Stellaghost Posted September 10 Author Share Posted September 10 Head done regards Stephen 2 Quote Link to comment Share on other sites More sharing options...
Bigj66 Posted September 10 Share Posted September 10 On 9/4/2024 at 4:32 PM, Stellaghost said: Hmmmm I think you are biased, your more desperate than I am to get the 200 out........lol Regards Stephen @Bowie69 are you thinking of replacing the V8 with a TDi in LGT? 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted September 10 Share Posted September 10 44 minutes ago, Bigj66 said: @Bowie69 are you thinking of replacing the V8 with a TDi in LGT? Err, no. 1 Quote Link to comment Share on other sites More sharing options...
Snagger Posted September 11 Share Posted September 11 That came out brilliantly. 1 Quote Link to comment Share on other sites More sharing options...
Nonimouse Posted September 11 Share Posted September 11 Can I suggest you port it? Polish the inlets and swirl the exhausts Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted September 11 Author Share Posted September 11 1 hour ago, Nonimouse said: Can I suggest you port it? Polish the inlets and swirl the exhausts Understand the polishing bit, never heard of swirling the exhausts Also this might not be necessary as I'm fitting a 1uz Regards Stephen 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted September 11 Share Posted September 11 25 minutes ago, Stellaghost said: Also this might not be necessary as I'm fitting a 1uz Correct answer. 😁 1 Quote Link to comment Share on other sites More sharing options...
Nonimouse Posted September 12 Share Posted September 12 10 hours ago, Stellaghost said: Understand the polishing bit, never heard of swirling the exhausts Also this might not be necessary as I'm fitting a 1uz Regards Stephen On Petrol's you polish the exhausts and swirl the inlet and visa versa on Diesels. It helps improve the mix and improve the exhaust flow on both types 1UZ is a nice engine Quote Link to comment Share on other sites More sharing options...
Ed Poore Posted September 12 Share Posted September 12 5 minutes ago, Nonimouse said: On Petrol's you polish the exhausts and swirl the inlet and visa versa on Diesels. It helps improve the mix and improve the exhaust flow on both types 1UZ is a nice engine Is that true for supercharged petrol engines too? My simplistic understanding on supercharged engines such is common on diesels the main thing is to get the exhaust flow out at quickly as possible with no back pressure unlike in NA petrol engines which require a bit of back pressure to setup scavenging in the plenums. 1 Quote Link to comment Share on other sites More sharing options...
Nonimouse Posted September 12 Share Posted September 12 1 hour ago, Ed Poore said: Is that true for supercharged petrol engines too? My simplistic understanding on supercharged engines such is common on diesels the main thing is to get the exhaust flow out at quickly as possible with no back pressure unlike in NA petrol engines which require a bit of back pressure to setup scavenging in the plenums. I'm reading up on the new generation of superchargers that the Muricans are developing. Some quite interesting stuff is being brought onto the market. For example, electronically managed engines with a supercharger don't want too much flow, it has to be balanced, whereas in the good old days you wanted the most flow physically possible then jetted the carbs to suit Quote Link to comment Share on other sites More sharing options...
Snagger Posted September 12 Share Posted September 12 2 hours ago, Ed Poore said: Is that true for supercharged petrol engines too? My simplistic understanding on supercharged engines such is common on diesels the main thing is to get the exhaust flow out at quickly as possible with no back pressure unlike in NA petrol engines which require a bit of back pressure to setup scavenging in the plenums. Pretty much. That was why old petrols and NA diesels had relatively narrow exhausts, and running a bigger exhaust would lead to reduced torque. It was about increasing velocity through a smaller bore to reduce pressure, using the exhaust as a Venturi tube to encourage scavenging of the cylinders. Turbo chargers will use the combination of pressure and kinetic energy a bit more flexibly, but once that energy is expended in the turbine, you want a larger exhaust to handle the greater mass of gas (compared to normally aspirated) and you don’t want any more restrictions as the energy left in the gas is too low to get any scavenging effect from. 1 Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted September 14 Author Share Posted September 14 Valves ground in and fitted to head, just need to finish nights so I can crack on Bit monotonous this bit valves looking good regards Stephen 3 Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted September 20 Author Share Posted September 20 A small but essential repair on the turbo A cut down clevis pon with a slitting disc groove cut into it for an e clip Pin.welded on e clip fitted and sorted regards Stephen 3 Quote Link to comment Share on other sites More sharing options...
Popular Post Stellaghost Posted Monday at 04:01 PM Author Popular Post Share Posted Monday at 04:01 PM Just to close this out, engine now running and smoke free, sounds like one of the tappets needs some mild adjustment, but other than that I'm very happy Regards Stephen 9 Quote Link to comment Share on other sites More sharing options...
steve200TDi Posted Wednesday at 08:55 AM Share Posted Wednesday at 08:55 AM On 9/14/2024 at 3:13 PM, Stellaghost said: Valves ground in and fitted to head, just need to finish nights so I can crack on Bit monotonous this bit valves looking good regards Stephen Count yourself lucky you only have 8 valves! I've rebuilt V12 engines in the past with 4 valves per cylinder! I had to lap in 48 valves, luckily it had hydraulic lifters, so I didn't need to adjust all the tappets! Steve Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted Wednesday at 09:59 AM Share Posted Wednesday at 09:59 AM 1 hour ago, steve200TDi said: Count yourself lucky you only have 8 valves! I've rebuilt V12 engines in the past with 4 valves per cylinder! I had to lap in 48 valves, luckily it had hydraulic lifters, so I didn't need to adjust all the tappets! Steve Could be worse, could be shim/bucket tappets..... nightmare. 2 1 Quote Link to comment Share on other sites More sharing options...
steve200TDi Posted Wednesday at 10:34 AM Share Posted Wednesday at 10:34 AM 34 minutes ago, Bowie69 said: Could be worse, could be shim/bucket tappets..... nightmare. Yes, that's also a nightmare with torqueing the cam down measuring and then removing the cam and swapping out the tappets! Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted Wednesday at 10:35 AM Share Posted Wednesday at 10:35 AM Just now, steve200TDi said: Yes, that's also a nightmare with torqueing the cam down measuring and then removing the cam and swapping out the tappets! ...and trying to work out which tappets can be used elsewhere and how many shims you need to buy from the main stealers...... 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted Wednesday at 10:39 AM Share Posted Wednesday at 10:39 AM There's something to be said for hydraulic tappets. 1 Quote Link to comment Share on other sites More sharing options...
bishbosh Posted Wednesday at 03:19 PM Share Posted Wednesday at 03:19 PM 6 hours ago, steve200TDi said: Count yourself lucky you only have 8 valves! I've rebuilt V12 engines in the past with 4 valves per cylinder! I had to lap in 48 valves, luckily it had hydraulic lifters, so I didn't need to adjust all the tappets! Steve [4 Yorkshiremen mode] You were lucky......... [/4 Yorkshiremen] Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted Wednesday at 04:36 PM Author Share Posted Wednesday at 04:36 PM 7 hours ago, steve200TDi said: Count yourself lucky you only have 8 valves! I've rebuilt V12 engines in the past with 4 valves per cylinder! I had to lap in 48 valves, luckily it had hydraulic lifters, so I didn't need to adjust all the tappets! Steve Ahh, but then I would build a valve lapping machine to make the job less onerous........ Regards Stephen 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted Wednesday at 04:40 PM Share Posted Wednesday at 04:40 PM 3 minutes ago, Stellaghost said: Ahh, but then I would build a valve lapping machine to make the job less onerous........ Regards Stephen You mean you don't have one? Sheesh, what is the world coming to. 2 Quote Link to comment Share on other sites More sharing options...
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