featherbed-19-exhaust

Previously richard_cornish wrote:

Hi Tom,

The model 19 engine is 1.25 inches taller than an ES2. The reason for this is because the model 19 con-rod is 8 inches between centres and the ES2 is 7 inches plus the stroke is 13mm longer, half of whichis 6.5mm. Armours list a 19s front pipe but according to their website are out of stock at the moment. This pipe also fits well on 500cc garden-gate Inters. Regards, Richard.

Hi Richard.. i am a bit confused here. my-standard es2-engine has a 7"-CONROD. my standard mod-19s engine has a 7- 1/2" CONROD. i have a spare- 8"- CONROD _+CRANK which i think would be a 16h OR BIG 4.// IF I REMEMBER WELL I TRIED THE 8 "CON-ROD-CRANKSHAFT IN A STANDARD MOD 19S-ENGINE AND THE PISTON CAME OUT THE TOP OF THE BARRELL.. ARE YOU SURE THE 19S CRANK ISN'T 7-1/2".. [ NOT SURE BUT THINK THE SIDEVALVE CONRODS ARE LONGER].. THANKS. TOMMY.

Previously richard_cornish wrote:

Hi Tommy,

I have just been to check the pushrod tubes on both ES2 and model 19 which are a good indicator of the difference and they are 1.25 inch longer on the 19. This is on the engines with the Wellworthy type alloy head with the iron skull. As far as I am aware all 596cc singles including OHC used con-rods with 8" centres as the length is relative to the stroke. Do you know if your engine has been modified and fitted with a shorter rod or if you have the correct piston or whether the barrel has been shortened? The only con-rod that I know of that is 7.5" and has a 2" big-end bearing is the 1930 to 39 CS1 OHC engine. Your piston should have the dished/concave top but a pre-war Big 4 is similar but has a flat top and the compression height is .25 inch higher. Yes I think you are right about side-valves including 500cc 16H and I'm fairly sure they all use 8" rods. If you have any pics you could post would be good. Regards, Richard.

Hi. still think the mod 19s. has a 7- 1/2"conrod.. if an es2 has a 7" conrod.. with a 79 x100 stroke.. the mod 19s stroke is 113 mm .. 13mm is approx 1/2"inch =7" + 1/2"= 7-1/2".///.SO THE 19 COROD- HAS TO BE 13MM -LONGER THAN AN ES2-7"-ROD SURELY-IT HAS TO BE 7" +1/2" ==7-1/2".. i did have all this written down but can'f find it..[[ due to the shape of side-valve barrels i think there con-rods are longer. ????] my barrell and piston are all standard.. the cast head and alloy don't make any difference the piston crown stops at approx 7mm. from the top of liner.. the head bolts on an alloy -head pass right through the head- on a cast head they rest inside the head- about 2/3 fins up..my engine-is standard.. i'm trying to get spares of N.O.C.. but am having trouble trying to pay by pay-pal.. how do i add a photo to this page.. thanks tommy.

Previously richard_cornish wrote:

Hi Tommy,

I have just been to check the pushrod tubes on both ES2 and model 19 which are a good indicator of the difference and they are 1.25 inch longer on the 19. This is on the engines with the Wellworthy type alloy head with the iron skull. As far as I am aware all 596cc singles including OHC used con-rods with 8" centres as the length is relative to the stroke. Do you know if your engine has been modified and fitted with a shorter rod or if you have the correct piston or whether the barrel has been shortened? The only con-rod that I know of that is 7.5" and has a 2" big-end bearing is the 1930 to 39 CS1 OHC engine. Your piston should have the dished/concave top but a pre-war Big 4 is similar but has a flat top and the compression height is .25 inch higher. Yes I think you are right about side-valves including 500cc 16H and I'm fairly sure they all use 8" rods. If you have any pics you could post would be good. Regards, Richard.

HI.. I RANG A MOD 19-MAN AND IT IS A 7-1/2"-CONROD FOR A MOD-19.. AND 8" FOR THE SIDE-VALVE .. NOW I NEED TO GET A 7-1/2"CONROD FOR A SPARE -19S-CRANK I HAVE.. I ALSO HAVE GIVEN UP ON A MOD 19S-EXHAUST -DOWN-PIPE + CAM SHIMS.. THANKS TOMMY.