Engine Start Up

I have a 600 cubic inch 1925 Sterling Dolphin engine with 4 valves per cylinder and only 2 push rods per cylinder
K Clark

mikespeed35 wrote: I would like to see the valve train, I'm trying to imagine how they would run four valves per cyl. on one cam. The early Bug's ran three valves per cyl. but with two cams.
Cordially Mike

Hello Mike,

when you follow the (Old Motor) link that DavidK posted, you will find a "Vimeo" Video and when you stopp it @1.29 min. running time, you will have a good view to the valve train.

Here is the link to the video

vimeo.com/113158655

It looks like that there are three! tappets for each cylinder on the camshaft, so one pair of valves (intake or outlet?) will be pushed by a spread rocker lever.


Cheers

Matt

mikespeed35 wrote: I would like to see the valve train, I'm trying to imagine how they would run four valves per cyl. on one cam. The early Bug's ran three valves per cyl. but with two cams.
Cordially Mike

Hello Mike,

I don't know how it works in that engine. It is possilble that it works with "spreaded" rocker arms/lever -> one arm/lever moves both valve on the intake (or outlet) side. So (for a four cyl. engine) there is only one camshaft (with 8 tappets on it) needed.

An example (in a different type of engine) for spreaded rocker arms are the early Harley Davidson 8 Valve Racer OHV (not OHC) engines. Two valves are driven by one "spreaded" rocker lever -> one tappet (and pushrod)

Here you will find a picture:

commons.wikimedia.org/wiki/File : ... emphis.jpg


Cheers

Matt

I would like to see the valve train, I'm trying to imagine how they would run four valves per cyl. on one cam. The early Bug's ran three valves per cyl. but with two cams.
Cordially Mike

Here is another mad machine

BRUTUS powered by a 46.9 l V-12 BMW Warbird engine

mikespeed35 wrote: Is that a overhead cam engine? Looks like it might be.
Cordially Mike

Hello Mike,

according to the following link, that has an overhead camshaft and four valves per cylinder.

The displacement per cyl. is about 7.1 ltr (433 cui) <!-- s:shock: --><img src="{SMILIES_PATH}/icon_eek.gif" alt=":shock:" title="Shocked" /><!-- s:shock: -->

grrc.goodwood.com/festival-of-s ... at-s76-fos


Cheers

Matt

Is that a overhead cam engine? Looks like it might be.
Cordially Mike

Here's a great short video for Sunday Morning viewing.
theoldmotor.com/?p=133946