ohhhhhh shiney!!!
Discussion
That looks like an excellent piece of kit to create a rich running nail with flat spots...Welded bodged up manifolds rarely work...That one doesn't even look to have been welded level which will have an effect on float chambers...A390 Holley is still considered by many to be a big carb for a Rover V8 let alone a little boat anchor...Steer well clear on a mild essex your 38 DGAS is more than enough.
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heightswitch said:
That looks like an excellent piece of kit to create a rich running nail with flat spots...Welded bodged up manifolds rarely work...That one doesn't even look to have been welded level which will have an effect on float chambers...A390 Holley is still considered by many to be a big carb for a Rover V8 let alone a little boat anchor...Steer well clear on a mild essex your 38 DGAS is more than enough.
N
Much bully plops I,m afraid Neil. In its day when Ford Capris were winning every chamionship they entered Swaymar( Dave Martin) were the engine builders who built those race winning engines. The kit for sale here was the ultimate single carb installation and up to about 6500 rpm gave more power than triple carb set up. The whole point was to equalise the "inlet tract lengths" which were, along with the cam lift the weakness in the Essex. This design was not arrived at by accident, all mods were done by flow bench testing not grinding away willy nilly to make things shiny. Obviously they need to be used in conjunction with cams, heads etc so bolting onto a bog standard engine would be counter productive. The whole point of having different jet sizes overcomes your argument about richness in exactly the same way over jetted Webers will run rich.N
The reason the carb is mounted at a slight angle is to equalise the airflow and fuel distribution to all 6 cylinders, if you ever wondered what the "W" shaped bent bit of metal in you DGAS mainfold is for, its for much the same thing. take it out and see what happens! Unfortunately the kit for sale on ebay is not suitable for a TVR. There were 2 options, the one here was for a Capri/Granada/Scimitar which had more clearance under the bonnet, the TVR/Marcos manifold is much lower and is called the low plenum manifold and is in fact flat.
For those interested there was an excellent series of articles called "Joy of Six" written by David Vizard in Car and Car Conversions I think in period.
Edited by thegamekeeper on Thursday 10th May 11:13
thegamekeeper said:
Much bully plops I,m afraid Neil. In its day when Ford Capris were winning every chamionship they entered Swaymar( Dave Martin) were the engine builders who built those race winning engines. The kit for sale here was the ultimate single carb installation and up to about 6500 rpm gave more power than triple carb set up. The whole point was to equalise the "inlet tract lengths" which were, along with the cam lift the weakness in the Essex. This design was not arrived at by accident, all mods were done by flow bench testing not grinding away willy nilly to make things shiny. Obviously they need to be used in conjunction with cams, heads etc so bolting onto a bog standard engine would be counter productive. The whole point of having different jet sizes overcomes your argument about richness in exactly the same way over jetted Webers will run rich.
The reason the carb is mounted at a slight angle is to equalise the airflow and fuel distribution to all 6 cylinders, if you ever wondered what the "W" shaped bent bit of metal in you DGAS mainfold is for, its for much the same thing. take it out and see what happens! Unfortunately the kit for sale on ebay is not suitable for a TVR. There were 2 options, the one here was for a Capri/Granada/Scimitar which had more clearance under the bonnet, the TVR/Marcos manifold is much lower and is called the low plenum manifold and is in fact flat.
For those interested there was an excellent series of articles called "Joy of Six" written by David Vizard in Car and Car Conversions I think in period.
You hit the nail on the head...racing set up..My comments were limited to road set up and in particular on a std engine... However whether race or road the issues are still the same..It will effect floats and fuel delivery....which is why holleys can be specified with side or centre hung floats and secondary metering units..The reason the carb is mounted at a slight angle is to equalise the airflow and fuel distribution to all 6 cylinders, if you ever wondered what the "W" shaped bent bit of metal in you DGAS mainfold is for, its for much the same thing. take it out and see what happens! Unfortunately the kit for sale on ebay is not suitable for a TVR. There were 2 options, the one here was for a Capri/Granada/Scimitar which had more clearance under the bonnet, the TVR/Marcos manifold is much lower and is called the low plenum manifold and is in fact flat.
For those interested there was an excellent series of articles called "Joy of Six" written by David Vizard in Car and Car Conversions I think in period.
Edited by thegamekeeper on Thursday 10th May 11:13
if you wanted a high end racing set up running at 6000rpm all day fine...Holley on a std engine though..horrible.
I will go further to say that if it was so good then Swaymar wouldn't have saw fit to develop a triple downdraft conversion feeding exactly the right amount of air and fuel into each cylinder
N.
Edited by heightswitch on Thursday 10th May 14:02
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