S-T P4 cylinder dims.

As part of trying to understand the evolution of Stuart Turner's small
two-stroke range, I have been compiling a list of cylinder dimensions (bore
and stroke). At the moment I am stumped on the P4 - the catalogue page which
Mike H was kind enough to email me unusually does not give this
information - can anyone help?
TIA
Reply to
Nick H
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Hi Nick, A chap at
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information on several ST Engines. Dave Croft
Reply to
Dave Croft
Seek and thou shalt find.
And on my own book shelves to! A penny booklet from S-T dated 1938 gives P4 dims as 2 3/8" x 2 3/4", confirming what Mike H sent me (that had dims but didn't actually state engine type).
sorry to have bothered you chaps, but it was a bit quiet!
Reply to
Nick H
-------------------------------------------------------- More info sent off group. Mike.H.
Reply to
Mike.H
Rcvd. with (much) interest, but not definative!
Reply to
Nick H
Unused +010 Alu P4 piston measures 2.755" which with due allowance for expansion gives a nominal standard bore as 2.750" ttfn Roland
Reply to
Roland and Celia Craven
Sure it's not P5 or P6 (2 3/4" x 2 3/4")? I'm pretty certain P4 was smaller than that - I just don't know how much smaller!
Reply to
Nick H
Story so far:-
1/2 hp vertical kit (1906) 2 1/8 x 2 1/2 ; 1/2 hp @???; two port? P3 (1919) 2 1/4 x 2 1/2; 1hp @ 1100-1200rpm P4 (1928) ? x ?; 1hp @ 1000rpm 1 1/2hp @ 1200rpm N (????) 1 3/4 x 2; 2/3hp @???? P5 (????) 2 3/4 x 2; 3/4 up to 4 hp in marine service R2 (193?) 1 3/4 x 2 1/8; 3/4 hp @1500rpm R3 (193?) 2 1/8 x 2 1/8; 1 1/2 hp @ 1500rpm P6 (????) 2 3/4 x 2; 3/4 up to 5hp in marine service
Reply to
Nick H
Could be. The engine went 4 years ago and my memory is not what it was :-) regards Roland
Reply to
Roland and Celia Craven
So what was it then? :-)
Jack in Oz ===========
Roland and Celia Craven wrote:
Reply to
Jack Watson
I think it must have been a P5 marine :-) ttfn Roland
Reply to
Roland and Celia Craven
Not forgetting the H type single cylinder diesel, which has a bore and stroke of 2 3/4 x 4 inches. 389 cc, giving up to 3 hp at 1500 rpm.
Regards
Philip T-E
Reply to
ClaraNET
Thanks for those dims Philip. I must admit that I hadn't considered this engine as part of the same family tree, but it is interesting to note that it shares a 2 3/4" bore with P5 onwards.
Reply to
Nick H

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