they appear to belong together, for different engines and have simply been "thrown together" in storage...
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PAUL BEAUMONT



Joined: 27 Nov 2007
Posts: 1281
Location: Barnsley S. Yorks

PostPosted: Mon Mar 30, 2020 5:51 pm    Post subject: Reply with quote

Back to this again! I am pretty certain that they belong together. Currently thoughts are turning to a Renault 1100 engine but who knows. When I get a chance I'll do more research.
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