johny Posted March 24, 2023 Report Share Posted March 24, 2023 Look at this lovely Gloria engine - even in 1938 Triumph were using a crossflow design and then later on for our models went back to the older technology, why!!! 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 24, 2023 Report Share Posted March 24, 2023 meddlers and button counters had alot to do with the demise of great ideas from the past Pete Link to comment Share on other sites More sharing options...
Iain T Posted March 24, 2023 Report Share Posted March 24, 2023 I believe the first Bentleys had 4 valves per cylinder. Overhead cams all done in the same era by many including Wolseley. The 1930s Dolomite Roadster is a lovely looking car again with the crossflow engine? Iain Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 24, 2023 Report Share Posted March 24, 2023 Peugeot did a 16 valve 1.5ltr in the early 1920s just 1.5ltr and single cylinder from a distant talk on engines by Cosworth was the optimum is 5 per cyl 3 inlet 2 exhaust from memory there is a ratio of what diameter quantity is a best fit in the head /bore pete Link to comment Share on other sites More sharing options...
johny Posted March 24, 2023 Author Report Share Posted March 24, 2023 Cant imagine theres a great difference in production cost cross flow versus non (unless the head casting is a lot more complicated?) but I suppose Triumph as usual used whatever design they already had rather than start anew.... Link to comment Share on other sites More sharing options...
NonMember Posted March 24, 2023 Report Share Posted March 24, 2023 A cross-flow head will be more complicated to design, and probably to cast, especially for a push-rod engine. And if you really want the best advantage from it, you need the valves not to be in a single line - the TR7 engine has awkward exhaust porting because of the single cam. That makes a "proper" cross-flow, like the Sprint (or the Rover 2600 that was derived from it) quite a lot more expensive to produce. Post-war, when the Triumph SC engine was designed, it was worth it for Jaguar but not really for anyone else. (I don't know about Bentley but Skoda built engines with four valves per cylinder way back in the 1920s) Link to comment Share on other sites More sharing options...
johny Posted March 24, 2023 Author Report Share Posted March 24, 2023 oh dear, sounds like Triumph went down market after the Gloria days😭 Link to comment Share on other sites More sharing options...
Wagger Posted March 24, 2023 Report Share Posted March 24, 2023 Ricardo had much to do with the 4 valve head on the 1921 Triumph motorcycle. I forget when the cars and bikes separated into different companies. Link to comment Share on other sites More sharing options...
ahebron Posted March 26, 2023 Report Share Posted March 26, 2023 And when you lookup the Gloria Vitesse which like a good Vitesse has a 6 cylinder engine you will see it is a reverse flow engine (non crossflow) https://en.wikipedia.org/wiki/Reverse-flow_cylinder_head. I have been working on a DOHC twin carb 1100cc engine from the 1930s which puts out 50hp as standard. Not bad for those times. It is a big lump of an engine it was designed to be aluminium but due to the accounts dept was cast iron. Standard it came with a forward exiting head hugging hockey stick exhaust manifold similar to those fitted to the Stag. There was no reason I can see for this as the engine bay has plenty of room. It has been swapped out 4 into 1 headers. Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 26, 2023 Report Share Posted March 26, 2023 it always amazes me that when it goes bang the gas as any idea where to go but it does Pete Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now