S-T P4 cylinder dims.

Hi Nick, A chap at

information on several ST Engines. 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!

-------------------------------------------------------- More info sent off group. Mike.H.

Rcvd. with (much) interest, but not definative!

Interesting site. Thanks.

Unused +010 Alu P4 piston measures 2.755" which with due allowance for expansion gives a nominal standard bore as 2.750" ttfn Roland

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!

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

Could be. The engine went 4 years ago and my memory is not what it was :-) regards Roland

So what was it then? :-)

Jack > Could be. The engine went 4 years ago and my memory is not what it was :-) > regards

I think it must have been a P5 marine :-) ttfn Roland

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

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.